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regalloc: ensure we only freeze/unfreeze at the outermost scope

Browse source 
This prevents a nasty type of bugs where we accidentally unfreeze
a register that was frozen purposely in the outer scope, risking
accidental realloc of a taken register.

Fix CF flags spilling on aarch64 backend.
This commit is contained in:
Jakub Konka 2022-05-07 00:57:55 +02:00
parent ac1aaec9c3
commit ac954eb539
6 changed files with 735 additions and 413 deletions
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219
src/arch/aarch64/CodeGen.zig
View file

@ -23,6 +23,7 @@ const log = std.log.scoped(.codegen);
const build_options = @import("build_options");
const RegisterManagerFn = @import("../../register_manager.zig").RegisterManager;
const RegisterManager = RegisterManagerFn(Self, Register, &callee_preserved_regs);
const RegisterLock = RegisterManager.RegisterLock;
const GenerateSymbolError = @import("../../codegen.zig").GenerateSymbolError;
const FnResult = @import("../../codegen.zig").FnResult;
@ -910,16 +911,16 @@ pub fn spillInstruction(self: *Self, reg: Register, inst: Air.Inst.Index) !void
fn spillCompareFlagsIfOccupied(self: *Self) !void {
if (self.compare_flags_inst) |inst_to_save| {
const mcv = self.getResolvedInstValue(inst_to_save);
switch (mcv) {
const new_mcv = switch (mcv) {
.compare_flags_signed,
.compare_flags_unsigned,
=> try self.allocRegOrMem(inst_to_save, true),
.register_c_flag,
.register_v_flag,
=> {},
=> try self.allocRegOrMem(inst_to_save, false),
else => unreachable, // mcv doesn't occupy the compare flags
}
};
const new_mcv = try self.allocRegOrMem(inst_to_save, true);
try self.setRegOrMem(self.air.typeOfIndex(inst_to_save), new_mcv, mcv);
log.debug("spilling {d} to mcv {any}", .{ inst_to_save, new_mcv });
@ -927,6 +928,15 @@ fn spillCompareFlagsIfOccupied(self: *Self) !void {
try branch.inst_table.put(self.gpa, inst_to_save, new_mcv);
self.compare_flags_inst = null;
// TODO consolidate with register manager and spillInstruction
// this call should really belong in the register manager!
switch (mcv) {
.register_c_flag,
.register_v_flag,
=> |reg| self.register_manager.freeReg(reg),
else => {},
}
}
}
@ -1048,8 +1058,8 @@ fn trunc(
}
},
};
self.register_manager.freezeRegs(&.{operand_reg});
defer self.register_manager.unfreezeRegs(&.{operand_reg});
const lock = self.register_manager.freezeReg(operand_reg);
defer if (lock) |reg| self.register_manager.unfreezeReg(reg);
const dest_reg = if (maybe_inst) |inst| blk: {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
@ -1135,8 +1145,8 @@ fn airNot(self: *Self, inst: Air.Inst.Index) !void {
.register => |r| r,
else => try self.copyToTmpRegister(operand_ty, operand),
};
self.register_manager.freezeRegs(&.{op_reg});
defer self.register_manager.unfreezeRegs(&.{op_reg});
const reg_lock = self.register_manager.freezeRegAssumeUnused(op_reg);
defer self.register_manager.unfreezeReg(reg_lock);
const dest_reg = blk: {
if (operand == .register and self.reuseOperand(inst, ty_op.operand, 0, operand)) {
@ -1168,8 +1178,8 @@ fn airNot(self: *Self, inst: Air.Inst.Index) !void {
.register => |r| r,
else => try self.copyToTmpRegister(operand_ty, operand),
};
self.register_manager.freezeRegs(&.{op_reg});
defer self.register_manager.unfreezeRegs(&.{op_reg});
const reg_lock = self.register_manager.freezeRegAssumeUnused(op_reg);
defer self.register_manager.unfreezeReg(reg_lock);
const dest_reg = blk: {
if (operand == .register and self.reuseOperand(inst, ty_op.operand, 0, operand)) {
@ -1257,8 +1267,17 @@ fn binOpRegister(
const lhs_is_register = lhs == .register;
const rhs_is_register = rhs == .register;
if (lhs_is_register) self.register_manager.freezeRegs(&.{lhs.register});
if (rhs_is_register) self.register_manager.freezeRegs(&.{rhs.register});
const lhs_lock: ?RegisterLock = if (lhs_is_register)
self.register_manager.freezeReg(lhs.register)
else
null;
defer if (lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const rhs_lock: ?RegisterLock = if (rhs_is_register)
self.register_manager.freezeReg(rhs.register)
else
null;
defer if (rhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const branch = &self.branch_stack.items[self.branch_stack.items.len - 1];
@ -1270,13 +1289,13 @@ fn binOpRegister(
const raw_reg = try self.register_manager.allocReg(track_inst);
const reg = registerAlias(raw_reg, lhs_ty.abiSize(self.target.*));
self.register_manager.freezeRegs(&.{reg});
if (track_inst) |inst| branch.inst_table.putAssumeCapacity(inst, .{ .register = reg });
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{lhs_reg});
const new_lhs_lock = self.register_manager.freezeReg(lhs_reg);
defer if (new_lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const rhs_reg = if (rhs_is_register) rhs.register else blk: {
const track_inst: ?Air.Inst.Index = if (maybe_inst) |inst| inst: {
@ -1286,13 +1305,13 @@ fn binOpRegister(
const raw_reg = try self.register_manager.allocReg(track_inst);
const reg = registerAlias(raw_reg, rhs_ty.abiAlignment(self.target.*));
self.register_manager.freezeRegs(&.{reg});
if (track_inst) |inst| branch.inst_table.putAssumeCapacity(inst, .{ .register = reg });
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{rhs_reg});
const new_rhs_lock = self.register_manager.freezeReg(rhs_reg);
defer if (new_rhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const dest_reg = switch (mir_tag) {
.cmp_shifted_register => undefined, // cmp has no destination register
@ -1394,7 +1413,11 @@ fn binOpImmediate(
) !MCValue {
const lhs_is_register = lhs == .register;
if (lhs_is_register) self.register_manager.freezeRegs(&.{lhs.register});
const lhs_lock: ?RegisterLock = if (lhs_is_register)
self.register_manager.freezeReg(lhs.register)
else
null;
defer if (lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const branch = &self.branch_stack.items[self.branch_stack.items.len - 1];
@ -1408,13 +1431,13 @@ fn binOpImmediate(
const raw_reg = try self.register_manager.allocReg(track_inst);
const reg = registerAlias(raw_reg, lhs_ty.abiSize(self.target.*));
self.register_manager.freezeRegs(&.{reg});
if (track_inst) |inst| branch.inst_table.putAssumeCapacity(inst, .{ .register = reg });
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{lhs_reg});
const new_lhs_lock = self.register_manager.freezeReg(lhs_reg);
defer if (new_lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const dest_reg = switch (mir_tag) {
.cmp_immediate => undefined, // cmp has no destination register
@ -1758,7 +1781,10 @@ fn airBinOp(self: *Self, inst: Air.Inst.Index) !void {
const lhs_ty = self.air.typeOf(bin_op.lhs);
const rhs_ty = self.air.typeOf(bin_op.rhs);
const result: MCValue = if (self.liveness.isUnused(inst)) .dead else try self.binOp(tag, inst, lhs, rhs, lhs_ty, rhs_ty);
const result: MCValue = if (self.liveness.isUnused(inst))
.dead
else
try self.binOp(tag, inst, lhs, rhs, lhs_ty, rhs_ty);
return self.finishAir(inst, result, .{ bin_op.lhs, bin_op.rhs, .none });
}
@ -1815,13 +1841,13 @@ fn airOverflow(self: *Self, inst: Air.Inst.Index) !void {
};
const dest = try self.binOp(base_tag, null, lhs, rhs, lhs_ty, rhs_ty);
const dest_reg = dest.register;
self.register_manager.freezeRegs(&.{dest_reg});
defer self.register_manager.unfreezeRegs(&.{dest_reg});
const dest_reg_lock = self.register_manager.freezeRegAssumeUnused(dest_reg);
defer self.register_manager.unfreezeReg(dest_reg_lock);
const raw_truncated_reg = try self.register_manager.allocReg(null);
const truncated_reg = registerAlias(raw_truncated_reg, lhs_ty.abiSize(self.target.*));
self.register_manager.freezeRegs(&.{truncated_reg});
defer self.register_manager.unfreezeRegs(&.{truncated_reg});
const truncated_reg_lock = self.register_manager.freezeRegAssumeUnused(truncated_reg);
defer self.register_manager.unfreezeReg(truncated_reg_lock);
// sbfx/ubfx truncated, dest, #0, #bits
try self.truncRegister(dest_reg, truncated_reg, int_info.signedness, int_info.bits);
@ -1922,12 +1948,12 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
const dest = try self.binOpRegister(base_tag, null, lhs, rhs, lhs_ty, rhs_ty);
const dest_reg = dest.register;
self.register_manager.freezeRegs(&.{dest_reg});
defer self.register_manager.unfreezeRegs(&.{dest_reg});
const dest_reg_lock = self.register_manager.freezeRegAssumeUnused(dest_reg);
defer self.register_manager.unfreezeReg(dest_reg_lock);
const truncated_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{truncated_reg});
defer self.register_manager.unfreezeRegs(&.{truncated_reg});
const truncated_reg_lock = self.register_manager.freezeRegAssumeUnused(truncated_reg);
defer self.register_manager.unfreezeReg(truncated_reg_lock);
try self.truncRegister(
dest_reg.to32(),
@ -1977,36 +2003,44 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
const lhs_is_register = lhs == .register;
const rhs_is_register = rhs == .register;
if (lhs_is_register) self.register_manager.freezeRegs(&.{lhs.register});
if (rhs_is_register) self.register_manager.freezeRegs(&.{rhs.register});
const lhs_lock: ?RegisterLock = if (lhs_is_register)
self.register_manager.freezeRegAssumeUnused(lhs.register)
else
null;
defer if (lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const rhs_lock: ?RegisterLock = if (rhs_is_register)
self.register_manager.freezeRegAssumeUnused(rhs.register)
else
null;
defer if (rhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const lhs_reg = if (lhs_is_register) lhs.register else blk: {
const raw_reg = try self.register_manager.allocReg(null);
const reg = registerAlias(raw_reg, lhs_ty.abiSize(self.target.*));
self.register_manager.freezeRegs(&.{reg});
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{lhs_reg});
const new_lhs_lock = self.register_manager.freezeReg(lhs_reg);
defer if (new_lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const rhs_reg = if (rhs_is_register) rhs.register else blk: {
const raw_reg = try self.register_manager.allocReg(null);
const reg = registerAlias(raw_reg, rhs_ty.abiAlignment(self.target.*));
self.register_manager.freezeRegs(&.{reg});
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{rhs_reg});
const new_rhs_lock = self.register_manager.freezeReg(rhs_reg);
defer if (new_rhs_lock) |reg| self.register_manager.unfreezeReg(reg);
if (!lhs_is_register) try self.genSetReg(lhs_ty, lhs_reg, lhs);
if (!rhs_is_register) try self.genSetReg(rhs_ty, rhs_reg, rhs);
// TODO reuse operands
const dest_reg = blk: {
const raw_reg = try self.register_manager.allocReg(null);
const reg = registerAlias(raw_reg, lhs_ty.abiSize(self.target.*));
self.register_manager.freezeRegs(&.{reg});
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{dest_reg});
const dest_reg_lock = self.register_manager.freezeRegAssumeUnused(dest_reg);
defer self.register_manager.unfreezeReg(dest_reg_lock);
switch (int_info.signedness) {
.signed => {
@ -2021,8 +2055,8 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
});
const dest_high_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{dest_high_reg});
defer self.register_manager.unfreezeRegs(&.{dest_high_reg});
const dest_high_reg_lock = self.register_manager.freezeRegAssumeUnused(dest_high_reg);
defer self.register_manager.unfreezeReg(dest_high_reg_lock);
// smulh dest_high, lhs, rhs
_ = try self.addInst(.{
@ -2071,8 +2105,8 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
},
.unsigned => {
const dest_high_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{dest_high_reg});
defer self.register_manager.unfreezeRegs(&.{dest_high_reg});
const dest_high_reg_lock = self.register_manager.freezeRegAssumeUnused(dest_high_reg);
defer self.register_manager.unfreezeReg(dest_high_reg_lock);
// umulh dest_high, lhs, rhs
_ = try self.addInst(.{
@ -2127,8 +2161,8 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
}
const truncated_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{truncated_reg});
defer self.register_manager.unfreezeRegs(&.{truncated_reg});
const truncated_reg_lock = self.register_manager.freezeRegAssumeUnused(truncated_reg);
defer self.register_manager.unfreezeReg(truncated_reg_lock);
try self.truncRegister(dest_reg, truncated_reg, int_info.signedness, int_info.bits);
@ -2168,14 +2202,20 @@ fn airShlWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
if (int_info.bits <= 64) {
const stack_offset = try self.allocMem(inst, tuple_size, tuple_align);
if (lhs == .register) self.register_manager.freezeRegs(&.{lhs.register});
defer if (lhs == .register) self.register_manager.unfreezeRegs(&.{lhs.register});
const lhs_lock: ?RegisterLock = if (lhs == .register)
self.register_manager.freezeRegAssumeUnused(lhs.register)
else
null;
defer if (lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
try self.spillCompareFlagsIfOccupied();
self.compare_flags_inst = null;
// lsl dest, lhs, rhs
const dest = try self.binOp(.shl, null, lhs, rhs, lhs_ty, rhs_ty);
const dest_reg = dest.register;
const dest_reg_lock = self.register_manager.freezeRegAssumeUnused(dest_reg);
defer self.register_manager.unfreezeReg(dest_reg_lock);
// asr/lsr reconstructed, dest, rhs
const reconstructed = try self.binOp(.shr, null, dest, rhs, lhs_ty, rhs_ty);
@ -2184,7 +2224,9 @@ fn airShlWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
_ = try self.binOp(.cmp_eq, null, lhs, reconstructed, lhs_ty, lhs_ty);
try self.genSetStack(lhs_ty, stack_offset, dest);
try self.genSetStack(Type.initTag(.u1), stack_offset - overflow_bit_offset, .{ .compare_flags_unsigned = .neq });
try self.genSetStack(Type.initTag(.u1), stack_offset - overflow_bit_offset, .{
.compare_flags_unsigned = .neq,
});
break :result MCValue{ .stack_offset = stack_offset };
} else {
@ -2411,14 +2453,18 @@ fn airSliceElemVal(self: *Self, inst: Air.Inst.Index) !void {
var buf: Type.SlicePtrFieldTypeBuffer = undefined;
const slice_ptr_field_type = slice_ty.slicePtrFieldType(&buf);
if (index_is_register) self.register_manager.freezeRegs(&.{index_mcv.register});
defer if (index_is_register) self.register_manager.unfreezeRegs(&.{index_mcv.register});
const index_lock: ?RegisterLock = if (index_is_register)
self.register_manager.freezeRegAssumeUnused(index_mcv.register)
else
null;
defer if (index_lock) |reg| self.register_manager.unfreezeReg(reg);
const base_mcv: MCValue = switch (slice_mcv) {
.stack_offset => |off| .{ .register = try self.copyToTmpRegister(slice_ptr_field_type, .{ .stack_offset = off }) },
else => return self.fail("TODO slice_elem_val when slice is {}", .{slice_mcv}),
};
self.register_manager.freezeRegs(&.{base_mcv.register});
const base_lock = self.register_manager.freezeRegAssumeUnused(base_mcv.register);
defer self.register_manager.unfreezeReg(base_lock);
switch (elem_size) {
else => {
@ -2559,8 +2605,8 @@ fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!vo
.immediate => |imm| try self.setRegOrMem(elem_ty, dst_mcv, .{ .memory = imm }),
.ptr_stack_offset => |off| try self.setRegOrMem(elem_ty, dst_mcv, .{ .stack_offset = off }),
.register => |addr_reg| {
self.register_manager.freezeRegs(&.{addr_reg});
defer self.register_manager.unfreezeRegs(&.{addr_reg});
const addr_reg_lock = self.register_manager.freezeReg(addr_reg);
defer if (addr_reg_lock) |reg| self.register_manager.unfreezeReg(reg);
switch (dst_mcv) {
.dead => unreachable,
@ -2573,16 +2619,19 @@ fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!vo
if (elem_size <= 8) {
const raw_tmp_reg = try self.register_manager.allocReg(null);
const tmp_reg = registerAlias(raw_tmp_reg, elem_size);
self.register_manager.freezeRegs(&.{tmp_reg});
defer self.register_manager.unfreezeRegs(&.{tmp_reg});
const tmp_reg_lock = self.register_manager.freezeRegAssumeUnused(tmp_reg);
defer self.register_manager.unfreezeReg(tmp_reg_lock);
try self.load(.{ .register = tmp_reg }, ptr, ptr_ty);
try self.genSetStack(elem_ty, off, MCValue{ .register = tmp_reg });
} else {
// TODO optimize the register allocation
const regs = try self.register_manager.allocRegs(4, .{ null, null, null, null });
self.register_manager.freezeRegs(&regs);
defer self.register_manager.unfreezeRegs(&regs);
var regs_locks: [4]RegisterLock = undefined;
self.register_manager.freezeRegsAssumeUnused(4, regs, &regs_locks);
defer for (regs_locks) |reg| {
self.register_manager.unfreezeReg(reg);
};
const src_reg = addr_reg;
const dst_reg = regs[0];
@ -2784,8 +2833,8 @@ fn store(self: *Self, ptr: MCValue, value: MCValue, ptr_ty: Type, value_ty: Type
try self.genSetStack(value_ty, off, value);
},
.register => |addr_reg| {
self.register_manager.freezeRegs(&.{addr_reg});
defer self.register_manager.unfreezeRegs(&.{addr_reg});
const addr_reg_lock = self.register_manager.freezeReg(addr_reg);
defer if (addr_reg_lock) |reg| self.register_manager.unfreezeReg(reg);
switch (value) {
.register => |value_reg| {
@ -2795,8 +2844,8 @@ fn store(self: *Self, ptr: MCValue, value: MCValue, ptr_ty: Type, value_ty: Type
if (abi_size <= 8) {
const raw_tmp_reg = try self.register_manager.allocReg(null);
const tmp_reg = registerAlias(raw_tmp_reg, abi_size);
self.register_manager.freezeRegs(&.{tmp_reg});
defer self.register_manager.unfreezeRegs(&.{tmp_reg});
const tmp_reg_lock = self.register_manager.freezeRegAssumeUnused(tmp_reg);
defer self.register_manager.unfreezeReg(tmp_reg_lock);
try self.genSetReg(value_ty, tmp_reg, value);
try self.store(ptr, .{ .register = tmp_reg }, ptr_ty, value_ty);
@ -2856,12 +2905,12 @@ fn structFieldPtr(self: *Self, inst: Air.Inst.Index, operand: Air.Inst.Ref, inde
const offset_reg = try self.copyToTmpRegister(ptr_ty, .{
.immediate = struct_field_offset,
});
self.register_manager.freezeRegs(&.{offset_reg});
defer self.register_manager.unfreezeRegs(&.{offset_reg});
const offset_reg_lock = self.register_manager.freezeRegAssumeUnused(offset_reg);
defer self.register_manager.unfreezeReg(offset_reg_lock);
const addr_reg = try self.copyToTmpRegister(ptr_ty, mcv);
self.register_manager.freezeRegs(&.{addr_reg});
defer self.register_manager.unfreezeRegs(&.{addr_reg});
const addr_reg_lock = self.register_manager.freezeRegAssumeUnused(addr_reg);
defer self.register_manager.unfreezeReg(addr_reg_lock);
const dest = try self.binOp(
.add,
@ -3369,6 +3418,9 @@ fn airCondBr(self: *Self, inst: Air.Inst.Index) !void {
const parent_compare_flags_inst = self.compare_flags_inst;
try self.branch_stack.append(.{});
errdefer {
_ = self.branch_stack.pop();
}
try self.ensureProcessDeathCapacity(liveness_condbr.then_deaths.len);
for (liveness_condbr.then_deaths) |operand| {
@ -3955,8 +4007,38 @@ fn genSetStack(self: *Self, ty: Type, stack_offset: u32, mcv: MCValue) InnerErro
},
.register_c_flag,
.register_v_flag,
=> {
return self.fail("TODO implement genSetStack {}", .{mcv});
=> |reg| {
const reg_lock = self.register_manager.freezeReg(reg);
defer if (reg_lock) |locked_reg| self.register_manager.unfreezeReg(locked_reg);
const wrapped_ty = ty.structFieldType(0);
try self.genSetStack(wrapped_ty, stack_offset, .{ .register = reg });
const overflow_bit_ty = ty.structFieldType(1);
const overflow_bit_offset = @intCast(u32, ty.structFieldOffset(1, self.target.*));
const raw_cond_reg = try self.register_manager.allocReg(null);
const cond_reg = registerAlias(
raw_cond_reg,
@intCast(u32, overflow_bit_ty.abiSize(self.target.*)),
);
// C flag: cset reg, cs
// V flag: cset reg, vs
_ = try self.addInst(.{
.tag = .cset,
.data = .{ .r_cond = .{
.rd = cond_reg,
.cond = switch (mcv) {
.register_c_flag => .cs,
.register_v_flag => .vs,
else => unreachable,
},
} },
});
try self.genSetStack(overflow_bit_ty, stack_offset - overflow_bit_offset, .{
.register = cond_reg,
});
},
.got_load,
.direct_load,
@ -3983,8 +4065,11 @@ fn genSetStack(self: *Self, ty: Type, stack_offset: u32, mcv: MCValue) InnerErro
// TODO call extern memcpy
const regs = try self.register_manager.allocRegs(5, .{ null, null, null, null, null });
self.register_manager.freezeRegs(&regs);
defer self.register_manager.unfreezeRegs(&regs);
var regs_locks: [5]RegisterLock = undefined;
self.register_manager.freezeRegsAssumeUnused(5, regs, &regs_locks);
defer for (regs_locks) |reg| {
self.register_manager.unfreezeReg(reg);
};
const src_reg = regs[0];
const dst_reg = regs[1];

174
src/arch/arm/CodeGen.zig
View file

@ -23,6 +23,7 @@ const log = std.log.scoped(.codegen);
const build_options = @import("build_options");
const RegisterManagerFn = @import("../../register_manager.zig").RegisterManager;
const RegisterManager = RegisterManagerFn(Self, Register, &allocatable_registers);
const RegisterLock = RegisterManager.RegisterLock;
const FnResult = @import("../../codegen.zig").FnResult;
const GenerateSymbolError = @import("../../codegen.zig").GenerateSymbolError;
@ -1038,8 +1039,8 @@ fn trunc(
}
},
};
self.register_manager.freezeRegs(&.{operand_reg});
defer self.register_manager.unfreezeRegs(&.{operand_reg});
const operand_reg_lock = self.register_manager.freezeReg(operand_reg);
defer if (operand_reg_lock) |reg| self.register_manager.unfreezeReg(reg);
const dest_reg = if (maybe_inst) |inst| blk: {
const ty_op = self.air.instructions.items(.data)[inst].ty_op;
@ -1127,8 +1128,8 @@ fn airNot(self: *Self, inst: Air.Inst.Index) !void {
.register => |r| r,
else => try self.copyToTmpRegister(operand_ty, operand),
};
self.register_manager.freezeRegs(&.{op_reg});
defer self.register_manager.unfreezeRegs(&.{op_reg});
const op_reg_lock = self.register_manager.freezeRegAssumeUnused(op_reg);
defer self.register_manager.unfreezeReg(op_reg_lock);
const dest_reg = blk: {
if (operand == .register and self.reuseOperand(inst, ty_op.operand, 0, operand)) {
@ -1157,8 +1158,8 @@ fn airNot(self: *Self, inst: Air.Inst.Index) !void {
.register => |r| r,
else => try self.copyToTmpRegister(operand_ty, operand),
};
self.register_manager.freezeRegs(&.{op_reg});
defer self.register_manager.unfreezeRegs(&.{op_reg});
const op_reg_lock = self.register_manager.freezeRegAssumeUnused(op_reg);
defer self.register_manager.unfreezeReg(op_reg_lock);
const dest_reg = blk: {
if (operand == .register and self.reuseOperand(inst, ty_op.operand, 0, operand)) {
@ -1218,15 +1219,15 @@ fn minMax(
.register => |r| r,
else => try self.copyToTmpRegister(lhs_ty, lhs),
};
self.register_manager.freezeRegs(&.{lhs_reg});
defer self.register_manager.unfreezeRegs(&.{lhs_reg});
const lhs_reg_lock = self.register_manager.freezeReg(lhs_reg);
defer if (lhs_reg_lock) |reg| self.register_manager.unfreezeReg(reg);
const rhs_reg = switch (rhs) {
.register => |r| r,
else => try self.copyToTmpRegister(rhs_ty, rhs),
};
self.register_manager.freezeRegs(&.{rhs_reg});
defer self.register_manager.unfreezeRegs(&.{rhs_reg});
const rhs_reg_lock = self.register_manager.freezeReg(rhs_reg);
defer if (rhs_reg_lock) |reg| self.register_manager.unfreezeReg(reg);
const dest_reg = if (maybe_inst) |inst| blk: {
const bin_op = self.air.instructions.items(.data)[inst].bin_op;
@ -1392,12 +1393,12 @@ fn airOverflow(self: *Self, inst: Air.Inst.Index) !void {
};
const dest = try self.binOp(base_tag, null, lhs, rhs, lhs_ty, rhs_ty);
const dest_reg = dest.register;
self.register_manager.freezeRegs(&.{dest_reg});
defer self.register_manager.unfreezeRegs(&.{dest_reg});
const dest_reg_lock = self.register_manager.freezeRegAssumeUnused(dest_reg);
defer self.register_manager.unfreezeReg(dest_reg_lock);
const truncated_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{truncated_reg});
defer self.register_manager.unfreezeRegs(&.{truncated_reg});
const truncated_reg_lock = self.register_manager.freezeRegAssumeUnused(truncated_reg);
defer self.register_manager.unfreezeReg(truncated_reg_lock);
// sbfx/ubfx truncated, dest, #0, #bits
try self.truncRegister(dest_reg, truncated_reg, int_info.signedness, int_info.bits);
@ -1493,12 +1494,12 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
const dest = try self.binOpRegister(base_tag, null, lhs, rhs, lhs_ty, rhs_ty);
const dest_reg = dest.register;
self.register_manager.freezeRegs(&.{dest_reg});
defer self.register_manager.unfreezeRegs(&.{dest_reg});
const dest_reg_lock = self.register_manager.freezeRegAssumeUnused(dest_reg);
defer self.register_manager.unfreezeReg(dest_reg_lock);
const truncated_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{truncated_reg});
defer self.register_manager.unfreezeRegs(&.{truncated_reg});
const truncated_reg_lock = self.register_manager.freezeRegAssumeUnused(truncated_reg);
defer self.register_manager.unfreezeReg(truncated_reg_lock);
// sbfx/ubfx truncated, dest, #0, #bits
try self.truncRegister(dest_reg, truncated_reg, int_info.signedness, int_info.bits);
@ -1526,28 +1527,32 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
const lhs_is_register = lhs == .register;
const rhs_is_register = rhs == .register;
if (lhs_is_register) self.register_manager.freezeRegs(&.{lhs.register});
if (rhs_is_register) self.register_manager.freezeRegs(&.{rhs.register});
const lhs_lock: ?RegisterLock = if (lhs_is_register)
self.register_manager.freezeReg(lhs.register)
else
null;
defer if (lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const lhs_reg = if (lhs_is_register) lhs.register else blk: {
const reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{reg});
const lhs_reg = if (lhs_is_register)
lhs.register
else
try self.register_manager.allocReg(null);
const new_lhs_lock = self.register_manager.freezeReg(lhs_reg);
defer if (new_lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{lhs_reg});
const rhs_reg = if (rhs_is_register) rhs.register else blk: {
const reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{reg});
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{rhs_reg});
const rhs_reg = if (rhs_is_register)
rhs.register
else
try self.register_manager.allocReg(null);
const new_rhs_lock = self.register_manager.freezeReg(rhs_reg);
defer if (new_rhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const dest_regs = try self.register_manager.allocRegs(2, .{ null, null });
self.register_manager.freezeRegs(&dest_regs);
defer self.register_manager.unfreezeRegs(&dest_regs);
var dest_regs_locks: [2]RegisterLock = undefined;
self.register_manager.freezeRegsAssumeUnused(2, dest_regs, &dest_regs_locks);
defer for (dest_regs_locks) |reg| {
self.register_manager.unfreezeReg(reg);
};
const rdlo = dest_regs[0];
const rdhi = dest_regs[1];
@ -1555,8 +1560,8 @@ fn airMulWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
if (!rhs_is_register) try self.genSetReg(rhs_ty, rhs_reg, rhs);
const truncated_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{truncated_reg});
defer self.register_manager.unfreezeRegs(&.{truncated_reg});
const truncated_reg_lock = self.register_manager.freezeRegAssumeUnused(truncated_reg);
defer self.register_manager.unfreezeReg(truncated_reg_lock);
_ = try self.addInst(.{
.tag = base_tag,
@ -1648,8 +1653,11 @@ fn airShlWithOverflow(self: *Self, inst: Air.Inst.Index) !void {
if (int_info.bits <= 32) {
const stack_offset = try self.allocMem(inst, tuple_size, tuple_align);
if (lhs == .register) self.register_manager.freezeRegs(&.{lhs.register});
defer if (lhs == .register) self.register_manager.unfreezeRegs(&.{lhs.register});
const lhs_lock: ?RegisterLock = if (lhs == .register)
self.register_manager.freezeRegAssumeUnused(lhs.register)
else
null;
defer if (lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
try self.spillCompareFlagsIfOccupied();
self.compare_flags_inst = null;
@ -1939,8 +1947,11 @@ fn airSliceElemVal(self: *Self, inst: Air.Inst.Index) !void {
var buf: Type.SlicePtrFieldTypeBuffer = undefined;
const slice_ptr_field_type = slice_ty.slicePtrFieldType(&buf);
if (index_is_register) self.register_manager.freezeRegs(&.{index_mcv.register});
defer if (index_is_register) self.register_manager.unfreezeRegs(&.{index_mcv.register});
const index_lock: ?RegisterLock = if (index_is_register)
self.register_manager.freezeRegAssumeUnused(index_mcv.register)
else
null;
defer if (index_lock) |reg| self.register_manager.unfreezeReg(reg);
const base_mcv = slicePtr(slice_mcv);
@ -1950,20 +1961,20 @@ fn airSliceElemVal(self: *Self, inst: Air.Inst.Index) !void {
.register => |r| r,
else => try self.copyToTmpRegister(slice_ptr_field_type, base_mcv),
};
self.register_manager.freezeRegs(&.{base_reg});
defer self.register_manager.unfreezeRegs(&.{base_reg});
const base_reg_lock = self.register_manager.freezeRegAssumeUnused(base_reg);
defer self.register_manager.unfreezeReg(base_reg_lock);
const dst_reg = try self.register_manager.allocReg(inst);
const dst_mcv = MCValue{ .register = dst_reg };
self.register_manager.freezeRegs(&.{dst_reg});
defer self.register_manager.unfreezeRegs(&.{dst_reg});
const dst_reg_lock = self.register_manager.freezeRegAssumeUnused(dst_reg);
defer self.register_manager.unfreezeReg(dst_reg_lock);
const index_reg: Register = switch (index_mcv) {
.register => |reg| reg,
else => try self.copyToTmpRegister(Type.usize, index_mcv),
};
self.register_manager.freezeRegs(&.{index_reg});
defer self.register_manager.unfreezeRegs(&.{index_reg});
const index_reg_lock = self.register_manager.freezeRegAssumeUnused(index_reg);
defer self.register_manager.unfreezeReg(index_reg_lock);
const tag: Mir.Inst.Tag = switch (elem_size) {
1 => .ldrb,
@ -2149,8 +2160,8 @@ fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!vo
.immediate => |imm| try self.setRegOrMem(elem_ty, dst_mcv, .{ .memory = imm }),
.ptr_stack_offset => |off| try self.setRegOrMem(elem_ty, dst_mcv, .{ .stack_offset = off }),
.register => |reg| {
self.register_manager.freezeRegs(&.{reg});
defer self.register_manager.unfreezeRegs(&.{reg});
const reg_lock = self.register_manager.freezeReg(reg);
defer if (reg_lock) |reg_locked| self.register_manager.unfreezeReg(reg_locked);
switch (dst_mcv) {
.dead => unreachable,
@ -2162,16 +2173,19 @@ fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!vo
.stack_offset => |off| {
if (elem_size <= 4) {
const tmp_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{tmp_reg});
defer self.register_manager.unfreezeRegs(&.{tmp_reg});
const tmp_reg_lock = self.register_manager.freezeRegAssumeUnused(tmp_reg);
defer self.register_manager.unfreezeReg(tmp_reg_lock);
try self.load(.{ .register = tmp_reg }, ptr, ptr_ty);
try self.genSetStack(elem_ty, off, MCValue{ .register = tmp_reg });
} else {
// TODO optimize the register allocation
const regs = try self.register_manager.allocRegs(4, .{ null, null, null, null });
self.register_manager.freezeRegs(&regs);
defer self.register_manager.unfreezeRegs(&regs);
var regs_locks: [4]RegisterLock = undefined;
self.register_manager.freezeRegsAssumeUnused(4, regs, &regs_locks);
defer for (regs_locks) |reg_locked| {
self.register_manager.unfreezeReg(reg_locked);
};
const src_reg = reg;
const dst_reg = regs[0];
@ -2197,8 +2211,8 @@ fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!vo
.stack_argument_offset,
=> {
const reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{reg});
defer self.register_manager.unfreezeRegs(&.{reg});
const reg_lock = self.register_manager.freezeRegAssumeUnused(reg);
defer self.register_manager.unfreezeReg(reg_lock);
try self.genSetReg(ptr_ty, reg, ptr);
try self.load(dst_mcv, .{ .register = reg }, ptr_ty);
@ -2252,8 +2266,8 @@ fn store(self: *Self, ptr: MCValue, value: MCValue, ptr_ty: Type, value_ty: Type
try self.genSetStack(value_ty, off, value);
},
.register => |addr_reg| {
self.register_manager.freezeRegs(&.{addr_reg});
defer self.register_manager.unfreezeRegs(&.{addr_reg});
const addr_reg_lock = self.register_manager.freezeReg(addr_reg);
defer if (addr_reg_lock) |reg| self.register_manager.unfreezeReg(reg);
switch (value) {
.dead => unreachable,
@ -2264,15 +2278,18 @@ fn store(self: *Self, ptr: MCValue, value: MCValue, ptr_ty: Type, value_ty: Type
else => {
if (elem_size <= 4) {
const tmp_reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{tmp_reg});
defer self.register_manager.unfreezeRegs(&.{tmp_reg});
const tmp_reg_lock = self.register_manager.freezeRegAssumeUnused(tmp_reg);
defer self.register_manager.unfreezeReg(tmp_reg_lock);
try self.genSetReg(value_ty, tmp_reg, value);
try self.store(ptr, .{ .register = tmp_reg }, ptr_ty, value_ty);
} else {
const regs = try self.register_manager.allocRegs(4, .{ null, null, null, null });
self.register_manager.freezeRegs(&regs);
defer self.register_manager.unfreezeRegs(&regs);
var regs_locks: [4]RegisterLock = undefined;
self.register_manager.freezeRegsAssumeUnused(4, regs, &regs_locks);
defer for (regs_locks) |reg| {
self.register_manager.unfreezeReg(reg);
};
const src_reg = regs[0];
const dst_reg = addr_reg;
@ -2356,12 +2373,12 @@ fn structFieldPtr(self: *Self, inst: Air.Inst.Index, operand: Air.Inst.Ref, inde
const offset_reg = try self.copyToTmpRegister(ptr_ty, .{
.immediate = struct_field_offset,
});
self.register_manager.freezeRegs(&.{offset_reg});
defer self.register_manager.unfreezeRegs(&.{offset_reg});
const offset_reg_lock = self.register_manager.freezeRegAssumeUnused(offset_reg);
defer self.register_manager.unfreezeReg(offset_reg_lock);
const addr_reg = try self.copyToTmpRegister(ptr_ty, mcv);
self.register_manager.freezeRegs(&.{addr_reg});
defer self.register_manager.unfreezeRegs(&.{addr_reg});
const addr_reg_lock = self.register_manager.freezeRegAssumeUnused(addr_reg);
defer self.register_manager.unfreezeReg(addr_reg_lock);
const dest = try self.binOp(
.add,
@ -2477,8 +2494,11 @@ fn binOpRegister(
const lhs_is_register = lhs == .register;
const rhs_is_register = rhs == .register;
if (lhs_is_register) self.register_manager.freezeRegs(&.{lhs.register});
if (rhs_is_register) self.register_manager.freezeRegs(&.{rhs.register});
const lhs_lock: ?RegisterLock = if (lhs_is_register)
self.register_manager.freezeReg(lhs.register)
else
null;
defer if (lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const branch = &self.branch_stack.items[self.branch_stack.items.len - 1];
@ -2489,13 +2509,13 @@ fn binOpRegister(
} else null;
const reg = try self.register_manager.allocReg(track_inst);
self.register_manager.freezeRegs(&.{reg});
if (track_inst) |inst| branch.inst_table.putAssumeCapacity(inst, .{ .register = reg });
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{lhs_reg});
const new_lhs_lock = self.register_manager.freezeReg(lhs_reg);
defer if (new_lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const rhs_reg = if (rhs_is_register) rhs.register else blk: {
const track_inst: ?Air.Inst.Index = if (maybe_inst) |inst| inst: {
@ -2504,13 +2524,13 @@ fn binOpRegister(
} else null;
const reg = try self.register_manager.allocReg(track_inst);
self.register_manager.freezeRegs(&.{reg});
if (track_inst) |inst| branch.inst_table.putAssumeCapacity(inst, .{ .register = reg });
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{rhs_reg});
const new_rhs_lock = self.register_manager.freezeReg(rhs_reg);
defer if (new_rhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const dest_reg = switch (mir_tag) {
.cmp => .r0, // cmp has no destination regardless
@ -2593,7 +2613,11 @@ fn binOpImmediate(
) !MCValue {
const lhs_is_register = lhs == .register;
if (lhs_is_register) self.register_manager.freezeRegs(&.{lhs.register});
const lhs_lock: ?RegisterLock = if (lhs_is_register)
self.register_manager.freezeReg(lhs.register)
else
null;
defer if (lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const branch = &self.branch_stack.items[self.branch_stack.items.len - 1];
@ -2606,13 +2630,13 @@ fn binOpImmediate(
} else null;
const reg = try self.register_manager.allocReg(track_inst);
self.register_manager.freezeRegs(&.{reg});
if (track_inst) |inst| branch.inst_table.putAssumeCapacity(inst, .{ .register = reg });
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{lhs_reg});
const new_lhs_lock = self.register_manager.freezeReg(lhs_reg);
defer if (new_lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const dest_reg = switch (mir_tag) {
.cmp => .r0, // cmp has no destination reg

20
src/arch/riscv64/CodeGen.zig
View file

@ -23,6 +23,7 @@ const log = std.log.scoped(.codegen);
const build_options = @import("build_options");
const RegisterManagerFn = @import("../../register_manager.zig").RegisterManager;
const RegisterManager = RegisterManagerFn(Self, Register, &callee_preserved_regs);
const RegisterLock = RegisterManager.RegisterLock;
const FnResult = @import("../../codegen.zig").FnResult;
const GenerateSymbolError = @import("../../codegen.zig").GenerateSymbolError;
@ -937,8 +938,11 @@ fn binOpRegister(
const lhs_is_register = lhs == .register;
const rhs_is_register = rhs == .register;
if (lhs_is_register) self.register_manager.freezeRegs(&.{lhs.register});
if (rhs_is_register) self.register_manager.freezeRegs(&.{rhs.register});
const lhs_lock: ?RegisterLock = if (lhs_is_register)
self.register_manager.freezeReg(lhs.register)
else
null;
defer if (lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const branch = &self.branch_stack.items[self.branch_stack.items.len - 1];
@ -949,13 +953,13 @@ fn binOpRegister(
} else null;
const reg = try self.register_manager.allocReg(track_inst);
self.register_manager.freezeRegs(&.{reg});
if (track_inst) |inst| branch.inst_table.putAssumeCapacity(inst, .{ .register = reg });
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{lhs_reg});
const new_lhs_lock = self.register_manager.freezeReg(lhs_reg);
defer if (new_lhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const rhs_reg = if (rhs_is_register) rhs.register else blk: {
const track_inst: ?Air.Inst.Index = if (maybe_inst) |inst| inst: {
@ -964,13 +968,13 @@ fn binOpRegister(
} else null;
const reg = try self.register_manager.allocReg(track_inst);
self.register_manager.freezeRegs(&.{reg});
if (track_inst) |inst| branch.inst_table.putAssumeCapacity(inst, .{ .register = reg });
break :blk reg;
};
defer self.register_manager.unfreezeRegs(&.{rhs_reg});
const new_rhs_lock = self.register_manager.freezeReg(rhs_reg);
defer if (new_rhs_lock) |reg| self.register_manager.unfreezeReg(reg);
const dest_reg = if (maybe_inst) |inst| blk: {
const bin_op = self.air.instructions.items(.data)[inst].bin_op;
@ -1448,8 +1452,8 @@ fn load(self: *Self, dst_mcv: MCValue, ptr: MCValue, ptr_ty: Type) InnerError!vo
.stack_offset,
=> {
const reg = try self.register_manager.allocReg(null);
self.register_manager.freezeRegs(&.{reg});
defer self.register_manager.unfreezeRegs(&.{reg});
const reg_lock = self.register_manager.freezeRegAssumeUnused(reg);
defer self.register_manager.unfreezeReg(reg_lock);
try self.genSetReg(ptr_ty, reg, ptr);
try self.load(dst_mcv, .{ .register = reg }, ptr_ty);

647
src/arch/x86_64/CodeGen.zig
View file

File diff suppressed because it is too large Load diff

67
src/register_manager.zig
View file

@ -116,22 +116,51 @@ pub fn RegisterManager(
return self.frozen_registers & mask != 0;
}
/// Prevents the registers from being allocated until they are
/// unfrozen again
pub fn freezeRegs(self: *Self, regs: []const Register) void {
for (regs) |reg| {
const mask = getRegisterMask(reg) orelse continue;
pub const RegisterLock = struct {
register: Register,
};
/// Prevents the register from being allocated until they are
/// unfrozen again.
/// Returns `RegisterLock` if the register was not already
/// frozen, or `null` otherwise.
/// Only the owner of the `RegisterLock` can unfreeze the
/// register later.
pub fn freezeReg(self: *Self, reg: Register) ?RegisterLock {
if (self.isRegFrozen(reg)) return null;
const mask = getRegisterMask(reg) orelse return null;
self.frozen_registers |= mask;
return RegisterLock{ .register = reg };
}
/// Like `freezeReg` but asserts the register was unused always
/// returning a valid lock.
pub fn freezeRegAssumeUnused(self: *Self, reg: Register) RegisterLock {
assert(!self.isRegFrozen(reg));
const mask = getRegisterMask(reg) orelse unreachable;
self.frozen_registers |= mask;
return RegisterLock{ .register = reg };
}
/// Like `freezeRegAssumeUnused` but locks multiple registers.
pub fn freezeRegsAssumeUnused(
self: *Self,
comptime count: comptime_int,
regs: [count]Register,
buf: *[count]RegisterLock,
) void {
for (&regs) |reg, i| {
buf[i] = self.freezeRegAssumeUnused(reg);
}
}
/// Enables the allocation of the registers
pub fn unfreezeRegs(self: *Self, regs: []const Register) void {
for (regs) |reg| {
const mask = getRegisterMask(reg) orelse continue;
/// Unfreezes the register allowing its re-allocation and re-use.
/// Requires `RegisterLock` to unfreeze a register.
/// Call `freezeReg` to obtain the lock first.
pub fn unfreezeReg(self: *Self, lock: RegisterLock) void {
const mask = getRegisterMask(lock.register) orelse return;
self.frozen_registers &= ~mask;
}
}
/// Returns true when at least one register is frozen
pub fn frozenRegsExist(self: Self) bool {
@ -419,8 +448,8 @@ test "allocReg: spilling" {
// Frozen registers
function.register_manager.freeReg(.r3);
{
function.register_manager.freezeRegs(&.{.r2});
defer function.register_manager.unfreezeRegs(&.{.r2});
const lock = function.register_manager.freezeReg(.r2);
defer if (lock) |reg| function.register_manager.unfreezeReg(reg);
try expectEqual(@as(?MockRegister1, .r3), try function.register_manager.allocReg(mock_instruction));
}
@ -447,8 +476,8 @@ test "tryAllocRegs" {
function.register_manager.freeReg(.r2);
function.register_manager.freeReg(.r3);
{
function.register_manager.freezeRegs(&.{.r1});
defer function.register_manager.unfreezeRegs(&.{.r1});
const lock = function.register_manager.freezeReg(.r1);
defer if (lock) |reg| function.register_manager.unfreezeReg(reg);
try expectEqual([_]MockRegister2{ .r0, .r2, .r3 }, function.register_manager.tryAllocRegs(3, .{ null, null, null }).?);
}
@ -486,8 +515,8 @@ test "allocRegs: normal usage" {
// contain any valuable data anymore and can be reused. For an
// example of that, see `selectively reducing register
// pressure`.
function.register_manager.freezeRegs(&.{result_reg});
defer function.register_manager.unfreezeRegs(&.{result_reg});
const lock = function.register_manager.freezeReg(result_reg);
defer if (lock) |reg| function.register_manager.unfreezeReg(reg);
const regs = try function.register_manager.allocRegs(2, .{ null, null });
try function.genAdd(result_reg, regs[0], regs[1]);
@ -507,16 +536,14 @@ test "allocRegs: selectively reducing register pressure" {
{
const result_reg: MockRegister2 = .r1;
function.register_manager.freezeRegs(&.{result_reg});
defer function.register_manager.unfreezeRegs(&.{result_reg});
const lock = function.register_manager.freezeReg(result_reg);
// Here, we don't defer unfreeze because we manually unfreeze
// after genAdd
const regs = try function.register_manager.allocRegs(2, .{ null, null });
function.register_manager.freezeRegs(&.{result_reg});
try function.genAdd(result_reg, regs[0], regs[1]);
function.register_manager.unfreezeRegs(&regs);
function.register_manager.unfreezeReg(lock.?);
const extra_summand_reg = try function.register_manager.allocReg(null);
try function.genAdd(result_reg, result_reg, extra_summand_reg);

1
test/behavior/align.zig
View file

@ -7,6 +7,7 @@ var foo: u8 align(4) = 100;
test "global variable alignment" {
if (builtin.zig_backend == .stage2_c) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
comptime try expect(@typeInfo(@TypeOf(&foo)).Pointer.alignment == 4);
comptime try expect(@TypeOf(&foo) == *align(4) u8);