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sema: hotpath ++ and ** for array-pointers

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David Rubin 2024-11-28 17:51:51 -08:00
parent bc3094b278
commit 1d78d4f8c1
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70
src/Sema.zig
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@ -15237,6 +15237,76 @@ fn zirArrayCat(sema: *Sema, block: *Block, inst: Zir.Inst.Index) CompileError!Ai
.flags = .{ .address_space = ptr_as },
});
// if both the source and destination are arrays
// we can hot path via a memcpy.
if (lhs_ty.zigTypeTag(zcu) == .pointer and
rhs_ty.zigTypeTag(zcu) == .pointer)
{
const slice_ty = try pt.ptrTypeSema(.{
.child = resolved_elem_ty.toIntern(),
.flags = .{
.size = .Slice,
.address_space = ptr_as,
},
});
const many_ty = try pt.ptrTypeSema(.{
.child = resolved_elem_ty.toIntern(),
.flags = .{
.size = .Many,
.address_space = ptr_as,
},
});
const slice_ty_ref = Air.internedToRef(slice_ty.toIntern());
// lhs_dest_slice = dest[0..lhs.len]
const lhs_len_ref = try pt.intRef(Type.usize, lhs_len);
const lhs_dest_slice = try block.addInst(.{
.tag = .slice,
.data = .{ .ty_pl = .{
.ty = slice_ty_ref,
.payload = try sema.addExtra(Air.Bin{
.lhs = alloc,
.rhs = lhs_len_ref,
}),
} },
});
_ = try block.addBinOp(.memcpy, lhs_dest_slice, lhs);
// rhs_dest_slice = dest[lhs.len..][0..rhs.len]
const rhs_len_ref = try pt.intRef(Type.usize, rhs_len);
const rhs_dest_offset = try block.addInst(.{
.tag = .ptr_add,
.data = .{ .ty_pl = .{
.ty = Air.internedToRef(many_ty.toIntern()),
.payload = try sema.addExtra(Air.Bin{
.lhs = alloc,
.rhs = lhs_len_ref,
}),
} },
});
const rhs_dest_slice = try block.addInst(.{
.tag = .slice,
.data = .{ .ty_pl = .{
.ty = slice_ty_ref,
.payload = try sema.addExtra(Air.Bin{
.lhs = rhs_dest_offset,
.rhs = rhs_len_ref,
}),
} },
});
_ = try block.addBinOp(.memcpy, rhs_dest_slice, rhs);
if (res_sent_val) |sent_val| {
const elem_index = try pt.intRef(Type.usize, result_len);
const elem_ptr = try block.addPtrElemPtr(alloc, elem_index, elem_ptr_ty);
const init = Air.internedToRef((try pt.getCoerced(sent_val, lhs_info.elem_type)).toIntern());
try sema.storePtr2(block, src, elem_ptr, src, init, lhs_src, .store);
}
return alloc;
}
var elem_i: u32 = 0;
while (elem_i < lhs_len) : (elem_i += 1) {
const elem_index = try pt.intRef(Type.usize, elem_i);