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compiler_rt: remove bogus tests

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These only worked before because our lowering of the `AAPCS` calling
convention was incorrect in a way which happened to match the ABI of
these functions. The tests aren't actually very helpful -- there are
already tests for `divmoddi4` etc -- so rather than using inline asm on
the caller side to match the ABI, we just delete these two tests.

We were for some reason missing a direct test for `__udivmodsi4`, so one
has been added.
This commit is contained in:
mlugg 2024-10-16 17:13:25 +01:00
parent 289b2f82c3
commit cf39652500
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GPG key ID: 3F5B7DCCBF4AF02E
3 changed files with 8 additions and 77 deletions
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39
lib/compiler_rt/int.zig
View file

@ -10,7 +10,6 @@ const is_test = builtin.is_test;
const common = @import("common.zig");
const udivmod = @import("udivmod.zig").udivmod;
const __divti3 = @import("divti3.zig").__divti3;
const arm = @import("arm.zig");
pub const panic = common.panic;
@ -102,25 +101,6 @@ test "test_divmoddi4" {
}
}
fn test_one_aeabi_ldivmod(a: i64, b: i64, expected_q: i64, expected_r: i64) !void {
const LdivmodRes = extern struct {
q: i64, // r1:r0
r: i64, // r3:r2
};
const actualIdivmod = @as(*const fn (a: i64, b: i64) callconv(.AAPCS) LdivmodRes, @ptrCast(&arm.__aeabi_ldivmod));
const arm_res = actualIdivmod(a, b);
try testing.expectEqual(expected_q, arm_res.q);
try testing.expectEqual(expected_r, arm_res.r);
}
test "arm.__aeabi_ldivmod" {
if (!builtin.cpu.arch.isARM()) return error.SkipZigTest;
for (cases__divmodsi4) |case| {
try test_one_aeabi_ldivmod(case[0], case[1], case[2], case[3]);
}
}
pub fn __udivmoddi4(a: u64, b: u64, maybe_rem: ?*u64) callconv(.C) u64 {
return udivmod(u64, a, b, maybe_rem);
}
@ -261,25 +241,6 @@ test "test_divmodsi4" {
}
}
fn test_one_aeabi_idivmod(a: i32, b: i32, expected_q: i32, expected_r: i32) !void {
const IdivmodRes = extern struct {
q: i32, // r0
r: i32, // r1
};
const actualIdivmod = @as(*const fn (a: i32, b: i32) callconv(.AAPCS) IdivmodRes, @ptrCast(&arm.__aeabi_idivmod));
const arm_res = actualIdivmod(a, b);
try testing.expectEqual(expected_q, arm_res.q);
try testing.expectEqual(expected_r, arm_res.r);
}
test "arm.__aeabi_idivmod" {
if (!builtin.cpu.arch.isARM()) return error.SkipZigTest;
for (cases__divmodsi4) |case| {
try test_one_aeabi_idivmod(case[0], case[1], case[2], case[3]);
}
}
pub fn __udivmodsi4(a: u32, b: u32, rem: *u32) callconv(.C) u32 {
const d = __udivsi3(a, b);
rem.* = @bitCast(@as(i32, @bitCast(a)) -% (@as(i32, @bitCast(d)) * @as(i32, @bitCast(b))));

21
lib/compiler_rt/udivmoddi4_test.zig
View file

@ -3,7 +3,6 @@
const testing = @import("std").testing;
const builtin = @import("builtin");
const __udivmoddi4 = @import("int.zig").__udivmoddi4;
const __aeabi_uldivmod = @import("arm.zig").__aeabi_uldivmod;
fn test__udivmoddi4(a: u64, b: u64, expected_q: u64, expected_r: u64) !void {
var r: u64 = undefined;
@ -18,26 +17,6 @@ test "udivmoddi4" {
}
}
const ARMRes = extern struct {
q: u64, // r1:r0
r: u64, // r3:r2
};
fn test__aeabi_uldivmod(a: u64, b: u64, expected_q: u64, expected_r: u64) !void {
const actualUldivmod = @as(*const fn (a: u64, b: u64) callconv(.AAPCS) ARMRes, @ptrCast(&__aeabi_uldivmod));
const arm_res = actualUldivmod(a, b);
try testing.expectEqual(expected_q, arm_res.q);
try testing.expectEqual(expected_r, arm_res.r);
}
test "arm.__aeabi_uldivmod" {
if (!builtin.cpu.arch.isARM()) return error.SkipZigTest;
for (cases) |case| {
try test__aeabi_uldivmod(case[0], case[1], case[2], case[3]);
}
}
const cases = [_][4]u64{
[_]u64{0x0000000000000000, 0x0000000000000001, 0x0000000000000000, 0x0000000000000000},
[_]u64{0x0000000000000000, 0x0000000000000002, 0x0000000000000000, 0x0000000000000000},

25
lib/compiler_rt/udivmodsi4_test.zig
View file

@ -2,27 +2,18 @@
// zig fmt: off
const testing = @import("std").testing;
const builtin = @import("builtin");
const __aeabi_uidivmod = @import("arm.zig").__aeabi_uidivmod;
const __udivmodsi4 = @import("int.zig").__udivmodsi4;
const ARMRes = extern struct {
q: u32, // r0
r: u32, // r1
};
fn test__aeabi_uidivmod(a: u32, b: u32, expected_q: u32, expected_r: u32) !void {
const actualUidivmod = @as(*const fn (a: u32, b: u32) callconv(.AAPCS) ARMRes, @ptrCast(&__aeabi_uidivmod));
const arm_res = actualUidivmod(a, b);
try testing.expectEqual(expected_q, arm_res.q);
try testing.expectEqual(expected_r, arm_res.r);
fn test__udivmodsi4(a: u32, b: u32, expected_q: u32, expected_r: u32) !void {
var r: u32 = undefined;
const q = __udivmodsi4(a, b, &r);
try testing.expectEqual(expected_q, q);
try testing.expectEqual(expected_r, r);
}
test "arm.__aeabi_uidivmod" {
if (!builtin.cpu.arch.isARM()) return error.SkipZigTest;
var i: i32 = 0;
test "udivmodsi4" {
for (cases) |case| {
try test__aeabi_uidivmod(case[0], case[1], case[2], case[3]);
i+=1;
try test__udivmodsi4(case[0], case[1], case[2], case[3]);
}
}