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llvm: fix C ABI for <=256 bit vectors

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Closes #13918
This commit is contained in:
Veikka Tuominen 2022-12-20 18:32:06 +02:00
parent 6da070c5ac
commit 9f23702c21
3 changed files with 32 additions and 1 deletions
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3
src/arch/x86_64/abi.zig
View file

@ -143,7 +143,8 @@ pub fn classifySystemV(ty: Type, target: Target, ctx: Context) [8]Class {
.integer, .integer, .integer, .integer,
.integer, .integer, .integer, .integer,
};
if (has_avx512 and bit_size <= 256) return .{
const has_avx = target.cpu.features.isEnabled(@enumToInt(std.Target.x86.Feature.avx));
if (has_avx and bit_size <= 256) return .{
.integer, .integer, .integer, .integer,
.none, .none, .none, .none,
};

13
test/c_abi/cfuncs.c
View file

@ -742,6 +742,19 @@ SmallVec c_ret_small_vec(void) {
return (SmallVec){3, 4};
}
typedef size_t MediumVec __attribute__((vector_size(4 * sizeof(size_t))));
void c_medium_vec(MediumVec vec) {
assert_or_panic(vec[0] == 1);
assert_or_panic(vec[1] == 2);
assert_or_panic(vec[2] == 3);
assert_or_panic(vec[3] == 4);
}
MediumVec c_ret_medium_vec(void) {
return (MediumVec){5, 6, 7, 8};
}
typedef size_t BigVec __attribute__((vector_size(8 * sizeof(size_t))));
void c_big_vec(BigVec vec) {

17
test/c_abi/main.zig
View file

@ -801,6 +801,23 @@ test "small simd vector" {
try expect(x[1] == 4);
}
const MediumVec = @Vector(4, usize);
extern fn c_medium_vec(MediumVec) void;
extern fn c_ret_medium_vec() MediumVec;
test "medium simd vector" {
if (comptime builtin.cpu.arch.isPPC64()) return error.SkipZigTest;
c_medium_vec(.{ 1, 2, 3, 4 });
var x = c_ret_medium_vec();
try expect(x[0] == 5);
try expect(x[1] == 6);
try expect(x[2] == 7);
try expect(x[3] == 8);
}
const BigVec = @Vector(8, usize);
extern fn c_big_vec(BigVec) void;