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sema: fix result ptr coercion array -> vector

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Previously this worked for array to vector where the element type
matched exactly (e.g `[4]u8` to `@Vector(4, u8)`) since that is
performed with a simple `.bitcast` operation, but now it also works for
types where the array is coercible to the vector type (e.g `[4]u8` to
`@Vector(4, u16)`).
This commit is contained in:
John Schmidt 2023-03-08 23:13:37 +01:00
parent 505e720421
commit 0606f0aa55
2 changed files with 33 additions and 0 deletions
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14
src/Sema.zig
View File

@ -2538,6 +2538,20 @@ fn coerceResultPtr(
const trash_inst = trash_block.instructions.pop();
switch (air_tags[trash_inst]) {
// Array coerced to Vector where element size is not equal but coercible.
.aggregate_init => {
const ty_pl = air_datas[trash_inst].ty_pl;
const ptr_operand_ty = try Type.ptr(sema.arena, sema.mod, .{
.pointee_type = try sema.analyzeAsType(block, src, ty_pl.ty),
.@"addrspace" = addr_space,
});
if (try sema.resolveDefinedValue(block, src, new_ptr)) |ptr_val| {
return sema.addConstant(ptr_operand_ty, ptr_val);
} else {
return sema.bitCast(block, ptr_operand_ty, new_ptr, src, null);
}
},
.bitcast => {
const ty_op = air_datas[trash_inst].ty_op;
const operand_ty = sema.typeOf(ty_op.operand);

19
test/behavior/vector.zig
View File

@ -175,6 +175,25 @@ test "array to vector" {
comptime try S.doTheTest();
}
test "array to vector with element type coercion" {
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_arm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_sparc64) return error.SkipZigTest; // TODO
const S = struct {
fn doTheTest() !void {
var foo: f16 = 3.14;
var arr32 = [4]f32{ foo, 1.5, 0.0, 0.0 };
var vec: @Vector(4, f32) = [4]f16{ foo, 1.5, 0.0, 0.0 };
try std.testing.expect(std.mem.eql(f32, &@as([4]f32, vec), &arr32));
}
};
try S.doTheTest();
comptime try S.doTheTest();
}
test "peer type resolution with coercible element types" {
if (builtin.zig_backend == .stage2_wasm) return error.SkipZigTest; // TODO
if (builtin.zig_backend == .stage2_x86_64) return error.SkipZigTest; // TODO