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stage1: override f80 alignment for i386-windows

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Comment reproduced here:

Note the following u64 alignments:
  x86-linux:   4
  x86-windows: 8
LLVM makes x86_fp80 have the following alignment and sizes regardless
of operating system:
  x86_64: size=16, align=16
  x86:    size=12, align=4
However in Zig we override x86-windows to have size=16, align=16
in order for the property to hold that u80 and f80 have the same ABI size.

Fixes "error: destination type 'f80' has size 12 but source type 'u80'
has size 16" when trying to bitcast between f80 and u80 on i386-windows.
This commit is contained in:
Andrew Kelley 2022-02-10 23:51:09 -07:00 committed by Jakub Konka
parent d72f832b1e
commit b92e1ab8cc
1 changed files with 29 additions and 18 deletions
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47
src/stage1/codegen.cpp
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@ -9432,29 +9432,40 @@ static void define_builtin_types(CodeGen *g) {
buf_init_from_str(&entry->name, "f80");
entry->data.floating.bit_count = 80;
switch (g->zig_target->arch) {
case ZigLLVM_x86_64:
entry->llvm_type = LLVMX86FP80Type();
if (target_has_f80(g->zig_target)) {
entry->llvm_type = LLVMX86FP80Type();
// Note the following u64 alignments:
// x86-linux: 4
// x86-windows: 8
// LLVM makes x86_fp80 have the following alignment and sizes regardless
// of operating system:
// x86_64: size=16, align=16
// x86: size=12, align=4
// However in Zig we override x86-windows to have size=16, align=16
// in order for the property to hold that u80 and f80 have the same ABI size.
unsigned u64_alignment = LLVMABIAlignmentOfType(g->target_data_ref, LLVMInt64Type());
if (u64_alignment >= 8) {
entry->abi_size = 16;
entry->abi_align = 16;
break;
case ZigLLVM_x86:
entry->llvm_type = LLVMX86FP80Type();
} else if (u64_alignment >= 4) {
entry->abi_size = 12;
entry->abi_align = 4;
break;
default: {
// We use an int here instead of x86_fp80 because on targets such as arm,
// LLVM will give "ERROR: Cannot select" for any instructions involving
// the x86_fp80 type.
ZigType *u80_ty = get_int_type(g, false, 80);
assert(!target_has_f80(g->zig_target));
assert(u80_ty->size_in_bits == entry->size_in_bits);
entry->llvm_type = get_llvm_type(g, u80_ty);
entry->abi_size = u80_ty->abi_size;
entry->abi_align = u80_ty->abi_align;
break;
} else {
entry->abi_size = 10;
entry->abi_align = u64_alignment;
}
} else {
// We use an int here instead of x86_fp80 because on targets such as arm,
// LLVM will give "ERROR: Cannot select" for any instructions involving
// the x86_fp80 type.
ZigType *u80_ty = get_int_type(g, false, 80);
assert(!target_has_f80(g->zig_target));
assert(u80_ty->size_in_bits == entry->size_in_bits);
entry->llvm_type = get_llvm_type(g, u80_ty);
entry->abi_size = u80_ty->abi_size;
entry->abi_align = u80_ty->abi_align;
}
entry->llvm_di_type = ZigLLVMCreateDebugBasicType(g->dbuilder, buf_ptr(&entry->name),