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stage1: Add architecture-specific clobbers to asm()

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We're basically following Clang's lead, add the necessary clobbers to
minimize the risk of generating wrong code.
This commit is contained in:
LemonBoy 2020-11-12 10:16:57 +01:00 committed by Veikka Tuominen
parent 1e1a490600
commit bef140c0a2
1 changed files with 23 additions and 0 deletions
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23
src/stage1/codegen.cpp
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@ -4838,6 +4838,29 @@ static LLVMValueRef ir_render_asm_gen(CodeGen *g, IrExecutableGen *executable, I
}
}
// Add some architecture-specific clobbers.
const char *arch_clobbers = nullptr;
switch (g->zig_target->arch) {
case ZigLLVM_x86:
case ZigLLVM_x86_64:
arch_clobbers = "~{dirflag},~{fpsr},~{flags}";
break;
case ZigLLVM_mips:
case ZigLLVM_mipsel:
case ZigLLVM_mips64:
case ZigLLVM_mips64el:
arch_clobbers = "~{$1}";
break;
default:
break;
}
if (arch_clobbers != nullptr) {
if (buf_len(&constraint_buf))
buf_append_char(&constraint_buf, ',');
buf_append_str(&constraint_buf, arch_clobbers);
}
LLVMTypeRef ret_type;
if (instruction->return_count == 0) {
ret_type = LLVMVoidType();