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Emit code16 in assembly in 16-bit mode

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Summary:
When generating assembly using -m16 we must explicitly mark it as
16-bit. Emit .code16 at beginning of file. Fixes wrong results when
using -fno-integrated-as.

Reviewers: dwmw2

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D19392

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267152 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nirav Dave 2016-04-22 13:36:11 +00:00
parent ad461d6067
commit 3211e2dbdd
2 changed files with 26 additions and 0 deletions
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6
lib/Target/X86/X86AsmPrinter.cpp
View File

@ -538,6 +538,12 @@ void X86AsmPrinter::EmitStartOfAsmFile(Module &M) {
}
}
OutStreamer->EmitSyntaxDirective();
// If this is not inline asm and we're in 16-bit
// mode prefix assembly with .code16.
bool is16 = TT.getEnvironment() == Triple::CODE16;
if (M.getModuleInlineAsm().empty() && is16)
OutStreamer->EmitAssemblerFlag(MCAF_Code16);
}
static void

20
test/CodeGen/X86/x86-16.ll Normal file
View File

@ -0,0 +1,20 @@
; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
target triple = "i386-unknown-linux-code16"
; Function Attrs: nounwind
define i32 @main() #0 {
%retval = alloca i32, align 4
store i32 0, i32* %retval, align 4
ret i32 0
}
; CHECK: .code16
; CHECK-LABEL: main
attributes #0 = { nounwind }
!llvm.ident = !{!0}
!0 = !{!"clang version 3.9.0 (trunk 265439) (llvm/trunk 265567)"}