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[ms-inline-asm] Leave alignment in bytes if the native assembler uses bytes

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The existing behavior was correct on Darwin, which is probably the
platform it was written for.

Before this change, we would rewrite "align 8" to ".align 3" and then
fail to make it through the integrated assembler because 3 is not a
power of 2.

Differential Revision: http://reviews.llvm.org/D14120

llvm-svn: 251418
This commit is contained in:
Reid Kleckner 2015-10-27 17:32:48 +00:00
parent 6b448f7f95
commit 9057466943
1 changed files with 9 additions and 3 deletions
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12
lib/MC/MCParser/AsmParser.cpp
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@ -4792,10 +4792,16 @@ bool AsmParser::parseMSInlineAsm(
OS << ".byte";
break;
case AOK_Align: {
unsigned Val = AR.Val;
OS << ".align " << Val;
// MS alignment directives are measured in bytes. If the native assembler
// measures alignment in bytes, we can pass it straight through.
OS << ".align";
if (getContext().getAsmInfo()->getAlignmentIsInBytes())
break;
// Skip the original immediate.
// Alignment is in log2 form, so print that instead and skip the original
// immediate.
unsigned Val = AR.Val;
OS << ' ' << Val;
assert(Val < 10 && "Expected alignment less then 2^10.");
AdditionalSkip = (Val < 4) ? 2 : Val < 7 ? 3 : 4;
break;