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[mips] Add comment which explains why we need to change the assembler options before and after inline asm blocks. NFC.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225521 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Toma Tabacu 2015-01-09 15:00:30 +00:00
parent df970d6297
commit bdab504afd
1 changed files with 6 additions and 0 deletions
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6
lib/Target/Mips/MipsAsmPrinter.cpp
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@ -747,6 +747,12 @@ void MipsAsmPrinter::emitInlineAsmStart(
const MCSubtargetInfo &StartInfo) const {
MipsTargetStreamer &TS = getTargetStreamer();
// GCC's choice of assembler options for inline assembly code ('at', 'macro'
// and 'reorder') is different from LLVM's choice for generated code ('noat',
// 'nomacro' and 'noreorder').
// In order to maintain compatibility with inline assembly code which depends
// on GCC's assembler options being used, we have to switch to those options
// for the duration of the inline assembly block and then switch back.
TS.emitDirectiveSetPush();
TS.emitDirectiveSetAt();
TS.emitDirectiveSetMacro();