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[ms-inline asm] Make the comment a bit more verbose. 

llvm-svn: 175641
This commit is contained in:
Chad Rosier 2013-02-20 18:03:44 +00:00
parent 14a32d8682
commit a018cfd10c
1 changed files with 6 additions and 2 deletions
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8
llvm/lib/Target/X86/X86RegisterInfo.cpp
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@ -389,8 +389,12 @@ bool X86RegisterInfo::hasBasePointer(const MachineFunction &MF) const {
return false;
// When we need stack realignment and there are dynamic allocas, we can't
// reference off of the stack pointer, so we reserve a base pointer. This
// is also true if the function contain MS-style inline assembly.
// reference off of the stack pointer, so we reserve a base pointer.
//
// This is also true if the function contain MS-style inline assembly. We
// do this because if any stack changes occur in the inline assembly, e.g.,
// "pusha", then any C local variable or C argument references in the
// inline assembly will be wrong because the SP is not properly tracked.
if ((needsStackRealignment(MF) && MFI->hasVarSizedObjects()) ||
MF.hasMSInlineAsm())
return true;