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Work around a GCC bug, producing this code:

Browse Source 
unsigned char *llvm_cbe_X;
...
  llvm_cbe_X = 0; *((void**)&llvm_cbe_X) = __builtin_stack_save();

instead of:

  llvm_cbe_X = __builtin_stack_save();

See PR1809 for details.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44415 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-11-28 21:26:17 +00:00
parent 51c971701a
commit 4045e6db8c
1 changed files with 6 additions and 0 deletions
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6
lib/Target/CBackend/CBackend.cpp
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@ -2573,6 +2573,12 @@ void CWriter::visitCallInst(CallInst &I) {
writeOperand(I.getOperand(3));
Out << ")";
return;
case Intrinsic::stacksave:
// Emit this as: Val = 0; *((void**)&Val) = __builtin_stack_save()
// to work around GCC bugs (see PR1809).
Out << "0; *((void**)&" << GetValueName(&I)
<< ") = __builtin_stack_save()";
return;
case Intrinsic::dbg_stoppoint: {
// If we use writeOperand directly we get a "u" suffix which is rejected
// by gcc.