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author | Hal Finkel <hfinkel@anl.gov> | 2013-05-18 09:20:39 +0000 |
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committer | Hal Finkel <hfinkel@anl.gov> | 2013-05-18 09:20:39 +0000 |
commit | bf0bc3b2a2e11ff7e79b881ca82324fe17919a97 (patch) | |
tree | d954a0523b7bedfa4720f460641dd06691eb9fcb /lib/Target/PowerPC/PPCCTRLoops.cpp | |
parent | 9f61e485e6c4a6763695ab399ff61567271836df (diff) | |
download | llvm-bf0bc3b2a2e11ff7e79b881ca82324fe17919a97.tar.gz llvm-bf0bc3b2a2e11ff7e79b881ca82324fe17919a97.tar.bz2 llvm-bf0bc3b2a2e11ff7e79b881ca82324fe17919a97.tar.xz |
Check InlineAsm clobbers in PPCCTRLoops
We don't need to reject all inline asm as using the counter register (most does
not). Only those that explicitly clobber the counter register need to prevent
the transformation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182191 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/PowerPC/PPCCTRLoops.cpp')
-rw-r--r-- | lib/Target/PowerPC/PPCCTRLoops.cpp | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCCTRLoops.cpp b/lib/Target/PowerPC/PPCCTRLoops.cpp index 5d001fc072..e8760dedea 100644 --- a/lib/Target/PowerPC/PPCCTRLoops.cpp +++ b/lib/Target/PowerPC/PPCCTRLoops.cpp @@ -33,6 +33,7 @@ #include "llvm/Analysis/ScalarEvolutionExpander.h" #include "llvm/IR/Constants.h" #include "llvm/IR/DerivedTypes.h" +#include "llvm/IR/InlineAsm.h" #include "llvm/IR/Instructions.h" #include "llvm/IR/IntrinsicInst.h" #include "llvm/IR/Module.h" @@ -148,6 +149,20 @@ bool PPCCTRLoops::mightUseCTR(const Triple &TT, BasicBlock *BB) { for (BasicBlock::iterator J = BB->begin(), JE = BB->end(); J != JE; ++J) { if (CallInst *CI = dyn_cast<CallInst>(J)) { + if (InlineAsm *IA = dyn_cast<InlineAsm>(CI->getCalledValue())) { + // Inline ASM is okay, unless it clobbers the ctr register. + InlineAsm::ConstraintInfoVector CIV = IA->ParseConstraints(); + for (unsigned i = 0, ie = CIV.size(); i < ie; ++i) { + InlineAsm::ConstraintInfo &C = CIV[i]; + if (C.Type != InlineAsm::isInput) + for (unsigned j = 0, je = C.Codes.size(); j < je; ++j) + if (StringRef(C.Codes[j]).equals_lower("{ctr}")) + return true; + } + + continue; + } + if (!TM) return true; const TargetLowering *TLI = TM->getTargetLowering(); |