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Don't count DebugInfo instructions in another limit

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(lest they affect codegen).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65915 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2009-03-03 01:43:03 +00:00
parent 1d62705847
commit acb51a3037
1 changed files with 7 additions and 1 deletions
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8
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -11439,12 +11439,18 @@ Instruction *InstCombiner::visitStoreInst(StoreInst &SI) {
SI.getAlignment()))
SI.setAlignment(KnownAlign);
// Do really simple DSE, to catch cases where there are several consequtive
// Do really simple DSE, to catch cases where there are several consecutive
// stores to the same location, separated by a few arithmetic operations. This
// situation often occurs with bitfield accesses.
BasicBlock::iterator BBI = &SI;
for (unsigned ScanInsts = 6; BBI != SI.getParent()->begin() && ScanInsts;
--ScanInsts) {
// Don't count debug info directives, lest they affect codegen.
if (isa<DbgInfoIntrinsic>(BBI)) {
ScanInsts++;
--BBI;
continue;
}
--BBI;
if (StoreInst *PrevSI = dyn_cast<StoreInst>(BBI)) {