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No need to look through bitcasts for DbgInfoIntrinsic

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94112 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Victor Hernandez 2010-01-21 23:07:15 +00:00
parent 6c146eefbf
commit a4c77622f7
1 changed files with 6 additions and 13 deletions
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19
lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
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@ -406,12 +406,8 @@ Instruction *InstCombiner::visitStoreInst(StoreInst &SI) {
for (unsigned ScanInsts = 6; BBI != SI.getParent()->begin() && ScanInsts;
--ScanInsts) {
--BBI;
// Don't count debug info directives, lest they affect codegen,
// and we skip pointer-to-pointer bitcasts, which are NOPs.
// It is necessary for correctness to skip those that feed into a
// llvm.dbg.declare, as these are not present when debugging is off.
if (isa<DbgInfoIntrinsic>(BBI) ||
(isa<BitCastInst>(BBI) && isa<PointerType>(BBI->getType()))) {
// Don't count debug info directives, lest they affect codegen
if (isa<DbgInfoIntrinsic>(BBI)) {
ScanInsts++;
continue;
}
@ -475,14 +471,12 @@ Instruction *InstCombiner::visitStoreInst(StoreInst &SI) {
// If this store is the last instruction in the basic block (possibly
// excepting debug info instructions and the pointer bitcasts that feed
// into them), and if the block ends with an unconditional branch, try
// to move it to the successor block.
// excepting debug info instructions), and if the block ends with an
// unconditional branch, try to move it to the successor block.
BBI = &SI;
do {
++BBI;
} while (isa<DbgInfoIntrinsic>(BBI) ||
(isa<BitCastInst>(BBI) && isa<PointerType>(BBI->getType())));
} while (isa<DbgInfoIntrinsic>(BBI));
if (BranchInst *BI = dyn_cast<BranchInst>(BBI))
if (BI->isUnconditional())
if (SimplifyStoreAtEndOfBlock(SI))
@ -542,8 +536,7 @@ bool InstCombiner::SimplifyStoreAtEndOfBlock(StoreInst &SI) {
if (OtherBr->isUnconditional()) {
--BBI;
// Skip over debugging info.
while (isa<DbgInfoIntrinsic>(BBI) ||
(isa<BitCastInst>(BBI) && isa<PointerType>(BBI->getType()))) {
while (isa<DbgInfoIntrinsic>(BBI)) {
if (BBI==OtherBB->begin())
return false;
--BBI;