Changes in directory llvm/lib/Transforms/Scalar:
InstructionCombining.cpp updated: 1.597 -> 1.598 --- Log message: delete stores to allocas with one use. This is a trivial form of DSE which often kicks in for ?: expressions. --- Diffs of the changes: (+18 -0) InstructionCombining.cpp | 18 ++++++++++++++++++ 1 files changed, 18 insertions(+) Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.597 llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.598 --- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.597 Sun Jan 14 20:27:26 2007 +++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp Mon Jan 15 00:51:56 2007 @@ -8237,6 +8237,24 @@ ++NumCombined; return 0; } + + // If the RHS is an alloca with a single use, zapify the store, making the + // alloca dead. + if (Ptr->hasOneUse()) { + if (isa<AllocaInst>(Ptr)) { + EraseInstFromFunction(SI); + ++NumCombined; + return 0; + } + + if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr)) + if (isa<AllocaInst>(GEP->getOperand(0)) && + GEP->getOperand(0)->hasOneUse()) { + EraseInstFromFunction(SI); + ++NumCombined; + return 0; + } + } // Do really simple DSE, to catch cases where there are several consequtive // stores to the same location, separated by a few arithmetic operations. This _______________________________________________ llvm-commits mailing list llvm-commits@cs.uiuc.edu http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits