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| author | Chris Lattner <sabre@nondot.org> | 2004-04-14 03:28:36 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2004-04-14 03:28:36 +0000 |
| commit | 6679e46b592fb8a9976b88b8e2ea35d829c00339 (patch) | |
| tree | 3402bcda2a3cab5ba92655f6f9c9cb728cea8042 /llvm/lib | |
| parent | 0dc099c2b52de20f8dffd1e0bfa7b16c250efa34 (diff) | |
| download | bcm5719-llvm-6679e46b592fb8a9976b88b8e2ea35d829c00339.tar.gz bcm5719-llvm-6679e46b592fb8a9976b88b8e2ea35d829c00339.zip | |
ADd a trivial instcombine: load null -> null
llvm-svn: 12940
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/InstructionCombining.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp index af85c5fdde9..fe13a6ba540 100644 --- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp @@ -2853,8 +2853,11 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) { Value *Op = LI.getOperand(0); if (LI.isVolatile()) return 0; - if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(Op)) - Op = CPR->getValue(); + if (Constant *C = dyn_cast<Constant>(Op)) + if (C->isNullValue()) // load null -> 0 + return ReplaceInstUsesWith(LI, Constant::getNullValue(LI.getType())); + else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C)) + Op = CPR->getValue(); // Instcombine load (constant global) into the value loaded... if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op)) |
