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author | Chris Lattner <sabre@nondot.org> | 2003-10-07 22:54:13 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2003-10-07 22:54:13 +0000 |
commit | 6c266db54cb2a3ddcce49ce8cc8c334292d58a3a (patch) | |
tree | 4dfa3dd8acdc4f5292e35d6847332d9a9b4d5a77 /lib/Transforms | |
parent | d1c5ea1071bc2f794974bf1f4720d262fe668550 (diff) | |
download | llvm-6c266db54cb2a3ddcce49ce8cc8c334292d58a3a.tar.gz llvm-6c266db54cb2a3ddcce49ce8cc8c334292d58a3a.tar.bz2 llvm-6c266db54cb2a3ddcce49ce8cc8c334292d58a3a.tar.xz |
Fix bug: InstCombine/cast.ll:test11 / PR#7
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8954 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms')
-rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index b31ec635c8..8188929cd5 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -1607,10 +1607,32 @@ static const Type *getPromotedType(const Type *Ty) { // visitCallSite - Improvements for call and invoke instructions. // Instruction *InstCombiner::visitCallSite(CallSite CS) { + bool Changed = false; + + // If the callee is a constexpr cast of a function, attempt to move the cast + // to the arguments of the call/invoke. if (transformConstExprCastCall(CS)) return 0; + Value *Callee = CS.getCalledValue(); + const PointerType *PTy = cast<PointerType>(Callee->getType()); + const FunctionType *FTy = cast<FunctionType>(PTy->getElementType()); + if (FTy->isVarArg()) { + // See if we can optimize any arguments passed through the varargs area of + // the call. + for (CallSite::arg_iterator I = CS.arg_begin()+FTy->getNumParams(), + E = CS.arg_end(); I != E; ++I) + if (CastInst *CI = dyn_cast<CastInst>(*I)) { + // If this cast does not effect the value passed through the varargs + // area, we can eliminate the use of the cast. + Value *Op = CI->getOperand(0); + if (CI->getType()->isLosslesslyConvertibleTo(Op->getType())) { + *I = Op; + Changed = true; + } + } + } - return 0; + return Changed ? CS.getInstruction() : 0; } // transformConstExprCastCall - If the callee is a constexpr cast of a function, |