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remove some dead code, this is handled by constant folding. 

llvm-svn: 41819
This commit is contained in:
Chris Lattner 2007-09-10 23:46:29 +00:00
parent 52fe869374
commit e804567cd8
1 changed files with 1 additions and 8 deletions
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9
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -4691,14 +4691,6 @@ Instruction *InstCombiner::visitICmpInst(ICmpInst &I) {
if (isa<UndefValue>(Op1)) // X icmp undef -> undef
return ReplaceInstUsesWith(I, UndefValue::get(Type::Int1Ty));
// icmp of GlobalValues can never equal each other as long as they aren't
// external weak linkage type.
if (GlobalValue *GV0 = dyn_cast<GlobalValue>(Op0))
if (GlobalValue *GV1 = dyn_cast<GlobalValue>(Op1))
if (!GV0->hasExternalWeakLinkage() || !GV1->hasExternalWeakLinkage())
return ReplaceInstUsesWith(I, ConstantInt::get(Type::Int1Ty,
!isTrueWhenEqual(I)));
// icmp <global/alloca*/null>, <global/alloca*/null> - Global/Stack value
// addresses never equal each other! We already know that Op0 != Op1.
if ((isa<GlobalValue>(Op0) || isa<AllocaInst>(Op0) ||
@ -6399,6 +6391,7 @@ static bool CanEvaluateInDifferentType(Value *V, const IntegerType *Ty,
// of casts in the input.
if (I->getOpcode() == CastOpc)
return true;
break;
default:
// TODO: Can handle more cases here.