delete some obviously dead vector operations, which deletes a few thousand
operations from Duraids example.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37582 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 01fcfab..bab6616 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -3245,8 +3245,10 @@
return &I;
} else {
if (ConstantVector *CP = dyn_cast<ConstantVector>(Op1)) {
- if (CP->isAllOnesValue())
+ if (CP->isAllOnesValue()) // X & <-1,-1> -> X
return ReplaceInstUsesWith(I, I.getOperand(0));
+ } else if (isa<ConstantAggregateZero>(Op1)) {
+ return ReplaceInstUsesWith(I, Op1); // X & <0,0> -> <0,0>
}
}
@@ -3714,7 +3716,14 @@
if (SimplifyDemandedBits(&I, APInt::getAllOnesValue(BitWidth),
KnownZero, KnownOne))
return &I;
+ } else if (isa<ConstantAggregateZero>(Op1)) {
+ return ReplaceInstUsesWith(I, Op0); // X | <0,0> -> X
+ } else if (ConstantVector *CP = dyn_cast<ConstantVector>(Op1)) {
+ if (CP->isAllOnesValue()) // X | <-1,-1> -> <-1,-1>
+ return ReplaceInstUsesWith(I, I.getOperand(1));
}
+
+
// or X, -1 == -1
if (ConstantInt *RHS = dyn_cast<ConstantInt>(Op1)) {
@@ -4107,6 +4116,8 @@
if (SimplifyDemandedBits(&I, APInt::getAllOnesValue(BitWidth),
KnownZero, KnownOne))
return &I;
+ } else if (isa<ConstantAggregateZero>(Op1)) {
+ return ReplaceInstUsesWith(I, Op0); // X ^ <0,0> -> X
}
if (ConstantInt *RHS = dyn_cast<ConstantInt>(Op1)) {