Fix PR1932 by disabling an xform invalid for fdiv.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46429 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 49f1c45..5ba4857 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -2494,14 +2494,15 @@
if (isa<UndefValue>(Op1))
return ReplaceInstUsesWith(I, Op1);
- // Handle cases involving: div X, (select Cond, Y, Z)
+ // Handle cases involving: [su]div X, (select Cond, Y, Z)
+ // This does not apply for fdiv.
if (SelectInst *SI = dyn_cast<SelectInst>(Op1)) {
- // div X, (Cond ? 0 : Y) -> div X, Y. If the div and the select are in the
- // same basic block, then we replace the select with Y, and the condition
- // of the select with false (if the cond value is in the same BB). If the
- // select has uses other than the div, this allows them to be simplified
- // also. Note that div X, Y is just as good as div X, 0 (undef)
- if (Constant *ST = dyn_cast<Constant>(SI->getOperand(1)))
+ // [su]div X, (Cond ? 0 : Y) -> div X, Y. If the div and the select are in
+ // the same basic block, then we replace the select with Y, and the
+ // condition of the select with false (if the cond value is in the same BB).
+ // If the select has uses other than the div, this allows them to be
+ // simplified also. Note that div X, Y is just as good as div X, 0 (undef)
+ if (ConstantInt *ST = dyn_cast<ConstantInt>(SI->getOperand(1)))
if (ST->isNullValue()) {
Instruction *CondI = dyn_cast<Instruction>(SI->getOperand(0));
if (CondI && CondI->getParent() == I.getParent())
@@ -2513,8 +2514,8 @@
return &I;
}
- // Likewise for: div X, (Cond ? Y : 0) -> div X, Y
- if (Constant *ST = dyn_cast<Constant>(SI->getOperand(2)))
+ // Likewise for: [su]div X, (Cond ? Y : 0) -> div X, Y
+ if (ConstantInt *ST = dyn_cast<ConstantInt>(SI->getOperand(2)))
if (ST->isNullValue()) {
Instruction *CondI = dyn_cast<Instruction>(SI->getOperand(0));
if (CondI && CondI->getParent() == I.getParent())