[InstCombine] fix miscompile of frem with 0.0 operand (PR34870)

We might want to select NAN here or do this transform with fast-math,
but this should at least fix the miscompile.

llvm-svn: 321461

1 files changed, 0 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
index 87666360c1a..541dde6c47d 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
@@ -1631,9 +1631,5 @@ Instruction *InstCombiner::visitFRem(BinaryOperator &I) {
                                   SQ.getWithInstruction(&I)))
     return replaceInstUsesWith(I, V);
 
-  // Handle cases involving: rem X, (select Cond, Y, Z)
-  if (simplifyDivRemOfSelectWithZeroOp(I))
-    return &I;
-
   return nullptr;
 }