Expand this test to handle more cases (remainder and shifts) of zero.
llvm-svn: 73839
diff --git a/llvm/lib/VMCore/ConstantFold.cpp b/llvm/lib/VMCore/ConstantFold.cpp
index dc8fb39..3aab0cc 100644
--- a/llvm/lib/VMCore/ConstantFold.cpp
+++ b/llvm/lib/VMCore/ConstantFold.cpp
@@ -629,7 +629,7 @@
}
}
- // Handle simplifications of the RHS when a constant int.
+ // Handle simplifications when the RHS is a constant int.
if (const ConstantInt *CI2 = dyn_cast<ConstantInt>(C2)) {
switch (Opcode) {
case Instruction::Add:
@@ -773,13 +773,20 @@
}
}
}
-
- // 0 / x -> 0.
- if ((Opcode == Instruction::UDiv ||
- Opcode == Instruction::SDiv) &&
- CI1->isZero())
- return const_cast<Constant*>(C1);
-
+
+ switch (Opcode) {
+ case Instruction::SDiv:
+ case Instruction::UDiv:
+ case Instruction::URem:
+ case Instruction::SRem:
+ case Instruction::LShr:
+ case Instruction::AShr:
+ case Instruction::Shl:
+ if (CI1->equalsInt(0)) return const_cast<Constant*>(C1);
+ break;
+ default:
+ break;
+ }
} else if (const ConstantFP *CFP1 = dyn_cast<ConstantFP>(C1)) {
if (const ConstantFP *CFP2 = dyn_cast<ConstantFP>(C2)) {
APFloat C1V = CFP1->getValueAPF();