Make all the vector elements positive in an srem of constant vector.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61195 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 4914c11..8d54e0c 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -3089,6 +3089,29 @@
}
}
+ // If it's a constant vector, flip any negative values positive.
+ if (isa<VectorType>(I.getType())) {
+ if (ConstantVector *RHSV = dyn_cast<ConstantVector>(Op1)) {
+ unsigned VWidth = RHSV->getNumOperands();
+ std::vector<Constant *> Elts(VWidth);
+
+ for (unsigned i = 0; i != VWidth; ++i) {
+ if (ConstantInt *RHS = dyn_cast<ConstantInt>(RHSV->getOperand(i))) {
+ if (RHS->getValue().isNegative())
+ Elts[i] = cast<ConstantInt>(ConstantExpr::getNeg(RHS));
+ else
+ Elts[i] = RHS;
+ }
+ }
+
+ Constant *NewRHSV = ConstantVector::get(Elts);
+ if (NewRHSV != RHSV) {
+ I.setOperand(1, NewRHSV);
+ return &I;
+ }
+ }
+ }
+
return 0;
}