getSExtValue() doesn't work for ConstantInts with bitwidth > 64 bits. Use all

APInt calls instead.

This fixes PR3144.

llvm-svn: 60288

1 files changed, 5 insertions, 5 deletions

diff --git a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
index f3cb747e56f..93510f0593f 100644
--- a/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -2957,21 +2957,21 @@ Instruction *InstCombiner::visitSDiv(BinaryOperator &I) {
       return BinaryOperator::CreateNeg(Op0);
 
     ConstantInt *RHSNeg = cast<ConstantInt>(ConstantExpr::getNeg(RHS));
-    APInt RHSNegAPI(RHSNeg->getBitWidth(), RHSNeg->getSExtValue(), true);
+    APInt RHSNegAPI(RHSNeg->getValue());
 
     APInt NegOne = -APInt(RHSNeg->getBitWidth(), 1, true);
     APInt TwoToExp(RHSNeg->getBitWidth(), 1 << (RHSNeg->getBitWidth() - 1));
 
     // -X/C -> X/-C, if and only if negation doesn't overflow.
-    if ((RHS->getSExtValue() < 0 && RHSNegAPI.slt(TwoToExp - 1)) ||
-        (RHS->getSExtValue() > 0 && RHSNegAPI.sgt(TwoToExp * NegOne))) {
+    if ((RHS->getValue().isNegative() && RHSNegAPI.slt(TwoToExp - 1)) ||
+        (RHS->getValue().isNonNegative() && RHSNegAPI.sgt(TwoToExp * NegOne))) {
       if (Value *LHSNeg = dyn_castNegVal(Op0)) {
         if (ConstantInt *CI = dyn_cast<ConstantInt>(LHSNeg)) {
           ConstantInt *CINeg = cast<ConstantInt>(ConstantExpr::getNeg(CI));
           APInt CINegAPI(CINeg->getBitWidth(), CINeg->getSExtValue(), true);
 
-          if ((CI->getSExtValue() < 0 && CINegAPI.slt(TwoToExp - 1)) ||
-              (CI->getSExtValue() > 0 && CINegAPI.sgt(TwoToExp * NegOne)))
+          if ((CI->getValue().isNegative() && CINegAPI.slt(TwoToExp - 1)) ||
+              (CI->getValue().isNonNegative() && CINegAPI.sgt(TwoToExp*NegOne)))
             return BinaryOperator::CreateSDiv(LHSNeg,
                                               ConstantExpr::getNeg(RHS));
         }