diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 2 | ||||
| -rw-r--r-- | test/CodeGen/X86/2009-05-28-DAGCombineCrash.ll | 38 |
2 files changed, 40 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 3bc9cf0..4c1710d 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -4937,6 +4937,8 @@ SDValue DAGCombiner::ReduceLoadOpStoreWidth(SDNode *N) { APInt Imm = cast<ConstantSDNode>(N1)->getAPIntValue(); if (Opc == ISD::AND) Imm ^= APInt::getAllOnesValue(BitWidth); + if (Imm == 0 || Imm.isAllOnesValue()) + return SDValue(); unsigned ShAmt = Imm.countTrailingZeros(); unsigned MSB = BitWidth - Imm.countLeadingZeros() - 1; unsigned NewBW = NextPowerOf2(MSB - ShAmt); diff --git a/test/CodeGen/X86/2009-05-28-DAGCombineCrash.ll b/test/CodeGen/X86/2009-05-28-DAGCombineCrash.ll new file mode 100644 index 0000000..7bdfcb3 --- /dev/null +++ b/test/CodeGen/X86/2009-05-28-DAGCombineCrash.ll @@ -0,0 +1,38 @@ +; RUN: llvm-as < %s | llc -march=x86-64 + + %struct.tempsym_t = type { i8*, i8*, i8*, i8*, i32, i32, i32, i32, i32 } + +define fastcc signext i8 @S_next_symbol(%struct.tempsym_t* %symptr) nounwind ssp { +entry: + br label %bb116 + +bb: ; preds = %bb116 + switch i8 undef, label %bb14 [ + i8 9, label %bb116 + i8 32, label %bb116 + i8 10, label %bb116 + i8 13, label %bb116 + i8 12, label %bb116 + ] + +bb14: ; preds = %bb + br i1 undef, label %bb75, label %bb115 + +bb75: ; preds = %bb14 + %srcval16 = load i448* null, align 8 ; <i448> [#uses=1] + %tmp = zext i32 undef to i448 ; <i448> [#uses=1] + %tmp15 = shl i448 %tmp, 288 ; <i448> [#uses=1] + %mask = and i448 %srcval16, -2135987035423586845985235064014169866455883682256196619149693890381755748887481053010428711403521 ; <i448> [#uses=1] + %ins = or i448 %tmp15, %mask ; <i448> [#uses=1] + store i448 %ins, i448* null, align 8 + ret i8 1 + +bb115: ; preds = %bb14 + ret i8 1 + +bb116: ; preds = %bb, %bb, %bb, %bb, %bb, %entry + br i1 undef, label %bb, label %bb117 + +bb117: ; preds = %bb116 + ret i8 0 +} |