[llvm] 0985a8b - Fix left shift overflow UB in PPC backend on LLP64 platforms

[Reid Kleckner via llvm-commits]

Author: Reid Kleckner
Date: 2020-12-19T17:46:09-08:00
New Revision: 0985a8bfea46272561d2a261b10f308a5841f18a

URL: https://github.com/llvm/llvm-project/commit/0985a8bfea46272561d2a261b10f308a5841f18a
DIFF: https://github.com/llvm/llvm-project/commit/0985a8bfea46272561d2a261b10f308a5841f18a.diff

LOG: Fix left shift overflow UB in PPC backend on LLP64 platforms

Added: 
    

Modified: 
    llvm/lib/Target/PowerPC/PPCISelLowering.cpp

Removed: 
    


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diff  --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 3d9a54305cc6..18e35f5a0850 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -9189,7 +9189,7 @@ static SDValue getCanonicalConstSplat(uint64_t Val, unsigned SplatSize, EVT VT,
   EVT ReqVT = VT != MVT::Other ? VT : VTys[SplatSize-1];
 
   // For a splat with all ones, turn it to vspltisb 0xFF to canonicalize.
-  if (Val == ((1LU << (SplatSize * 8)) - 1)) {
+  if (Val == ((1LLU << (SplatSize * 8)) - 1)) {
     SplatSize = 1;
     Val = 0xFF;
   }