[llvm] 306ff74 - [SelectionDAG] Use APInt::zextOrSelf instead of zextOrTrunc in ComputePHILiveOutRegInfo

[Craig Topper via llvm-commits]

Author: Craig Topper
Date: 2022-03-18T23:26:19-07:00
New Revision: 306ff74154c76975331116143adfc6ab1c6dea3f

URL: https://github.com/llvm/llvm-project/commit/306ff74154c76975331116143adfc6ab1c6dea3f
DIFF: https://github.com/llvm/llvm-project/commit/306ff74154c76975331116143adfc6ab1c6dea3f.diff

LOG: [SelectionDAG] Use APInt::zextOrSelf instead of zextOrTrunc in ComputePHILiveOutRegInfo

The width never decreases here.

Added: 
    

Modified: 
    llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
index a8381a7ce3fde..771e09d9c3a25 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
@@ -459,7 +459,7 @@ void FunctionLoweringInfo::ComputePHILiveOutRegInfo(const PHINode *PN) {
   }
 
   if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
-    APInt Val = CI->getValue().zextOrTrunc(BitWidth);
+    APInt Val = CI->getValue().zextOrSelf(BitWidth);
     DestLOI.NumSignBits = Val.getNumSignBits();
     DestLOI.Known = KnownBits::makeConstant(Val);
   } else {
@@ -491,7 +491,7 @@ void FunctionLoweringInfo::ComputePHILiveOutRegInfo(const PHINode *PN) {
     }
 
     if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
-      APInt Val = CI->getValue().zextOrTrunc(BitWidth);
+      APInt Val = CI->getValue().zextOrSelf(BitWidth);
       DestLOI.NumSignBits = std::min(DestLOI.NumSignBits, Val.getNumSignBits());
       DestLOI.Known.Zero &= ~Val;
       DestLOI.Known.One &= Val;