[llvm] 98efa8f - [DAG] Fix ShrinkDemandedOp doxygen description to match behaviour. NFC.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2023-11-18T22:44:08Z
New Revision: 98efa8f9aad3e81224d826113620f1cef7708c4a

URL: https://github.com/llvm/llvm-project/commit/98efa8f9aad3e81224d826113620f1cef7708c4a
DIFF: https://github.com/llvm/llvm-project/commit/98efa8f9aad3e81224d826113620f1cef7708c4a.diff

LOG: [DAG] Fix ShrinkDemandedOp doxygen description to match behaviour. NFC.

ShrinkDemandedOp checks for both isTruncateFree AND isZExtFree but extends with ANY_EXTEND.

Added: 
    

Modified: 
    llvm/include/llvm/CodeGen/TargetLowering.h
    llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

Removed: 
    


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diff  --git a/llvm/include/llvm/CodeGen/TargetLowering.h b/llvm/include/llvm/CodeGen/TargetLowering.h
index 862d8a2b3dc48bb..9d5934eeefc686f 100644
--- a/llvm/include/llvm/CodeGen/TargetLowering.h
+++ b/llvm/include/llvm/CodeGen/TargetLowering.h
@@ -3824,9 +3824,10 @@ class TargetLowering : public TargetLoweringBase {
     return false;
   }
 
-  /// Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free.  This
-  /// uses isZExtFree and ZERO_EXTEND for the widening cast, but it could be
-  /// generalized for targets with other types of implicit widening casts.
+  /// Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free.
+  /// This uses isTruncateFree/isZExtFree and ANY_EXTEND for the widening cast,
+  /// but it could be generalized for targets with other types of implicit
+  /// widening casts.
   bool ShrinkDemandedOp(SDValue Op, unsigned BitWidth,
                         const APInt &DemandedBits,
                         TargetLoweringOpt &TLO) const;

diff  --git a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
index 07cebba0937e70c..127c2410985b403 100644
--- a/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
@@ -566,8 +566,9 @@ bool TargetLowering::ShrinkDemandedConstant(SDValue Op,
 }
 
 /// Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the casts are free.
-/// This uses isZExtFree and ZERO_EXTEND for the widening cast, but it could be
-/// generalized for targets with other types of implicit widening casts.
+/// This uses isTruncateFree/isZExtFree and ANY_EXTEND for the widening cast,
+/// but it could be generalized for targets with other types of implicit
+/// widening casts.
 bool TargetLowering::ShrinkDemandedOp(SDValue Op, unsigned BitWidth,
                                       const APInt &DemandedBits,
                                       TargetLoweringOpt &TLO) const {