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

ShrinkDemandedOp checks for both isTruncateFree AND isZExtFree but extends with ANY_EXTEND.
llvm · Nov 18, 2023 · 98efa8f · 98efa8f
1 parent 7fd021a
commit 98efa8f
Show file tree

Hide file tree

Showing 2 changed files with 7 additions and 5 deletions.
diff --git 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
@@ -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 {