Remove UnsafeFPMath in visitFSUB

paperchalice · paperchalice · commit 69ac7066ae49 · 2025-06-30T09:30:51.000+08:00
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -17771,7 +17771,7 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) {
     }
   }
 
-  if (((Options.UnsafeFPMath && Options.NoSignedZerosFPMath) ||
+  if ((Options.NoSignedZerosFPMath ||
        (Flags.hasAllowReassociation() && Flags.hasNoSignedZeros())) &&
       N1.getOpcode() == ISD::FADD) {
     // X - (X + Y) -> -Y

Original file line number	Diff line number	Diff line change
`@@ -17771,7 +17771,7 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) {`
`17771`	`17771`	`}`
`17772`	`17772`	`}`
`17773`	`17773`
`17774`		`- if (((Options.UnsafeFPMath && Options.NoSignedZerosFPMath) \|\|`
	`17774`	`+ if ((Options.NoSignedZerosFPMath \|\|`
`17775`	`17775`	`(Flags.hasAllowReassociation() && Flags.hasNoSignedZeros())) &&`
`17776`	`17776`	`N1.getOpcode() == ISD::FADD) {`
`17777`	`17777`	`// X - (X + Y) -> -Y`