Remove UnsafeFPMath in visitFSUB

paperchalice · paperchalice · commit e9de25862b04 · 2025-07-25T08:28:13.000+08:00
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -17822,7 +17822,7 @@ 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
`@@ -17822,7 +17822,7 @@ SDValue DAGCombiner::visitFSUB(SDNode *N) {`
`17822`	`17822`	`}`
`17823`	`17823`	`}`
`17824`	`17824`
`17825`		`- if (((Options.UnsafeFPMath && Options.NoSignedZerosFPMath) \|\|`
	`17825`	`+ if ((Options.NoSignedZerosFPMath \|\|`
`17826`	`17826`	`(Flags.hasAllowReassociation() && Flags.hasNoSignedZeros())) &&`
`17827`	`17827`	`N1.getOpcode() == ISD::FADD) {`
`17828`	`17828`	`// X - (X + Y) -> -Y`