fix: Disable VP DAGCombine (redundant with VVP custom FMA combines)

Simon Moll · Simon Moll · commit 0e0d34a20643 · 2022-03-21T16:25:56.000+01:00
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -14089,6 +14089,8 @@ SDValue DAGCombiner::visitFMULForFMADistributiveCombine(SDNode *N) {
 }
 
 SDValue DAGCombiner::visitFADD_VP(SDNode *N) {
+  return SDValue();
+#if 0
   SelectionDAG::FlagInserter FlagsInserter(DAG, N);
 
   // FADD -> FMA combines:
@@ -14097,6 +14099,7 @@ SDValue DAGCombiner::visitFADD_VP(SDNode *N) {
     return Fused;
   }
   return SDValue();
+#endif
 }
 
 SDValue DAGCombiner::visitFADD(SDNode *N) {

Original file line number	Diff line number	Diff line change
`@@ -14089,6 +14089,8 @@ SDValue DAGCombiner::visitFMULForFMADistributiveCombine(SDNode *N) {`
`14089`	`14089`	`}`
`14090`	`14090`
`14091`	`14091`	`SDValue DAGCombiner::visitFADD_VP(SDNode *N) {`
	`14092`	`+ return SDValue();`
	`14093`	`+#if 0`
`14092`	`14094`	`SelectionDAG::FlagInserter FlagsInserter(DAG, N);`
`14093`	`14095`
`14094`	`14096`	`// FADD -> FMA combines:`
`@@ -14097,6 +14099,7 @@ SDValue DAGCombiner::visitFADD_VP(SDNode *N) {`
`14097`	`14099`	`return Fused;`
`14098`	`14100`	`}`
`14099`	`14101`	`return SDValue();`
	`14102`	`+#endif`
`14100`	`14103`	`}`
`14101`	`14104`
`14102`	`14105`	`SDValue DAGCombiner::visitFADD(SDNode *N) {`