[llvm] [TableGen][SubtargetEmitter] Early exit from loop in FindWriteResources and FindReadAdvance (PR #92202)

[Craig Topper via llvm-commits]

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@@ -956,8 +962,14 @@ Record *SubtargetEmitter::FindReadAdvance(const CodeGenSchedRW &SchedRead,
   for (Record *RA : ProcModel.ReadAdvanceDefs) {
     if (!RA->isSubClassOf("ReadAdvance"))
       continue;
-    if (AliasDef == RA->getValueAsDef("ReadType") ||
-        SchedRead.TheDef == RA->getValueAsDef("ReadType")) {
+    // If there is no AliasDef and we find a match, we can early exit since
+    // there is no need to verify whether there are resources defined for both
+    // SchedWrite and its alias.
+    if (!AliasDef && AliasDef == RA->getValueAsDef("ReadType")) {
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topperc wrote:

Cache RA->getValueAsDef("ReadType")

https://github.com/llvm/llvm-project/pull/92202