Revert LLVM change that causes overly aggressive optimizations when

schweitzpgi · schweitzpgi · commit f26eb3181475 · 2018-03-20T16:06:57.000-07:00
using the Fortran overloaded TBAA annotations.
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -1386,7 +1386,7 @@ AliasResult BasicAAResult::aliasGEP(const GEPOperator *GEP1, uint64_t V1Size,
   // Statically, we can see that the base objects are the same, but the
   // pointers have dynamic offsets which we can't resolve. And none of our
   // little tricks above worked.
-  return MayAlias;
+  return PartialAlias;
 }
 
 static AliasResult MergeAliasResults(AliasResult A, AliasResult B) {

Original file line number	Diff line number	Diff line change
`@@ -1386,7 +1386,7 @@ AliasResult BasicAAResult::aliasGEP(const GEPOperator *GEP1, uint64_t V1Size,`
`1386`	`1386`	`// Statically, we can see that the base objects are the same, but the`
`1387`	`1387`	`// pointers have dynamic offsets which we can't resolve. And none of our`
`1388`	`1388`	`// little tricks above worked.`
`1389`		`- return MayAlias;`
	`1389`	`+ return PartialAlias;`
`1390`	`1390`	`}`
`1391`	`1391`
`1392`	`1392`	`static AliasResult MergeAliasResults(AliasResult A, AliasResult B) {`