[CopyPropagation] Note ShrinkBorrowScope changes.

nate-chandler · nate-chandler · commit 646dc136fcfa · 2021-12-07T17:04:49.000-08:00
Use the result returned from shrinkgBorrowScope to update the changed
flag.
diff --git a/lib/SILOptimizer/Transforms/CopyPropagation.cpp b/lib/SILOptimizer/Transforms/CopyPropagation.cpp
@@ -438,7 +438,7 @@ void CopyPropagation::run() {
   //       blocks and pushing begin_borrows as we see them and then popping them
   //       off the end will result in shrinking inner borrow scopes first.
   while (auto *bbi = beginBorrowsToShrink.pop()) {
-    shrinkBorrowScope(bbi, deleter);
+    changed |= shrinkBorrowScope(bbi, deleter);
   }
 
   // canonicalizer performs all modifications through deleter's callbacks, so we

Original file line number	Diff line number	Diff line change
`@@ -438,7 +438,7 @@ void CopyPropagation::run() {`
`438`	`438`	`// blocks and pushing begin_borrows as we see them and then popping them`
`439`	`439`	`// off the end will result in shrinking inner borrow scopes first.`
`440`	`440`	`while (auto *bbi = beginBorrowsToShrink.pop()) {`
`441`		`- shrinkBorrowScope(bbi, deleter);`
	`441`	`+ changed \|= shrinkBorrowScope(bbi, deleter);`
`442`	`442`	`}`
`443`	`443`
`444`	`444`	`// canonicalizer performs all modifications through deleter's callbacks, so we`