[PATCH] D109068: Fix a missing memoryssa update in breakLoopBackedge
Philip Reames via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Sep 1 16:59:22 PDT 2021
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rGc3b3aa277aca: Fix a missing MemorySSA update in breakLoopBackedge (authored by reames).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D109068/new/
https://reviews.llvm.org/D109068
Files:
llvm/lib/Transforms/Utils/LoopUtils.cpp
llvm/test/Transforms/LoopDeletion/bbi-59728.ll
Index: llvm/test/Transforms/LoopDeletion/bbi-59728.ll
===================================================================
--- /dev/null
+++ llvm/test/Transforms/LoopDeletion/bbi-59728.ll
@@ -0,0 +1,27 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt %s -verify-memoryssa -passes='loop-mssa(loop-deletion,loop-simplifycfg)' -S | FileCheck %s
+
+; This is a case where we failed to update memory SSA correctly in
+; loop-deletion which escapes local verification, but causes a crash
+; in loop-simplifycfg.
+define void @func_45() {
+; CHECK-LABEL: @func_45(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: br label [[FOR_BODY45:%.*]]
+; CHECK: for.body45:
+; CHECK-NEXT: store i32 433429641, i32* undef, align 1
+; CHECK-NEXT: br label [[FOR_BODY45]]
+;
+entry:
+ br label %for.body45
+
+for.body45: ; preds = %for.end72, %entry
+ br label %for.body48
+
+for.body48: ; preds = %for.body48, %for.body45
+ store i32 433429641, i32* undef, align 1
+ br i1 undef, label %for.body48, label %for.end72
+
+for.end72: ; preds = %for.body48
+ br label %for.body45
+}
Index: llvm/lib/Transforms/Utils/LoopUtils.cpp
===================================================================
--- llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -729,8 +729,9 @@
// and outer loop so the other target doesn't need to an exit
if (L->isLoopExiting(Latch)) {
// TODO: Generalize ConstantFoldTerminator so that it can be used
- // here without invalidating LCSSA. (Tricky case: header is an exit
- // block of a preceeding sibling loop w/o dedicated exits.)
+ // here without invalidating LCSSA or MemorySSA. (Tricky case for
+ // LCSSA: header is an exit block of a preceeding sibling loop w/o
+ // dedicated exits.)
const unsigned ExitIdx = L->contains(BI->getSuccessor(0)) ? 1 : 0;
BasicBlock *ExitBB = BI->getSuccessor(ExitIdx);
@@ -746,6 +747,8 @@
BI->eraseFromParent();
DTU.applyUpdates({{DominatorTree::Delete, Latch, Header}});
+ if (MSSA)
+ MSSAU->applyUpdates({{DominatorTree::Delete, Latch, Header}}, DT);
return;
}
}
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D109068.370116.patch
Type: text/x-patch
Size: 2345 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20210901/598ee271/attachment.bin>
More information about the llvm-commits
mailing list