// 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);
BI->eraseFromParent();
DTU.applyUpdates({{DominatorTree::Delete, Latch, Header}});
+ if (MSSA)
+ MSSAU->applyUpdates({{DominatorTree::Delete, Latch, Header}}, DT);
return;
}
}
--- /dev/null
+; 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
+}