// memory (without proving that the loop doesn't write).
if (L->hasLoopInvariantOperands(Inst) &&
!Inst->mayReadFromMemory() && !Inst->mayWriteToMemory() &&
- !isa<TerminatorInst>(Inst) && !isa<DbgInfoIntrinsic>(Inst)) {
+ !isa<TerminatorInst>(Inst) && !isa<DbgInfoIntrinsic>(Inst) &&
+ !isa<AllocaInst>(Inst)) {
Inst->moveBefore(LoopEntryBranch);
continue;
}
--- /dev/null
+; RUN: opt < %s -loop-rotate -S | FileCheck %s
+
+; Test alloca in -loop-rotate.
+
+; We expect a different value for %ptr each iteration (according to the
+; definition of alloca). I.e. each @use must be paired with an alloca.
+
+; CHECK: call void @use(i8* %
+; CHECK: %ptr = alloca i8
+
+@e = global i16 10
+
+declare void @use(i8*)
+
+define void @test() {
+entry:
+ %end = load i16* @e
+ br label %loop
+
+loop:
+ %n.phi = phi i16 [ %n, %loop.fin ], [ 0, %entry ]
+ %ptr = alloca i8
+ %cond = icmp eq i16 %n.phi, %end
+ br i1 %cond, label %exit, label %loop.fin
+
+loop.fin:
+ %n = add i16 %n.phi, 1
+ call void @use(i8* %ptr)
+ br label %loop
+
+exit:
+ ret void
+}