improve validity check to handle constant-trip-count loops more
aggressively. In practice, this doesn't help anything though,
see the todo.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122660 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/LoopIdiom/basic.ll b/test/Transforms/LoopIdiom/basic.ll
index 7f96b3c..ef37b1d 100644
--- a/test/Transforms/LoopIdiom/basic.ll
+++ b/test/Transforms/LoopIdiom/basic.ll
@@ -1,4 +1,4 @@
-; RUN: opt -loop-idiom < %s -S | FileCheck %s
+; RUN: opt -basicaa -loop-idiom < %s -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.0.0"
@@ -65,3 +65,29 @@
; CHECK-NOT: memset
; CHECK: ret void
}
+
+
+;; TODO: We should be able to promote this memset. Not yet though.
+define void @test4(i8* %Base) nounwind ssp {
+bb.nph: ; preds = %entry
+ %Base100 = getelementptr i8* %Base, i64 1000
+ br label %for.body
+
+for.body: ; preds = %bb.nph, %for.body
+ %indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
+ %I.0.014 = getelementptr i8* %Base, i64 %indvar
+ store i8 0, i8* %I.0.014, align 1
+
+ ;; Store beyond the range memset, should be safe to promote.
+ store i8 42, i8* %Base100
+
+ %indvar.next = add i64 %indvar, 1
+ %exitcond = icmp eq i64 %indvar.next, 100
+ br i1 %exitcond, label %for.end, label %for.body
+
+for.end: ; preds = %for.body, %entry
+ ret void
+; CHECK-TODO: @test4
+; CHECK-TODO: call void @llvm.memset.p0i8.i64(i8* %Base, i8 0, i64 100, i32 1, i1 false)
+; CHECK-TODO-NOT: store
+}