Preserve loop metadata when folding branches to a common destination.
Differential Revision: https://reviews.llvm.org/D27830
llvm-svn: 289992
diff --git a/llvm/test/Transforms/LoopSimplify/preserve-llvm-loop-metadata.ll b/llvm/test/Transforms/LoopSimplify/preserve-llvm-loop-metadata.ll
index bd27794..c139760 100644
--- a/llvm/test/Transforms/LoopSimplify/preserve-llvm-loop-metadata.ll
+++ b/llvm/test/Transforms/LoopSimplify/preserve-llvm-loop-metadata.ll
@@ -1,5 +1,6 @@
; RUN: opt -loop-simplify -S < %s | FileCheck %s
+; CHECK-LABEL: @test1
define void @test1(i32 %n) {
entry:
br label %while.cond
@@ -35,6 +36,33 @@
; CHECK: if.else
; CHECK-NOT: br {{.*}}!llvm.loop{{.*}}
+; CHECK-LABEL: @test2
+; CHECK: for.body:
+; CHECK: br i1 %{{.*}}, label %for.body, label %cleanup.loopexit, !llvm.loop !0
+define void @test2(i32 %k) {
+entry:
+ %cmp9 = icmp sgt i32 %k, 0
+ br i1 %cmp9, label %for.body.preheader, label %cleanup
+
+for.body.preheader: ; preds = %entry
+ br label %for.body
+
+for.cond: ; preds = %for.body
+ %cmp = icmp slt i32 %inc, %k
+ br i1 %cmp, label %for.body, label %cleanup.loopexit, !llvm.loop !0
+
+for.body: ; preds = %for.body.preheader, %for.cond
+ %i.010 = phi i32 [ %inc, %for.cond ], [ 0, %for.body.preheader ]
+ %cmp3 = icmp sgt i32 %i.010, 3
+ %inc = add nsw i32 %i.010, 1
+ br i1 %cmp3, label %cleanup.loopexit, label %for.cond
+
+cleanup.loopexit: ; preds = %for.body, %for.cond
+ br label %cleanup
+
+cleanup: ; preds = %cleanup.loopexit, %entry
+ ret void
+}
!0 = distinct !{!0, !1}
!1 = !{!"llvm.loop.distribute.enable", i1 true}