[LoopUnswitch] Preserve make.implicit metadata for unswitched conditions
Summary: This patch adds support to preserve make.implicit metadata for unswitched conditions in loop pre-header.
Reviewers: sanjoy, weimingz
Subscribers: mcrosier, llvm-commits
Differential Revision: http://reviews.llvm.org/D11769
llvm-svn: 244132
diff --git a/llvm/test/Transforms/LoopUnswitch/copy-metadata.ll b/llvm/test/Transforms/LoopUnswitch/copy-metadata.ll
new file mode 100644
index 0000000..2a634c2
--- /dev/null
+++ b/llvm/test/Transforms/LoopUnswitch/copy-metadata.ll
@@ -0,0 +1,23 @@
+; RUN: opt < %s -loop-unswitch -S < %s 2>&1 | FileCheck %s
+
+; This test checks if unswitched condition preserve make.implicit metadata.
+
+define i32 @test(i1 %cond) {
+; CHECK: br i1 %cond, label %..split_crit_edge, label %.loop_exit.split_crit_edge, !make.implicit !0
+ br label %loop_begin
+
+loop_begin:
+; CHECK: br i1 true, label %continue, label %loop_exit, !make.implicit !0
+ br i1 %cond, label %continue, label %loop_exit, !make.implicit !0
+
+continue:
+ call void @some_func()
+ br label %loop_begin
+
+loop_exit:
+ ret i32 0
+}
+
+declare void @some_func()
+
+!0 = !{}