[llvm] r244132 - [LoopUnswitch] Preserve make.implicit metadata for unswitched conditions

[Chen Li]

Author: chenli
Date: Wed Aug  5 16:13:26 2015
New Revision: 244132

URL: http://llvm.org/viewvc/llvm-project?rev=244132&view=rev
Log:
[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

Added:
    llvm/trunk/test/Transforms/LoopUnswitch/copy-metadata.ll
Modified:
    llvm/trunk/lib/Transforms/Scalar/LoopUnswitch.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/LoopUnswitch.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopUnswitch.cpp?rev=244132&r1=244131&r2=244132&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/LoopUnswitch.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/LoopUnswitch.cpp Wed Aug  5 16:13:26 2015
@@ -657,6 +657,7 @@ static void copyMetadata(Instruction *Ds
         }
       }
       // fallthrough.
+    case LLVMContext::MD_make_implicit:
     case LLVMContext::MD_dbg:
       DstInst->setMetadata(MD.first, MD.second);
     }

Added: llvm/trunk/test/Transforms/LoopUnswitch/copy-metadata.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/LoopUnswitch/copy-metadata.ll?rev=244132&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/LoopUnswitch/copy-metadata.ll (added)
+++ llvm/trunk/test/Transforms/LoopUnswitch/copy-metadata.ll Wed Aug  5 16:13:26 2015
@@ -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 = !{}