From 50efd9220a0a2be9a980e45a3096c6e5dd5c0ac8 Mon Sep 17 00:00:00 2001 From: Chen Li Date: Wed, 5 Aug 2015 21:13:26 +0000 Subject: [PATCH] [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 --- llvm/lib/Transforms/Scalar/LoopUnswitch.cpp | 1 + llvm/test/Transforms/LoopUnswitch/copy-metadata.ll | 23 ++++++++++++++++++++++ 2 files changed, 24 insertions(+) create mode 100644 llvm/test/Transforms/LoopUnswitch/copy-metadata.ll diff --git a/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp b/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp index 934e161..2b29fda 100644 --- a/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp +++ b/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp @@ -657,6 +657,7 @@ static void copyMetadata(Instruction *DstInst, const Instruction *SrcInst, } } // fallthrough. + case LLVMContext::MD_make_implicit: case LLVMContext::MD_dbg: DstInst->setMetadata(MD.first, MD.second); } diff --git a/llvm/test/Transforms/LoopUnswitch/copy-metadata.ll b/llvm/test/Transforms/LoopUnswitch/copy-metadata.ll new file mode 100644 index 0000000..2a634c25 --- /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 = !{} -- 2.7.4