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[LoopUnswitch] Preserve make.implicit metadata for unswitched conditions

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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
This commit is contained in:
Chen Li 2015-08-05 21:13:26 +00:00
parent a545479844
commit 349a850e5b
2 changed files with 24 additions and 0 deletions
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1
lib/Transforms/Scalar/LoopUnswitch.cpp
View File

@ -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);
}

23
test/Transforms/LoopUnswitch/copy-metadata.ll Normal file
View File

@ -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 = !{}