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llvm-project/llvm/test/Transforms/LoopUnswitch/copy-metadata.ll

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[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
2015-08-06 05:13:26 +08:00
; 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) {
[LoopUnswitch] Fix a test case (h/t to Chandler for pointing this out) The test in question was not at all testing what it was supposed to test. We do not //care// about placing `!make.implicit` in inner constant branch (since it will be folded away anyway). We care about placing `!make.implicit` in the outer branch that switches between either version of the loop. Having said that, it is _correct_ to leave behind the `!make.implicit` in the inner branch, but there is no need to do so. llvm-svn: 299912
2017-04-11 12:11:47 +08:00
; CHECK-LABEL: @test(
; CHECK: br i1 %cond, label %..split_crit_edge, label %.loop_exit.split_crit_edge, !make.implicit !0
[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
2015-08-06 05:13:26 +08:00
br label %loop_begin
loop_begin:
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 = !{}