From dcef4a7cd5d513eaa65a00ccd1d1ef93c2e9a43f Mon Sep 17 00:00:00 2001
From: Hans Wennborg <hans@hanshq.net>
Date: Tue, 16 Jan 2018 15:00:51 +0000
Subject: Merging r321789:
 ------------------------------------------------------------------------
 r321789 | hiraditya | 2018-01-03 23:47:24 -0800 (Wed, 03 Jan 2018) | 8 lines

[GVNHoist] Fix: PR35222 gvn-hoist incorrectly erases load in case of a loop

Reviewers:
    dberlin
    sebpop
    eli.friedman

Differential Revision: https://reviews.llvm.org/D41453
------------------------------------------------------------------------


git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_60@322558 91177308-0d34-0410-b5e6-96231b3b80d8
---
 test/Transforms/GVNHoist/pr35222-hoist-load.ll | 45 ++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'test/Transforms')

diff --git a/test/Transforms/GVNHoist/pr35222-hoist-load.ll b/test/Transforms/GVNHoist/pr35222-hoist-load.ll
index 7e9c6200616..b9b1a870a59 100644
--- a/test/Transforms/GVNHoist/pr35222-hoist-load.ll
+++ b/test/Transforms/GVNHoist/pr35222-hoist-load.ll
@@ -1,4 +1,5 @@
 ; RUN: opt -S -gvn-hoist < %s | FileCheck %s
+; CHECK-LABEL: build_tree
 ; CHECK: load
 ; CHECK: load
 ; Check that the load is not hoisted because the call can potentially
@@ -23,3 +24,47 @@ do.end:                                           ; preds = %do.body
 }
 
 declare i1 @pqdownheap(i32)
+
+@i = external hidden unnamed_addr global i32, align 4
+@j = external hidden unnamed_addr global [573 x i32], align 4
+@v = external global i1
+
+; CHECK-LABEL: test
+; CHECK-LABEL: do.end
+; CHECK: load
+; Check that the load is not hoisted because the call can potentially
+; modify the global
+
+define i32 @test() {
+entry:
+  br label %for.cond
+
+for.cond:
+  %a3 = load volatile i1, i1* @v
+  br i1 %a3, label %for.body, label %while.end
+
+for.body:
+  br label %if.then
+
+if.then:
+  %tmp4 = load i32, i32* @i, align 4
+  br label %for.cond
+
+while.end:
+  br label %do.body
+
+do.body:
+  %tmp9 = load i32, i32* getelementptr inbounds ([573 x i32], [573 x i32]* @j,
+i32 0, i32 1), align 4
+  %tmp10 = load i32, i32* @i, align 4
+  call void @fn()
+  %a1 = load volatile i1, i1* @v
+  br i1 %a1, label %do.body, label %do.end
+
+do.end:
+  %tmp20 = load i32, i32* getelementptr inbounds ([573 x i32], [573 x i32]* @j,
+i32 0, i32 1), align 4
+  ret i32 %tmp20
+}
+
+declare void @fn()
-- 
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