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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - SimplifyCFG: FoldTwoEntryPHINode does not remove metadata."
href="https://llvm.org/bugs/show_bug.cgi?id=29163">29163</a>
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<th>Summary</th>
<td>SimplifyCFG: FoldTwoEntryPHINode does not remove metadata.
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>3.9
</td>
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<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Transformation Utilities
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>edy.burt@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>In this example, SimplifyCFG::FoldTwoEntryPHINode will make the load
unconditional, without removing the !range annotation (which would then kill a
null check, in the original testcase):
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@GV = external constant i64
define i64 @test(i1 %cond) {
entry:
br i1 %cond, label %if, label %then
then:
%pti = ptrtoint i64* @GV to i64
br label %join
if:
%load = load i64, i64* @GV, align 8, !range !0
br label %join
join:
%phi = phi i64 [ %pti, %then ], [ %load, %if ]
ret i64 %phi
}
!0 = !{i64 1, i64 0}
; -----------------------
; After opt -simplifycfg:
define i64 @test(i1 %cond) {
entry:
%pti = ptrtoint i64* @GV to i64
%load = load i64, i64* @GV, align 8, !range !0
%phi = select i1 %cond, i64 %load, i64 %pti
ret i64 %phi
}</pre>
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</p>
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