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<body><span class="vcard"><a class="email" href="mailto:david.majnemer@gmail.com" title="David Majnemer <david.majnemer@gmail.com>"> <span class="fn">David Majnemer</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - gvn incorrectly changing sign of floating point zero"
href="http://llvm.org/bugs/show_bug.cgi?id=22823">bug 22823</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>david.majnemer@gmail.com
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>WORKSFORME
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - gvn incorrectly changing sign of floating point zero"
href="http://llvm.org/bugs/show_bug.cgi?id=22823#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED WORKSFORME - gvn incorrectly changing sign of floating point zero"
href="http://llvm.org/bugs/show_bug.cgi?id=22823">bug 22823</a>
from <span class="vcard"><a class="email" href="mailto:david.majnemer@gmail.com" title="David Majnemer <david.majnemer@gmail.com>"> <span class="fn">David Majnemer</span></a>
</span></b>
<pre>I cannot reproduce with r231493:
Args: ~/llvm/Debug+Asserts/bin/opt -gvn pr22823.ll -S -o - -debug
-print-before=gvn
*** IR Dump Before Global Value Numbering ***
define double @foo(double, double) {
top:
%2 = fcmp une double %0, %1
br i1 %2, label %L3, label %L1
L1: ; preds = %top
%3 = fcmp une double %1, 0.000000e+00
br i1 %3, label %L3, label %L2
L2: ; preds = %L1
ret double %1
L3: ; preds = %L1, %top
%4 = fadd double %1, 1.000000e+00
ret double %4
}
GVN iteration: 0
; ModuleID = 'pr22823.ll'
define double @foo(double, double) {
top:
%2 = fcmp une double %0, %1
br i1 %2, label %L3, label %L1
L1: ; preds = %top
%3 = fcmp une double %1, 0.000000e+00
br i1 %3, label %L3, label %L2
L2: ; preds = %L1
ret double %1
L3: ; preds = %L1, %top
%4 = fadd double %1, 1.000000e+00
ret double %4
}</pre>
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