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<body><span class="vcard"><a class="email" href="mailto:lebedev.ri@gmail.com" title="Roman Lebedev <lebedev.ri@gmail.com>"> <span class="fn">Roman Lebedev</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Instcombine: transform shl(inexact shr(x)) with different constant shifts."
href="https://bugs.llvm.org/show_bug.cgi?id=37872">bug 37872</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Fixed By Commit(s)</td>
<td>
</td>
<td>0ac56e8eaaeb41b59a952fa465872f647c930347
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
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<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Instcombine: transform shl(inexact shr(x)) with different constant shifts."
href="https://bugs.llvm.org/show_bug.cgi?id=37872#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Instcombine: transform shl(inexact shr(x)) with different constant shifts."
href="https://bugs.llvm.org/show_bug.cgi?id=37872">bug 37872</a>
from <span class="vcard"><a class="email" href="mailto:lebedev.ri@gmail.com" title="Roman Lebedev <lebedev.ri@gmail.com>"> <span class="fn">Roman Lebedev</span></a>
</span></b>
<pre>Done in 0ac56e8eaaeb41b59a952fa465872f647c930347.
This doesn't, however, help D46760: we now end up with:
$ ./bin/opt -O3 /tmp/test.ll -o - -S
; ModuleID = '/tmp/test.ll'
source_filename = "/tmp/test.ll"
target datalayout =
"e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; Function Attrs: nounwind
declare i32 @get_number() local_unnamed_addr #0
; Function Attrs: nounwind
define void @narrow_long_chain_with_udiv_urem(i64* nocapture %result)
local_unnamed_addr #0 {
%num1 = tail call i32 @get_number(), !range !0
%num2 = tail call i32 @get_number(), !range !0
%1 = shl nuw nsw i32 %num1, 6
%narrow = add nuw nsw i32 %1, %num2
%2 = and i32 %narrow, 127
%tmp2 = zext i32 %2 to i64
%3 = shl nuw nsw i64 %tmp2, 3
%tmp4 = and i64 %3, 768
%tmp5 = or i64 %tmp4, %tmp2
%tmp6 = or i64 %tmp5, 224
store i64 %tmp6, i64* %result, align 8
ret void
}
attributes #0 = { nounwind }
!0 = !{i32 0, i32 9945}</pre>
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