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From: "matt at use dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/53676] New: [4.7/4.8 regression] constant folding regression, shown as slowdown as measured by Adobe's C++Benchmark
Date: Thu, 14 Jun 2012 22:47:00 -0000 [thread overview]
Message-ID: <bug-53676-4@http.gcc.gnu.org/bugzilla/> (raw)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53676
Bug #: 53676
Summary: [4.7/4.8 regression] constant folding regression,
shown as slowdown as measured by Adobe's C++Benchmark
Classification: Unclassified
Product: gcc
Version: 4.7.1
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: middle-end
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: matt@use.net
The attached ZIP contains two binaries and preprocessor output files, based on
a subset of a test in Adobe's C++Benchmark suite. All GCC versions I tested
prior to 4.7 do the folding correctly. I tried using Ofast and other tricks to
workaround this new regression to no avail.
-rw-r--r-- 1 mhargett users 143573 Jun 14 15:31 int8_folding_test.gcc47.i
mhargett@chert:~/src/C++Benchmarks-gcc47-google-fast$ ./int8_folding_test-gcc46
./int8_folding_test-gcc46
test description absolute operations ratio with
number time per second test0
0 "int8_t constant" 0.00 sec inf M -nan
Total absolute time for int8_t simple constant folding: 0.00 sec
mhargett@chert:~/src/C++Benchmarks-gcc47-google-fast$ ./int8_folding_test-gcc47
./int8_folding_test-gcc47
test description absolute operations ratio with
number time per second test0
0 "int8_t constant" 0.69 sec 2318.84 M 1.00
Total absolute time for int8_t simple constant folding: 0.69 sec
next reply other threads:[~2012-06-14 22:47 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-14 22:47 matt at use dot net [this message]
2012-06-14 22:49 ` [Bug middle-end/53676] " matt at use dot net
2012-06-14 23:00 ` matt at use dot net
2012-06-14 23:13 ` [Bug middle-end/53676] [4.7/4.8 regression] empty loop is not always removed now pinskia at gcc dot gnu.org
2012-06-15 0:02 ` hjl.tools at gmail dot com
2012-06-19 13:18 ` rguenth at gcc dot gnu.org
2012-06-25 8:19 ` rguenth at gcc dot gnu.org
2012-06-25 13:41 ` rguenth at gcc dot gnu.org
2012-06-27 11:33 ` [Bug middle-end/53676] [4.7 " rguenth at gcc dot gnu.org
2012-06-27 11:33 ` [Bug middle-end/53676] [4.7/4.8 " rguenth at gcc dot gnu.org
2012-06-27 11:33 ` [Bug middle-end/53676] [4.7 " rguenth at gcc dot gnu.org
2012-06-27 18:27 ` matt at use dot net
2012-06-28 8:26 ` rguenther at suse dot de
2012-08-21 21:40 ` matt at use dot net
2012-08-22 8:48 ` rguenth at gcc dot gnu.org
2012-08-22 8:56 ` steven at gcc dot gnu.org
2012-08-22 9:18 ` rguenth at gcc dot gnu.org
2012-08-23 18:01 ` matt at use dot net
2012-09-06 15:21 ` rguenth at gcc dot gnu.org
2012-09-20 10:16 ` jakub at gcc dot gnu.org
2013-04-10 8:11 ` rguenth at gcc dot gnu.org
2013-04-11 7:59 ` rguenth at gcc dot gnu.org
2014-05-06 11:58 ` rguenth at gcc dot gnu.org
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