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* optimization/8474: -mcup=i686 produces much faster code than -mcpu=pentium4 on a P4 machine
@ 2002-11-05 23:36 davejf
  0 siblings, 0 replies; only message in thread
From: davejf @ 2002-11-05 23:36 UTC (permalink / raw)
  To: gcc-gnats


>Number:         8474
>Category:       optimization
>Synopsis:       -mcup=i686 produces much faster code than -mcpu=pentium4 on a P4 machine
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Tue Nov 05 23:36:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     davejf@starband.net
>Release:        unknown-1.0
>Organization:
>Environment:
gcc -v
Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2/specs
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --host=i386-redhat-linux --with-system-zlib --enable-__cxa_atexit
Thread model: posix
gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)

P4 2.2 Ghz, 512 MB RAM
>Description:
Although I've noticed that -mcpu=pentium4 produces more efficient code (than -mcpu=i686 on a P4 CPU) for all of the other benchmarks I've tried, the whetstone benchmark w/ math lib. calls removed runs ~40% faster on a P4 CPU with the -mcpu=i686 flag vs. the -mcpu=pentium4 flag. I wanted to pass this along on the chance that maybe analyzing the difference might lead to better optimizations for the P4 core in future versions of GCC.

The attached tarball contains the source code and the two executables.

i686 executable compiled with:
g++ -mcpu=i686 -O3 -ffast-math -fmove-all-movables -fomit-frame-pointer -funroll-loops -o whetstone_i686 whetstone.cpp

P4 executable compile with:
g++ -mcpu=pentium4 -O3 -ffast-math -fmove-all-movables -fomit-frame-pointer -funroll-loops
-o whetstone_pentium4 whetstone.cpp

Results - i686:
whetstone took: 0.83 secs for 1208 MFLOPS (w/  math lib)
whetstone took: 0.16 secs for 6400 MFLOPS (w/o math lib)

Results - P4:
whetstone took: 0.89 secs for 1123 MFLOPS (w/  math lib)
whetstone took: 0.22 secs for 4613 MFLOPS (w/o math lib)
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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2002-11-05 23:36 optimization/8474: -mcup=i686 produces much faster code than -mcpu=pentium4 on a P4 machine davejf

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