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[Bug middle-end/81818] aarch64 uses 2-3x memory and 2x time of arm at -Os, -O2, -O3
- From: "andrewm.roberts at sky dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 17 Aug 2017 10:44:42 +0000
- Subject: [Bug middle-end/81818] aarch64 uses 2-3x memory and 2x time of arm at -Os, -O2, -O3
- Auto-submitted: auto-generated
- References: <bug-81818-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81818
--- Comment #11 from Andrew Roberts <andrewm.roberts at sky dot com> ---
Created attachment 41992
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41992&action=edit
gcc-7.2.0 -fmem-report output for arm, aarch64, and x86-64
Output for gcc 7.2.0 with -fmem-report (as gcc-7.2.0-fmem-report.tar.bz2).
g++ -Ox -fmem-report -c testmap.cpp
where -Ox is one of: -O0, -O1, -O2, -O3, or -O1 -fgcse
This is across: x64 (x86-64) , arm, aarch64-rpi3 (aarch64)
Both Raspberry Pi 3 systems are identical, one has 32 bit OS, other has 64 bit
OS (Arch Linux ARM)
The files are named: gcc-7.2.0-[arch]-[opt].txt.