[Bug target/126055] [17 Regression] 10% slowdown of perlbench_r on AMD Zen5 since r17-1927-gb64fc298a3538c

hjl.tools at gmail dot com gcc-bugzilla@gcc.gnu.org
Tue Jun 30 22:46:54 GMT 2026


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126055

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |125856, 125865
                 CC|hjl at gcc dot gnu.org             |hjl.tools at gmail dot com,
                   |                            |liuhongt at gcc dot gnu.org

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Hongtao, can you reproduce it on Intel CPUs?  r17-1927 changes both bounded
memcpy and memset expansions.  Does memcpy or memset change cause this?


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125856
[Bug 125856] [16/17 Regression] x86 gcc16 codesize regression related to memcpy
inline caused by r16-2047-g401199377c5004
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125865
[Bug 125865] [16/17 Regression] Unnecessary branches when expanding memset by
r16-2047-g401199377c5004


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