| 2018-09-26 14:43:25 |
Paul Stephen Borile |
description |
Looks like code using strstr() and libc-2.27 is running 4 times slower than was with libc-2.23. Having a look at profiled code executed in various moments show different versions of strstr :
- libc-2.27.so: strstr.c, str-two-way.h - this is current version ubuntu 18.04.1
Same code, profiled March 13, 2018 :
- libc-2.23.so: strstr-sse2-unaligned.S
Is the removal of sse2 optimized code from strstr() an error of some kind ?
Best
-Paul |
Looks like code using strstr() and libc-2.27 is running 4 times slower than was with libc-2.23. Having a look at profiled code executed in various moments show different versions of strstr :
- libc-2.27.so: strstr.c, str-two-way.h - this is current version ubuntu 18.04.1
Same code, profiled March 13, 2018 :
- libc-2.23.so: strstr-sse2-unaligned.S
Looks like the indirect function part of glibc is not working correctly : any test I can do to spot the problem ?
Best
-Paul |
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