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| author | H.J. Lu <hjl.tools@gmail.com> | 2018-10-24 02:19:15 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2018-10-24 02:19:34 -0700 |
| commit | 7cc65773f04e0f4252428c40dcbb784a39b58cd1 (patch) | |
| tree | 8ab811df64ea1c81daac9b4e8b645ea3998acf08 /ChangeLog | |
| parent | 18ad0de6513bf8a8e4ba757c069e6806d07920f8 (diff) | |
| download | glibc-7cc65773f04e0f4252428c40dcbb784a39b58cd1.tar.gz glibc-7cc65773f04e0f4252428c40dcbb784a39b58cd1.tar.xz glibc-7cc65773f04e0f4252428c40dcbb784a39b58cd1.zip | |
x86: Support RDTSCP for benchtests
RDTSCP waits until all previous instructions have executed and all previous loads are globally visible before reading the counter. RDTSC doesn't wait until all previous instructions have been executed before reading the counter. All x86 processors since 2010 support RDTSCP instruction. This patch adds RDTSCP support to benchtests. * benchtests/Makefile (CPPFLAGS-nonlib): Add -DUSE_RDTSCP if USE_RDTSCP is defined. * sysdeps/x86/hp-timing.h (HP_TIMING_NOW): Use RDTSCP if USE_RDTSCP is defined.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 6cb7d604ce..cda75db202 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,10 @@ +2018-10-24 H.J. Lu <hongjiu.lu@intel.com> + + * benchtests/Makefile (CPPFLAGS-nonlib): Add -DUSE_RDTSCP if + USE_RDTSCP is defined. + * sysdeps/x86/hp-timing.h (HP_TIMING_NOW): Use RDTSCP if + USE_RDTSCP is defined. + 2018-10-23 Adhemerval Zanella <adhemerval.zanella@linaro.org> * misc/tst-preadvwritev2-common.c (IOV_MAX): Define if not |