On Feb 21 14:28, Brian Inglis wrote: > Added in Linux 5.6: > Check FSRM and use REP MOVSB for short copies on systems that have it. > > >From the Intel Optimization Reference Manual: > > 3.7.6.1 Fast Short REP MOVSB > Beginning with processors based on Ice Lake Client microarchitecture, > REP MOVSB performance is enhanced with string lengths up to 128 bytes. > Support for fast-short REP MOVSB is indicated by the CPUID feature flag: > CPUID [EAX=7H, ECX=0H).EDX.FAST_SHORT_REP_MOVSB[bit 4] = 1. > There is no change in the REP STOS performance. > --- > winsup/cygwin/fhandler_proc.cc | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/winsup/cygwin/fhandler_proc.cc b/winsup/cygwin/fhandler_proc.cc > index 78a69703d..030ade68a 100644 > --- a/winsup/cygwin/fhandler_proc.cc > +++ b/winsup/cygwin/fhandler_proc.cc > @@ -1346,6 +1346,7 @@ format_proc_cpuinfo (void *, char *&destbuf) > > ftcprint (features1, 2, "avx512_4vnniw"); /* vec dot prod dw */ > ftcprint (features1, 3, "avx512_4fmaps"); /* vec 4 FMA > single */ > + ftcprint (features1, 4, "fsrm"); /* fast short REP > MOVSB */ > ftcprint (features1, 8, "avx512_vp2intersect"); /* vec intcpt d/q > */ > ftcprint (features1, 10, "md_clear"); /* verw clear buf > */ > ftcprint (features1, 18, "pconfig"); /* platform > config */ > -- > 2.21.0
Pushed. Thanks, Corinna -- Corinna Vinschen Cygwin Maintainer
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