Changes between Initial Version and Version 1 of LibCSSE/strlen

Timestamp:

Aug 8, 2014, 4:09:52 PM (12 years ago)

Author:

john

Comment:

--

LibCSSE/strlen

@@ +1 @@
+= strlen =
+
+== Variants ==
+
+||= '''Name''' =||= '''Description''' =||
+|| stock || MI C version ||
+|| SSE2 || {{{pcmpeqb}}} and {{{pmovmskb}}} ||
+|| SSE4.2 || {{{pcmpestri}}} and {{{pcpmestrm}}} ||
+|| AVX || 128-bit {{{vpcmpeqb}}} and {{{vpmovmskb}}} ||
+|| ERMS || {{{repne scasb}}} for machines with ERMS ||
+
+'''Note:''' clang was too smart and optimized plain {{{strlen}}} calls away, so I had to create a copy of the C version called {{{strlen_mi()}}} to fool it.
+
+== Machines Tested ==
+
+||= '''CPU''' =||= '''Speed (GHz)''' =||= '''Notes''' ||
+|| Xeon X5365 || 3.00 || 2 x 4 Supermicro X7DBU ||
+|| Xeon X5482 || 3.20 || 2 x 4 Supermicro X7DWN+ ||
+|| Xeon X5675 || 3.07 || Westmere 2 x 6 Supermicro X8DTU ||
+|| Core i5-2520M || 2.50 || Sandy Bridge 1 x 4 Thinkpad X220 (4286) ||
+|| Xeon E5-2680 || 2.70 || Romley 2 x 8 Supermicro X9DRW ||
+|| Xeon E5-2667 v2 || 3.30 || Romley V2 2 x 8 Supermicro X9DRW ||
+
+== Test Cases ==
+
+||= '''Name''' =||= '''Description''' =||
+|| page || aligned string one page - 1 long ||
+|| short || aligned string 14 characters long ||
+|| short2 || aligned string 32 characters long ||
+|| short3 || aligned string 48 characters long ||
+|| offset || 4 byte offset string 126 characters long ||
+|| offset2 || 7 byte offset string 95 characters long ||
+
+== Results ==
+
+The numbers are the min value in the distribution where the values are a TSC delta across a single invocation of the test.
+
+{{{#!th rowspan=3
+'''CPU'''
+}}}
+{{{#!th colspan=30
+'''Test / Variant'''
+}}}
+|--
+{{{#!th colspan=5
+'''page'''
+}}}
+{{{#!th colspan=5
+'''short'''
+}}}
+{{{#!th colspan=5
+'''short2'''
+}}}
+{{{#!th colspan=5
+'''short3'''
+}}}
+{{{#!th colspan=5
+'''offset'''
+}}}
+{{{#!th colspan=5
+'''offset2'''
+}}}
+|--
+|| '''stock''' || '''SSE2''' || '''SSSE4.2''' || '''AVX''' || '''ERMS''' || \
+|| '''stock''' || '''SSE2''' || '''SSSE4.2''' || '''AVX''' || '''ERMS''' || \
+|| '''stock''' || '''SSE2''' || '''SSSE4.2''' || '''AVX''' || '''ERMS''' || \
+|| '''stock''' || '''SSE2''' || '''SSSE4.2''' || '''AVX''' || '''ERMS''' || \
+|| '''stock''' || '''SSE2''' || '''SSSE4.2''' || '''AVX''' || '''ERMS''' || \
+|| '''stock''' || '''SSE2''' || '''SSSE4.2''' || '''AVX''' || '''ERMS''' ||
+