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x86: Don't include <x86intrin.h>

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Use __builtin_ia32_rdtsc directly since including <x86intrin.h> makes
building glibc very slow.  On Intel Core i5-6260U, this patch reduces
x86-64 build time from 8 minutes 33 seconds to 3 minutes 48 seconds
with "make -j4" and GCC 8.2.1.

	* sysdeps/x86/hp-timing.h: Don't include <x86intrin.h>.
	(HP_TIMING_NOW): Replace _rdtsc with __builtin_ia32_rdtsc.
This commit is contained in:
H.J. Lu 2018-10-21 00:37:11 -07:00
parent d0a7415979
commit 2dd8e58cc5
2 changed files with 10 additions and 4 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2018-10-21 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86/hp-timing.h: Don't include <x86intrin.h>.
(HP_TIMING_NOW): Replace _rdtsc with __builtin_ia32_rdtsc.
2018-10-19 Joseph Myers <joseph@codesourcery.com>
[BZ #23794]

9
sysdeps/x86/hp-timing.h
View File

@ -22,8 +22,6 @@
#include <isa.h>
#if MINIMUM_ISA == 686 || MINIMUM_ISA == 8664
# include <x86intrin.h>
/* We always assume having the timestamp register. */
# define HP_TIMING_AVAIL (1)
# define HP_SMALL_TIMING_AVAIL (1)
@ -38,8 +36,11 @@ typedef unsigned long long int hp_timing_t;
might not be 100% accurate since there might be some more instructions
running in this moment. This could be changed by using a barrier like
'cpuid' right before the `rdtsc' instruciton. But we are not interested
in accurate clock cycles here so we don't do this. */
# define HP_TIMING_NOW(Var) ((Var) = _rdtsc ())
in accurate clock cycles here so we don't do this.
NB: Use __builtin_ia32_rdtsc directly since including <x86intrin.h>
makes building glibc very slow. */
# define HP_TIMING_NOW(Var) ((Var) = __builtin_ia32_rdtsc ())
# include <hp-timing-common.h>
#else