commit 2dd8e58cc533ee840d37725b11bc0dc0308a5dc0

Author: H.J. Lu <hjl.tools@gmail.com>

Date:   Sun Oct 21 00:37:11 2018 -0700

    x86: Don't include <x86intrin.h>

    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.

diff --git a/sysdeps/x86/hp-timing.h b/sysdeps/x86/hp-timing.h

index 1c20e9d8289cc15b..77a1360748ca4535 100644

--- a/sysdeps/x86/hp-timing.h

+++ b/sysdeps/x86/hp-timing.h

@@ -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