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42 lines
1.6 KiB
42 lines
1.6 KiB
2 years ago
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commit 2dd8e58cc533ee840d37725b11bc0dc0308a5dc0
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Sun Oct 21 00:37:11 2018 -0700
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x86: Don't include <x86intrin.h>
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Use __builtin_ia32_rdtsc directly since including <x86intrin.h> makes
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building glibc very slow. On Intel Core i5-6260U, this patch reduces
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x86-64 build time from 8 minutes 33 seconds to 3 minutes 48 seconds
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with "make -j4" and GCC 8.2.1.
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* sysdeps/x86/hp-timing.h: Don't include <x86intrin.h>.
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(HP_TIMING_NOW): Replace _rdtsc with __builtin_ia32_rdtsc.
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diff --git a/sysdeps/x86/hp-timing.h b/sysdeps/x86/hp-timing.h
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index 1c20e9d8289cc15b..77a1360748ca4535 100644
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--- a/sysdeps/x86/hp-timing.h
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+++ b/sysdeps/x86/hp-timing.h
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@@ -22,8 +22,6 @@
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#include <isa.h>
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#if MINIMUM_ISA == 686 || MINIMUM_ISA == 8664
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-# include <x86intrin.h>
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-
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/* We always assume having the timestamp register. */
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# define HP_TIMING_AVAIL (1)
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# define HP_SMALL_TIMING_AVAIL (1)
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@@ -38,8 +36,11 @@ typedef unsigned long long int hp_timing_t;
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might not be 100% accurate since there might be some more instructions
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running in this moment. This could be changed by using a barrier like
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'cpuid' right before the `rdtsc' instruciton. But we are not interested
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- in accurate clock cycles here so we don't do this. */
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-# define HP_TIMING_NOW(Var) ((Var) = _rdtsc ())
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+ in accurate clock cycles here so we don't do this.
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+
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+ NB: Use __builtin_ia32_rdtsc directly since including <x86intrin.h>
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+ makes building glibc very slow. */
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+# define HP_TIMING_NOW(Var) ((Var) = __builtin_ia32_rdtsc ())
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# include <hp-timing-common.h>
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#else
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