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47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/* High precision, low overhead timing functions. Alpha version.
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Copyright (C) 2001-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson <rth@redhat.com>, 2001.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _HP_TIMING_ALPHA_H
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#define _HP_TIMING_ALPHA_H 1
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#if IS_IN(rtld)
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/* We always have the timestamp register, but it's got only a 4 second
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range. Use it for ld.so profiling only. */
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# define HP_TIMING_INLINE (1)
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/* We use 32 bit values for the times. */
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typedef unsigned int hp_timing_t;
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/* The "rpcc" instruction returns a 32-bit counting half and a 32-bit
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"virtual cycle counter displacement". Subtracting the two gives us
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a virtual cycle count. */
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# define HP_TIMING_NOW(VAR) \
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do { \
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unsigned long int x_; \
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asm volatile ("rpcc %0" : "=r"(x_)); \
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(VAR) = (int) (x_) - (int) (x_ >> 32); \
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} while (0)
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# include <hp-timing-common.h>
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#else
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# include <sysdeps/generic/hp-timing.h>
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#endif /* IS_IN(rtld) */
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#endif /* hp-timing.h */
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