1 /* High precision, low overhead timing functions. Alpha version. 2 Copyright (C) 2001-2022 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library. If not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _HP_TIMING_ALPHA_H 20 #define _HP_TIMING_ALPHA_H 1 21 22 #if IS_IN(rtld) 23 /* We always have the timestamp register, but it's got only a 4 second 24 range. Use it for ld.so profiling only. */ 25 # define HP_TIMING_INLINE (1) 26 27 /* We use 32 bit values for the times. */ 28 typedef unsigned int hp_timing_t; 29 30 /* The "rpcc" instruction returns a 32-bit counting half and a 32-bit 31 "virtual cycle counter displacement". Subtracting the two gives us 32 a virtual cycle count. */ 33 # define HP_TIMING_NOW(VAR) \ 34 do { \ 35 unsigned long int x_; \ 36 asm volatile ("rpcc %0" : "=r"(x_)); \ 37 (VAR) = (int) (x_) - (int) (x_ >> 32); \ 38 } while (0) 39 # include <hp-timing-common.h> 40 41 #else 42 # include <sysdeps/generic/hp-timing.h> 43 #endif /* IS_IN(rtld) */ 44 45 #endif /* hp-timing.h */ 46