1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; Copyright(c) 2021-2024, Intel Corporation All rights reserved.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions
; are met:
; * Redistributions of source code must retain the above copyright
; notice, this list of conditions and the following disclaimer.
; * Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions and the following disclaimer in
; the documentation and/or other materials provided with the
; distribution.
; * Neither the name of Intel Corporation nor the names of its
; contributors may be used to endorse or promote products derived
; from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
%ifdef LINUX
;;; macro to declare global symbols
;;; - name : symbol name
;;; - type : function or data
;;; - scope : internal, private, default
%define MKGLOBAL(name,type,scope) global name %+ : %+ type scope
%else
;;; macro to declare global symbols
;;; - name : symbol name
;;; - type : function or data
;;; - scope : internal, private, default (ignored in win64 coff format)
%define MKGLOBAL(name,type,scope) global name
%endif
%ifdef WIN_ABI
%define arg1 rcx
%define arg2 rdx
%else
%define arg1 rdi
%define arg2 rsi
%endif
%define GP0 r8
%define GP1 r9
%define GP2 r10
;; macro to read TSC into GP register
%macro RDTSCP 1
%define %%TSC %1 ; GP reg to store TSC value (cannot be rax, rdx or rcx)
rdtscp
shl rdx, 32
or rax, rdx
mov %%TSC, rax
%endmacro
section .text
;; uint64_t measure_tsc(const uint64_t cycles);
MKGLOBAL(measure_tsc,function,)
align 16
measure_tsc:
;; store arg1 (clobbered in RDTSCP on Windows)
mov GP0, arg1
;; get start ts
RDTSCP GP1
;; loop with fixed_overhead number of cycles due to
;; 1-cycle latency dependency on all non-ancient CPUs
mov rax, GP0 ; arg1 (cycles)
fixed_loop:
dec eax
dec eax
jg fixed_loop
;; get end ts
RDTSCP rax
sub rax, GP1
ret
%ifdef LINUX
section .note.GNU-stack noalloc noexec nowrite progbits
%endif
|
