linux/lib/dhry_2.c

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lib: add Dhrystone benchmark test When working on SoC bring-up, (a full) userspace may not be available, making it hard to benchmark the CPU performance of the system under development. Still, one may want to have a rough idea of the (relative) performance of one or more CPU cores, especially when working on e.g. the clock driver that controls the CPU core clock(s). Hence make the classical Dhrystone 2.1 benchmark available as a Linux kernel test module, based on[1]. When built-in, this benchmark can be run without any userspace present. Parallel runs (run on multiple CPU cores) are supported, just kick the "run" file multiple times. Note that the actual figures depend on the configuration options that control compiler optimization (e.g. CONFIG_CC_OPTIMIZE_FOR_SIZE vs. CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE), and on the compiler options used when building the kernel in general. Hence numbers may differ from those obtained by running similar benchmarks in userspace. [1] https://github.com/qris/dhrystone-deb.git Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lkml.kernel.org/r/4d07ad990740a5f1e426ce4566fb514f60ec9bdd.1670509558.git.geert+renesas@glider.be Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Brendan Higgins <brendanhiggins@google.com> Cc: David Gow <davidgow@google.com> [geert+renesas@glider.be: fix uninitialized use of ret] Link: https://lkml.kernel.org/r/alpine.DEB.2.22.394.2212190857310.137329@ramsan.of.borg Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-12-08 14:31:28 +00:00
// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/*
****************************************************************************
*
* "DHRYSTONE" Benchmark Program
* -----------------------------
*
* Version: C, Version 2.1
*
* File: dhry_2.c (part 3 of 3)
*
* Date: May 25, 1988
*
* Author: Reinhold P. Weicker
*
****************************************************************************
*/
#include "dhry.h"
#include <linux/string.h>
static Boolean Func_3(Enumeration Enum_Par_Val)
/***************************/
/* executed once */
/* Enum_Par_Val == Ident_3 */
{
Enumeration Enum_Loc;
Enum_Loc = Enum_Par_Val;
if (Enum_Loc == Ident_3) {
/* then, executed */
return true;
} else {
/* not executed */
return false;
}
} /* Func_3 */
void Proc_6(Enumeration Enum_Val_Par, Enumeration *Enum_Ref_Par)
/*********************************/
/* executed once */
/* Enum_Val_Par == Ident_3, Enum_Ref_Par becomes Ident_2 */
{
*Enum_Ref_Par = Enum_Val_Par;
if (!Func_3(Enum_Val_Par)) {
/* then, not executed */
*Enum_Ref_Par = Ident_4;
}
switch (Enum_Val_Par) {
case Ident_1:
*Enum_Ref_Par = Ident_1;
break;
case Ident_2:
if (Int_Glob > 100) {
/* then */
*Enum_Ref_Par = Ident_1;
} else {
*Enum_Ref_Par = Ident_4;
}
break;
case Ident_3: /* executed */
*Enum_Ref_Par = Ident_2;
break;
case Ident_4:
break;
case Ident_5:
*Enum_Ref_Par = Ident_3;
break;
} /* switch */
} /* Proc_6 */
void Proc_7(One_Fifty Int_1_Par_Val, One_Fifty Int_2_Par_Val, One_Fifty *Int_Par_Ref)
/**********************************************/
/* executed three times */
/* first call: Int_1_Par_Val == 2, Int_2_Par_Val == 3, */
/* Int_Par_Ref becomes 7 */
/* second call: Int_1_Par_Val == 10, Int_2_Par_Val == 5, */
/* Int_Par_Ref becomes 17 */
/* third call: Int_1_Par_Val == 6, Int_2_Par_Val == 10, */
/* Int_Par_Ref becomes 18 */
{
One_Fifty Int_Loc;
Int_Loc = Int_1_Par_Val + 2;
*Int_Par_Ref = Int_2_Par_Val + Int_Loc;
} /* Proc_7 */
void Proc_8(Arr_1_Dim Arr_1_Par_Ref, Arr_2_Dim Arr_2_Par_Ref, int Int_1_Par_Val, int Int_2_Par_Val)
/*********************************************************************/
/* executed once */
/* Int_Par_Val_1 == 3 */
/* Int_Par_Val_2 == 7 */
{
One_Fifty Int_Index;
One_Fifty Int_Loc;
Int_Loc = Int_1_Par_Val + 5;
Arr_1_Par_Ref[Int_Loc] = Int_2_Par_Val;
Arr_1_Par_Ref[Int_Loc+1] = Arr_1_Par_Ref[Int_Loc];
Arr_1_Par_Ref[Int_Loc+30] = Int_Loc;
for (Int_Index = Int_Loc; Int_Index <= Int_Loc+1; ++Int_Index)
Arr_2_Par_Ref[Int_Loc][Int_Index] = Int_Loc;
Arr_2_Par_Ref[Int_Loc][Int_Loc-1] += 1;
Arr_2_Par_Ref[Int_Loc+20][Int_Loc] = Arr_1_Par_Ref[Int_Loc];
Int_Glob = 5;
} /* Proc_8 */
Enumeration Func_1(Capital_Letter Ch_1_Par_Val, Capital_Letter Ch_2_Par_Val)
/*************************************************/
/* executed three times */
/* first call: Ch_1_Par_Val == 'H', Ch_2_Par_Val == 'R' */
/* second call: Ch_1_Par_Val == 'A', Ch_2_Par_Val == 'C' */
/* third call: Ch_1_Par_Val == 'B', Ch_2_Par_Val == 'C' */
{
Capital_Letter Ch_1_Loc;
Capital_Letter Ch_2_Loc;
Ch_1_Loc = Ch_1_Par_Val;
Ch_2_Loc = Ch_1_Loc;
if (Ch_2_Loc != Ch_2_Par_Val) {
/* then, executed */
return Ident_1;
} else {
/* not executed */
Ch_1_Glob = Ch_1_Loc;
return Ident_2;
}
} /* Func_1 */
Boolean Func_2(Str_30 Str_1_Par_Ref, Str_30 Str_2_Par_Ref)
/*************************************************/
/* executed once */
/* Str_1_Par_Ref == "DHRYSTONE PROGRAM, 1'ST STRING" */
/* Str_2_Par_Ref == "DHRYSTONE PROGRAM, 2'ND STRING" */
{
One_Thirty Int_Loc;
Capital_Letter Ch_Loc;
Int_Loc = 2;
while (Int_Loc <= 2) {
/* loop body executed once */
if (Func_1(Str_1_Par_Ref[Int_Loc],
Str_2_Par_Ref[Int_Loc+1]) == Ident_1) {
/* then, executed */
Ch_Loc = 'A';
Int_Loc += 1;
}
} /* if, while */
if (Ch_Loc >= 'W' && Ch_Loc < 'Z') {
/* then, not executed */
Int_Loc = 7;
}
if (Ch_Loc == 'R') {
/* then, not executed */
return true;
} else {
/* executed */
if (strcmp(Str_1_Par_Ref, Str_2_Par_Ref) > 0) {
/* then, not executed */
Int_Loc += 7;
Int_Glob = Int_Loc;
return true;
} else {
/* executed */
return false;
}
} /* if Ch_Loc */
} /* Func_2 */