lby/lk
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[benchmarks] Use volatile variables in bench_sincos

Browse Source 
In addition to fixing -Wdouble-promition issues in bench_sincos, this also
ensures that the compiler can't replace the calls to sin/cos/sqrt with a
compile-time constant.
This commit is contained in:
Alex Richardson
2023-03-10 14:23:46 +00:00
committed by Travis Geiselbrecht
parent 99bf8f9c41
commit 00f7060ba9
1 changed files with 8 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
app/tests/benchmarks.c
View File

@@ -201,34 +201,36 @@ __NO_INLINE static void arm_bench_multi_issue(void) {
__NO_INLINE static void bench_sincos(void) {
printf("touching the floating point unit\n");
__UNUSED volatile double _hole = sin(0);
volatile float input_f = 1234567.0f;
volatile double input_d = 1234567.0;
ulong count = arch_cycle_count();
__UNUSED double a = sin(2.0);
__UNUSED volatile double d = sin(input_d);
count = arch_cycle_count() - count;
printf("took %lu cycles for sin()\n", count);
count = arch_cycle_count();
a = cos(2.0);
d = cos(input_d);
count = arch_cycle_count() - count;
printf("took %lu cycles for cos()\n", count);
count = arch_cycle_count();
a = sinf(2.0);
__UNUSED volatile float f = sinf(input_f);
count = arch_cycle_count() - count;
printf("took %lu cycles for sinf()\n", count);
count = arch_cycle_count();
a = cosf(2.0);
f = cosf(input_f);
count = arch_cycle_count() - count;
printf("took %lu cycles for cosf()\n", count);
count = arch_cycle_count();
a = sqrt(1234567.0);
d = sqrt(input_d);
count = arch_cycle_count() - count;
printf("took %lu cycles for sqrt()\n", count);
count = arch_cycle_count();
a = sqrtf(1234567.0f);
f = sqrtf(input_f);
count = arch_cycle_count() - count;
printf("took %lu cycles for sqrtf()\n", count);
}