https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53659
PeteVine <tulipawn at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tulipawn at gmail dot com
--- Comment #2 from PeteVine <tulipawn at gmail dot com> ---
Even though I've tested this on a Cortex-A5, the 18% difference does reproduce
on gcc 6.1.1 (2694 vs 3304 ms):
First, the slower profile for A9 codegen:
CPU: ARM Cortex-A5, speed 1.728e+06 MHz (estimated)
Counted CPU_CYCLES events (CPU cycle) with a unit mask of 0x00 (No unit mask)
count 900000
samples % linenr info image name symbol
name
14460 65.7422 c-ray-mt.c:377 c-ray-mt shade
3901 17.7358 c-ray-mt.c:336 c-ray-mt trace
3181 14.4624 c-ray-mt.c:308 c-ray-mt
render_scanline
186 0.8456 e_pow.c:70 libm-2.19.so
__pow_finite
68 0.3092 e_exp.c:240 libm-2.19.so __exp1
55 0.2501 (no location information) no-vmlinux
/no-vmlinux
40 0.1819 c-ray-mt.c:454 c-ray-mt
get_primary_ray
38 0.1728 c-ray-mt.c:497 c-ray-mt
get_sample_pos
17 0.0773 fraiseexcpt.c:27 libm-2.19.so
feraiseexcept
13 0.0591 e_pow.c:430 libm-2.19.so checkint
6 0.0273 fesetround.c:31 libm-2.19.so
fesetround
5 0.0227 fputc.c:37 libc-2.19.so fputc
5 0.0227 feupdateenv.c:27 libm-2.19.so
feupdateenv@@GLIBC_2.4
4 0.0182 feholdexcpt.c:32 libm-2.19.so
feholdexcept
4 0.0182 fesetenv.c:31 libm-2.19.so
fesetenv@@GLIBC_2.4
3 0.0136 mpa.c:767 libm-2.19.so __sqr
2 0.0091 strtod_l.c:483 libc-2.19.so
____strtod_l_internal
1 0.0045 c-ray-mt.c:170 c-ray-mt main
1 0.0045 dl-tls.c:770 ld-2.19.so
__tls_get_addr
1 0.0045 dl-reloc.c:154 ld-2.19.so
_dl_relocate_object
1 0.0045 (no location information) libc-2.19.so
.udivsi3_skip_div0_test
1 0.0045 malloc.c:3302 libc-2.19.so
_int_malloc
1 0.0045 random_r.c:366 libc-2.19.so random_r
1 0.0045 strtod_l.c:201 libc-2.19.so
round_and_return
compared to the default codegen:
samples % linenr info image name symbol
name
11657 64.6211 c-ray-mt.c:377 c-ray-mt shade
3396 18.8259 c-ray-mt.c:336 c-ray-mt trace
2586 14.3356 c-ray-mt.c:308 c-ray-mt
render_scanline
172 0.9535 e_pow.c:70 libm-2.19.so
__pow_finite
49 0.2716 (no location information) no-vmlinux
/no-vmlinux
47 0.2605 e_exp.c:240 libm-2.19.so __exp1
41 0.2273 c-ray-mt.c:454 c-ray-mt
get_primary_ray
39 0.2162 c-ray-mt.c:497 c-ray-mt
get_sample_pos
16 0.0887 e_pow.c:430 libm-2.19.so checkint
12 0.0665 fraiseexcpt.c:27 libm-2.19.so
feraiseexcept
7 0.0388 fputc.c:37 libc-2.19.so fputc
2 0.0111 c-ray-mt.c:170 c-ray-mt main
2 0.0111 strtod_l.c:483 libc-2.19.so
____strtod_l_internal
2 0.0111 mpa.c:767 libm-2.19.so __sqr
2 0.0111 feholdexcpt.c:32 libm-2.19.so
feholdexcept
2 0.0111 fesetround.c:31 libm-2.19.so
fesetround
1 0.0055 cxa_thread_atexit_impl.c:83 libc-2.19.so
__call_tls_dtors
1 0.0055 memchr.S:58 libc-2.19.so memchr
1 0.0055 random_r.c:366 libc-2.19.so random_r
1 0.0055 strtok.c:38 libc-2.19.so strtok
1 0.0055 mpa.c:614 libm-2.19.so __mul
1 0.0055 fesetenv.c:31 libm-2.19.so
fesetenv@@GLIBC_2.4
1 0.0055 feupdateenv.c:27 libm-2.19.so
feupdateenv@@GLIBC_2.4
