https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77468
--- Comment #1 from PeteVine <tulipawn at gmail dot com> --- GCC 5.3's profile (./c-ray-mt -t 64 -s 1600x1200 -r 8 -i sphfract -o output.ppm): CPU: ARM Cortex-A53, speed 1536 MHz (estimated) Counted CPU_CYCLES events (Cycle) with a unit mask of 0x00 (No unit mask) count 100000 samples % linenr info image name symbol name 4247694 63.5062 c-ray-mt.c:372 c-ray-mt shade 1281882 19.1651 c-ray-mt.c:336 c-ray-mt trace 1022514 15.2874 c-ray-mt.c:310 c-ray-mt render_scanline 49166 0.7351 e_pow.c:65 libm-2.23.so __pow_finite 17372 0.2597 c-ray-mt.c:454 c-ray-mt get_primary_ray 17013 0.2544 e_exp.c:248 libm-2.23.so __exp1 14750 0.2205 c-ray-mt.c:501 c-ray-mt get_sample_pos 13948 0.2085 (no location information) no-vmlinux /no-vmlinux 13325 0.1992 w_pow.c:26 libm-2.23.so pow 4844 0.0724 e_pow.c:455 libm-2.23.so checkint 4426 0.0662 fputc.c:32 libc-2.23.so fputc 932 0.0139 mpa.c:768 libm-2.23.so __sqr 393 0.0059 c-ray-mt.c:170 c-ray-mt main 214 0.0032 mpa.c:615 libm-2.23.so __mul 27 4.0e-04 mpa.c:443 libm-2.23.so sub_magnitudes 19 2.8e-04 mpa.c:375 libm-2.23.so add_magnitudes 11 1.6e-04 mpa.c:333 libm-2.23.so __dbl_mp 8 1.2e-04 mpa.c:114 libm-2.23.so __cpy 7 1.0e-04 mpexp.c:44 libm-2.23.so __mpexp 5 7.5e-05 c-ray-mt.c:656 c-ray-mt thread_func 5 7.5e-05 strtod_l.c:481 libc-2.23.so ____strtod_l_internal 5 7.5e-05 strpbrk.c:30 libc-2.23.so strpbrk 5 7.5e-05 syscall-template.S:86 libc-2.23.so write 5 7.5e-05 mpa.c:310 libm-2.23.so __mp_dbl 5 7.5e-05 mpa.c:563 libm-2.23.so __sub 3 4.5e-05 fileops.c:808 libc-2.23.so _IO_file_overflow@@GLIBC_2.17 3 4.5e-05 cancellation.c:69 libc-2.23.so __libc_disable_asynccancel 3 4.5e-05 fileops.c:501 libc-2.23.so new_do_write 3 4.5e-05 strtod_l.c:338 libc-2.23.so str_to_mpn.isra.0 3 4.5e-05 mpa.c:899 libm-2.23.so __dvd 3 4.5e-05 halfulp.c:64 libm-2.23.so __halfulp 2 3.0e-05 malloc.c:2940 libc-2.23.so free 2 3.0e-05 getpagesize.c:28 libc-2.23.so getpagesize 2 3.0e-05 random.c:288 libc-2.23.so random 2 3.0e-05 random_r.c:357 libc-2.23.so random_r 2 3.0e-05 mpa.c:516 libm-2.23.so __add 2 3.0e-05 mplog.c:41 libm-2.23.so __mplog 1 1.5e-05 dl-runtime.c:66 ld-2.23.so _dl_fixup 1 1.5e-05 rtld.c:647 ld-2.23.so _dl_initial_error_catch_tsd 1 1.5e-05 dl-lookup.c:806 ld-2.23.so _dl_lookup_symbol_x 1 1.5e-05 dl-load.c:871 ld-2.23.so _dl_map_object_from_fd 1 1.5e-05 dl-reloc.c:149 ld-2.23.so _dl_relocate_object 1 1.5e-05 dl-tls.c:321 ld-2.23.so allocate_dtv 1 1.5e-05 dl-lookup.c:92 ld-2.23.so check_match 1 1.5e-05 strcmp.S:52 ld-2.23.so strcmp 1 1.5e-05 fileops.c:494 libc-2.23.so _IO_do_write@@GLIBC_2.17 1 1.5e-05 filedoalloc.c:95 libc-2.23.so _IO_file_doallocate 1 1.5e-05 fileops.c:200 libc-2.23.so _IO_file_finish@@GLIBC_2.17 1 1.5e-05 dl-addr.c:126 libc-2.23.so _dl_addr 1 1.5e-05 malloc.c:3842 libc-2.23.so _int_free 1 1.5e-05 syscall-template.S:84 libc-2.23.so mprotect 1 1.5e-05 strtod_l.c:197 libc-2.23.so round_and_return 1 1.5e-05 strtod.c:64 libc-2.23.so strtod 1 1.5e-05 strtok.c:40 libc-2.23.so strtok 1 1.5e-05 mpa.c:83 libm-2.23.so __acr 1 1.5e-05 k_standard.c:99 libm-2.23.so __kernel_standard 1 1.5e-05 slowpow.c:51 libm-2.23.so __slowpow 1 1.5e-05 allocatestack.c:263 libpthread-2.23.so __free_stacks 1 1.5e-05 pthread_create.c:125 libpthread-2.23.so __nptl_deallocate_tsd 1 1.5e-05 pthread_join.c:45 libpthread-2.23.so pthread_join versus gcc 7's: samples % linenr info image name symbol name 4293002 60.4752 c-ray-mt.c:372 c-ray-mt shade 1465464 20.6439 c-ray-mt.c:336 c-ray-mt trace 1199915 16.9031 c-ray-mt.c:310 c-ray-mt render_scanline 52646 0.7416 e_pow.c:65 libm-2.23.so __pow_finite 17097 0.2408 c-ray-mt.c:454 c-ray-mt get_primary_ray 16953 0.2388 e_exp.c:248 libm-2.23.so __exp1 14991 0.2112 (no location information) no-vmlinux /no-vmlinux 14445 0.2035 w_pow.c:26 libm-2.23.so pow 13474 0.1898 c-ray-mt.c:501 c-ray-mt get_sample_pos 4792 0.0675 e_pow.c:455 libm-2.23.so checkint 4448 0.0627 fputc.c:32 libc-2.23.so fputc 823 0.0116 mpa.c:768 libm-2.23.so __sqr 381 0.0054 c-ray-mt.c:170 c-ray-mt main 201 0.0028 mpa.c:615 libm-2.23.so __mul 22 3.1e-04 mpa.c:443 libm-2.23.so sub_magnitudes 17 2.4e-04 mpa.c:375 libm-2.23.so add_magnitudes 7 9.9e-05 mpa.c:114 libm-2.23.so __cpy 7 9.9e-05 mpa.c:899 libm-2.23.so __dvd 7 9.9e-05 mpexp.c:44 libm-2.23.so __mpexp 6 8.5e-05 mpa.c:83 libm-2.23.so __acr 6 8.5e-05 mpa.c:333 libm-2.23.so __dbl_mp 6 8.5e-05 mpa.c:310 libm-2.23.so __mp_dbl 5 7.0e-05 syscall-template.S:86 libc-2.23.so write 4 5.6e-05 strtod_l.c:481 libc-2.23.so ____strtod_l_internal 4 5.6e-05 strpbrk.c:30 libc-2.23.so strpbrk 4 5.6e-05 halfulp.c:64 libm-2.23.so __halfulp 3 4.2e-05 c-ray-mt.c:656 c-ray-mt thread_func 3 4.2e-05 fileops.c:808 libc-2.23.so _IO_file_overflow@@GLIBC_2.17 3 4.2e-05 mpa.c:516 libm-2.23.so __add 2 2.8e-05 dl-lookup.c:355 ld-2.23.so do_lookup_x 2 2.8e-05 cancellation.c:32 libc-2.23.so __libc_enable_asynccancel 2 2.8e-05 malloc.c:3320 libc-2.23.so _int_malloc 2 2.8e-05 malloc.c:3173 libc-2.23.so calloc 2 2.8e-05 mplog.c:41 libm-2.23.so __mplog 2 2.8e-05 pthread_cond_wait.c:102 libpthread-2.23.so pthread_cond_wait@@GLIBC_2.17 2 2.8e-05 pthread_create.c:254 libpthread-2.23.so start_thread 1 1.4e-05 dl-tls.c:450 ld-2.23.so _dl_allocate_tls_init 1 1.4e-05 dl-lookup.c:806 ld-2.23.so _dl_lookup_symbol_x 1 1.4e-05 dl-load.c:871 ld-2.23.so _dl_map_object_from_fd 1 1.4e-05 dl-misc.c:288 ld-2.23.so _dl_name_match_p 1 1.4e-05 dl-reloc.c:149 ld-2.23.so _dl_relocate_object 1 1.4e-05 access.c:28 ld-2.23.so access 1 1.4e-05 dl-lookup.c:92 ld-2.23.so check_match 1 1.4e-05 strcmp.S:52 ld-2.23.so strcmp 1 1.4e-05 fileops.c:1256 libc-2.23.so _IO_file_write@@GLIBC_2.17 1 1.4e-05 iogetline.c:49 libc-2.23.so _IO_getline_info 1 1.4e-05 cancellation.c:69 libc-2.23.so __libc_disable_asynccancel 1 1.4e-05 thread-freeres.c:28 libc-2.23.so __libc_thread_freeres 1 1.4e-05 mpn2dbl.c:39 libc-2.23.so __mpn_construct_double 1 1.4e-05 dl-addr.c:126 libc-2.23.so _dl_addr 1 1.4e-05 getpagesize.c:28 libc-2.23.so getpagesize 1 1.4e-05 memcpy.S:50 libc-2.23.so memcpy 1 1.4e-05 fileops.c:501 libc-2.23.so new_do_write 1 1.4e-05 random.c:288 libc-2.23.so random 1 1.4e-05 strtod_l.c:197 libc-2.23.so round_and_return 1 1.4e-05 strtod_l.c:338 libc-2.23.so str_to_mpn.isra.0 1 1.4e-05 strerror_l.c:66 libc-2.23.so strerror_thread_freeres 1 1.4e-05 strlen.S:88 libc-2.23.so strlen 1 1.4e-05 vfprintf.c:1236 libc-2.23.so vfprintf 1 1.4e-05 k_standard.c:99 libm-2.23.so __kernel_standard 1 1.4e-05 slowpow.c:51 libm-2.23.so __slowpow 1 1.4e-05 allocatestack.c:762 libpthread-2.23.so __deallocate_stack 1 1.4e-05 cleanup_compat.c:41 libpthread-2.23.so _pthread_cleanup_pop
