AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-12-26 04:31:03 +00:00
Code Issues Packages Projects Releases Wiki Activity
3e08ff544b
glibc/sysdeps/i386
History
Szabolcs Nagy 3e08ff544b Add new log2 implementation 
Similar algorithm is used as in log: log2(2^k x) = k + log2(c) + log2(x/c)
where the last term is approximated by a polynomial of x/c - 1, the first
order coefficient is about 1/ln2 in this case.

There is separate code path when fma instruction is not available for
computing x/c - 1 precisely, for which the table size is doubled.

The worst case error is 0.547 ULP (0.55 without fma), the read only
global data size is 1168 bytes (2192 without fma) on aarch64.  The
non-nearest rounding error is less than 1 ULP.

Improvements on Cortex-A72 compared to current glibc master:
log2 thruput: 2.00x in [0.01 11.1]
log2 latency: 2.04x in [0.01 11.1]
log2 thruput: 2.17x in [0.999 1.001]
log2 latency: 2.88x in [0.999 1.001]

Tested on
aarch64-linux-gnu (defined __FP_FAST_FMA)
arm-linux-gnueabihf (!defined __FP_FAST_FMA)
x86_64-linux-gnu (!defined __FP_FAST_FMA)
powerpc64le-linxu-gnu (defined __FP_FAST_FMA)
targets.

	* NEWS: Mention log2 improvements.
	* math/Makefile (type-double-routines): Add e_log2_data.
	* sysdeps/i386/fpu/e_log2_data.c: New file.
	* sysdeps/ia64/fpu/e_log2_data.c: New file.
	* sysdeps/ieee754/dbl-64/e_log2.c: Rewrite.
	* sysdeps/ieee754/dbl-64/e_log2_data.c: New file.
	* sysdeps/ieee754/dbl-64/math_config.h (__log2_data): Add.
	* sysdeps/ieee754/dbl-64/wordsize-64/e_log2.c: Remove.
	* sysdeps/m68k/m680x0/fpu/e_log2_data.c: New file.
2018-09-12 17:36:33 +01:00
..
fpu Add new log2 implementation 2018-09-12 17:36:33 +01:00
htl hurd: Bump remaining LGPL2+ htl licences to LGPL 2.1+ 2018-04-02 16:37:36 +02:00
i586 Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
i686 x86: Don't include <init-arch.h> in assembly codes 2018-08-03 08:05:00 -07:00
i786
nptl x86: Rename __glibc_reserved2 to ssp_base in tcbhead_t 2018-07-25 04:39:39 -07:00
sys Drop fpregset unused symbol exposition 2018-04-20 01:27:13 +02:00
____longjmp_chk.S Add sigstack handling to Linux ____longjmp_chk on i386. 2009-07-30 21:50:14 -07:00
__longjmp.S x86: Support shadow stack pointer in setjmp/longjmp 2018-07-14 05:59:53 -07:00
abort-instr.h
add_n.S i386: Add _CET_ENDBR to indirect jump targets in add_n.S/sub_n.S 2018-07-17 16:11:44 -07:00
addmul_1.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
asm-syntax.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
atomic-machine.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
backtrace.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
bcopy.S Add i386 memset and memcpy assembly functions 2015-08-27 09:04:54 -07:00
bsd-_setjmp.S x86: Support shadow stack pointer in setjmp/longjmp 2018-07-14 05:59:53 -07:00
bsd-setjmp.S x86: Support shadow stack pointer in setjmp/longjmp 2018-07-14 05:59:53 -07:00
bzero.S Add i386 memset and memcpy assembly functions 2015-08-27 09:04:54 -07:00
cacheinfo.c Move sysdeps/x86_64/cacheinfo.c to sysdeps/x86 2016-05-08 08:49:18 -07:00
configure Add --enable-static-pie configure option to build static PIE [BZ #19574] 2017-12-15 17:12:14 -08:00
configure.ac Add --enable-static-pie configure option to build static PIE [BZ #19574] 2017-12-15 17:12:14 -08:00
crti.S x86: Add _CET_ENDBR to functions in crti.S 2018-07-17 16:05:18 -07:00
crtn.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-cet.c x86: Support IBT and SHSTK in Intel CET [BZ #21598] 2018-07-16 14:08:27 -07:00
dl-irel.h [BZ #20271] Add newlines in __libc_fatal calls. 2018-08-31 18:04:32 -07:00
dl-lookupcfg.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-machine.h elf: Unify symbol address run-time calculation [BZ #19818] 2018-04-04 23:09:37 +01:00
dl-procinfo.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-tls.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-tlsdesc.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
dl-tlsdesc.S x86: Add _CET_ENDBR to functions in dl-tlsdesc.S 2018-07-17 16:07:17 -07:00
dl-trampoline.S x86: Support IBT and SHSTK in Intel CET [BZ #21598] 2018-07-16 14:08:27 -07:00
ffs.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
gccframe.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
gmp-mparam.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
htonl.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
htons.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
i386-mcount.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
Implies Add float128 support for x86_64, x86. 2017-06-26 22:02:24 +00:00
init-arch.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
jmpbuf-offsets.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
jmpbuf-unwind.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
ldbl2mpn.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
link-defines.sym Preserve bound registers for pointer pass/return 2015-07-09 06:50:12 -07:00
lshift.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
machine-gmon.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
Makefile math: Set 387 and SSE2 rounding mode for tgamma on i386 [BZ #23253] 2018-06-21 08:04:29 +02:00
malloc-alignment.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcmp.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcopy.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcpy_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memcpy.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memmove_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memmove.S Add i386 memset and memcpy assembly functions 2015-08-27 09:04:54 -07:00
mempcpy_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mempcpy.S Add i386 memset and memcpy assembly functions 2015-08-27 09:04:54 -07:00
memset_chk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memset.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
memusage.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mp_clz_tab.c
mul_1.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
preconfigure Move base_machine and machine settings from configure.ac to sysdeps preconfigure fragments. 2014-06-25 17:52:56 +00:00
pthread_spin_trylock.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
rawmemchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
rshift.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
setfpucw.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
setjmp.S x86: Support shadow stack pointer in setjmp/longjmp 2018-07-14 05:59:53 -07:00
stackguard-macros.h BZ #15754: CVE-2013-4788 2013-09-23 00:52:09 -04:00
stackinfo.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
start.S i386: Use ENTRY and END in start.S [BZ #23606] 2018-09-12 08:41:26 -07:00
stpcpy.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
stpncpy.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcat.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strchrnul.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strcspn.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
string-inlines.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strlen.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strlen.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strpbrk.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strrchr.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
strspn.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sub_n.S i386: Add _CET_ENDBR to indirect jump targets in add_n.S/sub_n.S 2018-07-17 16:11:44 -07:00
submul_1.S Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
symbol-hacks.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
sysdep.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tls-macros.h i386: Fix build by GCC 5.0 2014-12-30 11:37:41 -08:00
tlsdesc.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tlsdesc.sym Introduce TLS descriptors for i386 and x86_64. 2008-05-13 05:41:30 +00:00
tst-audit3.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-audit3.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-audit.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-auditmod3a.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-auditmod3b.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-ld-sse-use.sh Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-stack-align.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
Versions Move __fentry__ version definition to sysdeps/{i386,x86_64} 2018-08-10 09:07:44 +02:00