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[Bug math/18875] Excess precision leads incorrect libm
- From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 26 Aug 2015 13:34:49 +0000
- Subject: [Bug math/18875] Excess precision leads incorrect libm
- Auto-submitted: auto-generated
- References: <bug-18875-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=18875
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The branch, hjl/i486/multiarch has been created
at f7eea8a23ba1eac64fb4df4adac0994eb1100bbb (commit)
- Log -----------------------------------------------------------------
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f7eea8a23ba1eac64fb4df4adac0994eb1100bbb
commit f7eea8a23ba1eac64fb4df4adac0994eb1100bbb
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Aug 26 04:20:42 2015 -0700
Add i386 math multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6382df1128284235df4b74eca24b74a55cb0b067
commit 6382df1128284235df4b74eca24b74a55cb0b067
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Aug 25 07:45:24 2015 -0700
Add i386 wmemcmp multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=37e0039145eab31a6f40bd4f405d70980a10997e
commit 37e0039145eab31a6f40bd4f405d70980a10997e
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Aug 25 06:51:45 2015 -0700
Add i386 wcslen multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0c214795731114419952cdee950126f511d78256
commit 0c214795731114419952cdee950126f511d78256
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Aug 25 06:24:16 2015 -0700
Add i386 wcscpy multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=8b5e495be44cd9784204b3b17b059424b55c192d
commit 8b5e495be44cd9784204b3b17b059424b55c192d
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Aug 25 06:12:47 2015 -0700
Add i386 wcscmp multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4dc3f36ad92e8483f64a2ee832ee689c2359b925
commit 4dc3f36ad92e8483f64a2ee832ee689c2359b925
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Aug 25 06:06:30 2015 -0700
Add i386 wcschr/wcsrchr multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c30b6b2c95b116f7088f7d254c8bb1c3c2f0b357
commit c30b6b2c95b116f7088f7d254c8bb1c3c2f0b357
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Aug 24 16:03:28 2015 -0700
Add i386 strspn multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bab8c4eff77fe6d1f15a6cb36bf66a950ffcbed8
commit bab8c4eff77fe6d1f15a6cb36bf66a950ffcbed8
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Aug 24 13:01:12 2015 -0700
Add i386 strlen family multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7242ead89619cef1105c879cfe08c9cd61794d79
commit 7242ead89619cef1105c879cfe08c9cd61794d79
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Aug 24 11:41:57 2015 -0700
Add i386 strrchr multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=79d496f795977272c898b3361e4f924eda944380
commit 79d496f795977272c898b3361e4f924eda944380
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Aug 24 10:46:29 2015 -0700
Add i386 strcspn family multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dac0c89a3d69a11ccdc5ccf0212f6ed687ba5071
commit dac0c89a3d69a11ccdc5ccf0212f6ed687ba5071
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Sun Aug 23 12:47:24 2015 -0700
Add i386 strchr multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=755b04a7a8927ff6a7e67a4e05f764da2741f2ee
commit 755b04a7a8927ff6a7e67a4e05f764da2741f2ee
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 15:20:58 2015 -0700
Add i386 strcat multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e97d33ad32153aec16fdeae573ff003d76522a8f
commit e97d33ad32153aec16fdeae573ff003d76522a8f
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 13:57:22 2015 -0700
Add i386 strcmp family multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=91c716e2d9ccf9423a5061a9cf71a4572159bb6e
commit 91c716e2d9ccf9423a5061a9cf71a4572159bb6e
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 12:05:50 2015 -0700
Add i386 strcpy family multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7861c599d99f5cff9cceb0fbc9123a94090b0555
commit 7861c599d99f5cff9cceb0fbc9123a94090b0555
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 08:56:52 2015 -0700
Add i386 s_fma family multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=02ff40bab5a671b590bdf21c9219b863f2d52f4b
commit 02ff40bab5a671b590bdf21c9219b863f2d52f4b
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 08:39:14 2015 -0700
Add i386 sched_cpucount multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=fec5d43d6ed8734d23ee353ecbc8e0ebb708398d
commit fec5d43d6ed8734d23ee353ecbc8e0ebb708398d
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 08:33:40 2015 -0700
Add i386 rawmemchr multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4fe752c906aaf1d1d8e956f4a0d3eb89dcc92c99
commit 4fe752c906aaf1d1d8e956f4a0d3eb89dcc92c99
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 08:28:10 2015 -0700
Add i386 memrchr multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=db05d09576d5df9c99915fe606c23ff3ed48764a
commit db05d09576d5df9c99915fe606c23ff3ed48764a
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 08:20:41 2015 -0700
Add i386 memcmp multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=509b30facb29ec41a303afcfefbe767214c50209
commit 509b30facb29ec41a303afcfefbe767214c50209
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 08:05:39 2015 -0700
Add i386 memchr multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=d1d165f3d9b3c516d36d346c55004ada0b325ff4
commit d1d165f3d9b3c516d36d346c55004ada0b325ff4
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 06:28:49 2015 -0700
Add i386 memcpy family multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=eac66bd967d2799596af357f7e4210c56ad8e9a4
commit eac66bd967d2799596af357f7e4210c56ad8e9a4
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Aug 19 14:10:40 2015 -0700
Add i386 memset family multiarch functions
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b6a42295f437e7c3ab942d915d616bc1d8367b5d
commit b6a42295f437e7c3ab942d915d616bc1d8367b5d
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Tue Aug 18 13:45:25 2015 -0700
Add i386 memset and memcpy assembly functions
Add i386 memset and memcpy assembly functions with REP MOVSB/STOSB
instructions.
* sysdeps/i386/bcopy.S: New file.
* sysdeps/i386/bzero.S: Likewise.
* sysdeps/i386/memcpy.S: Likewise.
* sysdeps/i386/memmove.S: Likewise.
* sysdeps/i386/mempcpy.S: Likewise.
* sysdeps/i386/memset.S: Likewise.
* sysdeps/i386/bzero.c: Removed.
* sysdeps/i386/memset.c: Likewise.
* sysdeps/i386/i586/memcpy_chk.S: Likewise.
* sysdeps/i386/i586/mempcpy_chk.S: Likewise.
* sysdeps/i386/i586/memset_chk.S: Likewise.
* sysdeps/i386/i686/memcpy_chk.S: Moved to ...
* sysdeps/i386/memcpy_chk.S: Here.
* sysdeps/i386/i686/memmove_chk.S: Moved to ...
* sysdeps/i386/memmove_chk.S: Here.
* sysdeps/i386/i686/mempcpy_chk.S: Moved to ...
* sysdeps/i386/mempcpy_chk.S: Likewise.
* sysdeps/i386/i686/memset_chk.S: Moved to ...
* sysdeps/i386/memset_chk.S: Likewise.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=b6486a4bc96371871e74ac92bc0c83ef6a70f3f1
commit b6486a4bc96371871e74ac92bc0c83ef6a70f3f1
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon Aug 17 10:19:05 2015 -0700
Detect i586 and i686 features at run-time
We detect i586 and i686 features at run-time by checking CX8 and CMOV
CPUID features bits. We can use these information to select the best
implementation in ix86 multiarch. Due to the reordering and the other
nifty extensions in i686, it is not really good to use heavily i586
optimized code on an i686. It's better to use i486/i386 code if it
isn't an i586.
* sysdeps/i386/init-arch.h: New file.
* sysdeps/i386/i486/init-arch.h: Likewise.
* sysdeps/i386/i586/init-arch.h: Likewise.
* sysdeps/i386/i686/init-arch.h: Likewise.
* sysdeps/x86/cpu-features.c (init_cpu_features): Set bit_I586
bit if CX8 is available. Set bit_I686 bit if CMOV is available.
* sysdeps/x86/cpu-features.h (bit_I586): New.
(bit_I686): Likewise.
(bit_CX8): Likewise.
(bit_CMOV): Likewise.
(index_CX8): Likewise.
(index_CMOV): Likewise.
(index_I586): Likewise.
(index_I686): Likewise.
(reg_CX8): Likewise.
(reg_CMOV): Likewise.
(HAS_I586): Defined as HAS_ARCH_FEATURE (I586) if i586 isn't
available at compile-time.
(HAS_I686): Defined as HAS_ARCH_FEATURE (I686) if i686 isn't
available at compile-time.
* sysdeps/x86/init-arch.h (USE_I586): New macro.
(USE_I686): Likewise.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=81100cea4a76c82babbeda9c414ef3f47f48b967
commit 81100cea4a76c82babbeda9c414ef3f47f48b967
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Thu Aug 20 09:50:33 2015 -0700
Replace MEMPCPY_P/PIC with USE_AS_MEMPCPY/SHARED
Replace MEMPCPY_P with USE_AS_MEMPCPY in i586 memcpy.S to support i386
multi-arch memcpy. Also we should check SHARED not PIC for libc.so
since libc.a may be compiled with PIC.
* sysdeps/i386/i586/memcpy.S (MEMPCPY_P): Removed.
Check USE_AS_MEMPCPY/SHARED instead of MEMPCPY_P/PIC.
* sysdeps/i386/i586/mempcpy.S (USE_AS_MEMPCPY): New.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a57dad3d7c1fc9c1b795c83dedc3809918c4bddc
commit a57dad3d7c1fc9c1b795c83dedc3809918c4bddc
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Aug 19 13:43:30 2015 -0700
Replace BZERO_P/PIC with USE_AS_BZERO/SHARED
Replace BZERO_P with USE_AS_BZERO in i586/i686 memset.S to support i386
multi-arch memset. Also we should check SHARED not PIC for libc.so
since libc.a may be compiled with PIC.
* sysdeps/i386/i586/bzero.S (USE_AS_BZERO): New.
* sysdeps/i386/i686/bzero.S (USE_AS_BZERO): Likewise.
* sysdeps/i386/i586/memset.S (BZERO_P): Removed.
Check USE_AS_BZERO/SHARED instead of BZERO_P/PIC.
(__memset_zero_constant_len_parameter): New.
* sysdeps/i386/i686/memset.S (BZERO_P): Removed.
Check USE_AS_BZERO/SHARED instead of BZERO_P/PIC.
(__memset_zero_constant_len_parameter): Don't define if
__memset_chk or USE_AS_BZERO are defined.
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=346823cdad1a889ce642d58e0ab3e11fcea0e824
commit 346823cdad1a889ce642d58e0ab3e11fcea0e824
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Wed Aug 26 06:27:32 2015 -0700
Avoid excess precision in check against float zero
For check against float zero:
float z;
z = ...
if (z == 0)
on x86 with excess precision, we may get
(gdb) info float
=>R7: Valid 0x3d30e0d9b4d78a806800 +6.369668676344082156e-217
R6: Empty 0x40029000000000000000
and z (+6.369668676344082156e-217) == 0 is false. We can avoid excess
precision by checking binary representations of float zero directly.
[BZ #18875]
* sysdeps/i386/fpu/w_exp10f.c: New file.
* sysdeps/i386/fpu/w_exp2f.c: Likwise.
* sysdeps/i386/fpu/w_expf.c: Likwise.
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