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[v2,00/10] Fix some libm static issues

Message ID 20240327194024.1409677-1-adhemerval.zanella@linaro.org
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Series Fix some libm static issues | expand

Message

Adhemerval Zanella Netto March 27, 2024, 7:40 p.m. UTC 
Some recent math optimizations removed some symbols from the static
build and due to the limited static build check, along with
--disable-shared being broken for some time [1]; this issue has slipped
some releases.

Although the fix is straightforward, I added an extra framework to
enable static build for select math libraries using the generic type
framework (which autogenerated the tests for all supported types using
the C template files). I have not enabled it for all tests due to the
required extra size constraint, maybe a future
---enable-static-math-tests configure option could improve test
coverage.

As an experiment, I enabled static build for all autogenerated math
tests. This has uncovered some extra missing symbols on some ABIs, along
with some issues with implementation used on static for some ABIs.  On
x86_64/i686 it shows that the assembly optimizations for acos, log10,
log2, and ldbl-96 y0/y1 show some issues.

I tested this patchset on x86_64, i686, armhf, aarch64, and powerpc64le.
The powerpc64le shows some issues with the static linking, due to the
newly enabled tests (using gcc 13.1):

FAIL: math/test-float128-exp10-static
FAIL: math/test-float64x-exp10-static
FAIL: math/test-ibm128-acos-static
FAIL: math/test-ibm128-copysign-static
FAIL: math/test-ibm128-exp10-static
FAIL: math/test-ibm128-fmod-static
FAIL: math/test-ibm128-frexp-static
FAIL: math/test-ibm128-modf-static

I have not analyzed what is happening, but it might be due to the
'-mabi=ibmlongdouble' along with how libgcc.a was built (I saw some
issues on GCC bugzilla). One option could be XFAIL for now.

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=20845

Adhemerval Zanella (10):
  math: Add support for auto static math tests
  math: Fix i386 and m68k fmod/fmodf on static build (BZ 31488)
  i386: Use generic fmod
  i386: Use generic fmodf
  math: Fix i386 and m68k exp10 on static build
  i386: Use generic exp10
  math: Fix isnanf128 static build
  math: Provided copysignf128 for static libm on alpha, s390, and
    sparcv9
  math: Provide frexpf128 for static libm on alpha, s390, and sparcv9
  math: Provide modf128 for static libm on alpha, s390, and sparcv9

 math/Makefile                               | 111 +++++++++++++++++++-
 math/test-double-static.h                   |   1 +
 math/test-float-static.h                    |   1 +
 math/test-float128-static.h                 |   1 +
 math/test-float32-static.h                  |   1 +
 math/test-float32x-static.h                 |   1 +
 math/test-float64-static.h                  |   1 +
 math/test-float64x-static.h                 |   1 +
 math/test-ibm128-static.h                   |   1 +
 math/test-ldouble-static.h                  |   1 +
 sysdeps/i386/fpu/Versions                   |   5 +
 sysdeps/i386/fpu/e_exp10.S                  |  51 ---------
 sysdeps/i386/fpu/e_exp10.c                  |   2 +
 sysdeps/i386/fpu/e_exp_data.c               |   1 -
 sysdeps/i386/fpu/e_fmod.S                   |  18 ----
 sysdeps/i386/fpu/e_fmod.c                   |   2 +
 sysdeps/i386/fpu/e_fmodf.S                  |  18 ----
 sysdeps/i386/fpu/e_fmodf.c                  |   2 +
 sysdeps/i386/fpu/math_err.c                 |   1 -
 sysdeps/i386/fpu/w_exp10_compat.c           |   3 -
 sysdeps/i386/fpu/w_fmod_compat.c            |  14 ---
 sysdeps/i386/fpu/w_fmodf_compat.c           |  14 ---
 sysdeps/ieee754/dbl-64/e_exp10.c            |   7 +-
 sysdeps/ieee754/dbl-64/e_fmod.c             |   5 +-
 sysdeps/ieee754/float128/float128_private.h |   2 +-
 sysdeps/ieee754/float128/s_isnanf128.c      |   4 +
 sysdeps/ieee754/flt-32/e_fmodf.c            |   5 +-
 sysdeps/ieee754/ldbl-64-128/s_copysignl.c   |   4 +-
 sysdeps/ieee754/ldbl-64-128/s_frexpl.c      |   4 +-
 sysdeps/ieee754/ldbl-64-128/s_modfl.c       |   4 +-
 sysdeps/ieee754/ldbl-opt/s_ldexpl.c         |   4 +-
 sysdeps/m68k/m680x0/fpu/w_exp10_compat.c    |   9 +-
 sysdeps/m68k/m680x0/fpu/w_fmod_compat.c     |   5 +-
 sysdeps/m68k/m680x0/fpu/w_fmodf_compat.c    |   7 +-
 sysdeps/mach/hurd/i386/libm.abilist         |   3 +
 sysdeps/unix/sysv/linux/i386/libm.abilist   |   3 +
 36 files changed, 175 insertions(+), 142 deletions(-)
 create mode 100644 math/test-double-static.h
 create mode 100644 math/test-float-static.h
 create mode 100644 math/test-float128-static.h
 create mode 100644 math/test-float32-static.h
 create mode 100644 math/test-float32x-static.h
 create mode 100644 math/test-float64-static.h
 create mode 100644 math/test-float64x-static.h
 create mode 100644 math/test-ibm128-static.h
 create mode 100644 math/test-ldouble-static.h
 delete mode 100644 sysdeps/i386/fpu/e_exp10.S
 create mode 100644 sysdeps/i386/fpu/e_exp10.c
 delete mode 100644 sysdeps/i386/fpu/e_exp_data.c
 delete mode 100644 sysdeps/i386/fpu/e_fmod.S
 create mode 100644 sysdeps/i386/fpu/e_fmod.c
 delete mode 100644 sysdeps/i386/fpu/e_fmodf.S
 create mode 100644 sysdeps/i386/fpu/e_fmodf.c
 delete mode 100644 sysdeps/i386/fpu/math_err.c
 delete mode 100644 sysdeps/i386/fpu/w_exp10_compat.c
 delete mode 100644 sysdeps/i386/fpu/w_fmod_compat.c
 delete mode 100644 sysdeps/i386/fpu/w_fmodf_compat.c