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Revert "x86_64: Add SSE sfp-exceptions"

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The __sfp_handle_exceptions is not fully correct regarding raising
exceptions, since there is no direct way to raise only FP_EX_OVERFLOW
nor FP_EX_UNDERFLOW for SSE mode.  Both libgcc and feraiseexcept rely
on x87 mode to accomplish it.

This reverts commit 460ee50de0.

Checked on x86_64.
This commit is contained in:
Adhemerval Zanella 2020-04-20 08:14:48 -03:00
parent 019d828669
commit f721171632
2 changed files with 1 additions and 60 deletions
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57
sysdeps/x86/fpu/sfp-exceptions.c
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@ -1,57 +0,0 @@
/* x86_64 soft-fp exception handling for _Float128.
Copyright (C) 2020 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <fenv.h>
#include <float.h>
#include <math-barriers.h>
#include <soft-fp.h>
void
__sfp_handle_exceptions (int _fex)
{
if (_fex & FP_EX_INVALID)
{
float f = 0.0f;
math_force_eval (f / f);
}
if (_fex & FP_EX_DENORM)
{
float f = FLT_MIN, g = 2.0f;
math_force_eval (f / g);
}
if (_fex & FP_EX_DIVZERO)
{
float f = 1.0f, g = 0.0f;
math_force_eval (f / g);
}
if (_fex & FP_EX_OVERFLOW)
{
float force_underflow = FLT_MAX * FLT_MAX;
math_force_eval (force_underflow);
}
if (_fex & FP_EX_UNDERFLOW)
{
float force_overflow = FLT_MIN * FLT_MIN;
math_force_eval (force_overflow);
}
if (_fex & FP_EX_INEXACT)
{
float f = 1.0f, g = 3.0f;
math_force_eval (f / g);
}
}

4
sysdeps/x86_64/fpu/Makefile
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@ -23,10 +23,8 @@ libmvec-support += svml_d_cos2_core svml_d_cos4_core_avx \
svml_s_sincosf8_core svml_s_sincosf16_core
endif
ifeq ($(subdir),math)
libm-routines += sfp-exceptions
# Variables for libmvec tests.
ifeq ($(subdir),math)
ifeq ($(build-mathvec),yes)
libmvec-tests += double-vlen2 double-vlen4 double-vlen4-avx2 \
float-vlen4 float-vlen8 float-vlen8-avx2