[glibc] Revert "x86_64: Add SSE sfp-exceptions"

[glibc] Revert "x86_64: Add SSE sfp-exceptions"

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f721171632d67f397e712db52b9ce36bb46fdd96

commit f721171632d67f397e712db52b9ce36bb46fdd96
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Mon Apr 20 08:14:48 2020 -0300

    Revert "x86_64: Add SSE sfp-exceptions"
    
    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 460ee50de054396cc9791ff4cfdc2f5029fb923d.
    
    Checked on x86_64.

Diff:
---
 sysdeps/x86/fpu/sfp-exceptions.c | 57 ----------------------------------------
 sysdeps/x86_64/fpu/Makefile      |  4 +--
 2 files changed, 1 insertion(+), 60 deletions(-)

diff --git a/sysdeps/x86/fpu/sfp-exceptions.c b/sysdeps/x86/fpu/sfp-exceptions.c
deleted file mode 100644
index 74ce0716e2..0000000000
--- a/sysdeps/x86/fpu/sfp-exceptions.c
+++ /dev/null
@@ -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);
-    }
-}
diff --git a/sysdeps/x86_64/fpu/Makefile b/sysdeps/x86_64/fpu/Makefile
index a95e3f74f4..a4ff2723a8 100644
--- a/sysdeps/x86_64/fpu/Makefile
+++ b/sysdeps/x86_64/fpu/Makefile
@@ -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