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-rw-r--r--sysdeps/generic/fix-int-fp-convert-zero.h27
-rw-r--r--sysdeps/ieee754/dbl-64/e_log10.c3
-rw-r--r--sysdeps/ieee754/dbl-64/e_log2.c7
-rw-r--r--sysdeps/ieee754/dbl-64/s_erf.c6
-rw-r--r--sysdeps/ieee754/dbl-64/s_logb.c3
-rw-r--r--sysdeps/ieee754/flt-32/e_log10f.c3
-rw-r--r--sysdeps/ieee754/flt-32/e_log2f.c8
-rw-r--r--sysdeps/ieee754/flt-32/s_erff.c6
-rw-r--r--sysdeps/ieee754/flt-32/s_logbf.c3
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/s_erfl.c6
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/s_logbl.c3
-rw-r--r--sysdeps/powerpc/powerpc32/fpu/configure29
-rw-r--r--sysdeps/powerpc/powerpc32/fpu/configure.ac18
-rw-r--r--sysdeps/powerpc/powerpc32/fpu/fix-int-fp-convert-zero.h28
14 files changed, 145 insertions, 5 deletions
diff --git a/sysdeps/generic/fix-int-fp-convert-zero.h b/sysdeps/generic/fix-int-fp-convert-zero.h
new file mode 100644
index 0000000000..b7fd38e87e
--- /dev/null
+++ b/sysdeps/generic/fix-int-fp-convert-zero.h
@@ -0,0 +1,27 @@
+/* Fix for conversion of integer 0 to floating point.  Generic version.
+   Copyright (C) 2015 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef FIX_INT_FP_CONVERT_ZERO_H
+#define FIX_INT_FP_CONVERT_ZERO_H	1
+
+/* Define this macro to 1 to work around conversions of integer 0 to
+   floating point returning -0 instead of the correct +0 in some
+   rounding modes.  */
+#define FIX_INT_FP_CONVERT_ZERO 0
+
+#endif /* fix-int-fp-convert-zero.h */
diff --git a/sysdeps/ieee754/dbl-64/e_log10.c b/sysdeps/ieee754/dbl-64/e_log10.c
index 8548ee3942..df59d9dce4 100644
--- a/sysdeps/ieee754/dbl-64/e_log10.c
+++ b/sysdeps/ieee754/dbl-64/e_log10.c
@@ -45,6 +45,7 @@
 
 #include <math.h>
 #include <math_private.h>
+#include <fix-int-fp-convert-zero.h>
 
 static const double two54 = 1.80143985094819840000e+16;         /* 0x43500000, 0x00000000 */
 static const double ivln10 = 4.34294481903251816668e-01;        /* 0x3FDBCB7B, 0x1526E50E */
@@ -77,6 +78,8 @@ __ieee754_log10 (double x)
   i = ((u_int32_t) k & 0x80000000) >> 31;
   hx = (hx & 0x000fffff) | ((0x3ff - i) << 20);
   y = (double) (k + i);
+  if (FIX_INT_FP_CONVERT_ZERO && y == 0.0)
+    y = 0.0;
   SET_HIGH_WORD (x, hx);
   z = y * log10_2lo + ivln10 * __ieee754_log (x);
   return z + y * log10_2hi;
diff --git a/sysdeps/ieee754/dbl-64/e_log2.c b/sysdeps/ieee754/dbl-64/e_log2.c
index 997d7cefc8..bc6a34192a 100644
--- a/sysdeps/ieee754/dbl-64/e_log2.c
+++ b/sysdeps/ieee754/dbl-64/e_log2.c
@@ -56,6 +56,7 @@
 
 #include <math.h>
 #include <math_private.h>
+#include <fix-int-fp-convert-zero.h>
 
 static const double ln2 = 0.69314718055994530942;
 static const double two54 = 1.80143985094819840000e+16; /* 43500000 00000000 */
@@ -101,7 +102,11 @@ __ieee754_log2 (double x)
   if ((0x000fffff & (2 + hx)) < 3)
     {                           /* |f| < 2**-20 */
       if (f == zero)
-	return dk;
+	{
+	  if (FIX_INT_FP_CONVERT_ZERO && dk == 0.0)
+	    dk = 0.0;
+	  return dk;
+	}
       R = f * f * (0.5 - 0.33333333333333333 * f);
       return dk - (R - f) / ln2;
     }
diff --git a/sysdeps/ieee754/dbl-64/s_erf.c b/sysdeps/ieee754/dbl-64/s_erf.c
index e59f5f33ce..b4975a8af8 100644
--- a/sysdeps/ieee754/dbl-64/s_erf.c
+++ b/sysdeps/ieee754/dbl-64/s_erf.c
@@ -116,6 +116,7 @@ static char rcsid[] = "$NetBSD: s_erf.c,v 1.8 1995/05/10 20:47:05 jtc Exp $";
 #include <float.h>
 #include <math.h>
 #include <math_private.h>
+#include <fix-int-fp-convert-zero.h>
 
 static const double
   tiny = 1e-300,
@@ -308,7 +309,10 @@ __erfc (double x)
   ix = hx & 0x7fffffff;
   if (ix >= 0x7ff00000)                         /* erfc(nan)=nan */
     {                                           /* erfc(+-inf)=0,2 */
-      return (double) (((u_int32_t) hx >> 31) << 1) + one / x;
+      double ret = (double) (((u_int32_t) hx >> 31) << 1) + one / x;
+      if (FIX_INT_FP_CONVERT_ZERO && ret == 0.0)
+	return 0.0;
+      return ret;
     }
 
   if (ix < 0x3feb0000)                  /* |x|<0.84375 */
diff --git a/sysdeps/ieee754/dbl-64/s_logb.c b/sysdeps/ieee754/dbl-64/s_logb.c
index 7a6c49abf5..3a26b18f78 100644
--- a/sysdeps/ieee754/dbl-64/s_logb.c
+++ b/sysdeps/ieee754/dbl-64/s_logb.c
@@ -18,6 +18,7 @@
 
 #include <math.h>
 #include <math_private.h>
+#include <fix-int-fp-convert-zero.h>
 
 double
 __logb (double x)
@@ -41,6 +42,8 @@ __logb (double x)
 	ma = __builtin_clz (ix);
       rix -= ma - 12;
     }
+  if (FIX_INT_FP_CONVERT_ZERO && rix == 1023)
+    return 0.0;
   return (double) (rix - 1023);
 }
 weak_alias (__logb, logb)
diff --git a/sysdeps/ieee754/flt-32/e_log10f.c b/sysdeps/ieee754/flt-32/e_log10f.c
index 1daeef7107..2cd01b4a50 100644
--- a/sysdeps/ieee754/flt-32/e_log10f.c
+++ b/sysdeps/ieee754/flt-32/e_log10f.c
@@ -15,6 +15,7 @@
 
 #include <math.h>
 #include <math_private.h>
+#include <fix-int-fp-convert-zero.h>
 
 static const float
 two25      =  3.3554432000e+07, /* 0x4c000000 */
@@ -44,6 +45,8 @@ __ieee754_log10f(float x)
 	i  = ((u_int32_t)k&0x80000000)>>31;
 	hx = (hx&0x007fffff)|((0x7f-i)<<23);
 	y  = (float)(k+i);
+	if (FIX_INT_FP_CONVERT_ZERO && y == 0.0f)
+	  y = 0.0f;
 	SET_FLOAT_WORD(x,hx);
 	z  = y*log10_2lo + ivln10*__ieee754_logf(x);
 	return  z+y*log10_2hi;
diff --git a/sysdeps/ieee754/flt-32/e_log2f.c b/sysdeps/ieee754/flt-32/e_log2f.c
index 245be4e6f7..857d13fb9b 100644
--- a/sysdeps/ieee754/flt-32/e_log2f.c
+++ b/sysdeps/ieee754/flt-32/e_log2f.c
@@ -17,6 +17,7 @@
 
 #include <math.h>
 #include <math_private.h>
+#include <fix-int-fp-convert-zero.h>
 
 static const float
 ln2 = 0.69314718055994530942,
@@ -57,7 +58,12 @@ __ieee754_log2f(float x)
 	dk = (float)k;
 	f = x-(float)1.0;
 	if((0x007fffff&(15+ix))<16) {	/* |f| < 2**-20 */
-	    if(f==zero) return dk;
+	    if(f==zero)
+	      {
+		if (FIX_INT_FP_CONVERT_ZERO && dk == 0.0f)
+		  dk = 0.0f;
+		return dk;
+	      }
 	    R = f*f*((float)0.5-(float)0.33333333333333333*f);
 	    return dk-(R-f)/ln2;
 	}
diff --git a/sysdeps/ieee754/flt-32/s_erff.c b/sysdeps/ieee754/flt-32/s_erff.c
index 3162d81d08..c8b6287503 100644
--- a/sysdeps/ieee754/flt-32/s_erff.c
+++ b/sysdeps/ieee754/flt-32/s_erff.c
@@ -21,6 +21,7 @@ static char rcsid[] = "$NetBSD: s_erff.c,v 1.4 1995/05/10 20:47:07 jtc Exp $";
 #include <float.h>
 #include <math.h>
 #include <math_private.h>
+#include <fix-int-fp-convert-zero.h>
 
 static const float
 tiny	    = 1e-30,
@@ -161,7 +162,10 @@ float __erfcf(float x)
 	ix = hx&0x7fffffff;
 	if(ix>=0x7f800000) {			/* erfc(nan)=nan */
 						/* erfc(+-inf)=0,2 */
-	    return (float)(((u_int32_t)hx>>31)<<1)+one/x;
+	    float ret = (float)(((u_int32_t)hx>>31)<<1)+one/x;
+	    if (FIX_INT_FP_CONVERT_ZERO && ret == 0.0f)
+	      return 0.0f;
+	    return ret;
 	}
 
 	if(ix < 0x3f580000) {		/* |x|<0.84375 */
diff --git a/sysdeps/ieee754/flt-32/s_logbf.c b/sysdeps/ieee754/flt-32/s_logbf.c
index ba0267ebcb..9ae20e332a 100644
--- a/sysdeps/ieee754/flt-32/s_logbf.c
+++ b/sysdeps/ieee754/flt-32/s_logbf.c
@@ -15,6 +15,7 @@
 
 #include <math.h>
 #include <math_private.h>
+#include <fix-int-fp-convert-zero.h>
 
 float
 __logbf (float x)
@@ -33,6 +34,8 @@ __logbf (float x)
          though it were normalized.  */
       rix -= __builtin_clz (ix) - 9;
     }
+  if (FIX_INT_FP_CONVERT_ZERO && rix == 127)
+    return 0.0f;
   return (float) (rix - 127);
 }
 weak_alias (__logbf, logbf)
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_erfl.c b/sysdeps/ieee754/ldbl-128ibm/s_erfl.c
index 455c645561..82d889d14e 100644
--- a/sysdeps/ieee754/ldbl-128ibm/s_erfl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/s_erfl.c
@@ -106,6 +106,7 @@
 #include <math.h>
 #include <math_private.h>
 #include <math_ldbl_opt.h>
+#include <fix-int-fp-convert-zero.h>
 
 /* Evaluate P[n] x^n  +  P[n-1] x^(n-1)  +  ...  +  P[0] */
 
@@ -839,7 +840,10 @@ __erfcl (long double x)
   if (ix >= 0x7ff00000)
     {				/* erfc(nan)=nan */
       /* erfc(+-inf)=0,2 */
-      return (long double) ((hx >> 31) << 1) + one / x;
+      long double ret = (long double) ((hx >> 31) << 1) + one / x;
+      if (FIX_INT_FP_CONVERT_ZERO && ret == 0.0L)
+	return 0.0L;
+      return ret;
     }
 
   if (ix < 0x3fd00000) /* |x| <1/4 */
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_logbl.c b/sysdeps/ieee754/ldbl-128ibm/s_logbl.c
index 22e5fc24c0..3c07c5e8e2 100644
--- a/sysdeps/ieee754/ldbl-128ibm/s_logbl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/s_logbl.c
@@ -22,6 +22,7 @@
 #include <math.h>
 #include <math_private.h>
 #include <math_ldbl_opt.h>
+#include <fix-int-fp-convert-zero.h>
 
 long double
 __logbl (long double x)
@@ -53,6 +54,8 @@ __logbl (long double x)
       if ((hxs ^ lx) < 0 && (lx & 0x7fffffffffffffffLL) != 0)
 	rhx--;
     }
+  if (FIX_INT_FP_CONVERT_ZERO && rhx == 1023)
+    return 0.0L;
   return (long double) (rhx - 1023);
 }
 #ifndef __logbl
diff --git a/sysdeps/powerpc/powerpc32/fpu/configure b/sysdeps/powerpc/powerpc32/fpu/configure
new file mode 100644
index 0000000000..69a151b2c0
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/fpu/configure
@@ -0,0 +1,29 @@
+# This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
+ # Local configure fragment for sysdeps/powerpc/powerpc32/fpu.
+
+# Test whether integer to floating point conversions use fcfid.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for fcfid use" >&5
+$as_echo_n "checking for fcfid use... " >&6; }
+if ${libc_cv_ppc_fcfid+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  echo 'double foo (int x) { return (double) x; }' > conftest.c
+libc_cv_ppc_fcfid=no
+if { ac_try='${CC-cc} -S $CFLAGS conftest.c -o conftest.s 1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then
+  if grep '[ 	]fcfid' conftest.s > /dev/null 2>&1; then
+    libc_cv_ppc_fcfid=yes
+  fi
+fi
+rm -rf conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ppc_fcfid" >&5
+$as_echo "$libc_cv_ppc_fcfid" >&6; }
+if test $libc_cv_ppc_fcfid = yes; then
+  $as_echo "#define HAVE_PPC_FCFID 1" >>confdefs.h
+
+fi
diff --git a/sysdeps/powerpc/powerpc32/fpu/configure.ac b/sysdeps/powerpc/powerpc32/fpu/configure.ac
new file mode 100644
index 0000000000..e596e793ae
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/fpu/configure.ac
@@ -0,0 +1,18 @@
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/powerpc/powerpc32/fpu.
+
+# Test whether integer to floating point conversions use fcfid.
+AC_CACHE_CHECK([for fcfid use], [libc_cv_ppc_fcfid], [dnl
+echo 'double foo (int x) { return (double) x; }' > conftest.c
+libc_cv_ppc_fcfid=no
+if AC_TRY_COMMAND(${CC-cc} -S $CFLAGS conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
+changequote(,)dnl
+  if grep '[ 	]fcfid' conftest.s > /dev/null 2>&1; then
+    libc_cv_ppc_fcfid=yes
+  fi
+changequote([,])dnl
+fi
+rm -rf conftest*])
+if test $libc_cv_ppc_fcfid = yes; then
+  AC_DEFINE([HAVE_PPC_FCFID])
+fi
diff --git a/sysdeps/powerpc/powerpc32/fpu/fix-int-fp-convert-zero.h b/sysdeps/powerpc/powerpc32/fpu/fix-int-fp-convert-zero.h
new file mode 100644
index 0000000000..9ab8faddb6
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/fpu/fix-int-fp-convert-zero.h
@@ -0,0 +1,28 @@
+/* Fix for conversion of integer 0 to floating point.  PowerPC version.
+   Copyright (C) 2015 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
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef FIX_INT_FP_CONVERT_ZERO_H
+#define FIX_INT_FP_CONVERT_ZERO_H	1
+
+/* The code sequences GCC generates for conversion of integers to
+   floating point result in -0 instead of +0 in FE_DOWNWARD mode when
+   the fcfid instruction is not used, as of GCC 5.  See
+   <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67771>.  */
+#define FIX_INT_FP_CONVERT_ZERO (!HAVE_PPC_FCFID)
+
+#endif /* fix-int-fp-convert-zero.h */
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-05 00:46:25 +0000