math: Remove powerpc e_hypot

The generic implementation is shows only slight worse performance:

POWER10    reciprocal-throughput    latency
master                   8.28478    13.7253
new hypot                7.21945    13.1933

POWER9     reciprocal-throughput    latency
master                   13.4024    14.0967
new hypot                14.8479    15.8061

POWER8     reciprocal-throughput    latency
master                   15.5767    16.8885
new hypot                16.5371    18.4057

One way to improve might to make gcc generate xsmaxdp/xsmindp for
fmax/fmin (it onl does for -ffast-math, clang does for default
options).

Checked on powerpc64-linux-gnu (power8) and powerpc64le-linux-gnu
(power9).

9 files changed, 1 insertions, 327 deletions

diff --git a/sysdeps/powerpc/fpu/e_hypot.c b/sysdeps/powerpc/fpu/e_hypot.c
deleted file mode 100644
index f96c589..0000000
--- a/sysdeps/powerpc/fpu/e_hypot.c
+++ /dev/null
@@ -1,87 +0,0 @@
-/* Pythagorean addition using doubles
-   Copyright (C) 2011-2021 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 Library General Public License as
-   published by the Free Software Foundation; either version 2 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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If
-   not, see <https://www.gnu.org/licenses/>.  */
-
-#include <math.h>
-#include <math_private.h>
-#include <math-underflow.h>
-#include <stdint.h>
-#include <libm-alias-finite.h>
-
-/* __ieee754_hypot(x,y)
- *
- * This a FP only version without any FP->INT conversion.
- * It is similar to default C version, making appropriates
- * overflow and underflows checks as well scaling when it
- * is needed.
- */
-
-double
-__ieee754_hypot (double x, double y)
-{
-  if ((isinf (x) || isinf (y))
-      && !issignaling (x) && !issignaling (y))
-    return INFINITY;
-  if (isnan (x) || isnan (y))
-    return x + y;
-
-  x = fabs (x);
-  y = fabs (y);
-
-  if (y > x)
-    {
-      double t = x;
-      x = y;
-      y = t;
-    }
-  if (y == 0.0)
-    return x;
-
-  /* if y is higher enough, y * 2^60 might overflow. The tests if
-     y >= 1.7976931348623157e+308/2^60 (two60factor) and uses the
-     appropriate check to avoid the overflow exception generation.  */
-  if (y <= 0x1.fffffffffffffp+963 && x > (y * 0x1p+60))
-    return x + y;
-
-  if (x > 0x1p+500)
-    {
-      x *= 0x1p-600;
-      y *= 0x1p-600;
-      return sqrt (x * x + y * y) / 0x1p-600;
-    }
-  if (y < 0x1p-500)
-    {
-      if (y <= 0x0.fffffffffffffp-1022)
-	{
-	  x *= 0x1p+1022;
-	  y *= 0x1p+1022;
-	  double ret = sqrt (x * x + y * y) / 0x1p+1022;
-	  math_check_force_underflow_nonneg (ret);
-	  return ret;
-	}
-      else
-	{
-	  x *= 0x1p+600;
-	  y *= 0x1p+600;
-	  return sqrt (x * x + y * y) / 0x1p+600;
-	}
-    }
-  return sqrt (x * x + y * y);
-}
-#ifndef __ieee754_hypot
-libm_alias_finite (__ieee754_hypot, __hypot)
-#endif
diff --git a/sysdeps/powerpc/fpu/e_hypotf.c b/sysdeps/powerpc/fpu/e_hypotf.c
deleted file mode 100644
index fa201dd..0000000
--- a/sysdeps/powerpc/fpu/e_hypotf.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/* Pythagorean addition using floats
-   Copyright (C) 2011-2021 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 Library General Public License as
-   published by the Free Software Foundation; either version 2 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
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If
-   not, see <https://www.gnu.org/licenses/>.  */
-
-#include <math.h>
-#include <math_private.h>
-#include <stdint.h>
-#include <libm-alias-finite.h>
-
-/* __ieee754_hypotf(x,y)
-
-   This a FP only version without any FP->INT conversion.
-   It is similar to default C version, making appropriates
-   overflow and underflows checks as using double precision
-   instead of scaling.  */
-
-#ifdef _ARCH_PWR7
-/* POWER7 isinf and isnan optimizations are fast. */
-# define TEST_INF_NAN(x, y)                                      \
-   if ((isinff(x) || isinff(y))					 \
-       && !issignaling (x) && !issignaling (y))			 \
-     return INFINITY;                                            \
-   if (isnanf(x) || isnanf(y))                                   \
-     return x + y;
-# else
-/* For POWER6 and below isinf/isnan triggers LHS and PLT calls are
- * costly (especially for POWER6). */
-# define GET_TWO_FLOAT_WORD(f1,f2,i1,i2)                         \
- do {                                                            \
-   ieee_float_shape_type gf_u1;                                  \
-   ieee_float_shape_type gf_u2;                                  \
-   gf_u1.value = (f1);                                           \
-   gf_u2.value = (f2);                                           \
-   (i1) = gf_u1.word & 0x7fffffff;                               \
-   (i2) = gf_u2.word & 0x7fffffff;                               \
- } while (0)
-
-# define TEST_INF_NAN(x, y)                                      \
- do {                                                            \
-   uint32_t hx, hy;                                              \
-   GET_TWO_FLOAT_WORD(x, y, hx, hy);                             \
-   if (hy > hx) {                                                \
-     uint32_t ht = hx; hx = hy; hy = ht;                         \
-   }                                                             \
-   if (hx >= 0x7f800000) {                                       \
-     if ((hx == 0x7f800000 || hy == 0x7f800000)			 \
-	 && !issignaling (x) && !issignaling (y))		 \
-       return INFINITY;                                          \
-     return x + y;						 \
-   }                                                             \
- } while (0)
-#endif
-
-
-float
-__ieee754_hypotf (float x, float y)
-{
-  TEST_INF_NAN (x, y);
-
-  return sqrt ((double) x * x + (double) y * y);
-}
-#ifndef __ieee754_hypotf
-libm_alias_finite (__ieee754_hypotf, __hypotf)
-#endif
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
index 60f2c95..1de0f9b 100644
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/Makefile
@@ -15,8 +15,7 @@ libm-sysdep_routines += s_llrintf-power6 s_llrintf-ppc32 s_llrint-power6 \
 			s_lrint-ppc32 s_modf-power5+ s_modf-ppc32 \
 			s_modff-power5+ s_modff-ppc32 s_logbl-power7 \
 			s_logbl-ppc32 s_logb-power7 s_logb-ppc32 \
-			s_logbf-power7 s_logbf-ppc32 e_hypot-power7 \
-			e_hypot-ppc32 e_hypotf-power7 e_hypotf-ppc32
+			s_logbf-power7 s_logbf-ppc32
 
 CFLAGS-s_llrintf-power6.c += -mcpu=power6
 CFLAGS-s_llrintf-ppc32.c += -mcpu=power4
@@ -35,8 +34,6 @@ CFLAGS-s_modff-power5+.c = -mcpu=power5+
 CFLAGS-s_logbl-power7.c = -mcpu=power7
 CFLAGS-s_logb-power7.c = -mcpu=power7
 CFLAGS-s_logbf-power7.c = -mcpu=power7
-CFLAGS-e_hypot-power7.c = -mcpu=power7
-CFLAGS-e_hypotf-power7.c = -mcpu=power7
 
 # These files quiet sNaNs in a way that is optimized away without
 # -fsignaling-nans.
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-power7.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-power7.c
deleted file mode 100644
index 382b4a0..0000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-power7.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* __ieee_hypot() POWER7 version.
-   Copyright (C) 2013-2021 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 <math.h>
-
-#define __ieee754_hypot __ieee754_hypot_power7
-
-#include <sysdeps/powerpc/fpu/e_hypot.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-ppc32.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-ppc32.c
deleted file mode 100644
index abb14d5..0000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot-ppc32.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* __ieee_hypot() PowerPC32 version.
-   Copyright (C) 2013-2021 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 <math.h>
-
-#define __ieee754_hypot __ieee754_hypot_ppc32
-
-#include <sysdeps/powerpc/fpu/e_hypot.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot.c
deleted file mode 100644
index a16efa3..0000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypot.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/* Multiple versions of ieee754_hypot.
-   Copyright (C) 2013-2021 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 <math.h>
-#include <math_private.h>
-#include <math_ldbl_opt.h>
-#include <libm-alias-finite.h>
-#include "init-arch.h"
-
-extern __typeof (__ieee754_hypot) __ieee754_hypot_ppc32 attribute_hidden;
-extern __typeof (__ieee754_hypot) __ieee754_hypot_power7 attribute_hidden;
-
-libc_ifunc (__ieee754_hypot,
-	    (hwcap & PPC_FEATURE_ARCH_2_06)
-	    ? __ieee754_hypot_power7
-            : __ieee754_hypot_ppc32);
-
-libm_alias_finite (__ieee754_hypot, __hypot)
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-power7.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-power7.c
deleted file mode 100644
index f8a26ff..0000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-power7.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* __ieee754_hypot POWER7 version.
-   Copyright (C) 2013-2021 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 <math.h>
-
-#define __ieee754_hypotf __ieee754_hypotf_power7
-
-#include <sysdeps/powerpc/fpu/e_hypotf.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-ppc32.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-ppc32.c
deleted file mode 100644
index b13f8c9..0000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf-ppc32.c
+++ /dev/null
@@ -1,23 +0,0 @@
-/* __ieee_hypot() PowerPC32 version.
-   Copyright (C) 2013-2021 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 <math.h>
-
-#define __ieee754_hypotf __ieee754_hypotf_ppc32
-
-#include <sysdeps/ieee754/flt-32/e_hypotf.c>
diff --git a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf.c b/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf.c
deleted file mode 100644
index 1e72605..0000000
--- a/sysdeps/powerpc/powerpc32/power4/fpu/multiarch/e_hypotf.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/* Multiple versions of ieee754_hypotf.
-   Copyright (C) 2013-2021 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 <math.h>
-#include <math_private.h>
-#include <math_ldbl_opt.h>
-#include <libm-alias-finite.h>
-#include "init-arch.h"
-
-extern __typeof (__ieee754_hypotf) __ieee754_hypotf_ppc32 attribute_hidden;
-extern __typeof (__ieee754_hypotf) __ieee754_hypotf_power7 attribute_hidden;
-
-libc_ifunc (__ieee754_hypotf,
-	    (hwcap & PPC_FEATURE_ARCH_2_06)
-	    ? __ieee754_hypotf_power7
-            : __ieee754_hypotf_ppc32);
-
-libm_alias_finite (__ieee754_hypotf, __hypotf)