Backport of:
commit 487972aea52004f604c2878c8c9d3e77670f2c32
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date: Thu Feb 27 09:43:51 2014 -0600
PowerPC: Optimized isnan/isnanf for POWER8
This patch add a optimized isnan/isnanf implementation for POWER8
using the new Move From VSR Doubleword instruction to gains some
cycles from FP to GRP register move.
ChangeLog:
2014-02-27 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h (INIT_ARCH):
Add hwcap2 initialization.
* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile: Add isnan power8
implementation.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan-power8.S: New file:
POWER8 isnan ifunc implementation.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c (__isnan): Add
POWER8 implementation.
* sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnanf.c (__isnanf):
Likewise.
* sysdeps/powerpc/powerpc64/power8/fpu/s_isnan.S: New file:
POWER8 isnan implementation.
* sysdeps/powerpc/powerpc64/power8/fpu/s_isnanf.S: New file.
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h b/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h
index 51a34f2..72d720d 100644
--- a/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h
+++ b/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h
@@ -36,6 +36,7 @@
and fills the previous ones. */
#define INIT_ARCH() \
unsigned long int hwcap = __GLRO(dl_hwcap); \
+ unsigned long int __attribute__((unused)) hwcap2 = __GLRO(dl_hwcap2); \
if (hwcap & PPC_FEATURE_ARCH_2_06) \
hwcap |= PPC_FEATURE_ARCH_2_05 | \
PPC_FEATURE_POWER5_PLUS | \
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
index 1e04f21..4cd1c5d 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
@@ -4,7 +4,7 @@ sysdep_routines += s_isnan-power7 s_isnan-power6x s_isnan-power6 \
s_copysign-ppc64 s_finite-power7 s_finite-ppc64 \
s_finitef-ppc64 s_isinff-ppc64 s_isinf-power7 \
s_isinf-ppc64 s_modf-power5+ s_modf-ppc64 \
- s_modff-power5+ s_modff-ppc64
+ s_modff-power5+ s_modff-ppc64 s_isnan-power8
libm-sysdep_routines += s_isnan-power7 s_isnan-power6x s_isnan-power6 \
s_isnan-power5 s_isnan-ppc64 s_llround-power6x \
@@ -21,7 +21,8 @@ libm-sysdep_routines += s_isnan-power7 s_isnan-power6x s_isnan-power6 \
s_logbl-power7 s_logb-ppc64 s_logbf-ppc64 \
s_logbl-ppc64 s_modf-power5+ s_modf-ppc64 \
s_modff-power5+ s_modff-ppc64 e_hypot-ppc64 \
- e_hypot-power7 e_hypotf-ppc64 e_hypotf-power7
+ e_hypot-power7 e_hypotf-ppc64 e_hypotf-power7 \
+ s_isnan-power8
CFLAGS-s_logbf-power7.c = -mcpu=power7
CFLAGS-s_logbl-power7.c = -mcpu=power7
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan-power8.S b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan-power8.S
new file mode 100644
index 0000000..c176d5a
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan-power8.S
@@ -0,0 +1,33 @@
+/* isnan(). PowerPC64/POWER7 version.
+ Copyright (C) 2014 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/>. */
+
+#include <sysdep.h>
+#include <math_ldbl_opt.h>
+
+#undef hidden_def
+#define hidden_def(name)
+#undef weak_alias
+#define weak_alias(name, alias)
+#undef strong_alias
+#define strong_alias(name, alias)
+#undef compat_symbol
+#define compat_symbol(lib, name, symbol, ver)
+
+#define __isnan __isnan_power8
+
+#include <sysdeps/powerpc/powerpc64/power8/fpu/s_isnan.S>
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c
index 0de833e..65a5ca0 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnan.c
@@ -26,16 +26,19 @@ extern __typeof (__isnan) __isnan_power5 attribute_hidden;
extern __typeof (__isnan) __isnan_power6 attribute_hidden;
extern __typeof (__isnan) __isnan_power6x attribute_hidden;
extern __typeof (__isnan) __isnan_power7 attribute_hidden;
+extern __typeof (__isnan) __isnan_power8 attribute_hidden;
libc_ifunc (__isnan,
- (hwcap & PPC_FEATURE_ARCH_2_06)
- ? __isnan_power7 :
- (hwcap & PPC_FEATURE_POWER6_EXT)
+ (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+ ? __isnan_power8 :
+ (hwcap & PPC_FEATURE_ARCH_2_06)
+ ? __isnan_power7 :
+ (hwcap & PPC_FEATURE_POWER6_EXT)
? __isnan_power6x :
- (hwcap & PPC_FEATURE_ARCH_2_05)
- ? __isnan_power6 :
- (hwcap & PPC_FEATURE_POWER5)
- ? __isnan_power5
+ (hwcap & PPC_FEATURE_ARCH_2_05)
+ ? __isnan_power6 :
+ (hwcap & PPC_FEATURE_POWER5)
+ ? __isnan_power5
: __isnan_ppc64);
weak_alias (__isnan, isnan)
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnanf.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnanf.c
index b237455..eb68a50 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnanf.c
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/s_isnanf.c
@@ -25,16 +25,19 @@ extern __typeof (__isnanf) __isnan_power5 attribute_hidden;
extern __typeof (__isnanf) __isnan_power6 attribute_hidden;
extern __typeof (__isnanf) __isnan_power6x attribute_hidden;
extern __typeof (__isnanf) __isnan_power7 attribute_hidden;
+extern __typeof (__isnanf) __isnan_power8 attribute_hidden;
libc_ifunc (__isnanf,
- (hwcap & PPC_FEATURE_ARCH_2_06)
- ? __isnan_power7 :
- (hwcap & PPC_FEATURE_POWER6_EXT)
- ? __isnan_power6x :
- (hwcap & PPC_FEATURE_ARCH_2_05)
- ? __isnan_power6 :
- (hwcap & PPC_FEATURE_POWER5)
- ? __isnan_power5
+ (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+ ? __isnan_power8 :
+ (hwcap & PPC_FEATURE_ARCH_2_06)
+ ? __isnan_power7 :
+ (hwcap & PPC_FEATURE_POWER6_EXT)
+ ? __isnan_power6x :
+ (hwcap & PPC_FEATURE_ARCH_2_05)
+ ? __isnan_power6 :
+ (hwcap & PPC_FEATURE_POWER5)
+ ? __isnan_power5
: __isnan_ppc64);
weak_alias (__isnanf, isnanf)
diff --git a/sysdeps/powerpc/powerpc64/power8/fpu/s_isnan.S b/sysdeps/powerpc/powerpc64/power8/fpu/s_isnan.S
new file mode 100644
index 0000000..c1ca9a5
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/power8/fpu/s_isnan.S
@@ -0,0 +1,53 @@
+/* isnan(). PowerPC64/POWER8 version.
+ Copyright (C) 2014 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/>. */
+
+#include <sysdep.h>
+#include <math_ldbl_opt.h>
+
+#define MFVSRD_R3_V1 .byte 0x7c,0x23,0x00,0x66 /* mfvsrd r3,vs1 */
+
+/* int [r3] __isnan([f1] x) */
+
+EALIGN (__isnan, 4, 0)
+ CALL_MCOUNT 0
+ MFVSRD_R3_V1
+ lis r9,0x7ff0
+ clrldi r3,r3,1 /* r3 = r3 & 0x8000000000000000 */
+ rldicr r9,r9,32,31 /* r9 = (r9 << 32) & 0xffffffff */
+ subf r3,r3,r9
+ rldicl r3,r3,1,63
+ blr
+END (__isnan)
+
+/* It turns out that the 'double' version will also always work for
+ single-precision. */
+strong_alias (__isnan, __isnanf)
+hidden_def (__isnanf)
+weak_alias (__isnanf, isnanf)
+
+#ifdef NO_LONG_DOUBLE
+strong_alias (__isnan, __isnanl)
+weak_alias (__isnan, isnanl)
+#endif
+
+#ifndef IS_IN_libm
+# if LONG_DOUBLE_COMPAT(libc, GLIBC_2_0)
+compat_symbol (libc, __isnan, __isnanl, GLIBC_2_0);
+compat_symbol (libc, isnan, isnanl, GLIBC_2_0);
+# endif
+#endif
diff --git a/sysdeps/powerpc/powerpc64/power8/fpu/s_isnanf.S b/sysdeps/powerpc/powerpc64/power8/fpu/s_isnanf.S
new file mode 100644
index 0000000..b48c85e
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/power8/fpu/s_isnanf.S
@@ -0,0 +1 @@
+/* This function uses the same code as s_isnan.S. */