Add optimized nearbyint{,f} for x86-64

6 files changed, 105 insertions, 1 deletions

diff --git a/sysdeps/x86_64/fpu/bits/mathinline.h b/sysdeps/x86_64/fpu/bits/mathinline.h
index 6221958..57d718d 100644
--- a/sysdeps/x86_64/fpu/bits/mathinline.h
+++ b/sysdeps/x86_64/fpu/bits/mathinline.h
@@ -167,6 +167,24 @@ __NTH (rintf (float __x))
   return __res;
 }
 
+#ifdef __USE_ISOC99
+/* Round to nearest integer without raising inexact exception.  */
+__MATH_INLINE double
+__NTH (nearbyint (double __x))
+{
+  double __res;
+  __asm ("roundsd $0xc, %1, %0" : "=x" (__res) : "xm" (__x));
+  return __res;
+}
+__MATH_INLINE float
+__NTH (nearbyintf (float __x))
+{
+  float __res;
+  __asm ("roundss $0xc, %1, %0" : "=x" (__res) : "xm" (__x));
+  return __res;
+}
+#endif
+
 __END_NAMESPACE_C99
 #  endif
 
diff --git a/sysdeps/x86_64/fpu/multiarch/Makefile b/sysdeps/x86_64/fpu/multiarch/Makefile
index b29feed..bd07e98 100644
--- a/sysdeps/x86_64/fpu/multiarch/Makefile
+++ b/sysdeps/x86_64/fpu/multiarch/Makefile
@@ -1,4 +1,4 @@
 ifeq ($(subdir),math)
 libm-sysdep_routines += s_floor-c s_ceil-c s_floorf-c s_ceilf-c \
-			s_rint-c s_rintf-c
+			s_rint-c s_rintf-c s_nearbyint-c s_nearbyintf-c
 endif
diff --git a/sysdeps/x86_64/fpu/multiarch/s_nearbyint-c.c b/sysdeps/x86_64/fpu/multiarch/s_nearbyint-c.c
new file mode 100644
index 0000000..f897a2a
--- /dev/null
+++ b/sysdeps/x86_64/fpu/multiarch/s_nearbyint-c.c
@@ -0,0 +1,3 @@
+#undef __nearbyint
+#define __nearbyint __nearbyint_c
+#include <sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c>
diff --git a/sysdeps/x86_64/fpu/multiarch/s_nearbyint.S b/sysdeps/x86_64/fpu/multiarch/s_nearbyint.S
new file mode 100644
index 0000000..8ed90e7
--- /dev/null
+++ b/sysdeps/x86_64/fpu/multiarch/s_nearbyint.S
@@ -0,0 +1,40 @@
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gmail.come>, 2011.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <machine/asm.h>
+#include <init-arch.h>
+
+
+ENTRY(__nearbyint)
+	.type	__nearbyint, @gnu_indirect_function
+	call	__get_cpu_features@plt
+	movq	%rax, %rdx
+	leaq	__nearbyint_sse41(%rip), %rax
+	testl	$bit_SSE4_1, CPUID_OFFSET+index_SSE4_1(%rdx)
+	jnz	2f
+	leaq	__nearbyint_c(%rip), %rax
+2:	ret
+END(__nearbyint)
+weak_alias (__nearbyint, nearbyint)
+
+
+ENTRY(__nearbyint_sse41)
+	roundsd	$0xc, %xmm0, %xmm0
+	ret
+END(__nearbyint_sse41)
diff --git a/sysdeps/x86_64/fpu/multiarch/s_nearbyintf-c.c b/sysdeps/x86_64/fpu/multiarch/s_nearbyintf-c.c
new file mode 100644
index 0000000..aa77682
--- /dev/null
+++ b/sysdeps/x86_64/fpu/multiarch/s_nearbyintf-c.c
@@ -0,0 +1,3 @@
+#undef __nearbyintf
+#define __nearbyintf __nearbyintf_c
+#include <sysdeps/ieee754/flt-32/s_nearbyintf.c>
diff --git a/sysdeps/x86_64/fpu/multiarch/s_nearbyintf.S b/sysdeps/x86_64/fpu/multiarch/s_nearbyintf.S
new file mode 100644
index 0000000..943f35d
--- /dev/null
+++ b/sysdeps/x86_64/fpu/multiarch/s_nearbyintf.S
@@ -0,0 +1,40 @@
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gmail.come>, 2011.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <machine/asm.h>
+#include <init-arch.h>
+
+
+ENTRY(__nearbyintf)
+	.type	__nearbyintf, @gnu_indirect_function
+	call	__get_cpu_features@plt
+	movq	%rax, %rdx
+	leaq	__nearbyintf_sse41(%rip), %rax
+	testl	$bit_SSE4_1, CPUID_OFFSET+index_SSE4_1(%rdx)
+	jnz	2f
+	leaq	__nearbyintf_c(%rip), %rax
+2:	ret
+END(__nearbyintf)
+weak_alias (__nearbyintf, nearbyintf)
+
+
+ENTRY(__nearbyintf_sse41)
+	roundss	$0xc, %xmm0, %xmm0
+	ret
+END(__nearbyintf_sse41)