Provide internal optimizations on x86-64 with SSE4.1

Provide macros so that the internal users can, if possible, directly use
the new instructions.

Also fix up the mathinline.h header when compiling with SSE4.1 enabled.

ChangeLog

@@ -1,5 +1,15 @@
 2011-10-17  Ulrich Drepper  <drepper@gmail.com>
 
+	* sysdeps/x86_64/fpu/bits/mathinline.h: Don't define inlines if
+	__NO_MATH_INLINES is defined.  Cleanups.
+
+	* sysdeps/x86_64/fpu/math_private.h: Define __rint, __rintf, __floor,
+	and __floorf is target has SSE4.1.
+	* sysdeps/x86_64/fpu/multiarch/s_floor-c.c: Undef first.
+	* sysdeps/x86_64/fpu/multiarch/s_floorf-c.: Likewise.
+	* sysdeps/x86_64/fpu/multiarch/s_rint-c.c: Likewise.
+	* sysdeps/x86_64/fpu/multiarch/s_rintf-c.c: Likewise.
+
 	* sysdeps/x86_64/fpu/bits/mathinline.h (floor): Use correct function
 	name.
 	(floorf): Likewise.

sysdeps/x86_64/fpu/bits/mathinline.h

@@ -30,34 +30,35 @@
 #endif
 
 
-#if defined __GNUC__ && __GNUC__ >= 2
-# ifdef __USE_ISOC99
+/* The gcc, version 2.7 or below, has problems with all this inlining
+   code.  So disable it for this version of the compiler.  */
+#if __GNUC_PREREQ (2, 8) && defined __USE_ISOC99
 __BEGIN_NAMESPACE_C99
 
 /* Test for negative number.  Used in the signbit() macro.  */
 __MATH_INLINE int
 __NTH (__signbitf (float __x))
 {
-#  if __WORDSIZE == 32
+# if __WORDSIZE == 32
   __extension__ union { float __f; int __i; } __u = { __f: __x };
   return __u.__i < 0;
-#  else
+# else
   int __m;
   __asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x));
   return __m & 0x8;
-#  endif
+# endif
 }
 __MATH_INLINE int
 __NTH (__signbit (double __x))
 {
-#  if __WORDSIZE == 32
+# if __WORDSIZE == 32
   __extension__ union { double __d; int __i[2]; } __u = { __d: __x };
   return __u.__i[1] < 0;
-#  else
+# else
   int __m;
   __asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x));
   return __m & 0x80;
-#  endif
+# endif
 }
 __MATH_INLINE int
 __NTH (__signbitl (long double __x))
@@ -66,6 +67,16 @@ __NTH (__signbitl (long double __x))
   return (__u.__i[2] & 0x8000) != 0;
 }
 
+__END_NAMESPACE_C99
+#endif
+
+
+#if (__GNUC_PREREQ (2, 8) && !defined __NO_MATH_INLINES \
+     && defined __OPTIMIZE__)
+
+# ifdef __USE_ISOC99
+__BEGIN_NAMESPACE_C99
+
 /* Round to nearest integer.  */
 #  if __WORDSIZE == 64 || defined __SSE_MATH__
 __MATH_INLINE long int
@@ -100,14 +111,10 @@ __NTH (llrint (double __x))
   __asm ("cvtsd2si %1, %0" : "=r" (__res) : "xm" (__x));
   return __res;
 }
-
-__END_NAMESPACE_C99
 #  endif
 
 #  if defined __FINITE_MATH_ONLY__ && __FINITE_MATH_ONLY__ > 0 \
       && (__WORDSIZE == 64 || defined __SSE2_MATH__)
-__BEGIN_NAMESPACE_C99
-
 /* Determine maximum of two values.  */
 __MATH_INLINE float
 __NTH (fmaxf (float __x, float __y))

sysdeps/x86_64/fpu/math_private.h

@@ -90,3 +90,31 @@ do {								\
   ({ long double __res;							      \
      asm ("fsqrt" : "=t" (__res) : "0" ((long double) d));		      \
      __res; })
+
+#ifdef __SSE4_1__
+# ifndef __rint
+#  define __rint(d) \
+  ({ double __res; \
+     asm ("roundsd $4, %1, %0" : "=x" (__res) : "x" ((double) d));	      \
+     __res; })
+# endif
+# ifndef __rintf
+#  define __rintf(d) \
+  ({ float __res; \
+     asm ("roundss $4, %1, %0" : "=x" (__res) : "x" ((float) d));	      \
+     __res; })
+# endif
+
+# ifndef __floor
+#  define __floor(d) \
+  ({ double __res; \
+     asm ("roundsd $1, %1, %0" : "=x" (__res) : "x" ((double) d));	      \
+     __res; })
+# endif
+# ifndef __floorf
+#  define __floorf(d) \
+  ({ float __res; \
+     asm ("roundss $1, %1, %0" : "=x" (__res) : "x" ((float) d));	      \
+     __res; })
+# endif
+#endif

sysdeps/x86_64/fpu/multiarch/s_floor-c.c

@@ -1,2 +1,3 @@
+#undef __floor
 #define __floor __floor_c
 #include <sysdeps/ieee754/dbl-64/wordsize-64/s_floor.c>

sysdeps/x86_64/fpu/multiarch/s_floorf-c.c

@@ -1,2 +1,3 @@
+#undef __floorf
 #define __floorf __floorf_c
 #include <sysdeps/ieee754/flt-32/s_floorf.c>

sysdeps/x86_64/fpu/multiarch/s_rint-c.c

@@ -1,2 +1,3 @@
+#undef __rint
 #define __rint __rint_c
 #include <sysdeps/ieee754/dbl-64/wordsize-64/s_rint.c>

sysdeps/x86_64/fpu/multiarch/s_rintf-c.c

@@ -1,2 +1,3 @@
+#undef __rintf
 #define __rintf __rintf_c
 #include <sysdeps/ieee754/flt-32/s_rintf.c>