alpha: Use builtin sqrt{f}

The generic implementation is simplified by removing the
'optimization' for !_IEEE_FP_INEXACT (which does not handle
inexact neither some values).

Checked on alpha-linux-gnu.

1 files changed, 2 insertions, 162 deletions

diff --git a/sysdeps/alpha/fpu/e_sqrt.c b/sysdeps/alpha/fpu/e_sqrt.c
index 4cf2ad693a..c75ed07bd6 100644
--- a/sysdeps/alpha/fpu/e_sqrt.c
+++ b/sysdeps/alpha/fpu/e_sqrt.c
@@ -16,171 +16,11 @@
    License along with the GNU C Library.  If not, see
    <https://www.gnu.org/licenses/>.  */
 
-#include <math.h>
-#include <math_private.h>
 #include <shlib-compat.h>
 
-#if !defined(_IEEE_FP_INEXACT)
-
-/*
- * This version is much faster than generic sqrt implementation, but
- * it doesn't handle the inexact flag.  It doesn't handle exceptional
- * values either, but will defer to the full ieee754_sqrt routine which
- * can.
- */
-
-/* Careful with rearranging this without consulting the assembly below.  */
-const static struct sqrt_data_struct {
-	unsigned long dn, up, half, almost_three_half;
-	unsigned long one_and_a_half, two_to_minus_30, one, nan;
-	const int T2[64];
-} sqrt_data __attribute__((used)) = {
-	0x3fefffffffffffff,	/* __dn = nextafter(1,-Inf) */
-	0x3ff0000000000001,	/* __up = nextafter(1,+Inf) */
-	0x3fe0000000000000,	/* half */
-	0x3ff7ffffffc00000,	/* almost_three_half = 1.5-2^-30 */
-	0x3ff8000000000000,	/* one_and_a_half */
-	0x3e10000000000000,	/* two_to_minus_30 */
-	0x3ff0000000000000,	/* one */
-	0xffffffffffffffff,	/* nan */
-
-	{ 0x1500, 0x2ef8, 0x4d67, 0x6b02, 0x87be, 0xa395, 0xbe7a, 0xd866,
-	0xf14a, 0x1091b,0x11fcd,0x13552,0x14999,0x15c98,0x16e34,0x17e5f,
-	0x18d03,0x19a01,0x1a545,0x1ae8a,0x1b5c4,0x1bb01,0x1bfde,0x1c28d,
-	0x1c2de,0x1c0db,0x1ba73,0x1b11c,0x1a4b5,0x1953d,0x18266,0x16be0,
-	0x1683e,0x179d8,0x18a4d,0x19992,0x1a789,0x1b445,0x1bf61,0x1c989,
-	0x1d16d,0x1d77b,0x1dddf,0x1e2ad,0x1e5bf,0x1e6e8,0x1e654,0x1e3cd,
-	0x1df2a,0x1d635,0x1cb16,0x1be2c,0x1ae4e,0x19bde,0x1868e,0x16e2e,
-	0x1527f,0x1334a,0x11051,0xe951, 0xbe01, 0x8e0d, 0x5924, 0x1edd }
-};
-
-asm ("\
-  /* Define offsets into the structure defined in C above.  */		\n\
-	$DN = 0*8							\n\
-	$UP = 1*8							\n\
-	$HALF = 2*8							\n\
-	$ALMOST_THREE_HALF = 3*8					\n\
-	$NAN = 7*8							\n\
-	$T2 = 8*8							\n\
-									\n\
-  /* Stack variables.  */						\n\
-	$K = 0								\n\
-	$Y = 8								\n\
-									\n\
-	.text								\n\
-	.align	5							\n\
-	.globl	__ieee754_sqrt						\n\
-	.ent	__ieee754_sqrt						\n\
-__ieee754_sqrt:								\n\
-	ldgp	$29, 0($27)						\n\
-	subq	$sp, 16, $sp						\n\
-	.frame	$sp, 16, $26, 0\n"
-#ifdef PROF
-"	lda	$28, _mcount						\n\
-	jsr	$28, ($28), _mcount\n"
-#endif
-"	.prologue 1							\n\
-									\n\
-	.align 4							\n\
-	stt	$f16, $K($sp)		# e0    :			\n\
-	mult	$f31, $f31, $f31	# .. fm :			\n\
-	lda	$4, sqrt_data		# e0    :			\n\
-	fblt	$f16, $fixup		# .. fa :			\n\
-									\n\
-	ldah	$2, 0x5fe8		# e0    :			\n\
-	ldq	$3, $K($sp)		# .. e1 :			\n\
-	ldt	$f12, $HALF($4)		# e0    :			\n\
-	ldt	$f18, $ALMOST_THREE_HALF($4)	# .. e1 :		\n\
-									\n\
-	sll	$3, 52, $5		# e0    :			\n\
-	lda	$6, 0x7fd		# .. e1 :			\n\
-	fnop				# .. fa :			\n\
-	fnop				# .. fm :			\n\
-									\n\
-	subq	$5, 1, $5		# e1    :			\n\
-	srl	$3, 33, $1		# .. e0 :			\n\
-	cmpule	$5, $6, $5		# e0    :			\n\
-	beq	$5, $fixup		# .. e1 :			\n\
-									\n\
-	mult	$f16, $f12, $f11	# fm    : $f11 = x * 0.5	\n\
-	subl	$2, $1, $2		# .. e0 :			\n\
-	addt	$f12, $f12, $f17	# .. fa : $f17 = 1.0		\n\
-	srl	$2, 12, $1		# e0    :			\n\
-									\n\
-	and	$1, 0xfc, $1		# e0    :			\n\
-	addq	$1, $4, $1		# e1    :			\n\
-	ldl	$1, $T2($1)		# e0    :			\n\
-	addt	$f12, $f17, $f15	# .. fa : $f15 = 1.5		\n\
-									\n\
-	subl	$2, $1, $2		# e0    :			\n\
-	ldt	$f14, $DN($4)		# .. e1 :			\n\
-	sll	$2, 32, $2		# e0    :			\n\
-	stq	$2, $Y($sp)		# e0    :			\n\
-									\n\
-	ldt	$f13, $Y($sp)		# e0    :			\n\
-	mult/su	$f11, $f13, $f10	# fm   2: $f10 = (x * 0.5) * y	\n\
-	mult	$f10, $f13, $f10	# fm   4: $f10 = ((x*0.5)*y)*y	\n\
-	subt	$f15, $f10, $f1		# fa   4: $f1 = (1.5-0.5*x*y*y)	\n\
-									\n\
-	mult	$f13, $f1, $f13         # fm   4: yp = y*(1.5-0.5*x*y^2)\n\
-	mult/su	$f11, $f13, $f1		# fm   4: $f11 = x * 0.5 * yp	\n\
-	mult	$f1, $f13, $f11		# fm   4: $f11 = (x*0.5*yp)*yp	\n\
-	subt	$f18, $f11, $f1		# fa   4: $f1=(1.5-2^-30)-x/2*yp^2\n\
-									\n\
-	mult	$f13, $f1, $f13		# fm   4: ypp = $f13 = yp*$f1	\n\
-	subt	$f15, $f12, $f1		# .. fa : $f1 = (1.5 - 0.5)	\n\
-	ldt	$f15, $UP($4)		# .. e0 :			\n\
-	mult/su	$f16, $f13, $f10	# fm   4: z = $f10 = x * ypp	\n\
-									\n\
-	mult	$f10, $f13, $f11	# fm   4: $f11 = z*ypp		\n\
-	mult	$f10, $f12, $f12	# fm    : $f12 = z*0.5		\n\
-	subt	$f1, $f11, $f1		# fa   4: $f1 = 1 - z*ypp	\n\
-	mult	$f12, $f1, $f12		# fm   4: $f12 = z/2*(1 - z*ypp)\n\
-									\n\
-	addt	$f10, $f12, $f0		# fa   4: zp=res= z+z/2*(1-z*ypp)\n\
-	mult/c	$f0, $f14, $f12		# fm   4: zmi = zp * DN		\n\
-	mult/c	$f0, $f15, $f11		# fm    : zpl = zp * UP		\n\
-	mult/c	$f0, $f12, $f1		# fm    : $f1 = zp * zmi	\n\
-									\n\
-	mult/c	$f0, $f11, $f15		# fm    : $f15 = zp * zpl	\n\
-	subt/su	$f1, $f16, $f13		# .. fa : y1 = zp*zmi - x	\n\
-	subt/su	$f15, $f16, $f14	# fa   4: y2 = zp*zpl - x	\n\
-	fcmovge	$f13, $f12, $f0		# fa   3: res = (y1>=0)?zmi:res	\n\
-									\n\
-	fcmovlt	$f14, $f11, $f0		# fa   4: res = (y2<0)?zpl:res	\n\
-	addq	$sp, 16, $sp		# .. e0 :			\n\
-	ret				# .. e1 :			\n\
-									\n\
-	.align 4							\n\
-$fixup:									\n\
-	addq	$sp, 16, $sp						\n\
-	br	__full_ieee754_sqrt	!samegp				\n\
-									\n\
-	.end	__ieee754_sqrt");
-
-#if SHLIB_COMPAT (libm, GLIBC_2_15, GLIBC_2_18)
-asm (".global  __sqrt_dummy; __sqrt_dummy = __ieee754_sqrt");
-#else
-asm (".global  __sqrt_finite; __sqrt_finite = __ieee754_sqrt");
-#endif
-
-static double __full_ieee754_sqrt(double) __attribute_used__;
-#define __ieee754_sqrt __full_ieee754_sqrt
-
-#elif SHLIB_COMPAT (libm, GLIBC_2_15, GLIBC_2_18)
-
-strong_alias (__ieee754_sqrt, __sqrt_dummy)
-#define __ieee754_sqrt __ieee754_sqrt
-
-#endif /* _IEEE_FP_INEXACT */
-
 #include <sysdeps/ieee754/dbl-64/e_sqrt.c>
-#undef __ieee754_sqrt
 
-/* Work around forgotten symbol in alphaev6 build.  */
-#if SHLIB_COMPAT (libm, GLIBC_2_15, GLIBC_2_18)
-compat_symbol (libm, __sqrt_dummy, __sqrt_finite, GLIBC_2_15);
-#endif
 #if SHLIB_COMPAT (libm, GLIBC_2_18, GLIBC_2_31)
-compat_symbol (libm, __ieee754_sqrt, __sqrt_finite, GLIBC_2_18);
+strong_alias (__ieee754_sqrt, __sqrt_finite_2_18)
+compat_symbol (libm, __sqrt_finite_2_18, __sqrt_finite, GLIBC_2_18);
 #endif