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[BZ #4096]

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2007-03-01  Jakub Jelinek  <jakub@redhat.com>
	[BZ #4096]
	* sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Check for NaN
	earlier.
	* math/libm-test.inc (pow_test): Add more tests involving NaNs.

	* sysdeps/i386/fpu/e_powf.S (__ieee754_powf): Avoid invalid exception
	for x qNaN and y either +-inf or non-integer value.
	* sysdeps/i386/fpu/e_pow.S (__ieee754_pow): Likewise.
	* sysdeps/i386/fpu/e_powl.S (__ieee754_powl): Likewise.
	* sysdeps/x86_64/fpu/e_powl.S (__ieee754_powl): Likewise.
This commit is contained in:
Ulrich Drepper 2007-03-05 19:38:56 +00:00
parent 245a1481d7
commit 8f3edfee15
7 changed files with 76 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
ChangeLog
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@ -1,3 +1,16 @@
2007-03-01 Jakub Jelinek <jakub@redhat.com>
[BZ #4096]
* sysdeps/ieee754/dbl-64/e_pow.c (__ieee754_pow): Check for NaN
earlier.
* math/libm-test.inc (pow_test): Add more tests involving NaNs.
* sysdeps/i386/fpu/e_powf.S (__ieee754_powf): Avoid invalid exception
for x qNaN and y either +-inf or non-integer value.
* sysdeps/i386/fpu/e_pow.S (__ieee754_pow): Likewise.
* sysdeps/i386/fpu/e_powl.S (__ieee754_powl): Likewise.
* sysdeps/x86_64/fpu/e_powl.S (__ieee754_powl): Likewise.
2007-02-10 Mike Frysinger <vapier@gentoo.org>
* sysdeps/unix/sysv/linux/sh/Makefile: Remove sys/io.h

11
math/libm-test.inc
View File

@ -4614,6 +4614,17 @@ pow_test (void)
/* pow (x, NaN) == NaN. */
TEST_ff_f (pow, 3.0, nan_value, nan_value);
TEST_ff_f (pow, minus_zero, nan_value, nan_value);
TEST_ff_f (pow, plus_infty, nan_value, nan_value);
TEST_ff_f (pow, -3.0, nan_value, nan_value);
TEST_ff_f (pow, minus_infty, nan_value, nan_value);
TEST_ff_f (pow, nan_value, 3.0, nan_value);
TEST_ff_f (pow, nan_value, -3.0, nan_value);
TEST_ff_f (pow, nan_value, plus_infty, nan_value);
TEST_ff_f (pow, nan_value, minus_infty, nan_value);
TEST_ff_f (pow, nan_value, 2.5, nan_value);
TEST_ff_f (pow, nan_value, -2.5, nan_value);
TEST_ff_f (pow, 1, plus_infty, 1);
TEST_ff_f (pow, -1, plus_infty, 1);

18
sysdeps/i386/fpu/e_pow.S
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@ -1,5 +1,5 @@
/* ix87 specific implementation of pow function.
Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004, 2005
Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004, 2005, 2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@ -161,10 +161,11 @@ ENTRY(__ieee754_pow)
2: /* y is a real number. */
fxch // x : y
fldl MO(one) // 1.0 : x : y
fld %st(1) // x : 1.0 : x : y
fsub %st(1) // x-1 : 1.0 : x : y
fabs // |x-1| : 1.0 : x : y
fcompl MO(limit) // 1.0 : x : y
fldl MO(limit) // 0.29 : 1.0 : x : y
fld %st(2) // x : 0.29 : 1.0 : x : y
fsub %st(2) // x-1 : 0.29 : 1.0 : x : y
fabs // |x-1| : 0.29 : 1.0 : x : y
fucompp // 1.0 : x : y
fnstsw
fxch // x : 1.0 : y
sahf
@ -197,9 +198,10 @@ ENTRY(__ieee754_pow)
// y == ±inf
.align ALIGNARG(4)
12: fstp %st(0) // pop y
fldl 4(%esp) // x
fabs
fcompl MO(one) // < 1, == 1, or > 1
fldl MO(one) // 1
fldl 4(%esp) // x : 1
fabs // abs(x) : 1
fucompp // < 1, == 1, or > 1
fnstsw
andb $0x45, %ah
cmpb $0x45, %ah

18
sysdeps/i386/fpu/e_powf.S
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@ -1,5 +1,5 @@
/* ix87 specific implementation of pow function.
Copyright (C) 1996, 1997, 1999, 2001, 2004, 2005
Copyright (C) 1996, 1997, 1999, 2001, 2004, 2005, 2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@ -155,10 +155,11 @@ ENTRY(__ieee754_powf)
2: /* y is a real number. */
fxch // x : y
fldl MO(one) // 1.0 : x : y
fld %st(1) // x : 1.0 : x : y
fsub %st(1) // x-1 : 1.0 : x : y
fabs // |x-1| : 1.0 : x : y
fcompl MO(limit) // 1.0 : x : y
fldl MO(limit) // 0.29 : 1.0 : x : y
fld %st(2) // x : 0.29 : 1.0 : x : y
fsub %st(2) // x-1 : 0.29 : 1.0 : x : y
fabs // |x-1| : 0.29 : 1.0 : x : y
fucompp // 1.0 : x : y
fnstsw
fxch // x : 1.0 : y
sahf
@ -191,9 +192,10 @@ ENTRY(__ieee754_powf)
// y == ±inf
.align ALIGNARG(4)
12: fstp %st(0) // pop y
flds 4(%esp) // x
fabs
fcompl MO(one) // < 1, == 1, or > 1
fldl MO(one) // 1
flds 4(%esp) // x : 1
fabs // abs(x) : 1
fucompp // < 1, == 1, or > 1
fnstsw
andb $0x45, %ah
cmpb $0x45, %ah

18
sysdeps/i386/fpu/e_powl.S
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@ -1,5 +1,5 @@
/* ix87 specific implementation of pow function.
Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004, 2005
Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004, 2005, 2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@ -161,10 +161,11 @@ ENTRY(__ieee754_powl)
2: /* y is a real number. */
fxch // x : y
fldl MO(one) // 1.0 : x : y
fld %st(1) // x : 1.0 : x : y
fsub %st(1) // x-1 : 1.0 : x : y
fabs // |x-1| : 1.0 : x : y
fcompl MO(limit) // 1.0 : x : y
fldl MO(limit) // 0.29 : 1.0 : x : y
fld %st(2) // x : 0.29 : 1.0 : x : y
fsub %st(2) // x-1 : 0.29 : 1.0 : x : y
fabs // |x-1| : 0.29 : 1.0 : x : y
fucompp // 1.0 : x : y
fnstsw
fxch // x : 1.0 : y
sahf
@ -210,9 +211,10 @@ ENTRY(__ieee754_powl)
// y == ±inf
.align ALIGNARG(4)
12: fstp %st(0) // pop y
fldt 4(%esp) // x
fabs
fcompl MO(one) // < 1, == 1, or > 1
fldl MO(one) // 1
fldt 4(%esp) // x : 1
fabs // abs(x) : 1
fucompp // < 1, == 1, or > 1
fnstsw
andb $0x45, %ah
cmpb $0x45, %ah

22
sysdeps/ieee754/dbl-64/e_pow.c
View File

@ -106,20 +106,28 @@ double __ieee754_pow(double x, double y) {
else
return y < 0 ? 1.0/ABS(x) : 0.0; /* return 0 */
}
qx = u.i[HIGH_HALF]&0x7fffffff; /* no sign */
qy = v.i[HIGH_HALF]&0x7fffffff; /* no sign */
if (qx >= 0x7ff00000 && (qx > 0x7ff00000 || u.i[LOW_HALF] != 0)) return NaNQ.x;
if (qy >= 0x7ff00000 && (qy > 0x7ff00000 || v.i[LOW_HALF] != 0))
return x == 1.0 ? 1.0 : NaNQ.x;
/* if x<0 */
if (u.i[HIGH_HALF] < 0) {
k = checkint(y);
if (k==0) {
if ((v.i[HIGH_HALF] & 0x7fffffff) == 0x7ff00000 && v.i[LOW_HALF] == 0) {
if (qy == 0x7ff00000) {
if (x == -1.0) return 1.0;
else if (x > -1.0) return v.i[HIGH_HALF] < 0 ? INF.x : 0.0;
else return v.i[HIGH_HALF] < 0 ? 0.0 : INF.x;
}
else if (u.i[HIGH_HALF] == 0xfff00000 && u.i[LOW_HALF] == 0)
else if (qx == 0x7ff00000)
return y < 0 ? 0.0 : INF.x;
return NaNQ.x; /* y not integer and x<0 */
}
else if (u.i[HIGH_HALF] == 0xfff00000 && u.i[LOW_HALF] == 0)
else if (qx == 0x7ff00000)
{
if (k < 0)
return y < 0 ? nZERO.x : nINF.x;
@ -129,14 +137,6 @@ double __ieee754_pow(double x, double y) {
return (k==1)?__ieee754_pow(-x,y):-__ieee754_pow(-x,y); /* if y even or odd */
}
/* x>0 */
qx = u.i[HIGH_HALF]&0x7fffffff; /* no sign */
qy = v.i[HIGH_HALF]&0x7fffffff; /* no sign */
if (qx > 0x7ff00000 || (qx == 0x7ff00000 && u.i[LOW_HALF] != 0)) return NaNQ.x;
/* if 0<x<2^-0x7fe */
if (qy > 0x7ff00000 || (qy == 0x7ff00000 && v.i[LOW_HALF] != 0))
return x == 1.0 ? 1.0 : NaNQ.x;
/* if y<2^-0x7fe */
if (qx == 0x7ff00000) /* x= 2^-0x3ff */
{if (y == 0) return NaNQ.x;

19
sysdeps/x86_64/fpu/e_powl.S
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@ -1,5 +1,6 @@
/* ix87 specific implementation of pow function.
Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004 Free Software Foundation, Inc.
Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004, 2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@ -146,10 +147,11 @@ ENTRY(__ieee754_powl)
2: /* y is a real number. */
fxch // x : y
fldl MO(one) // 1.0 : x : y
fld %st(1) // x : 1.0 : x : y
fsub %st(1) // x-1 : 1.0 : x : y
fabs // |x-1| : 1.0 : x : y
fcompl MO(limit) // 1.0 : x : y
fldl MO(limit) // 0.29 : 1.0 : x : y
fld %st(2) // x : 0.29 : 1.0 : x : y
fsub %st(2) // x-1 : 0.29 : 1.0 : x : y
fabs // |x-1| : 0.29 : 1.0 : x : y
fucompp // 1.0 : x : y
fnstsw
fxch // x : 1.0 : y
test $4500,%eax
@ -190,9 +192,10 @@ ENTRY(__ieee754_powl)
// y == ±inf
.align ALIGNARG(4)
12: fstp %st(0) // pop y
fldt 8(%rsp) // x
fabs
fcompl MO(one) // < 1, == 1, or > 1
fldl MO(one) // 1
fldt 8(%rsp) // x : 1
fabs // abs(x) : 1
fucompp // < 1, == 1, or > 1
fnstsw
andb $0x45, %ah
cmpb $0x45, %ah