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-rw-r--r--ChangeLog14
-rw-r--r--math/libm-test.inc41
-rw-r--r--sysdeps/i386/fpu/e_pow.S14
-rw-r--r--sysdeps/i386/fpu/e_powl.S25
-rw-r--r--sysdeps/x86_64/fpu/e_powl.S24
5 files changed, 114 insertions, 4 deletions
diff --git a/ChangeLog b/ChangeLog
index 6083c205e7..5f4fc034a5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,17 @@
+2004-07-19 Jakub Jelinek <jakub@redhat.com>
+
+ [BZ #258]
+ * math/libm-test.inc (max_value, min_value): New variables.
+ (initialize): Initialize them.
+ (pow_test): Add a couple of new tests.
+ * sysdeps/i386/fpu/e_powf.S (__ieee754_powf): Don't generate invalid
+ exception if |y| >= 1U<<31.
+ * sysdeps/i386/fpu/e_pow.S (__ieee754_pow): Don't generate invalid
+ exception if |y| >= 1L<<63.
+ * sysdeps/i386/fpu/e_powl.S (__ieee754_powl): Likewise.
+ If y*log2(x) overflows to +-inf, return still +inf/+0 instead of NaN.
+ * sysdeps/x86_64/fpu/e_powl.S (__ieee754_powl): Likewise.
+
2004-07-18 Ulrich Drepper <drepper@redhat.com>
* nscd/pwdcache.c (cache_addpw): Optimize case of unsuccessful
diff --git a/math/libm-test.inc b/math/libm-test.inc
index bad3948f1d..729fce9369 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -169,7 +169,7 @@ static int output_points; /* Should the single function results printed? */
static int ignore_max_ulp; /* Should we ignore max_ulp? */
static FLOAT minus_zero, plus_zero;
-static FLOAT plus_infty, minus_infty, nan_value;
+static FLOAT plus_infty, minus_infty, nan_value, max_value, min_value;
static FLOAT max_error, real_max_error, imag_max_error;
@@ -3593,6 +3593,28 @@ pow_test (void)
TEST_ff_f (pow, -1, plus_infty, 1);
TEST_ff_f (pow, 1, minus_infty, 1);
TEST_ff_f (pow, -1, minus_infty, 1);
+ TEST_ff_f (pow, 1, 1, 1);
+ TEST_ff_f (pow, 1, -1, 1);
+ TEST_ff_f (pow, 1, 1.25, 1);
+ TEST_ff_f (pow, 1, -1.25, 1);
+ TEST_ff_f (pow, 1, 0x1p62L, 1);
+ TEST_ff_f (pow, 1, 0x1p63L, 1);
+ TEST_ff_f (pow, 1, 0x1p64L, 1);
+ TEST_ff_f (pow, 1, 0x1p72L, 1);
+
+ /* pow (x, +-0) == 1. */
+ TEST_ff_f (pow, plus_infty, 0, 1);
+ TEST_ff_f (pow, plus_infty, minus_zero, 1);
+ TEST_ff_f (pow, minus_infty, 0, 1);
+ TEST_ff_f (pow, minus_infty, minus_zero, 1);
+ TEST_ff_f (pow, 32.75L, 0, 1);
+ TEST_ff_f (pow, 32.75L, minus_zero, 1);
+ TEST_ff_f (pow, -32.75L, 0, 1);
+ TEST_ff_f (pow, -32.75L, minus_zero, 1);
+ TEST_ff_f (pow, 0x1p72L, 0, 1);
+ TEST_ff_f (pow, 0x1p72L, minus_zero, 1);
+ TEST_ff_f (pow, 0x1p-72L, 0, 1);
+ TEST_ff_f (pow, 0x1p-72L, minus_zero, 1);
TEST_ff_f (pow, -0.1L, 1.1L, nan_value, INVALID_EXCEPTION);
TEST_ff_f (pow, -0.1L, -1.1L, nan_value, INVALID_EXCEPTION);
@@ -3609,6 +3631,10 @@ pow_test (void)
TEST_ff_f (pow, minus_zero, -2, plus_infty, DIVIDE_BY_ZERO_EXCEPTION);
TEST_ff_f (pow, minus_zero, -11.1L, plus_infty, DIVIDE_BY_ZERO_EXCEPTION);
+ TEST_ff_f (pow, 0x1p72L, 0x1p72L, plus_infty);
+ TEST_ff_f (pow, 10, -0x1p72L, 0);
+ TEST_ff_f (pow, max_value, max_value, plus_infty);
+ TEST_ff_f (pow, 10, -max_value, 0);
TEST_ff_f (pow, 0, 1, 0);
TEST_ff_f (pow, 0, 11, 0);
@@ -3623,6 +3649,8 @@ pow_test (void)
TEST_ff_f (pow, minus_zero, 2, 0);
TEST_ff_f (pow, minus_zero, 11.1L, 0);
+ TEST_ff_f (pow, 0, plus_infty, 0);
+ TEST_ff_f (pow, minus_zero, plus_infty, 0);
#ifndef TEST_INLINE
/* pow (x, +inf) == +inf for |x| > 1. */
@@ -3667,6 +3695,11 @@ pow_test (void)
/* pow (-0, y) == +0 for y > 0 and not an odd integer. */
TEST_ff_f (pow, minus_zero, 4, 0.0);
+ TEST_ff_f (pow, 16, 0.25L, 2);
+ TEST_ff_f (pow, 0x1p64L, 0.125L, 256);
+ TEST_ff_f (pow, 2, 4, 16);
+ TEST_ff_f (pow, 256, 8, 0x1p64L);
+
TEST_ff_f (pow, 0.75L, 1.25L, 0.697953644326574699205914060237425566L);
#if defined TEST_DOUBLE || defined TEST_LDOUBLE
@@ -4312,12 +4345,18 @@ initialize (void)
HUGE_VALL, HUGE_VAL, HUGE_VALF);
minus_infty = CHOOSE (-HUGE_VALL, -HUGE_VAL, -HUGE_VALF,
-HUGE_VALL, -HUGE_VAL, -HUGE_VALF);
+ max_value = CHOOSE (LDBL_MAX, DBL_MAX, FLT_MAX,
+ LDBL_MAX, DBL_MAX, FLT_MAX);
+ min_value = CHOOSE (LDBL_MIN, DBL_MIN, FLT_MIN,
+ LDBL_MIN, DBL_MIN, FLT_MIN);
(void) &plus_zero;
(void) &nan_value;
(void) &minus_zero;
(void) &plus_infty;
(void) &minus_infty;
+ (void) &max_value;
+ (void) &min_value;
/* Clear all exceptions. From now on we must not get random exceptions. */
feclearexcept (FE_ALL_EXCEPT);
diff --git a/sysdeps/i386/fpu/e_pow.S b/sysdeps/i386/fpu/e_pow.S
index 997dd30e9d..d100c0ac57 100644
--- a/sysdeps/i386/fpu/e_pow.S
+++ b/sysdeps/i386/fpu/e_pow.S
@@ -1,5 +1,6 @@
/* ix87 specific implementation of pow function.
- Copyright (C) 1996, 1997, 1998, 1999, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004
+ Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@@ -48,6 +49,9 @@ one: .double 1.0
ASM_TYPE_DIRECTIVE(limit,@object)
limit: .double 0.29
ASM_SIZE_DIRECTIVE(limit)
+ ASM_TYPE_DIRECTIVE(p63,@object)
+p63: .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x43
+ ASM_SIZE_DIRECTIVE(p63)
#ifdef PIC
#define MO(op) op##@GOTOFF(%ecx)
@@ -96,6 +100,14 @@ ENTRY(__ieee754_pow)
fxch // y : x
+ /* fistpll raises invalid exception for |y| >= 1L<<63. */
+ fld %st // y : y : x
+ fabs // |y| : y : x
+ fcompl MO(p63) // y : x
+ fnstsw
+ sahf
+ jnc 2f
+
/* First see whether `y' is a natural number. In this case we
can use a more precise algorithm. */
fld %st // y : y : x
diff --git a/sysdeps/i386/fpu/e_powl.S b/sysdeps/i386/fpu/e_powl.S
index 5d82571128..080764b84a 100644
--- a/sysdeps/i386/fpu/e_powl.S
+++ b/sysdeps/i386/fpu/e_powl.S
@@ -1,5 +1,6 @@
/* ix87 specific implementation of pow function.
- Copyright (C) 1996, 1997, 1998, 1999, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004
+ Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@@ -48,6 +49,9 @@ one: .double 1.0
ASM_TYPE_DIRECTIVE(limit,@object)
limit: .double 0.29
ASM_SIZE_DIRECTIVE(limit)
+ ASM_TYPE_DIRECTIVE(p63,@object)
+p63: .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x43
+ ASM_SIZE_DIRECTIVE(p63)
#ifdef PIC
#define MO(op) op##@GOTOFF(%ecx)
@@ -96,6 +100,14 @@ ENTRY(__ieee754_powl)
fxch // y : x
+ /* fistpll raises invalid exception for |y| >= 1L<<63. */
+ fld %st // y : y : x
+ fabs // |y| : y : x
+ fcompl MO(p63) // y : x
+ fnstsw
+ sahf
+ jnc 2f
+
/* First see whether `y' is a natural number. In this case we
can use a more precise algorithm. */
fld %st // y : y : x
@@ -161,6 +173,11 @@ ENTRY(__ieee754_powl)
7: fyl2x // log2(x) : y
8: fmul %st(1) // y*log2(x) : y
+ fxam
+ fnstsw
+ andb $0x45, %ah
+ cmpb $0x05, %ah // is y*log2(x) == ±inf ?
+ je 28f
fst %st(1) // y*log2(x) : y*log2(x)
frndint // int(y*log2(x)) : y*log2(x)
fsubr %st, %st(1) // int(y*log2(x)) : fract(y*log2(x))
@@ -172,6 +189,12 @@ ENTRY(__ieee754_powl)
fstp %st(1) // 2^fract(y*log2(x))*2^int(y*log2(x))
ret
+28: fstp %st(1) // y*log2(x)
+ fldl MO(one) // 1 : y*log2(x)
+ fscale // 2^(y*log2(x)) : y*log2(x)
+ addl $8, %esp
+ fstp %st(1) // 2^(y*log2(x))
+ ret
// pow(x,±0) = 1
.align ALIGNARG(4)
diff --git a/sysdeps/x86_64/fpu/e_powl.S b/sysdeps/x86_64/fpu/e_powl.S
index 8c690e16cc..85f4deb3c7 100644
--- a/sysdeps/x86_64/fpu/e_powl.S
+++ b/sysdeps/x86_64/fpu/e_powl.S
@@ -1,5 +1,5 @@
/* ix87 specific implementation of pow function.
- Copyright (C) 1996, 1997, 1998, 1999, 2001 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
@@ -48,6 +48,10 @@ one: .double 1.0
ASM_TYPE_DIRECTIVE(limit,@object)
limit: .double 0.29
ASM_SIZE_DIRECTIVE(limit)
+ ASM_TYPE_DIRECTIVE(p63,@object)
+p63:
+ .byte 0, 0, 0, 0, 0, 0, 0xe0, 0x43
+ ASM_SIZE_DIRECTIVE(p63)
#ifdef PIC
#define MO(op) op##(%rip)
@@ -87,6 +91,14 @@ ENTRY(__ieee754_powl)
fxch // y : x
+ /* fistpll raises invalid exception for |y| >= 1L<<63. */
+ fldl MO(p63) // 1L<<63 : y : x
+ fld %st(1) // y : 1L<<63 : y : x
+ fabs // |y| : 1L<<63 : y : x
+ fcomip %st(1), %st // 1L<<63 : y : x
+ fstp %st(0) // y : x
+ jnc 2f
+
/* First see whether `y' is a natural number. In this case we
can use a more precise algorithm. */
fld %st // y : y : x
@@ -148,6 +160,11 @@ ENTRY(__ieee754_powl)
7: fyl2x // log2(x) : y
8: fmul %st(1) // y*log2(x) : y
+ fxam
+ fnstsw
+ andb $0x45, %ah
+ cmpb $0x05, %ah // is y*log2(x) == ±inf ?
+ je 28f
fst %st(1) // y*log2(x) : y*log2(x)
frndint // int(y*log2(x)) : y*log2(x)
fsubr %st, %st(1) // int(y*log2(x)) : fract(y*log2(x))
@@ -158,6 +175,11 @@ ENTRY(__ieee754_powl)
fstp %st(1) // 2^fract(y*log2(x))*2^int(y*log2(x))
ret
+28: fstp %st(1) // y*log2(x)
+ fldl MO(one) // 1 : y*log2(x)
+ fscale // 2^(y*log2(x)) : y*log2(x)
+ fstp %st(1) // 2^(y*log2(x))
+ ret
// pow(x,±0) = 1
.align ALIGNARG(4)
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-20 21:04:29 +0000