mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-27 03:41:23 +08:00
09096b3615
The i386/x86_64 versions of log10l return sNaN for sNaN input. This patch fixes them to add a NaN input to itself so that qNaN is returned in this case. Tested for x86_64 and x86. [BZ #20228] * sysdeps/i386/fpu/e_log10l.S (__ieee754_log10l): Add NaN input to itself. * sysdeps/x86_64/fpu/e_log10l.S (__ieee754_log10l): Likewise. * math/libm-test.inc (log10_test_data): Add sNaN tests.
72 lines
1.4 KiB
ArmAsm
72 lines
1.4 KiB
ArmAsm
/*
|
|
* Written by J.T. Conklin <jtc@netbsd.org>.
|
|
* Public domain.
|
|
*
|
|
* Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
|
|
*
|
|
* Changed to use fyl2xp1 for values near 1, <drepper@cygnus.com>.
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
.section .rodata.cst8,"aM",@progbits,8
|
|
|
|
.p2align 3
|
|
.type one,@object
|
|
one: .double 1.0
|
|
ASM_SIZE_DIRECTIVE(one)
|
|
/* It is not important that this constant is precise. It is only
|
|
a value which is known to be on the safe side for using the
|
|
fyl2xp1 instruction. */
|
|
.type limit,@object
|
|
limit: .double 0.29
|
|
ASM_SIZE_DIRECTIVE(limit)
|
|
|
|
|
|
#ifdef PIC
|
|
# define MO(op) op##@GOTOFF(%edx)
|
|
#else
|
|
# define MO(op) op
|
|
#endif
|
|
|
|
.text
|
|
ENTRY(__ieee754_log10l)
|
|
fldlg2 // log10(2)
|
|
fldt 4(%esp) // x : log10(2)
|
|
#ifdef PIC
|
|
LOAD_PIC_REG (dx)
|
|
#endif
|
|
fxam
|
|
fnstsw
|
|
fld %st // x : x : log10(2)
|
|
sahf
|
|
jc 3f // in case x is NaN or ±Inf
|
|
4: fsubl MO(one) // x-1 : x : log10(2)
|
|
fld %st // x-1 : x-1 : x : log10(2)
|
|
fabs // |x-1| : x-1 : x : log10(2)
|
|
fcompl MO(limit) // x-1 : x : log10(2)
|
|
fnstsw // x-1 : x : log10(2)
|
|
andb $0x45, %ah
|
|
jz 2f
|
|
fxam
|
|
fnstsw
|
|
andb $0x45, %ah
|
|
cmpb $0x40, %ah
|
|
jne 5f
|
|
fabs // log10(1) is +0 in all rounding modes.
|
|
5: fstp %st(1) // x-1 : log10(2)
|
|
fyl2xp1 // log10(x)
|
|
ret
|
|
|
|
2: fstp %st(0) // x : log10(2)
|
|
fyl2x // log10(x)
|
|
ret
|
|
|
|
3: jp 4b // in case x is ±Inf
|
|
fstp %st(1)
|
|
fstp %st(1)
|
|
fadd %st(0)
|
|
ret
|
|
END(__ieee754_log10l)
|
|
strong_alias (__ieee754_log10l, __log10l_finite)
|