mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 13:50:06 +00:00
220622dde5
This patch adds a new macro, libm_alias_finite, to define all _finite symbol. It sets all _finite symbol as compat symbol based on its first version (obtained from the definition at built generated first-versions.h). The <fn>f128_finite symbols were introduced in GLIBC 2.26 and so need special treatment in code that is shared between long double and float128. It is done by adding a list, similar to internal symbol redifinition, on sysdeps/ieee754/float128/float128_private.h. Alpha also needs some tricky changes to ensure we still emit 2 compat symbols for sqrt(f). Passes buildmanyglibc. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
62 lines
1.3 KiB
ArmAsm
62 lines
1.3 KiB
ArmAsm
/*
|
|
* Written by J.T. Conklin <jtc@netbsd.org>.
|
|
* Adapted for exp2 by Ulrich Drepper <drepper@cygnus.com>.
|
|
* Public domain.
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
#include <i386-math-asm.h>
|
|
#include <libm-alias-finite.h>
|
|
|
|
DEFINE_LDBL_MIN
|
|
|
|
#ifdef PIC
|
|
# define MO(op) op##@GOTOFF(%ecx)
|
|
#else
|
|
# define MO(op) op
|
|
#endif
|
|
|
|
.text
|
|
ENTRY(__ieee754_exp2l)
|
|
#ifdef PIC
|
|
LOAD_PIC_REG (cx)
|
|
#endif
|
|
fldt 4(%esp)
|
|
/* I added the following ugly construct because exp(+-Inf) resulted
|
|
in NaN. The ugliness results from the bright minds at Intel.
|
|
For the i686 the code can be written better.
|
|
-- drepper@cygnus.com. */
|
|
fxam /* Is NaN or +-Inf? */
|
|
fstsw %ax
|
|
movb $0x45, %dh
|
|
andb %ah, %dh
|
|
cmpb $0x05, %dh
|
|
je 1f /* Is +-Inf, jump. */
|
|
movzwl 4+8(%esp), %eax
|
|
andl $0x7fff, %eax
|
|
cmpl $0x3fbe, %eax
|
|
jge 3f
|
|
/* Argument's exponent below -65, result rounds to 1. */
|
|
fld1
|
|
faddp
|
|
ret
|
|
3: fld %st
|
|
frndint /* int(x) */
|
|
fsubr %st,%st(1) /* fract(x) */
|
|
fxch
|
|
f2xm1 /* 2^(fract(x)) - 1 */
|
|
fld1
|
|
faddp /* 2^(fract(x)) */
|
|
fscale /* e^x */
|
|
fstp %st(1)
|
|
LDBL_CHECK_FORCE_UFLOW_NONNEG_NAN
|
|
ret
|
|
|
|
1: testl $0x200, %eax /* Test sign. */
|
|
jz 2f /* If positive, jump. */
|
|
fstp %st
|
|
fldz /* Set result to 0. */
|
|
2: ret
|
|
END (__ieee754_exp2l)
|
|
libm_alias_finite (__ieee754_exp2l, __exp2l)
|