sysdeps/i386/fpu/e_exp2.S - Issue 3539003: Fix up RET instructions in sysdeps/i386/fpu

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Issue 3539003: Fix up RET instructions in sysdeps/i386/fpu (Closed) Base URL: ssh://gitrw.chromium.org/nacl-glibc

Patch Set: Created 10 years, 2 months ago

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1 /*	1 /*

2 * Written by J.T. Conklin <jtc@netbsd.org>.	2 * Written by J.T. Conklin <jtc@netbsd.org>.

3 * Adapted for exp2 by Ulrich Drepper <drepper@cygnus.com>.	3 * Adapted for exp2 by Ulrich Drepper <drepper@cygnus.com>.

4 * Public domain.	4 * Public domain.

5 */	5 */

6	6

7 #include <machine/asm.h>	7 #include <machine/asm.h>

8	8

9 ENTRY(__ieee754_exp2)	9 ENTRY(__ieee754_exp2)

10 fldl 4(%esp)	10 fldl 4(%esp)

11 /* I added the following ugly construct because exp(+-Inf) resulted	11 /* I added the following ugly construct because exp(+-Inf) resulted

12 in NaN. The ugliness results from the bright minds at Intel.	12 in NaN. The ugliness results from the bright minds at Intel.

13 For the i686 the code can be written better.	13 For the i686 the code can be written better.

14 -- drepper@cygnus.com. */	14 -- drepper@cygnus.com. */

15 fxam /* Is NaN or +-Inf? */	15 fxam /* Is NaN or +-Inf? */

16 fstsw %ax	16 fstsw %ax

17 movb $0x45, %dh	17 movb $0x45, %dh

18 andb %ah, %dh	18 andb %ah, %dh

19 cmpb $0x05, %dh	19 cmpb $0x05, %dh

20 je 1f /* Is +-Inf, jump. */	20 je 1f /* Is +-Inf, jump. */

21 fld %st	21 fld %st

22 frndint /* int(x) */	22 frndint /* int(x) */

23 fsubr %st,%st(1) /* fract(x) */	23 fsubr %st,%st(1) /* fract(x) */

24 fxch	24 fxch

25 f2xm1 /* 2^(fract(x)) - 1 */	25 f2xm1 /* 2^(fract(x)) - 1 */

26 fld1	26 fld1

27 faddp /* 2^(fract(x)) */	27 faddp /* 2^(fract(x)) */

28 fscale /* e^x */	28 fscale /* e^x */

29 fstp %st(1)	29 fstp %st(1)

30 » ret	30 » NACLRET

31	31

32 1: testl $0x200, %eax /* Test sign. */	32 1: testl $0x200, %eax /* Test sign. */

33 jz 2f /* If positive, jump. */	33 jz 2f /* If positive, jump. */

34 fstp %st	34 fstp %st

35 fldz /* Set result to 0. */	35 fldz /* Set result to 0. */

36 2:» ret	36 2:» NACLRET

37 END (__ieee754_exp2)	37 END (__ieee754_exp2)

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