glibc/sysdeps/i386/fpu/e_scalbl.S
Siddhesh Poyarekar 30891f35fa Remove "Contributed by" lines
We stopped adding "Contributed by" or similar lines in sources in 2012
in favour of git logs and keeping the Contributors section of the
glibc manual up to date.  Removing these lines makes the license
header a bit more consistent across files and also removes the
possibility of error in attribution when license blocks or files are
copied across since the contributed-by lines don't actually reflect
reality in those cases.

Move all "Contributed by" and similar lines (Written by, Test by,
etc.) into a new file CONTRIBUTED-BY to retain record of these
contributions.  These contributors are also mentioned in
manual/contrib.texi, so we just maintain this additional record as a
courtesy to the earlier developers.

The following scripts were used to filter a list of files to edit in
place and to clean up the CONTRIBUTED-BY file respectively.  These
were not added to the glibc sources because they're not expected to be
of any use in future given that this is a one time task:

https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc
https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-09-03 22:06:44 +05:30

87 lines
1.3 KiB
ArmAsm

/*
* Public domain.
*/
#include <machine/asm.h>
#include <libm-alias-finite.h>
.section .rodata
.align ALIGNARG(4)
.type zero_nan,@object
zero_nan:
.double 0.0
nan: .byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f
.byte 0, 0, 0, 0, 0, 0, 0, 0x80
.byte 0, 0, 0, 0, 0, 0, 0xff, 0x7f
ASM_SIZE_DIRECTIVE(zero_nan)
#ifdef PIC
# define MO(op) op##@GOTOFF(%ecx)
# define MOX(op,x,f) op##@GOTOFF(%ecx,x,f)
#else
# define MO(op) op
# define MOX(op,x,f) op(,x,f)
#endif
.text
ENTRY(__ieee754_scalbl)
fldt 16(%esp)
fxam
fnstsw
fldt 4(%esp)
andl $0x4700, %eax
cmpl $0x0700, %eax
je 1f
andl $0x4500, %eax
cmpl $0x0100, %eax
je 2f
fxam
fnstsw
andl $0x4500, %eax
cmpl $0x0100, %eax
je 2f
fld %st(1)
frndint
fcomp %st(2)
fnstsw
sahf
jne 4f
fscale
fstp %st(1)
ret
/* y is -inf */
1: fxam
#ifdef PIC
LOAD_PIC_REG (cx)
#endif
fnstsw
movl 12(%esp), %edx
shrl $5, %eax
fstp %st
fstp %st
andl $0x8000, %edx
andl $0x0228, %eax
cmpl $0x0028, %eax
je 4f
andl $8, %eax
shrl $11, %edx
addl %edx, %eax
fldl MOX(zero_nan, %eax, 1)
ret
/* The result is NaN; raise an exception for sNaN arguments. */
2: faddp
ret
/* Return NaN and raise the invalid exception. */
4: fstp %st
fstp %st
fldz
fdiv %st
ret
END(__ieee754_scalbl)
libm_alias_finite (__ieee754_scalbl, __scalbl)