da957e111b
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
88 lines
2.4 KiB
ArmAsm
88 lines
2.4 KiB
ArmAsm
.file "shr_Xsig.S"
|
|
/*---------------------------------------------------------------------------+
|
|
| shr_Xsig.S |
|
|
| |
|
|
| 12 byte right shift function |
|
|
| |
|
|
| Copyright (C) 1992,1994,1995 |
|
|
| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
|
|
| Australia. E-mail billm@jacobi.maths.monash.edu.au |
|
|
| |
|
|
| Call from C as: |
|
|
| void shr_Xsig(Xsig *arg, unsigned nr) |
|
|
| |
|
|
| Extended shift right function. |
|
|
| Fastest for small shifts. |
|
|
| Shifts the 12 byte quantity pointed to by the first arg (arg) |
|
|
| right by the number of bits specified by the second arg (nr). |
|
|
| |
|
|
+---------------------------------------------------------------------------*/
|
|
|
|
#include "fpu_emu.h"
|
|
|
|
.text
|
|
ENTRY(shr_Xsig)
|
|
push %ebp
|
|
movl %esp,%ebp
|
|
pushl %esi
|
|
movl PARAM2,%ecx
|
|
movl PARAM1,%esi
|
|
cmpl $32,%ecx /* shrd only works for 0..31 bits */
|
|
jnc L_more_than_31
|
|
|
|
/* less than 32 bits */
|
|
pushl %ebx
|
|
movl (%esi),%eax /* lsl */
|
|
movl 4(%esi),%ebx /* midl */
|
|
movl 8(%esi),%edx /* msl */
|
|
shrd %cl,%ebx,%eax
|
|
shrd %cl,%edx,%ebx
|
|
shr %cl,%edx
|
|
movl %eax,(%esi)
|
|
movl %ebx,4(%esi)
|
|
movl %edx,8(%esi)
|
|
popl %ebx
|
|
popl %esi
|
|
leave
|
|
ret
|
|
|
|
L_more_than_31:
|
|
cmpl $64,%ecx
|
|
jnc L_more_than_63
|
|
|
|
subb $32,%cl
|
|
movl 4(%esi),%eax /* midl */
|
|
movl 8(%esi),%edx /* msl */
|
|
shrd %cl,%edx,%eax
|
|
shr %cl,%edx
|
|
movl %eax,(%esi)
|
|
movl %edx,4(%esi)
|
|
movl $0,8(%esi)
|
|
popl %esi
|
|
leave
|
|
ret
|
|
|
|
L_more_than_63:
|
|
cmpl $96,%ecx
|
|
jnc L_more_than_95
|
|
|
|
subb $64,%cl
|
|
movl 8(%esi),%eax /* msl */
|
|
shr %cl,%eax
|
|
xorl %edx,%edx
|
|
movl %eax,(%esi)
|
|
movl %edx,4(%esi)
|
|
movl %edx,8(%esi)
|
|
popl %esi
|
|
leave
|
|
ret
|
|
|
|
L_more_than_95:
|
|
xorl %eax,%eax
|
|
movl %eax,(%esi)
|
|
movl %eax,4(%esi)
|
|
movl %eax,8(%esi)
|
|
popl %esi
|
|
leave
|
|
ret
|