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|
/* Copyright (C) 2004-2013 Free Software Foundation, Inc.
This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* libgcc routines for the STMicroelectronics ST40-300 CPU.
Contributed by J"orn Rennecke joern.rennecke@st.com. */
#include "lib1funcs.h"
#if !__SHMEDIA__
#ifdef L_div_table
#if defined (__SH3__) || defined (__SH3E__) || defined (__SH4__) || defined (__SH4_SINGLE__) || defined (__SH4_SINGLE_ONLY__) || defined (__SH4_NOFPU__)
/* This code used shld, thus is not suitable for SH1 / SH2. */
/* Signed / unsigned division without use of FPU, optimized for SH4-300.
Uses a lookup table for divisors in the range -128 .. +127, and
div1 with case distinction for larger divisors in three more ranges.
The code is lumped together with the table to allow the use of mova. */
#ifdef __LITTLE_ENDIAN__
#define L_LSB 0
#define L_LSWMSB 1
#define L_MSWLSB 2
#else
#define L_LSB 3
#define L_LSWMSB 2
#define L_MSWLSB 1
#endif
.global GLOBAL(udivsi3_i4i)
.global GLOBAL(sdivsi3_i4i)
FUNC(GLOBAL(udivsi3_i4i))
FUNC(GLOBAL(sdivsi3_i4i))
.balign 4
LOCAL(div_ge8m): ! 10 cycles up to here
rotcr r1 ! signed shift must use original sign from r4
div0s r5,r4
mov #24,r7
shld r7,r6
shad r0,r1
rotcl r6
div1 r5,r1
swap.w r5,r0 ! detect -0x80000000 : 0x800000
rotcl r6
swap.w r4,r7
div1 r5,r1
swap.b r7,r7
rotcl r6
or r7,r0
div1 r5,r1
swap.w r0,r7
rotcl r6
or r7,r0
div1 r5,r1
add #-0x80,r0
rotcl r6
extu.w r0,r0
div1 r5,r1
neg r0,r0
rotcl r6
swap.w r0,r0
div1 r5,r1
mov.l @r15+,r7
and r6,r0
rotcl r6
div1 r5,r1
shll2 r0
rotcl r6
exts.b r0,r0
div1 r5,r1
swap.w r0,r0
exts.w r0,r1
exts.b r6,r0
mov.l @r15+,r6
rotcl r0
rts
sub r1,r0
! 31 cycles up to here
.balign 4
LOCAL(udiv_ge64k): ! 3 cycles up to here
mov r4,r0
shlr8 r0
div0u
cmp/hi r0,r5
bt LOCAL(udiv_r8)
mov.l r5,@-r15
shll8 r5
! 7 cycles up to here
.rept 8
div1 r5,r0
.endr
extu.b r4,r1 ! 15 cycles up to here
extu.b r0,r6
xor r1,r0
xor r6,r0
swap.b r6,r6
.rept 8
div1 r5,r0
.endr ! 25 cycles up to here
extu.b r0,r0
mov.l @r15+,r5
or r6,r0
mov.l @r15+,r6
rts
rotcl r0 ! 28 cycles up to here
.balign 4
LOCAL(udiv_r8): ! 6 cycles up to here
mov.l r4,@-r15
shll16 r4
shll8 r4
!
shll r4
mov r0,r1
div1 r5,r1
mov r4,r0
rotcl r0
mov.l @r15+,r4
div1 r5,r1
! 12 cycles up to here
.rept 6
rotcl r0; div1 r5,r1
.endr
mov.l @r15+,r6 ! 24 cycles up to here
rts
rotcl r0
.balign 4
LOCAL(div_ge32k): ! 6 cycles up to here
mov.l r7,@-r15
swap.w r5,r6
exts.b r6,r7
exts.w r6,r6
cmp/eq r6,r7
extu.b r1,r6
bf/s LOCAL(div_ge8m)
cmp/hi r1,r4 ! copy sign bit of r4 into T
rotcr r1 ! signed shift must use original sign from r4
div0s r5,r4
shad r0,r1
shll8 r5
div1 r5,r1
mov r5,r7 ! detect r4 == 0x80000000 && r5 == 0x8000(00)
div1 r5,r1
shlr8 r7
div1 r5,r1
swap.w r4,r0
div1 r5,r1
swap.b r0,r0
div1 r5,r1
or r0,r7
div1 r5,r1
add #-80,r7
div1 r5,r1
swap.w r7,r0
div1 r5,r1
or r0,r7
extu.b r1,r0
xor r6,r1
xor r0,r1
exts.b r0,r0
div1 r5,r1
extu.w r7,r7
div1 r5,r1
neg r7,r7 ! upper 16 bit of r7 == 0 if r4 == 0x80000000 && r5 == 0x8000
div1 r5,r1
and r0,r7
div1 r5,r1
swap.w r7,r7 ! 26 cycles up to here.
div1 r5,r1
shll8 r0
div1 r5,r1
exts.w r7,r7
div1 r5,r1
add r0,r0
div1 r5,r1
sub r7,r0
extu.b r1,r1
mov.l @r15+,r7
rotcl r1
mov.l @r15+,r6
add r1,r0
mov #-8,r1
rts
shad r1,r5 ! 34 cycles up to here
.balign 4
GLOBAL(udivsi3_i4i):
mov.l r6,@-r15
extu.w r5,r6
cmp/eq r5,r6
mov #0x7f,r0
bf LOCAL(udiv_ge64k)
cmp/hi r0,r5
bf LOCAL(udiv_le128)
mov r4,r1
shlr8 r1
div0u
shlr r1
shll16 r6
div1 r6,r1
extu.b r4,r0 ! 7 cycles up to here
.rept 8
div1 r6,r1
.endr ! 15 cycles up to here
xor r1,r0 ! xor dividend with result lsb
.rept 6
div1 r6,r1
.endr
mov.l r7,@-r15 ! 21 cycles up to here
div1 r6,r1
extu.b r0,r7
div1 r6,r1
shll8 r7
extu.w r1,r0
xor r7,r1 ! replace lsb of result with lsb of dividend
div1 r6,r1
mov #0,r7
div1 r6,r1
!
div1 r6,r1
bra LOCAL(div_end)
div1 r6,r1 ! 28 cycles up to here
/* This is link-compatible with a GLOBAL(sdivsi3) call,
but we effectively clobber only r1, macl and mach */
/* Because negative quotients are calculated as one's complements,
-0x80000000 divided by the smallest positive number of a number
range (0x80, 0x8000, 0x800000) causes saturation in the one's
complement representation, and we have to suppress the
one's -> two's complement adjustment. Since positive numbers
don't get such an adjustment, it's OK to also compute one's -> two's
complement adjustment suppression for a dividend of 0. */
.balign 4
GLOBAL(sdivsi3_i4i):
mov.l r6,@-r15
exts.b r5,r6
cmp/eq r5,r6
mov #-1,r1
bt/s LOCAL(div_le128)
cmp/pz r4
addc r4,r1
exts.w r5,r6
cmp/eq r5,r6
mov #-7,r0
bf/s LOCAL(div_ge32k)
cmp/hi r1,r4 ! copy sign bit of r4 into T
rotcr r1
shll16 r6 ! 7 cycles up to here
shad r0,r1
div0s r5,r4
div1 r6,r1
mov.l r7,@-r15
div1 r6,r1
mov r4,r0 ! re-compute adjusted dividend
div1 r6,r1
mov #-31,r7
div1 r6,r1
shad r7,r0
div1 r6,r1
add r4,r0 ! adjusted dividend
div1 r6,r1
mov.l r8,@-r15
div1 r6,r1
swap.w r4,r8 ! detect special case r4 = 0x80000000, r5 = 0x80
div1 r6,r1
swap.b r8,r8
xor r1,r0 ! xor dividend with result lsb
div1 r6,r1
div1 r6,r1
or r5,r8
div1 r6,r1
add #-0x80,r8 ! r8 is 0 iff there is a match
div1 r6,r1
swap.w r8,r7 ! or upper 16 bits...
div1 r6,r1
or r7,r8 !...into lower 16 bits
div1 r6,r1
extu.w r8,r8
div1 r6,r1
extu.b r0,r7
div1 r6,r1
shll8 r7
exts.w r1,r0
xor r7,r1 ! replace lsb of result with lsb of dividend
div1 r6,r1
neg r8,r8 ! upper 16 bits of r8 are now 0xffff iff we want end adjm.
div1 r6,r1
and r0,r8
div1 r6,r1
swap.w r8,r7
div1 r6,r1
mov.l @r15+,r8 ! 58 insns, 29 cycles up to here
LOCAL(div_end):
div1 r6,r1
shll8 r0
div1 r6,r1
exts.w r7,r7
div1 r6,r1
add r0,r0
div1 r6,r1
sub r7,r0
extu.b r1,r1
mov.l @r15+,r7
rotcl r1
mov.l @r15+,r6
rts
add r1,r0
.balign 4
LOCAL(udiv_le128): ! 4 cycles up to here (or 7 for mispredict)
mova LOCAL(div_table_inv),r0
shll2 r6
mov.l @(r0,r6),r1
mova LOCAL(div_table_clz),r0
lds r4,mach
!
!
!
tst r1,r1
!
bt 0f
dmulu.l r1,r4
0: mov.b @(r0,r5),r1
clrt
!
!
sts mach,r0
addc r4,r0
rotcr r0
mov.l @r15+,r6
rts
shld r1,r0
.balign 4
LOCAL(div_le128): ! 3 cycles up to here (or 6 for mispredict)
mova LOCAL(div_table_inv),r0
shll2 r6
mov.l @(r0,r6),r1
mova LOCAL(div_table_clz),r0
neg r4,r6
bf 0f
mov r4,r6
0: lds r6,mach
tst r1,r1
bt 0f
dmulu.l r1,r6
0: div0s r4,r5
mov.b @(r0,r5),r1
bt/s LOCAL(le128_neg)
clrt
!
sts mach,r0
addc r6,r0
rotcr r0
mov.l @r15+,r6
rts
shld r1,r0
/* Could trap divide by zero for the cost of one cycle more mispredict penalty:
...
dmulu.l r1,r6
0: div0s r4,r5
bt/s LOCAL(le128_neg)
tst r5,r5
bt LOCAL(div_by_zero)
mov.b @(r0,r5),r1
sts mach,r0
addc r6,r0
...
LOCAL(div_by_zero):
trapa #
.balign 4
LOCAL(le128_neg):
bt LOCAL(div_by_zero)
mov.b @(r0,r5),r1
sts mach,r0
addc r6,r0
... */
.balign 4
LOCAL(le128_neg):
sts mach,r0
addc r6,r0
rotcr r0
mov.l @r15+,r6
shad r1,r0
rts
neg r0,r0
ENDFUNC(GLOBAL(udivsi3_i4i))
ENDFUNC(GLOBAL(sdivsi3_i4i))
/* This table has been generated by divtab-sh4.c. */
.balign 4
.byte -7
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -3
.byte -3
.byte -3
.byte -3
.byte -3
.byte -3
.byte -3
.byte -3
.byte -2
.byte -2
.byte -2
.byte -2
.byte -1
.byte -1
.byte 0
LOCAL(div_table_clz):
.byte 0
.byte 0
.byte -1
.byte -1
.byte -2
.byte -2
.byte -2
.byte -2
.byte -3
.byte -3
.byte -3
.byte -3
.byte -3
.byte -3
.byte -3
.byte -3
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -4
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -5
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
.byte -6
/* 1/-128 .. 1/127, normalized. There is an implicit leading 1 in bit 32,
or in bit 33 for powers of two. */
.balign 4
.long 0x0
.long 0x2040811
.long 0x4104105
.long 0x624DD30
.long 0x8421085
.long 0xA6810A7
.long 0xC9714FC
.long 0xECF56BF
.long 0x11111112
.long 0x135C8114
.long 0x15B1E5F8
.long 0x18118119
.long 0x1A7B9612
.long 0x1CF06ADB
.long 0x1F7047DD
.long 0x21FB7813
.long 0x24924925
.long 0x27350B89
.long 0x29E4129F
.long 0x2C9FB4D9
.long 0x2F684BDB
.long 0x323E34A3
.long 0x3521CFB3
.long 0x38138139
.long 0x3B13B13C
.long 0x3E22CBCF
.long 0x41414142
.long 0x446F8657
.long 0x47AE147B
.long 0x4AFD6A06
.long 0x4E5E0A73
.long 0x51D07EAF
.long 0x55555556
.long 0x58ED2309
.long 0x5C9882BA
.long 0x60581606
.long 0x642C8591
.long 0x68168169
.long 0x6C16C16D
.long 0x702E05C1
.long 0x745D1746
.long 0x78A4C818
.long 0x7D05F418
.long 0x81818182
.long 0x86186187
.long 0x8ACB90F7
.long 0x8F9C18FA
.long 0x948B0FCE
.long 0x9999999A
.long 0x9EC8E952
.long 0xA41A41A5
.long 0xA98EF607
.long 0xAF286BCB
.long 0xB4E81B4F
.long 0xBACF914D
.long 0xC0E07039
.long 0xC71C71C8
.long 0xCD856891
.long 0xD41D41D5
.long 0xDAE6076C
.long 0xE1E1E1E2
.long 0xE9131AC0
.long 0xF07C1F08
.long 0xF81F81F9
.long 0x0
.long 0x4104105
.long 0x8421085
.long 0xC9714FC
.long 0x11111112
.long 0x15B1E5F8
.long 0x1A7B9612
.long 0x1F7047DD
.long 0x24924925
.long 0x29E4129F
.long 0x2F684BDB
.long 0x3521CFB3
.long 0x3B13B13C
.long 0x41414142
.long 0x47AE147B
.long 0x4E5E0A73
.long 0x55555556
.long 0x5C9882BA
.long 0x642C8591
.long 0x6C16C16D
.long 0x745D1746
.long 0x7D05F418
.long 0x86186187
.long 0x8F9C18FA
.long 0x9999999A
.long 0xA41A41A5
.long 0xAF286BCB
.long 0xBACF914D
.long 0xC71C71C8
.long 0xD41D41D5
.long 0xE1E1E1E2
.long 0xF07C1F08
.long 0x0
.long 0x8421085
.long 0x11111112
.long 0x1A7B9612
.long 0x24924925
.long 0x2F684BDB
.long 0x3B13B13C
.long 0x47AE147B
.long 0x55555556
.long 0x642C8591
.long 0x745D1746
.long 0x86186187
.long 0x9999999A
.long 0xAF286BCB
.long 0xC71C71C8
.long 0xE1E1E1E2
.long 0x0
.long 0x11111112
.long 0x24924925
.long 0x3B13B13C
.long 0x55555556
.long 0x745D1746
.long 0x9999999A
.long 0xC71C71C8
.long 0x0
.long 0x24924925
.long 0x55555556
.long 0x9999999A
.long 0x0
.long 0x55555556
.long 0x0
.long 0x0
LOCAL(div_table_inv):
.long 0x0
.long 0x0
.long 0x0
.long 0x55555556
.long 0x0
.long 0x9999999A
.long 0x55555556
.long 0x24924925
.long 0x0
.long 0xC71C71C8
.long 0x9999999A
.long 0x745D1746
.long 0x55555556
.long 0x3B13B13C
.long 0x24924925
.long 0x11111112
.long 0x0
.long 0xE1E1E1E2
.long 0xC71C71C8
.long 0xAF286BCB
.long 0x9999999A
.long 0x86186187
.long 0x745D1746
.long 0x642C8591
.long 0x55555556
.long 0x47AE147B
.long 0x3B13B13C
.long 0x2F684BDB
.long 0x24924925
.long 0x1A7B9612
.long 0x11111112
.long 0x8421085
.long 0x0
.long 0xF07C1F08
.long 0xE1E1E1E2
.long 0xD41D41D5
.long 0xC71C71C8
.long 0xBACF914D
.long 0xAF286BCB
.long 0xA41A41A5
.long 0x9999999A
.long 0x8F9C18FA
.long 0x86186187
.long 0x7D05F418
.long 0x745D1746
.long 0x6C16C16D
.long 0x642C8591
.long 0x5C9882BA
.long 0x55555556
.long 0x4E5E0A73
.long 0x47AE147B
.long 0x41414142
.long 0x3B13B13C
.long 0x3521CFB3
.long 0x2F684BDB
.long 0x29E4129F
.long 0x24924925
.long 0x1F7047DD
.long 0x1A7B9612
.long 0x15B1E5F8
.long 0x11111112
.long 0xC9714FC
.long 0x8421085
.long 0x4104105
.long 0x0
.long 0xF81F81F9
.long 0xF07C1F08
.long 0xE9131AC0
.long 0xE1E1E1E2
.long 0xDAE6076C
.long 0xD41D41D5
.long 0xCD856891
.long 0xC71C71C8
.long 0xC0E07039
.long 0xBACF914D
.long 0xB4E81B4F
.long 0xAF286BCB
.long 0xA98EF607
.long 0xA41A41A5
.long 0x9EC8E952
.long 0x9999999A
.long 0x948B0FCE
.long 0x8F9C18FA
.long 0x8ACB90F7
.long 0x86186187
.long 0x81818182
.long 0x7D05F418
.long 0x78A4C818
.long 0x745D1746
.long 0x702E05C1
.long 0x6C16C16D
.long 0x68168169
.long 0x642C8591
.long 0x60581606
.long 0x5C9882BA
.long 0x58ED2309
.long 0x55555556
.long 0x51D07EAF
.long 0x4E5E0A73
.long 0x4AFD6A06
.long 0x47AE147B
.long 0x446F8657
.long 0x41414142
.long 0x3E22CBCF
.long 0x3B13B13C
.long 0x38138139
.long 0x3521CFB3
.long 0x323E34A3
.long 0x2F684BDB
.long 0x2C9FB4D9
.long 0x29E4129F
.long 0x27350B89
.long 0x24924925
.long 0x21FB7813
.long 0x1F7047DD
.long 0x1CF06ADB
.long 0x1A7B9612
.long 0x18118119
.long 0x15B1E5F8
.long 0x135C8114
.long 0x11111112
.long 0xECF56BF
.long 0xC9714FC
.long 0xA6810A7
.long 0x8421085
.long 0x624DD30
.long 0x4104105
.long 0x2040811
/* maximum error: 0.987342 scaled: 0.921875*/
#endif /* SH3 / SH4 */
#endif /* L_div_table */
#endif /* !__SHMEDIA__ */
|
