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gcc/libgcc/config/rl78/divmodsi.S

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/* SImode div/mod functions for the GCC support library for the Renesas RL78 processors.
Copyright (C) 2012-2016 Free Software Foundation, Inc.
Contributed by Red Hat.
This file is part of GCC.
GCC 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.
GCC 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/>. */
#include "vregs.h"
#if defined __RL78_MUL_G14__
START_FUNC ___divsi3
;; r8,r10 = 4[sp],6[sp] / 8[sp],10[sp]
;; Load and test for a negative denumerator.
movw ax, [sp+8]
movw de, ax
movw ax, [sp+10]
mov1 cy, a.7
movw hl, ax
bc $__div_neg_den
;; Load and test for a negative numerator.
movw ax, [sp+6]
mov1 cy, a.7
movw bc, ax
movw ax, [sp+4]
bc $__div_neg_num
;; Neither are negative - we can use the unsigned divide instruction.
__div_no_convert:
push psw
di
divwu
pop psw
movw r8, ax
movw ax, bc
movw r10, ax
ret
__div_neg_den:
;; Negate the denumerator (which is in HLDE)
clrw ax
subw ax, de
movw de, ax
clrw ax
sknc
decw ax
subw ax, hl
movw hl, ax
;; Load and test for a negative numerator.
movw ax, [sp+6]
mov1 cy, a.7
movw bc, ax
movw ax, [sp+4]
;; If it is not negative then we perform the division and then negate the result.
bnc $__div_then_convert
;; Otherwise we negate the numerator and then go with a straightforward unsigned division.
;; The negation is complicated because AX, BC, DE and HL are already in use.
;; ax: numL bc: numH r8: r10:
xchw ax, bc
;; ax: numH bc: numL r8: r10:
movw r8, ax
;; ax: bc: numL r8: numH r10:
clrw ax
;; ax: 0 bc: numL r8: numH r10:
subw ax, bc
;; ax: -numL bc: r8: numH r10:
movw r10, ax
;; ax: bc: r8: numH r10: -numL
movw ax, r8
;; ax: numH bc: r8: r10: -numL
movw bc, ax
;; ax: bc: numH r8: r10: -numL
clrw ax
;; ax: 0 bc: numH r8: r10: -numL
sknc
decw ax
;; ax: -1 bc: numH r8: r10: -numL
subw ax, bc
;; ax: -numH bc: r8: r10: -numL
movw bc, ax
;; ax: bc: -numH r8: r10: -numL
movw ax, r10
;; ax: -numL bc: -numH r8: r10:
br $!__div_no_convert
__div_neg_num:
;; Negate the numerator (which is in BCAX)
;; We know that the denumerator is positive.
;; Note - we temporarily overwrite DE. We know that we can safely load it again off the stack again.
movw de, ax
clrw ax
subw ax, de
movw de, ax
clrw ax
sknc
decw ax
subw ax, bc
movw bc, ax
movw ax, [sp+8]
xchw ax, de
__div_then_convert:
push psw
di
divwu
pop psw
;; Negate result (in BCAX) and transfer into r8,r10
movw de, ax
clrw ax
subw ax, de
movw r8, ax
clrw ax
sknc
decw ax
subw ax, bc
movw r10, ax
ret
END_FUNC ___divsi3
;----------------------------------------------------------------------
START_FUNC ___udivsi3
;; r8,r10 = 4[sp],6[sp] / 8[sp],10[sp]
;; Used when compiling with -Os specified.
movw ax, [sp+10]
movw hl, ax
movw ax, [sp+8]
movw de, ax
movw ax, [sp+6]
movw bc, ax
movw ax, [sp+4]
push psw ; Save the current interrupt status
di ; Disable interrupts. See Renesas Technical update TN-RL*-A025B/E
divwu ; bcax = bcax / hlde
pop psw ; Restore saved interrupt status
movw r8, ax
movw ax, bc
movw r10, ax
ret
END_FUNC ___udivsi3
;----------------------------------------------------------------------
START_FUNC ___modsi3
;; r8,r10 = 4[sp],6[sp] % 8[sp],10[sp]
;; Load and test for a negative denumerator.
movw ax, [sp+8]
movw de, ax
movw ax, [sp+10]
mov1 cy, a.7
movw hl, ax
bc $__mod_neg_den
;; Load and test for a negative numerator.
movw ax, [sp+6]
mov1 cy, a.7
movw bc, ax
movw ax, [sp+4]
bc $__mod_neg_num
;; Neither are negative - we can use the unsigned divide instruction.
__mod_no_convert:
push psw
di
divwu
pop psw
movw ax, de
movw r8, ax
movw ax, hl
movw r10, ax
ret
__mod_neg_den:
;; Negate the denumerator (which is in HLDE)
clrw ax
subw ax, de
movw de, ax
clrw ax
sknc
decw ax
subw ax, hl
movw hl, ax
;; Load and test for a negative numerator.
movw ax, [sp+6]
mov1 cy, a.7
movw bc, ax
movw ax, [sp+4]
;; If it is not negative then we perform the modulo operation without conversion
bnc $__mod_no_convert
;; Otherwise we negate the numerator and then go with a modulo followed by negation.
;; The negation is complicated because AX, BC, DE and HL are already in use.
xchw ax, bc
movw r8, ax
clrw ax
subw ax, bc
movw r10, ax
movw ax, r8
movw bc, ax
clrw ax
sknc
decw ax
subw ax, bc
movw bc, ax
movw ax, r10
br $!__mod_then_convert
__mod_neg_num:
;; Negate the numerator (which is in BCAX)
;; We know that the denumerator is positive.
;; Note - we temporarily overwrite DE. We know that we can safely load it again off the stack again.
movw de, ax
clrw ax
subw ax, de
movw de, ax
clrw ax
sknc
decw ax
subw ax, bc
movw bc, ax
movw ax, [sp+8]
xchw ax, de
__mod_then_convert:
push psw
di
divwu
pop psw
;; Negate result (in HLDE) and transfer into r8,r10
clrw ax
subw ax, de
movw r8, ax
clrw ax
sknc
decw ax
subw ax, hl
movw r10, ax
ret
END_FUNC ___modsi3
;----------------------------------------------------------------------
START_FUNC ___umodsi3
;; r8,r10 = 4[sp],6[sp] % 8[sp],10[sp]
;; Used when compiling with -Os specified.
movw ax, [sp+10]
movw hl, ax
movw ax, [sp+8]
movw de, ax
movw ax, [sp+6]
movw bc, ax
movw ax, [sp+4]
push psw ; Save the current interrupt status
di ; Disable interrupts. See Renesas Technical update TN-RL*-A025B/E
divwu ; hlde = bcax %% hlde
pop psw ; Restore saved interrupt status
movw ax, de
movw r8, ax
movw ax, hl
movw r10, ax
ret
END_FUNC ___umodsi3
;----------------------------------------------------------------------
#elif defined __RL78_MUL_G13__
;----------------------------------------------------------------------
;; Hardware registers. Note - these values match the silicon, not the documentation.
MDAL = 0xffff0
MDAH = 0xffff2
MDBL = 0xffff6
MDBH = 0xffff4
MDCL = 0xf00e0
MDCH = 0xf00e2
MDUC = 0xf00e8
.macro _Negate low, high
movw ax, \low
movw bc, ax
clrw ax
subw ax, bc
movw \low, ax
movw ax, \high
movw bc, ax
clrw ax
sknc
decw ax
subw ax, bc
movw \high, ax
.endm
;----------------------------------------------------------------------
START_FUNC ___divsi3
;; r8,r10 = 4[sp],6[sp] / 8[sp],10[sp]
mov a, #0xC0 ; Set DIVMODE=1 and MACMODE=1
mov !MDUC, a ; This preps the peripheral for division without interrupt generation
;; Load and test for a negative denumerator.
movw ax, [sp+8]
movw MDBL, ax
movw ax, [sp+10]
mov1 cy, a.7
movw MDBH, ax
bc $__div_neg_den
;; Load and test for a negative numerator.
movw ax, [sp+6]
mov1 cy, a.7
movw MDAH, ax
movw ax, [sp+4]
movw MDAL, ax
bc $__div_neg_num
;; Neither are negative - we can use the unsigned divide hardware.
__div_no_convert:
mov a, #0xC1 ; Set the DIVST bit in MDUC
mov !MDUC, a ; This starts the division op
1: mov a, !MDUC ; Wait 16 clocks or until DIVST is clear
bt a.0, $1b
movw ax, MDAL ; Read the result
movw r8, ax
movw ax, MDAH
movw r10, ax
ret
__div_neg_den:
;; Negate the denumerator (which is in MDBL/MDBH)
_Negate MDBL MDBH
;; Load and test for a negative numerator.
movw ax, [sp+6]
mov1 cy, a.7
movw MDAH, ax
movw ax, [sp+4]
movw MDAL, ax
;; If it is not negative then we perform the division and then negate the result.
bnc $__div_then_convert
;; Otherwise we negate the numerator and then go with a straightforward unsigned division.
_Negate MDAL MDAH
br $!__div_no_convert
__div_neg_num:
;; Negate the numerator (which is in MDAL/MDAH)
;; We know that the denumerator is positive.
_Negate MDAL MDAH
__div_then_convert:
mov a, #0xC1 ; Set the DIVST bit in MDUC
mov !MDUC, a ; This starts the division op
1: mov a, !MDUC ; Wait 16 clocks or until DIVST is clear
bt a.0, $1b
;; Negate result and transfer into r8,r10
_Negate MDAL MDAH ; FIXME: This could be coded more efficiently.
movw r10, ax
movw ax, MDAL
movw r8, ax
ret
END_FUNC ___divsi3
;----------------------------------------------------------------------
START_FUNC ___modsi3
;; r8,r10 = 4[sp],6[sp] % 8[sp],10[sp]
mov a, #0xC0 ; Set DIVMODE=1 and MACMODE=1
mov !MDUC, a ; This preps the peripheral for division without interrupt generation
;; Load and test for a negative denumerator.
movw ax, [sp+8]
movw MDBL, ax
movw ax, [sp+10]
mov1 cy, a.7
movw MDBH, ax
bc $__mod_neg_den
;; Load and test for a negative numerator.
movw ax, [sp+6]
mov1 cy, a.7
movw MDAH, ax
movw ax, [sp+4]
movw MDAL, ax
bc $__mod_neg_num
;; Neither are negative - we can use the unsigned divide hardware
__mod_no_convert:
mov a, #0xC1 ; Set the DIVST bit in MDUC
mov !MDUC, a ; This starts the division op
1: mov a, !MDUC ; Wait 16 clocks or until DIVST is clear
bt a.0, $1b
movw ax, !MDCL ; Read the remainder
movw r8, ax
movw ax, !MDCH
movw r10, ax
ret
__mod_neg_den:
;; Negate the denumerator (which is in MDBL/MDBH)
_Negate MDBL MDBH
;; Load and test for a negative numerator.
movw ax, [sp+6]
mov1 cy, a.7
movw MDAH, ax
movw ax, [sp+4]
movw MDAL, ax
;; If it is not negative then we perform the modulo operation without conversion
bnc $__mod_no_convert
;; Otherwise we negate the numerator and then go with a modulo followed by negation.
_Negate MDAL MDAH
br $!__mod_then_convert
__mod_neg_num:
;; Negate the numerator (which is in MDAL/MDAH)
;; We know that the denumerator is positive.
_Negate MDAL MDAH
__mod_then_convert:
mov a, #0xC1 ; Set the DIVST bit in MDUC
mov !MDUC, a ; This starts the division op
1: mov a, !MDUC ; Wait 16 clocks or until DIVST is clear
bt a.0, $1b
movw ax, !MDCL
movw bc, ax
clrw ax
subw ax, bc
movw r8, ax
movw ax, !MDCH
movw bc, ax
clrw ax
sknc
decw ax
subw ax, bc
movw r10, ax
ret
END_FUNC ___modsi3
;----------------------------------------------------------------------
START_FUNC ___udivsi3
;; r8,r10 = 4[sp],6[sp] / 8[sp],10[sp]
;; Used when compilng with -Os specified.
mov a, #0xC0 ; Set DIVMODE=1 and MACMODE=1
mov !MDUC, a ; This preps the peripheral for division without interrupt generation
movw ax, [sp+4] ; Load the divisor
movw MDAL, ax
movw ax, [sp+6]
movw MDAH, ax
movw ax, [sp+8] ; Load the dividend
movw MDBL, ax
movw ax, [sp+10]
movw MDBH, ax
mov a, #0xC1 ; Set the DIVST bit in MDUC
mov !MDUC, a ; This starts the division op
1: mov a, !MDUC ; Wait 16 clocks or until DIVST is clear
bt a.0, $1b
movw ax, !MDAL ; Read the result
movw r8, ax
movw ax, !MDAH
movw r10, ax
ret
END_FUNC ___udivsi3
;----------------------------------------------------------------------
START_FUNC ___umodsi3
;; r8,r10 = 4[sp],6[sp] % 8[sp],10[sp]
;; Used when compilng with -Os specified.
;; Note - hardware address match the silicon, not the documentation
mov a, #0xC0 ; Set DIVMODE=1 and MACMODE=1
mov !MDUC, a ; This preps the peripheral for division without interrupt generation
movw ax, [sp+4] ; Load the divisor
movw MDAL, ax
movw ax, [sp+6]
movw MDAH, ax
movw ax, [sp+8] ; Load the dividend
movw MDBL, ax
movw ax, [sp+10]
movw MDBH, ax
mov a, #0xC1 ; Set the DIVST bit in MDUC
mov !MDUC, a ; This starts the division op
1: mov a, !MDUC ; Wait 16 clocks or until DIVST is clear
bt a.0, $1b
movw ax, !MDCL ; Read the remainder
movw r8, ax
movw ax, !MDCH
movw r10, ax
ret
END_FUNC ___umodsi3
;----------------------------------------------------------------------
#elif defined __RL78_MUL_NONE__
.macro MAKE_GENERIC which,need_result
.if \need_result
quot = r8
num = r12
den = r16
bit = r20
.else
num = r8
quot = r12
den = r16
bit = r20
.endif
quotH = quot+2
quotL = quot
quotB0 = quot
quotB1 = quot+1
quotB2 = quot+2
quotB3 = quot+3
numH = num+2
numL = num
numB0 = num
numB1 = num+1
numB2 = num+2
numB3 = num+3
#define denH bc
denL = den
denB0 = den
denB1 = den+1
#define denB2 c
#define denB3 b
bitH = bit+2
bitL = bit
bitB0 = bit
bitB1 = bit+1
bitB2 = bit+2
bitB3 = bit+3
;----------------------------------------------------------------------
START_FUNC __generic_sidivmod\which
num_lt_den\which:
.if \need_result
movw r8, #0
movw r10, #0
.else
movw ax, [sp+8]
movw r8, ax
movw ax, [sp+10]
movw r10, ax
.endif
ret
shift_den_bit16\which:
movw ax, denL
movw denH, ax
movw denL, #0
.if \need_result
movw ax, bitL
movw bitH, ax
movw bitL, #0
.else
mov a, bit
add a, #16
mov bit, a
.endif
br $shift_den_bit\which
;; These routines leave DE alone - the signed functions use DE
;; to store sign information that must remain intact
.if \need_result
.global __generic_sidiv
__generic_sidiv:
.else
.global __generic_simod
__generic_simod:
.endif
;; (quot,rem) = 8[sp] /% 12[sp]
movw hl, sp
movw ax, [hl+14] ; denH
cmpw ax, [hl+10] ; numH
movw ax, [hl+12] ; denL
sknz
cmpw ax, [hl+8] ; numL
bh $num_lt_den\which
#ifdef __RL78_G10__
movw ax, denL
push ax
movw ax, bitL
push ax
movw ax, bitH
push ax
#else
sel rb2
push ax ; denL
; push bc ; denH
push de ; bitL
push hl ; bitH - stored in BC
sel rb0
#endif
;; (quot,rem) = 16[sp] /% 20[sp]
;; copy numerator
movw ax, [hl+8]
movw numL, ax
movw ax, [hl+10]
movw numH, ax
;; copy denomonator
movw ax, [hl+12]
movw denL, ax
movw ax, [hl+14]
movw denH, ax
movw ax, denL
or a, denB2
or a, denB3 ; not x
cmpw ax, #0
bnz $den_not_zero\which
.if \need_result
movw quotL, #0
movw quotH, #0
.else
movw numL, #0
movw numH, #0
.endif
br $!main_loop_done_himode\which
den_not_zero\which:
.if \need_result
;; zero out quot
movw quotL, #0
movw quotH, #0
.endif
;; initialize bit to 1
movw bitL, #1
movw bitH, #0
; while (den < num && !(den & (1L << BITS_MINUS_1)))
.if 1
;; see if we can short-circuit a bunch of shifts
movw ax, denH
cmpw ax, #0
bnz $shift_den_bit\which
movw ax, denL
cmpw ax, numH
bnh $shift_den_bit16\which
.endif
shift_den_bit\which:
movw ax, denH
mov1 cy,a.7
bc $enter_main_loop\which
cmpw ax, numH
movw ax, denL ; we re-use this below
sknz
cmpw ax, numL
bh $enter_main_loop\which
;; den <<= 1
; movw ax, denL ; already has it from the cmpw above
shlw ax, 1
movw denL, ax
; movw ax, denH
rolwc denH, 1
; movw denH, ax
;; bit <<= 1
.if \need_result
movw ax, bitL
shlw ax, 1
movw bitL, ax
movw ax, bitH
rolwc ax, 1
movw bitH, ax
.else
;; if we don't need to compute the quotent, we don't need an
;; actual bit *mask*, we just need to keep track of which bit
inc bitB0
.endif
br $shift_den_bit\which
;; while (bit)
main_loop\which:
;; if (num >= den) (cmp den > num)
movw ax, numH
cmpw ax, denH
movw ax, numL
sknz
cmpw ax, denL
skz
bnh $next_loop\which
;; num -= den
; movw ax, numL ; already has it from the cmpw above
subw ax, denL
movw numL, ax
movw ax, numH
sknc
decw ax
subw ax, denH
movw numH, ax
.if \need_result
;; res |= bit
mov a, quotB0
or a, bitB0
mov quotB0, a
mov a, quotB1
or a, bitB1
mov quotB1, a
mov a, quotB2
or a, bitB2
mov quotB2, a
mov a, quotB3
or a, bitB3
mov quotB3, a
.endif
next_loop\which:
;; den >>= 1
movw ax, denH
shrw ax, 1
movw denH, ax
mov a, denB1
rorc a, 1
mov denB1, a
mov a, denB0
rorc a, 1
mov denB0, a
;; bit >>= 1
.if \need_result
movw ax, bitH
shrw ax, 1
movw bitH, ax
mov a, bitB1
rorc a, 1
mov bitB1, a
mov a, bitB0
rorc a, 1
mov bitB0, a
.else
dec bitB0
.endif
enter_main_loop\which:
.if \need_result
movw ax, bitH
cmpw ax, #0
bnz $main_loop\which
.else
cmp bitB0, #15
bh $main_loop\which
.endif
;; bit is HImode now; check others
movw ax, numH ; numerator
cmpw ax, #0
bnz $bit_high_set\which
movw ax, denH ; denominator
cmpw ax, #0
bz $switch_to_himode\which
bit_high_set\which:
.if \need_result
movw ax, bitL
cmpw ax, #0
.else
cmp0 bitB0
.endif
bnz $main_loop\which
switch_to_himode\which:
.if \need_result
movw ax, bitL
cmpw ax, #0
.else
cmp0 bitB0
.endif
bz $main_loop_done_himode\which
;; From here on in, r22, r14, and r18 are all zero
;; while (bit)
main_loop_himode\which:
;; if (num >= den) (cmp den > num)
movw ax, denL
cmpw ax, numL
bh $next_loop_himode\which
;; num -= den
movw ax, numL
subw ax, denL
movw numL, ax
movw ax, numH
sknc
decw ax
subw ax, denH
movw numH, ax
.if \need_result
;; res |= bit
mov a, quotB0
or a, bitB0
mov quotB0, a
mov a, quotB1
or a, bitB1
mov quotB1, a
.endif
next_loop_himode\which:
;; den >>= 1
movw ax, denL
shrw ax, 1
movw denL, ax
.if \need_result
;; bit >>= 1
movw ax, bitL
shrw ax, 1
movw bitL, ax
.else
dec bitB0
.endif
.if \need_result
movw ax, bitL
cmpw ax, #0
.else
cmp0 bitB0
.endif
bnz $main_loop_himode\which
main_loop_done_himode\which:
#ifdef __RL78_G10__
pop ax
movw bitH, ax
pop ax
movw bitL, ax
pop ax
movw denL, ax
#else
sel rb2
pop hl ; bitH - stored in BC
pop de ; bitL
; pop bc ; denH
pop ax ; denL
sel rb0
#endif
ret
END_FUNC __generic_sidivmod\which
.endm
;----------------------------------------------------------------------
MAKE_GENERIC _d 1
MAKE_GENERIC _m 0
;----------------------------------------------------------------------
START_FUNC ___udivsi3
;; r8 = 4[sp] / 8[sp]
call $!__generic_sidiv
ret
END_FUNC ___udivsi3
START_FUNC ___umodsi3
;; r8 = 4[sp] % 8[sp]
call $!__generic_simod
ret
END_FUNC ___umodsi3
;----------------------------------------------------------------------
.macro NEG_AX
movw hl, ax
movw ax, #0
subw ax, [hl]
movw [hl], ax
movw ax, #0
sknc
decw ax
subw ax, [hl+2]
movw [hl+2], ax
.endm
;----------------------------------------------------------------------
START_FUNC ___divsi3
;; r8 = 4[sp] / 8[sp]
movw de, #0
mov a, [sp+7]
mov1 cy, a.7
bc $div_signed_num
mov a, [sp+11]
mov1 cy, a.7
bc $div_signed_den
call $!__generic_sidiv
ret
div_signed_num:
;; neg [sp+4]
movw ax, sp
addw ax, #4
NEG_AX
mov d, #1
mov a, [sp+11]
mov1 cy, a.7
bnc $div_unsigned_den
div_signed_den:
;; neg [sp+8]
movw ax, sp
addw ax, #8
NEG_AX
mov e, #1
div_unsigned_den:
call $!__generic_sidiv
mov a, d
cmp0 a
bz $div_skip_restore_num
;; We have to restore the numerator [sp+4]
movw ax, sp
addw ax, #4
NEG_AX
mov a, d
div_skip_restore_num:
xor a, e
bz $div_no_neg
movw ax, #r8
NEG_AX
div_no_neg:
mov a, e
cmp0 a
bz $div_skip_restore_den
;; We have to restore the denominator [sp+8]
movw ax, sp
addw ax, #8
NEG_AX
div_skip_restore_den:
ret
END_FUNC ___divsi3
START_FUNC ___modsi3
;; r8 = 4[sp] % 8[sp]
movw de, #0
mov a, [sp+7]
mov1 cy, a.7
bc $mod_signed_num
mov a, [sp+11]
mov1 cy, a.7
bc $mod_signed_den
call $!__generic_simod
ret
mod_signed_num:
;; neg [sp+4]
movw ax, sp
addw ax, #4
NEG_AX
mov d, #1
mov a, [sp+11]
mov1 cy, a.7
bnc $mod_unsigned_den
mod_signed_den:
;; neg [sp+8]
movw ax, sp
addw ax, #8
NEG_AX
mov e, #1
mod_unsigned_den:
call $!__generic_simod
mov a, d
cmp0 a
bz $mod_no_neg
movw ax, #r8
NEG_AX
;; We have to restore [sp+4] as well.
movw ax, sp
addw ax, #4
NEG_AX
mod_no_neg:
.if 1
mov a, e
cmp0 a
bz $mod_skip_restore_den
movw ax, sp
addw ax, #8
NEG_AX
mod_skip_restore_den:
.endif
ret
END_FUNC ___modsi3
;----------------------------------------------------------------------
#else
#error "Unknown RL78 hardware multiply/divide support"
#endif
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