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- /* SImode div/mod functions for the GCC support library for the Renesas RL78 processors.
- Copyright (C) 2012-2022 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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