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- ; Copyright (C) 2017-2022 Free Software Foundation, Inc.
- ; Contributed by Sebastian Perta.
- ;
- ; 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/>.
- #include "vregs.h"
- .text
- START_FUNC ___subdi3
- movw hl, sp ; use HL-based addressing (allows for direct subw)
- movw ax, [hl+4]
- subw ax, [hl+12]
- movw r8, ax
- mov a, [hl+6] ; middle bytes of the result are determined using 8-bit
- subc a, [hl+14] ; SUBC insns which both account for and update the carry bit
- mov r10, a ; (no SUBWC instruction is available)
- mov a, [hl+7]
- subc a, [hl+15]
- mov r11, a
- mov a, [hl+8]
- subc a, [hl+16]
- mov r12, a
- mov a, [hl+9]
- subc a, [hl+17]
- mov r13, a
- movw ax, [hl+10]
- sknc ; account for the possible carry from the
- decw ax ; latest 8-bit operation
- subw ax, [hl+18]
- movw r14, ax
- ret
- END_FUNC ___subdi3
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