6502/cc65
1
0
Fork 0
mirror of https://github.com/cc65/cc65.git synced 2024-12-23 04:30:10 +00:00
Code Issues Projects Releases Wiki Activity

Make the 8x32 unsigned multiplication routine C callable.

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@5079 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2011-07-10 14:52:35 +00:00
parent 3806cd472d
commit 655ffe5dcd
3 changed files with 34 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/cc65.h
View File

@ -6,7 +6,7 @@
/* */
/* */
/* */
/* (C) 2009, Ullrich von Bassewitz */
/* (C) 2009-2011, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
@ -67,6 +67,11 @@ long __fastcall__ cc65_imul16x16r32 (int lhs, int rhs);
unsigned __fastcall__ cc65_umul8x8r16 (unsigned char lhs, unsigned char rhs);
/* Multiplicate two unsigned 8 bit to yield an unsigned 16 bit result */
unsigned long __fastcall__ cc65_umul16x8r32 (unsigned lhs, unsigned char rhs);
/* Multiplicate an unsigned 16 bit by an unsigned 8 bit number yielding a 24
* bit unsigned result that is extended to 32 bits for easier handling from C.
*/
unsigned long __fastcall__ cc65_umul16x16r32 (unsigned lhs, unsigned rhs);
/* Multiplicate two unsigned 16 bit to yield an unsigned 32 bit result */

1
libsrc/common/Makefile
View File

@ -105,6 +105,7 @@ S_OBJS = _cwd.o \
cc65_sincos.o \
cc65_udiv32by16r16.o \
cc65_umul16x16r32.o \
cc65_umul16x8r32.o \
chdir.o \
copydata.o \
creat.o \

27
libsrc/common/cc65_umul16x8r32.s Normal file
View File

@ -0,0 +1,27 @@
;
; Ullrich von Bassewitz, 2011-07-10
;
; CC65 library: 16x8 => 32 unsigned multiplication
;
.export _cc65_umul16x8r32
.import umul8x16r24, popax
.include "zeropage.inc"
;---------------------------------------------------------------------------
; 16x8 => 32 unsigned multiplication routine. We use 8x16 => 24 and clear
; the high byte of the result
.proc _cc65_umul16x8r32
sta ptr1
lda #0
sta sreg+1 ; Clear high byte of result
jsr popax
jmp umul8x16r24
.endproc