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Make the 8x32 unsigned multiplication routine C callable.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@5079 b7a2c559-68d2-44c3-8de9-860c34a00d81
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uz
2011-07-10 14:52:35 +00:00
parent 3806cd472d
commit 655ffe5dcd
3 changed files with 34 additions and 1 deletions
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1
libsrc/common/Makefile
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@@ -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
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@@ -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