From 100c470727ae015eb4d6d57dd4b1cc21c736d520 Mon Sep 17 00:00:00 2001 From: uz Date: Tue, 3 Nov 2009 17:43:57 +0000 Subject: [PATCH] Added C callable entry point for the 16x16=32 multiplication. git-svn-id: svn://svn.cc65.org/cc65/trunk@4435 b7a2c559-68d2-44c3-8de9-860c34a00d81 --- include/cc65.h | 7 +++++-- libsrc/runtime/mul16x16r32.s | 13 ++++++++++--- 2 files changed, 15 insertions(+), 5 deletions(-) diff --git a/include/cc65.h b/include/cc65.h index 8a5550803..47d21cea9 100644 --- a/include/cc65.h +++ b/include/cc65.h @@ -44,12 +44,15 @@ -extern int __fastcall__ cc65_sin (unsigned x); +unsigned long __fastcall__ cc65_umul16x16r32 (unsigned rhs, unsigned lhs); +/* Multiplicate two unsigned 16 bit to yield an unsigned 32 bit result */ + +int __fastcall__ cc65_sin (unsigned x); /* Return the sine of the argument, which must be in range 0..360. The result * is in 8.8 fixed point format, which means that 1.0 = $100 and -1.0 = $FF00. */ -extern int __fastcall__ cc65_cos (unsigned x); +int __fastcall__ cc65_cos (unsigned x); /* Return the cosine of the argument, which must be in range 0..360. The result * is in 8.8 fixed point format, which means that 1.0 = $100 and -1.0 = $FF00. */ diff --git a/libsrc/runtime/mul16x16r32.s b/libsrc/runtime/mul16x16r32.s index 968903de5..72d9fe35f 100644 --- a/libsrc/runtime/mul16x16r32.s +++ b/libsrc/runtime/mul16x16r32.s @@ -4,8 +4,9 @@ ; CC65 runtime: 16x16 => 32 multiplication ; - .export umul16x16r32 + .export umul16x16r32, _cc65_umul16x16r32 .export mul16x16r32 := umul16x16r32 + .import popax .importzp ptr1, ptr2, ptr3, ptr4, sreg @@ -14,12 +15,18 @@ ; ; lhs rhs result result also in ; ------------------------------------------------------------- -; ptr1 ptr3 ax:sreg ptr1:sreg +; ptr1 ax ax:sreg ptr1:sreg ; +_cc65_umul16x16r32: + sta ptr1 + stx ptr1+1 + jsr popax + umul16x16r32: + sta ptr3 + stx ptr3+1 lda #0 - ldx ptr3+1 ; Get high byte into register for speed sta sreg+1 ldy #16 ; Number of bits -- 2.39.5