* doc/sdccman.lyx: corrected version (should be 2.5.4 not 2.5.5)

[fw/sdcc] / device / lib / _divuint.c

diff --git a/device/lib/_divuint.c b/device/lib/_divuint.c
index 2226f97cb6c1ee034038c537b81eb5e630aee1f2..fc839c55da71a9d504c1263845a089bf20912d2d 100644 (file)
--- a/device/lib/_divuint.c
+++ b/device/lib/_divuint.c
@@ -1,50 +1,177 @@
 /*-------------------------------------------------------------------------
 /*-------------------------------------------------------------------------

-

   _divuint.c :- routine for unsigned int (16 bit) division
 
              Ecrit par -  Jean-Louis Vern . jlvern@writeme.com (1999)
 
   _divuint.c :- routine for unsigned int (16 bit) division
 
              Ecrit par -  Jean-Louis Vern . jlvern@writeme.com (1999)
 

-   This program is free software; you can redistribute it and/or modify it
-   under the terms of the GNU General Public License as published by the
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU Library General Public License as published by the

    Free Software Foundation; either version 2, or (at your option) any
    later version.
    Free Software Foundation; either version 2, or (at your option) any
    later version.

-   
-   This program is distributed in the hope that it will be useful,
+
+   This library 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
    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.
-   
-   You should have received a copy of the GNU General Public License
+   GNU Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public License

    along with this program; if not, write to the Free Software
    Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
    along with this program; if not, write to the Free Software
    Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

-   
+

    In other words, you are welcome to use, share and improve this program.
    You are forbidden to forbid anyone else to use, share and improve
    In other words, you are welcome to use, share and improve this program.
    You are forbidden to forbid anyone else to use, share and improve

-   what you give them.   Help stamp out software-hoarding!  
+   what you give them.   Help stamp out software-hoarding!

 -------------------------------------------------------------------------*/
 
 -------------------------------------------------------------------------*/
 

+/*   Assembler-functions are provided for:
+     mcs51 small
+     mcs51 small stack-auto
+*/
+
+#include <stdbool.h>
+
+#if !defined(SDCC_USE_XSTACK) && !defined(_SDCC_NO_ASM_LIB_FUNCS)
+#  if defined(SDCC_mcs51)
+#    if defined(SDCC_MODEL_SMALL)
+#      if defined(SDCC_STACK_AUTO)
+#        define _DIVUINT_ASM_SMALL_AUTO
+#      else
+#        define _DIVUINT_ASM_SMALL
+#      endif
+#    endif
+#  endif
+#endif
+
+#if defined _DIVUINT_ASM_SMALL || defined _DIVUINT_ASM_SMALL_AUTO
+
+static void
+_divuint_dummy (void) _naked
+{
+       _asm
+
+               .globl __divuint
+
+       __divuint:
+
+               #define count   r2
+               #define reste_l r3
+               #define reste_h r4
+               #define al      dpl
+               #define ah      dph
+
+#if defined(SDCC_STACK_AUTO) && !defined(SDCC_PARMS_IN_BANK1)
+
+               ar0 = 0                 ; BUG register set is not considered
+               ar1 = 1
+
+               .globl __divint
+
+               mov     a,sp
+               add     a,#-2           ; 2 bytes return address
+               mov     r0,a            ; r0 points to bh
+               mov     ar1,@r0         ; load bh
+               dec     r0
+               mov     ar0,@r0         ; load bl
+
+               #define bl      r0
+               #define bh      r1
+
+       __divint:                       ; entry point for __divsint
+
+
+#else // SDCC_STACK_AUTO
+
+#if !defined(SDCC_PARMS_IN_BANK1)
+#if defined(SDCC_NOOVERLAY)
+               .area DSEG    (DATA)
+#else
+               .area OSEG    (OVR,DATA)
+#endif
+
+               .globl __divuint_PARM_2
+               .globl __divsint_PARM_2
+
+       __divuint_PARM_2:
+       __divsint_PARM_2:
+               .ds     2
+
+               .area CSEG    (CODE)
+#endif // !SDCC_PARMS_IN_BANK1
+#if defined(SDCC_PARMS_IN_BANK1)
+               #define bl      (b1_0)
+               #define bh      (b1_1)
+#else
+               #define bl      (__divuint_PARM_2)
+               #define bh      (__divuint_PARM_2 + 1)
+#endif // SDCC_PARMS_IN_BANK1
+#endif // SDCC_STACK_AUTO
+
+               mov     count,#16
+               clr     a
+               mov     reste_l,a
+               mov     reste_h,a
+
+       loop:   mov     a,al            ; a <<= 1
+               add     a,acc
+               mov     al,a
+               mov     a,ah
+               rlc     a
+               mov     ah,a
+
+               mov     a,reste_l       ; reste <<= 1
+               rlc     a               ;   feed in carry
+               mov     reste_l,a
+               mov     a,reste_h
+               rlc     a
+               mov     reste_h,a
+
+               mov     a,reste_l       ; reste - b
+               subb    a,bl            ; here carry is always clear, because
+                                       ; reste <<= 1 never overflows
+               mov     b,a
+               mov     a,reste_h
+               subb    a,bh
+
+               jc      smaller         ; reste >= b?
+
+               mov     reste_h,a       ; -> yes;  reste = reste - b;
+               mov     reste_l,b
+               orl     al,#1
+       smaller:                        ; -> no
+               djnz    count,loop
+               ret
+
+       _endasm ;
+}
+
+#else  // defined _DIVUINT_ASM_SMALL || defined _DIVUINT_ASM_SMALL_AUTO
+

 #define MSB_SET(x) ((x >> (8*sizeof(x)-1)) & 1)
 
 #define MSB_SET(x) ((x >> (8*sizeof(x)-1)) & 1)
 

-unsigned int _divuint (unsigned int a, unsigned int b)
+unsigned int
+_divuint (unsigned int a, unsigned int b)

 {
 {

-       unsigned int reste = 0  ;
-       unsigned short count = 16;
-       bit c;
-
-       do{
-               // reste:a <- 0;
-               c = MSB_SET(a);
-               a <<= 1;
-               reste <<= 1;
-               if(c)
-                       reste |= 1;
-               
-               if(reste >= b){
-                       reste -= b;
-                       // a <- (result = 1)
-                       a |= 1;
-               }
-       } while(--count);
-       
-       return a;
+  unsigned int reste = 0;
+  unsigned char count = 16;
+  BOOL c;
+
+  do
+  {
+    // reste: a <- 0;
+    c = MSB_SET(a);
+    a <<= 1;
+    reste <<= 1;
+    if (c)
+      reste |= 1;
+
+    if (reste >= b)
+    {
+      reste -= b;
+      // a <- (result = 1)
+      a |= 1;
+    }
+  }
+  while (--count);
+  return a;

 }
 }

+
+#endif  // defined _DIVUINT_ASM_SMALL || defined _DIVUINT_ASM_SMALL_AUTO