Improvements to float support in printf_fast

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

#define SDCC_FLOAT_LIB
#include <float.h>

static void dummy(void) _naked
{
        _asm
        .globl  fs_swap_a_b
fs_swap_a_b:
        mov     a, exp_a
        xch     a, exp_b
        mov     exp_a, a
        // is there a faster way to swap these 2 bits???
        // this trick with psw can play havoc with the resiter bank setting
        // mov  a, psw
        // swap a               // depends on sign bits in psw.1 & psw.5
        // mov  psw, a
         mov    c, sign_a
         rlc    a
         mov    c, sign_b
         mov    sign_a, c
         rrc    a
         mov    sign_b, c
        mov     a, r4
        xch     a, r7
        mov     r4, a
        mov     a, r3
        xch     a, r6
        mov     r3, a
        mov     a, r2
        xch     a, r5
        mov     r2, a
        ret
        _endasm;
}