(.text+OxleO): undefined reference to "_floatsisf'
main.о:  In function 'rs_transmit_digit':
(.text+Oxlf8):  undefined reference to "_floatsisf'
main, о:  In function    'rs_transmit_digit' :
(.text+0x204):  undefined reference to '_mulsf3'
main.о:  In function 'rs_transmit_digit1:
(.text+0x224):  undefined reference to '_fixsfsi'
main, о :  In function    rs_transmit_digit' :
(.text+0x808):  undefined reference to "_subsf31
main.o:  In function 'cycle_2_datchika':
(.text+0xac8):  undefined reference to "_addsf31
main.o:  In function "cycle_2_datchika1:
(.text+0xb2c): undefined reference to "_extendsfdf2'
main.o:  In function ''cycle_2_datchika' :
(.text+0xb58): undefined reference to "_divdf31
main.o:  In function 'cycle_2_datchika1:
(.text+Oxcdc): undefined reference to "_truncdfsf2'
main.o:  In function "cycle_2_datchika1:
( . text+0xce4) : undefined reference to   _truncdf sf 2 1
main.o:  In function vcycle_2_datchika1:
(.text+0xe48):  undefined reference to "_subdf3'
main.o:   In function "cycle_2_datchika1:
(.text+0xe68):  undefined reference to "_truncdfsf21
с:\kgp_mips_elf\mips-kgp-elf\lib\libm.a(lib_a-w_sqrt.o): In function "sqrf: (.text.sgrt+0x54):  undefined reference to -_ltdf21
с:\kgp_mips_elf\mips-kgp-elf\lib\libm.a(lib_a-w_sqrt.o): In function "sqrt": (.text.sqrt+0xa8):  undefined reference to "_divdf3'
c:\kgp_mips_elf\mips-kgp-elf\lib\libm.adib_a-e_sqrt.o):  In function "_ieee754__sqrt' :
(.text._ieee754_sqrt+0x34):  undefined reference to "_muldf3'
с:\kgp_mips_elf\mips-kgp-elf\lib\libm.a(lib_a-e_sqrt.o):  In function _ieee754_sqrt1 :
(.text._ieee754_sqrt+0x48):  undefined reference to "_adddf3'
с:\kgp_mips_elf\mips-kgp-elf\lib\libm.a(lib_a-e_sqrt.o):  In function "_ieee754_sqrt1:
(.text._ieee754_sqrt+0x84): undefined reference to *_subdf3'
с:\kgp_mips_elf\mips-kgp-elf\lib\libm.a(lib_a-e_sqrt.o):  In function "_ieee754_sqrt1:
(.text._ieee754_sqrt+0x98): undefined reference to "_divdf31
cs-make:  ***   [main.elf]   Error 1

#define fixed long
fixed pi =        0x3243f;            // 3,14


fixed sin_fixed(fixed x){
    unsigned char a;
    fixed x_to_pi; // = x * pi / 180;
    fixed res = x * pi / 180;

    if ( x >=0 && x<=90 ){
        a = 1;
        x_to_pi = res;
    }
    if ( x >90 && x<=180 ){
        a = 1;
        x_to_pi = -1*(res - pi);
    }
    if ( x >180 && x<=270 ){
        a = -1;
        x_to_pi = res - pi;
    }
    if ( x >270 && x<360 ){
        a = -1;
        x_to_pi = -1*(res - pi<<1);
    }
    
    fixed s = (( x_to_pi * x_to_pi ) >> 15);
    res = (x_to_pi * ((s/6) * ((s/20) - (1<<15)) + (1<<15) )) >> 15;

    if(a>0){
        return   res;
    }
    else{
        return -1 * res;
    }
}

alx% grep -rl _floatsisf /usr/local/arm-elf/lib
/usr/local/arm-elf/lib/thumb/libm.a
/usr/local/arm-elf/lib/libm.a

alx% arm-elf-nm /usr/local/arm-elf/lib/libm.a|grep _floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf
         U __floatsisf

alx% grep -rl _floatsisf /usr/local/lib/gcc/arm-elf
/usr/local/lib/gcc/arm-elf/4.5.2/plugin/include/insn-flags.h
/usr/local/lib/gcc/arm-elf/4.5.2/libgcc.a
/usr/local/lib/gcc/arm-elf/4.5.2/thumb/libgcc.a
/usr/local/lib/gcc/arm-elf/4.5.2/fpu/libgcc.a
alx% arm-elf-nm /usr/local/lib/gcc/arm-elf/4.5.2/libgcc.a |grep _floatsisf
000001d0 T __floatsisf