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Floating-point Convert precision (scalar). This instruction converts the floating-point value in the SIMD&FP source register to the precision for the destination register data type using the rounding mode that is determined by the FPCR and writes the result to the SIMD&FP destination register.

浮点转换精度（标量）。此指令使用FPCR确定的舍入模式将SIMD&FP源寄存器中的浮点值转换为目标寄存器数据类型的精度，并将结果写入SIMD&FPP目标寄存器。

Half-precision to single-precision variant
    Applies when type == 11 && opc == 00.
    FCVT <Sd>, <Hn>

Half-precision to double-precision variant
    Applies when type == 11 && opc == 01.
    FCVT <Dd>, <Hn>

Single-precision to half-precision variant
    Applies when type == 00 && opc == 11.
    FCVT <Hd>, <Sn>

Single-precision to double-precision variant
    Applies when type == 00 && opc == 01.
    FCVT <Dd>, <Sn>

Double-precision to half-precision variant
    Applies when type == 01 && opc == 11.
    FCVT <Hd>, <Dn>

Double-precision to single-precision variant
    Applies when type == 01 && opc == 00.
    FCVT <Sd>, <Dn>

int main()
{
    char s[16];
    int a;
    float f;

    strcpy(&s[0], "Hello, xiaozhi!");
    a = 0x666;
    f = 6.6;

    printf("%s %x %f.\n", &s[0], a, f);
}

/*
        Hello, xiaozhi! 666 6.600000.
 */

#if 0

/*
 * arm
 */
000000000040055c <main>:
  40055c:       a9bd7bfd        stp     x29, x30, [sp, #-48]!
  400560:       910003fd        mov     x29, sp                         // x29=fp=sp
  400564:       910063a2        add     x2, x29, #0x18                  // x2=x29+0x18
  400568:       90000000        adrp    x0, 400000 <_init-0x3e8>        // x0=400000
  40056c:       9119a000        add     x0, x0, #0x668                  // x0=400668
  400570:       a9400400        ldp     x0, x1, [x0]                    // x0=[x0], x1=[x0+8]
  400574:       a9000440        stp     x0, x1, [x2]                    // [x2]=x0, [x2+8]=x1
  400578:       5280ccc0        mov     w0, #0x666                      // #1638 w0=0x666
  40057c:       b9002fa0        str     w0, [x29, #44]                  // x29+44=w0
  400580:       52866660        mov     w0, #0x3333                     // #13107       w0=0x3333
  400584:       72a81a60        movk    w0, #0x40d3, lsl #16            // w0=0x40d3<<16
  400588:       1e270000        fmov    s0, w0                          // s0=w0
  40058c:       bd002ba0        str     s0, [x29, #40]                  // x29+40=s0
  400590:       bd402ba0        ldr     s0, [x29, #40]                  // s0=x29+40
  400594:       1e22c000        fcvt    d0, s0                          // d0=s0
  400598:       910063a1        add     x1, x29, #0x18                  // x1=x29+0x18
  40059c:       90000000        adrp    x0, 400000 <_init-0x3e8>
  4005a0:       9119e000        add     x0, x0, #0x678
  4005a4:       b9402fa2        ldr     w2, [x29, #44]                  // w2=x29+44
  4005a8:       97ffffaa        bl      400450 <printf@plt>             // printf()
  4005ac:       52800000        mov     w0, #0x0                        // #0
  4005b0:       a8c37bfd        ldp     x29, x30, [sp], #48
  4005b4:       d65f03c0        ret
 #endif