C906运行应用程序，发现不能跑浮点运算

cm_mkblock LV 3

[MK_AUDIO] state switch: IDLE --> Energy
[MK_AUDIO] CAP: chunk_bytes=2048
[MK_AUDIO] CAP: frame_bytes=2
[MK_AUDIO] capture open ok
[MK_AUDIO] --------1-------
[MK_AUDIO] --------2-------
[MK_AUDIO] ------=================================================================================================
                                         EXC_INST_ACCESS              
=====================================================================================================

gprs:
 x0:0x0000000000000000   ra:0x0000000000000012   sp:0x000000000873c090   gp:0x0000000008382560
 tp:0x0000000000000000   t0:0x000000000873c070   t1:0x000000000820734c   t2:0x00000000083155d8
 s0:0x000000000873c070   s1:0x0000000000000011   a0:0x000000000821c4f0   a1:0x000000000873c1b8
 a2:0x000000000821c578   a3:0x00000000083688a8   a4:0x0000000000000000   a5:0x000000000838c730
 a6:0x00000000082e3d50   a7:0x00000000083688a8   s2:0x000000000000000b   s3:0x0000000000000000
 s5:0xa5a5a5a5a5a5a5a5   s5:0xa5a5a5a5a5a5a5a5   s6:0xa5a5a5a5a5a5a5a5   s7:0xa5a5a5a5a5a5a5a5
 s8:0xa5a5a5a5a5a5a5a5   s9:0x0000000008315698  s10:0x00000000083155f8  s11:0x00000000083155d8
 t3:0x00000000083155c8   t4:0x00000000083688a8   t5:0x0000000008315698   t6:0x0000000008315868

other:
mepc    :0x0000000008201202
mcause  :0x0000000000000001
mtval   :0x0000000008201202
mstatus :0x0000000a00204900
mscratch:0x0000000000000000

-------backtrace-----------
backtrace : 0X08201202 
backtrace : invalid lr(0000000000000019)
backtrace : invalid lr
---------------------------
==> Round [1] <==
lpsram Heap:
    Total Size :  4318624 Bytes    ( 4217 KB)
          Free :   792704 Bytes    (  774 KB)
      Min Free :   788912 Bytes    (  770 KB)

hpsram Heap:
    Total Size :  8388576 Bytes    ( 8191 KB)
          Free :  8388576 Bytes    ( 8191 KB)
      Min Free :  8388576 Bytes    ( 8191 KB)


      List Task MIN Free Stack(unit: word)      
Task          State  Priority  Stack      #
************************************************

cm_mkblock LV 3

@cm_mkblock
错误地方：
double rms = rmsu / (double)((n-1) * sqrt(x0));
double dB = 20 * log10(rms);

能否支持浮点运行