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fft index berechnung wieder in Software

This commit is contained in:
Jörg Thalheim 2015-03-07 12:03:22 +01:00
parent 24124a832a
commit c3e2abfb71
2 changed files with 4 additions and 21 deletions
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10
fft.c
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@ -121,15 +121,9 @@ int fix_fft(fixed fr[], fixed fi[], int m, int inverse)
FFT_reg reg;
fixed *reg_s = ((fixed*) &reg);
WUR_FFT_loop(m);
while(1)
for(i=m; i<n; i+=istep)
{
i = RUR_FFT_loop();
xtbool t;
FFT_loop_check(n, istep, t, j);
if(!t)
break;
j = i + l;
reg_s[3] = fr[i];
reg_s[2] = fr[j];

15
fft_inst.tie
View File

@ -132,9 +132,6 @@ table SIN_wave 16 1024 {
regfile FFT_reg 64 2 fftv
state FFT_loop 32 add_read_write
operation FFT_shift_check {in AR fr, in AR fi, out BR needs_shift} {}
{
// fr > 0
@ -150,14 +147,6 @@ operation FFT_shift_check {in AR fr, in AR fi, out BR needs_shift} {}
assign needs_shift = jc1[0] | jc2[0] | jc3[4] | jc4[4];
}
operation FFT_loop_check {in AR n, in AR istep, out BR t, out AR j} {inout FFT_loop}
{
wire [4:0] cmpres = TIEcmp(FFT_loop, n, 1'b0);
assign t = cmpres[4];
assign FFT_loop = TIEadd(FFT_loop, istep, 1'b0);
assign j = TIEadd(FFT_loop, {1'b0, istep[15:1]}, 1'b0);
}
operation FFT_bit_reverse {inout AR m, out AR mr, in AR mm} {}
{
wire [15:0] x = TIEadd(m, 0, 1'b1);
@ -224,7 +213,7 @@ format flix64_0 64 { flix64_0_slot0, flix64_0_slot1 }
slot_opcodes flix64_0_slot0 {
ADD, ADDI, BGEU, BLTU, L16SI, L32I, MOVNEZ, NEG, NOP, S16I, SEXT, SRAI, SUB, FFT_twiddle,
ld.FFT_reg, mv.FFT_reg, st.FFT_reg, FFT_loop_check, FFT_calc, FFT_shift_check, FFT_bit_reverse}
ld.FFT_reg, mv.FFT_reg, st.FFT_reg, FFT_calc, FFT_shift_check, FFT_bit_reverse}
slot_opcodes flix64_0_slot1 {
ADD, ADDI, ADDX2, xt_widebranch18, BEQZ, BGE, BLT, BNEZ, FFT_twiddle, J,
MOV.N, NOP, SEXT, SRAI, SUB, FFT_loop_check, FFT_calc, FFT_shift_check, FFT_bit_reverse}
MOV.N, NOP, SEXT, SRAI, SUB, FFT_calc, FFT_shift_check, FFT_bit_reverse}