| ;// |
| ;// |
| ;// File Name: armSP_FFT_CToC_SC16_Radix4_fs_unsafe_s.s |
| ;// OpenMAX DL: v1.0.2 |
| ;// Last Modified Revision: 7761 |
| ;// Last Modified Date: Wed, 26 Sep 2007 |
| ;// |
| ;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. |
| ;// |
| ;// |
| ;// |
| ;// Description: |
| ;// Compute a first stage Radix 4 FFT stage for a N point complex signal |
| ;// |
| ;// |
| |
| |
| ;// Include standard headers |
| |
| INCLUDE omxtypes_s.h |
| INCLUDE armCOMM_s.h |
| |
| M_VARIANTS CortexA8 |
| |
| ;// Import symbols required from other files |
| ;// (For example tables) |
| |
| |
| |
| |
| ;// Set debugging level |
| ;//DEBUG_ON SETL {TRUE} |
| |
| |
| |
| ;// Guarding implementation by the processor name |
| |
| |
| |
| ;// Guarding implementation by the processor name |
| |
| IF CortexA8 |
| |
| ;//Input Registers |
| |
| pSrc RN 0 |
| pDst RN 2 |
| pTwiddle RN 1 |
| pPingPongBuf RN 5 |
| subFFTNum RN 6 |
| subFFTSize RN 7 |
| |
| |
| ;//Output Registers |
| |
| |
| ;//Local Scratch Registers |
| |
| grpSize RN 3 |
| setCount RN 3 ;// Reuse grpSize as setCount |
| pointStep RN 4 |
| outPointStep RN 4 |
| setStep RN 8 |
| step1 RN 9 |
| step3 RN 10 |
| |
| ;// Neon Registers |
| |
| dXr0 DN D0.S16 |
| dXi0 DN D1.S16 |
| dXr1 DN D2.S16 |
| dXi1 DN D3.S16 |
| dXr2 DN D4.S16 |
| dXi2 DN D5.S16 |
| dXr3 DN D6.S16 |
| dXi3 DN D7.S16 |
| dYr0 DN D8.S16 |
| dYi0 DN D9.S16 |
| dYr1 DN D10.S16 |
| dYi1 DN D11.S16 |
| dYr2 DN D12.S16 |
| dYi2 DN D13.S16 |
| dYr3 DN D14.S16 |
| dYi3 DN D15.S16 |
| dZr0 DN D16.S16 |
| dZi0 DN D17.S16 |
| dZr1 DN D18.S16 |
| dZi1 DN D19.S16 |
| dZr2 DN D20.S16 |
| dZi2 DN D21.S16 |
| dZr3 DN D22.S16 |
| dZi3 DN D23.S16 |
| qY0 QN Q4.S16 |
| qY2 QN Q6.S16 |
| qX0 QN Q0.S16 |
| qX2 QN Q2.S16 |
| |
| qY1 QN Q5.S16 |
| qY3 QN Q7.S16 |
| qX1 QN Q1.S16 |
| qX3 QN Q3.S16 |
| qZ0 QN Q8.S16 |
| qZ1 QN Q9.S16 |
| |
| |
| MACRO |
| FFTSTAGE $scaled, $inverse, $name |
| |
| ;// Define stack arguments |
| |
| MOV pointStep,subFFTNum |
| ;// Update pSubFFTSize and pSubFFTNum regs |
| |
| |
| VLD2 {dXr0,dXi0},[pSrc@128],pointStep ;// data[0] |
| ;// Note: setCount = subFFTNum/4 (reuse the grpSize reg for setCount) |
| LSR grpSize,subFFTNum,#2 |
| MOV subFFTNum,grpSize |
| |
| |
| ;// pT0+1 increments pT0 by 4 bytes |
| ;// pT0+pointStep = increment of 4*pointStep bytes = grpSize bytes |
| ;// Note: outPointStep = pointStep for firststage |
| VLD2 {dXr1,dXi1},[pSrc@128],pointStep ;// data[1] |
| |
| |
| ;// Calculate the step of input data for the next set |
| ;//MOV setStep,pointStep,LSL #1 |
| MOV setStep,grpSize,LSL #3 |
| VLD2 {dXr2,dXi2},[pSrc@128],pointStep ;// data[2] |
| MOV step1,setStep |
| ADD setStep,setStep,pointStep ;// setStep = 3*pointStep |
| RSB setStep,setStep,#16 ;// setStep = - 3*pointStep+16 |
| |
| |
| VLD2 {dXr3,dXi3},[pSrc@128],setStep ;// data[3] |
| MOV subFFTSize,#4 ;// subFFTSize = 1 for the first stage |
| |
| |
| IF $scaled |
| VHADD qY0,qX0,qX2 ;// u0 |
| ELSE |
| VADD qY0,qX0,qX2 ;// u0 |
| ENDIF |
| RSB step3,pointStep,#0 |
| |
| ;// grp = 0 a special case since all the twiddle factors are 1 |
| ;// Loop on the sets: 4 sets at a time |
| |
| grpZeroSetLoop$name |
| |
| |
| IF $scaled |
| |
| ;// finish first stage of 4 point FFT |
| |
| VHSUB qY2,qX0,qX2 ;// u1 |
| SUBS setCount,setCount,#4 ;// decrement the set loop counter |
| |
| VLD2 {dXr0,dXi0},[pSrc@128],step1 ;// data[0] |
| VHADD qY1,qX1,qX3 ;// u2 |
| VLD2 {dXr2,dXi2},[pSrc@128],step3 |
| VHSUB qY3,qX1,qX3 ;// u3 |
| |
| |
| |
| ;// finish second stage of 4 point FFT |
| |
| VLD2 {dXr1,dXi1},[pSrc@128],step1 ;// data[1] |
| VHADD qZ0,qY0,qY1 ;// y0 |
| |
| VLD2 {dXr3,dXi3},[pSrc@128],setStep |
| |
| |
| IF $inverse |
| |
| VHSUB dZr3,dYr2,dYi3 ;// y3 |
| VHADD dZi3,dYi2,dYr3 |
| VST2 {dZr0,dZi0},[pDst@128],outPointStep |
| |
| VHSUB qZ1,qY0,qY1 ;// y2 |
| VST2 {dZr3,dZi3},[pDst@128],outPointStep |
| |
| VHADD dZr2,dYr2,dYi3 ;// y1 |
| VST2 {dZr1,dZi1},[pDst@128],outPointStep |
| VHSUB dZi2,dYi2,dYr3 |
| |
| VHADD qY0,qX0,qX2 ;// u0 (next loop) |
| VST2 {dZr2,dZi2},[pDst@128],setStep |
| |
| |
| ELSE |
| |
| VHADD dZr2,dYr2,dYi3 ;// y1 |
| VHSUB dZi2,dYi2,dYr3 |
| |
| VST2 {dZr0,dZi0},[pDst@128],outPointStep |
| VHSUB qZ1,qY0,qY1 ;// y2 |
| |
| VST2 {dZr2,dZi2},[pDst@128],outPointStep |
| VHSUB dZr3,dYr2,dYi3 ;// y3 |
| VHADD dZi3,dYi2,dYr3 |
| VST2 {dZr1,dZi1},[pDst@128],outPointStep |
| VHADD qY0,qX0,qX2 ;// u0 (next loop) |
| VST2 {dZr3,dZi3},[pDst@128],setStep |
| |
| ENDIF |
| |
| |
| ELSE |
| |
| ;// finish first stage of 4 point FFT |
| |
| VSUB qY2,qX0,qX2 ;// u1 |
| SUBS setCount,setCount,#4 ;// decrement the set loop counter |
| |
| VLD2 {dXr0,dXi0},[pSrc@128],step1 ;// data[0] |
| VADD qY1,qX1,qX3 ;// u2 |
| VLD2 {dXr2,dXi2},[pSrc@128],step3 |
| VSUB qY3,qX1,qX3 ;// u3 |
| |
| |
| |
| ;// finish second stage of 4 point FFT |
| |
| VLD2 {dXr1,dXi1},[pSrc@128],step1 ;// data[1] |
| VADD qZ0,qY0,qY1 ;// y0 |
| |
| VLD2 {dXr3,dXi3},[pSrc@128],setStep |
| |
| |
| IF $inverse |
| |
| VSUB dZr3,dYr2,dYi3 ;// y3 |
| VADD dZi3,dYi2,dYr3 |
| VST2 {dZr0,dZi0},[pDst@128],outPointStep |
| |
| VSUB qZ1,qY0,qY1 ;// y2 |
| VST2 {dZr3,dZi3},[pDst@128],outPointStep |
| |
| VADD dZr2,dYr2,dYi3 ;// y1 |
| VST2 {dZr1,dZi1},[pDst@128],outPointStep |
| VSUB dZi2,dYi2,dYr3 |
| |
| VADD qY0,qX0,qX2 ;// u0 (next loop) |
| VST2 {dZr2,dZi2},[pDst@128],setStep |
| |
| |
| ELSE |
| |
| VADD dZr2,dYr2,dYi3 ;// y1 |
| VSUB dZi2,dYi2,dYr3 |
| |
| VST2 {dZr0,dZi0},[pDst@128],outPointStep |
| VSUB qZ1,qY0,qY1 ;// y2 |
| |
| VST2 {dZr2,dZi2},[pDst@128],outPointStep |
| VSUB dZr3,dYr2,dYi3 ;// y3 |
| VADD dZi3,dYi2,dYr3 |
| VST2 {dZr1,dZi1},[pDst@128],outPointStep |
| VADD qY0,qX0,qX2 ;// u0 (next loop) |
| VST2 {dZr3,dZi3},[pDst@128],setStep |
| |
| ENDIF |
| |
| |
| ENDIF |
| |
| BGT grpZeroSetLoop$name |
| |
| |
| ;// reset pSrc to pDst for the next stage |
| SUB pSrc,pDst,pointStep ;// pDst -= grpSize |
| MOV pDst,pPingPongBuf |
| |
| |
| MEND |
| |
| |
| |
| M_START armSP_FFTFwd_CToC_SC16_Radix4_fs_OutOfPlace_unsafe,r4 |
| FFTSTAGE {FALSE},{FALSE},FWD |
| M_END |
| |
| |
| |
| M_START armSP_FFTInv_CToC_SC16_Radix4_fs_OutOfPlace_unsafe,r4 |
| FFTSTAGE {FALSE},{TRUE},INV |
| M_END |
| |
| |
| M_START armSP_FFTFwd_CToC_SC16_Sfs_Radix4_fs_OutOfPlace_unsafe,r4 |
| FFTSTAGE {TRUE},{FALSE},FWDSFS |
| M_END |
| |
| |
| M_START armSP_FFTInv_CToC_SC16_Sfs_Radix4_fs_OutOfPlace_unsafe,r4 |
| FFTSTAGE {TRUE},{TRUE},INVSFS |
| M_END |
| |
| |
| ENDIF ;//CortexA8 |
| |
| |
| |
| END |
