| ;// |
| ;// |
| ;// File Name: armSP_FFT_CToC_SC16_Radix2_ps_unsafe_s.s |
| ;// OpenMAX DL: v1.0.2 |
| ;// Last Modified Revision: 6740 |
| ;// Last Modified Date: Wed, 18 Jul 2007 |
| ;// |
| ;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved. |
| ;// |
| ;// |
| ;// |
| ;// Description: |
| ;// Compute a Radix 2 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 |
| |
| IF CortexA8 |
| |
| ;//Input Registers |
| |
| pSrc RN 0 |
| pDst RN 2 |
| pTwiddle RN 1 |
| subFFTNum RN 6 |
| subFFTSize RN 7 |
| |
| |
| ;//Output Registers |
| |
| |
| ;//Local Scratch Registers |
| |
| outPointStep RN 3 |
| grpCount RN 4 |
| dstStep RN 5 |
| twStep RN 8 |
| pTmp RN 4 |
| |
| ;// Neon Registers |
| |
| dW1S32 DN D0.S32 |
| dW2S32 DN D1.S32 |
| dW1 DN D0.S16 |
| dW2 DN D1.S16 |
| |
| dX0 DN D2.S16 |
| dX1 DN D3.S16 |
| dX2 DN D4.S16 |
| dX3 DN D5.S16 |
| dY0 DN D6.S16 |
| dY1 DN D7.S16 |
| dY2 DN D8.S16 |
| dY3 DN D9.S16 |
| qT0 QN Q5.S32 |
| qT1 QN Q6.S32 |
| |
| |
| MACRO |
| FFTSTAGE $scaled, $inverse, $name |
| |
| ;// Define stack arguments |
| |
| |
| ;// Update grpCount and grpSize rightaway inorder to reuse pGrpCount and pGrpSize regs |
| |
| |
| LSL grpCount,subFFTSize,#1 |
| |
| |
| ;// update subFFTSize for the next stage |
| MOV subFFTSize,grpCount |
| |
| ;// pOut0+1 increments pOut0 by 8 bytes |
| ;// pOut0+outPointStep == increment of 4*outPointStep bytes = 2*size bytes |
| SMULBB outPointStep,grpCount,subFFTNum |
| MOV twStep,subFFTNum,LSL #1 |
| LSR subFFTNum,subFFTNum,#1 ;//grpSize |
| |
| |
| RSB dstStep,outPointStep,#8 |
| |
| |
| ;// Note: pointStep is 8 in this case: so need of extra reg |
| ;// Loop on the groups: 2 groups at a time |
| |
| grpLoop$name |
| |
| VLD1 dW1S32[],[pTwiddle],twStep ;//[wi | wr] |
| VLD1 dW2S32[],[pTwiddle],twStep |
| |
| ;// Process the sets for each grp: 2 sets at a time (no set looping required) |
| |
| VLD1 dX0,[pSrc]! ;// point0: of set0,set1 of grp0 |
| VLD1 dX1,[pSrc]! ;// point1: of set0,set1 of grp0 |
| VLD1 dX2,[pSrc]! ;// point0: of set0,set1 of grp1 |
| VLD1 dX3,[pSrc]! ;// point1: of set0,set1 of grp1 |
| |
| SUBS grpCount,grpCount,#4 ;// decrement the loop counter |
| VUZP dW1,dW2 |
| VUZP dX1,dX3 |
| |
| IF $inverse |
| VMULL qT0,dX1,dW1 |
| VMLAL qT0,dX3,dW2 ;// real part |
| VMULL qT1,dX3,dW1 |
| VMLSL qT1,dX1,dW2 ;// imag part |
| |
| ELSE |
| VMULL qT0,dX1,dW1 |
| VMLSL qT0,dX3,dW2 ;// real part |
| VMULL qT1,dX3,dW1 |
| VMLAL qT1,dX1,dW2 ;// imag part |
| |
| ENDIF |
| |
| VRSHRN dX1,qT0,#15 |
| VRSHRN dX3,qT1,#15 |
| |
| VZIP dX1,dX3 |
| |
| |
| IF $scaled |
| |
| VHSUB dY0,dX0,dX1 |
| VHADD dY1,dX0,dX1 |
| VHSUB dY2,dX2,dX3 |
| VHADD dY3,dX2,dX3 |
| |
| ELSE |
| |
| VSUB dY0,dX0,dX1 |
| VADD dY1,dX0,dX1 |
| VSUB dY2,dX2,dX3 |
| VADD dY3,dX2,dX3 |
| |
| |
| |
| ENDIF |
| |
| VST1 dY0,[pDst],outPointStep ;// point0: of set0,set1 of grp0 |
| VST1 dY1,[pDst],dstStep ;// dstStep = -outPointStep + 8 |
| VST1 dY2,[pDst],outPointStep ;// point0: of set0,set1 of grp1 |
| VST1 dY3,[pDst],dstStep ;// point1: of set0,set1 of grp1 |
| |
| |
| BGT grpLoop$name |
| |
| |
| ;// Reset and Swap pSrc and pDst for the next stage |
| MOV pTmp,pDst |
| SUB pDst,pSrc,outPointStep,LSL #1 ;// pDst -= 2*size; pSrc -= 4*size bytes |
| SUB pSrc,pTmp,outPointStep |
| |
| ;// Reset pTwiddle for the next stage |
| SUB pTwiddle,pTwiddle,outPointStep ;// pTwiddle -= 2*size bytes |
| |
| MEND |
| |
| |
| |
| M_START armSP_FFTFwd_CToC_SC16_Radix2_ps_OutOfPlace_unsafe,r4 |
| FFTSTAGE {FALSE},{FALSE},FWD |
| M_END |
| |
| |
| |
| M_START armSP_FFTInv_CToC_SC16_Radix2_ps_OutOfPlace_unsafe,r4 |
| FFTSTAGE {FALSE},{TRUE},INV |
| M_END |
| |
| |
| |
| M_START armSP_FFTFwd_CToC_SC16_Sfs_Radix2_ps_OutOfPlace_unsafe,r4 |
| FFTSTAGE {TRUE},{FALSE},FWDSFS |
| M_END |
| |
| |
| |
| M_START armSP_FFTInv_CToC_SC16_Sfs_Radix2_ps_OutOfPlace_unsafe,r4 |
| FFTSTAGE {TRUE},{TRUE},INVSFS |
| M_END |
| |
| |
| ENDIF ;//CORTEXA8 |
| |
| |
| END |