| ;// |
| ;// |
| ;// File Name: armSP_FFT_CToC_SC16_Radix2_fs_unsafe_s.s |
| ;// OpenMAX DL: v1.0.2 |
| ;// Last Modified Revision: 6693 |
| ;// Last Modified Date: Tue, 10 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 |
| |
| |
| |
| ;// 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 |
| |
| pointStep RN 3 |
| outPointStep RN 3 |
| grpSize RN 4 |
| setCount RN 4 |
| step RN 8 |
| dstStep RN 8 |
| |
| ;// Neon Registers |
| |
| dX0 DN D0.S16 |
| dX1 DN D1.S16 |
| dY0 DN D2.S16 |
| dY1 DN D3.S16 |
| dX0S32 DN D0.S32 |
| dX1S32 DN D1.S32 |
| dY0S32 DN D2.S32 |
| dY1S32 DN D3.S32 |
| |
| |
| MACRO |
| FFTSTAGE $scaled, $inverse, $name |
| |
| ;// Define stack arguments |
| |
| |
| ;// update subFFTSize and subFFTNum into RN6 and RN7 for the next stage |
| |
| |
| MOV subFFTSize,#2 |
| LSR grpSize,subFFTNum,#1 |
| MOV subFFTNum,grpSize |
| |
| |
| ;// pT0+1 increments pT0 by 8 bytes |
| ;// pT0+pointStep = increment of 4*pointStep bytes = 2*grpSize bytes |
| ;// Note: outPointStep = pointStep for firststage |
| ;// Note: setCount = grpSize/2 (reuse the updated grpSize for setCount) |
| |
| MOV pointStep,grpSize,LSL #2 |
| RSB step,pointStep,#4 |
| |
| |
| ;// Loop on the sets for grp zero: 1 set at a time |
| |
| grpZeroSetLoop$name |
| |
| VLD1 {dX0S32[0]},[pSrc],pointStep |
| VLD1 {dX1S32[0]},[pSrc],step ;// step = -pointStep + 4 |
| SUBS setCount,setCount,#1 ;// decrement the loop counter |
| |
| IF $scaled |
| |
| VHADD dY0,dX0,dX1 |
| VHSUB dY1,dX0,dX1 |
| |
| ELSE |
| |
| VADD dY0,dX0,dX1 |
| VSUB dY1,dX0,dX1 |
| |
| |
| ENDIF |
| |
| VST1 {dY0S32[0]},[pDst],outPointStep |
| VST1 {dY1S32[0]},[pDst],dstStep ;// dstStep = step = -pointStep + 4 |
| |
| BGT grpZeroSetLoop$name |
| |
| |
| ;// reset pSrc to pDst for the next stage |
| SUB pSrc,pDst,pointStep ;// pDst -= 2*grpSize |
| MOV pDst,pPingPongBuf |
| |
| MEND |
| |
| |
| |
| M_START armSP_FFTFwd_CToC_SC16_Radix2_fs_OutOfPlace_unsafe,r4 |
| FFTSTAGE {FALSE},{FALSE},FWD |
| M_END |
| |
| |
| |
| M_START armSP_FFTInv_CToC_SC16_Radix2_fs_OutOfPlace_unsafe,r4 |
| FFTSTAGE {FALSE},{TRUE},INV |
| M_END |
| |
| |
| |
| M_START armSP_FFTFwd_CToC_SC16_Sfs_Radix2_fs_OutOfPlace_unsafe,r4 |
| FFTSTAGE {TRUE},{FALSE},FWDSFS |
| M_END |
| |
| |
| |
| M_START armSP_FFTInv_CToC_SC16_Sfs_Radix2_fs_OutOfPlace_unsafe,r4 |
| FFTSTAGE {TRUE},{TRUE},INVSFS |
| M_END |
| |
| |
| ENDIF ;//CORTEXA8 |
| |
| |
| END |