| // |
| // Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. |
| // |
| // Use of this source code is governed by a BSD-style license |
| // that can be found in the LICENSE file in the root of the source |
| // tree. An additional intellectual property rights grant can be found |
| // in the file PATENTS. All contributing project authors may |
| // be found in the AUTHORS file in the root of the source tree. |
| // |
| // This is a modification of armSP_FFT_CToC_SC32_Radix2_fs_unsafe_s.S |
| // to support float instead of SC32. |
| // |
| |
| // |
| // Description: |
| // Compute the first stage of a Radix 2 DIT in-order out-of-place FFT |
| // stage for a N point complex signal. |
| // |
| // |
| |
| |
| // Include standard headers |
| |
| #include "dl/api/arm/arm64COMM_s.h" |
| #include "dl/api/arm/omxtypes_s.h" |
| |
| |
| // 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 |
| |
| |
| //Input Registers |
| |
| #define pSrc x0 |
| #define pDst x1 |
| #define pTwiddle x2 |
| #define pSubFFTNum x3 |
| #define pSubFFTSize x4 |
| |
| |
| //Output Registers |
| |
| |
| //Local Scratch Registers |
| |
| #define subFFTNum x5 |
| #define subFFTSize x6 |
| #define pointStep x7 |
| #define outPointStep x7 |
| #define grpSize x8 |
| #define setCount x8 |
| #define step x9 |
| #define dstStep x9 |
| |
| // Neon Registers |
| #define dX0 v0.2s |
| #define dX1 v1.2s |
| #define dY0 v2.2s |
| #define dY1 v3.2s |
| |
| .MACRO FFTSTAGE scaled, inverse, name |
| |
| // Define stack arguments |
| |
| // Move args values into our work registers |
| ldr subFFTNum, [pSubFFTNum] |
| ldr subFFTSize, [pSubFFTSize] |
| |
| // 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 8*pointStep bytes = 4*grpSize bytes |
| // Note: outPointStep = pointStep for firststage |
| // Note: setCount = grpSize/2 (reuse the updated grpSize for setCount) |
| |
| lsl pointStep, grpSize, #3 |
| rsb step, pointStep, #8 |
| |
| // Loop on the sets for grp zero |
| |
| grpZeroSetLoop\name : |
| |
| LD1 {dX0},[pSrc],pointStep |
| LD1 {dX1},[pSrc],step // step = -pointStep + 8 |
| |
| SUBS setCount,setCount,#1 |
| |
| fadd dY0,dX0,dX1 |
| fsub dY1,dX0,dX1 |
| |
| ST1 {dY0},[pDst],outPointStep |
| // dstStep = step = -pointStep + 8 |
| ST1 {dY1},[pDst],dstStep |
| |
| BGT grpZeroSetLoop\name |
| |
| |
| // Save subFFTNum and subFFTSize for next stage |
| str subFFTNum, [pSubFFTNum] |
| str subFFTSize, [pSubFFTSize] |
| |
| .endm |
| |
| |
| |
| M_START armSP_FFTFwd_CToC_FC32_Radix2_fs_OutOfPlace |
| FFTSTAGE "FALSE","FALSE",fwd |
| M_END |
| |
| |
| |
| M_START armSP_FFTInv_CToC_FC32_Radix2_fs_OutOfPlace |
| FFTSTAGE "FALSE","TRUE",inv |
| M_END |
| |
| .end |