Add openmax dl routines for review. MUST NOT BE LANDED

third_party/openmax_dl/dl/sp/src/armSP_FFT_CToC_SC16_Radix2_fs_unsafe_s.S

+@//
+@//  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 file was originally licensed as follows. It has been
+@//  relicensed with permission from the copyright holders.
+
+@//
+@//
+@// 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 "dl/api/armCOMM_s.h"
+#include "dl/api/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                            r0
+#define pDst                            r2
+#define pTwiddle                        r1
+#define pPingPongBuf                    r5
+#define subFFTNum                       r6
+#define subFFTSize                      r7
+
+
+@//Output Registers
+
+
+@//Local Scratch Registers
+
+#define pointStep                       r3
+#define outPointStep                    r3
+#define grpSize                         r4
+#define setCount                        r4
+#define step                            r8
+#define dstStep                         r8
+
+@// Neon Registers
+
+#define dX0                             D0.S16
+#define dX1                             D1.S16
+#define dY0                             D2.S16
+#define dY1                             D3.S16
+#define dX0S32                          D0.S32
+#define dX1S32                          D1.S32
+#define dY0S32                          D2.S32
+#define dY1S32                          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
+
+        .ifeqs "\scaled", "TRUE"
+
+            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
+
+        .endm
+
+
+
+        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
+
+
+
+
+    .END