Add openmax dl routines for review. MUST NOT BE LANDED

third_party/openmax_dl/dl/sp/src/omxSP_FFTFwd_RToCCS_S16S32_Sfs_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:  omxSP_FFTFwd_RToCCS_S16S32_Sfs_s.s
+@// OpenMAX DL: v1.0.2
+@// Last Modified Revision:   7403
+@// Last Modified Date:       Mon, 17 Sep 2007
+@// 
+@// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
+@// 
+@// 
+@//
+@// Description:
+@// Compute FFT for a real 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)
+        .extern  omxSP_FFTFwd_RToCCS_S32_Sfs
+        
+        
+@// Set debugging level        
+@//DEBUG_ON    SETL {TRUE}
+
+
+
+@// Guarding implementation by the processor name
+    
+    
+    
+    @// Guarding implementation by the processor name
+    
+@// Import symbols required from other files
+@// (For example tables)
+             
+    
+@//Input Registers
+
+#define pSrc            r0
+#define pDst            r1
+#define pFFTSpec        r2
+#define scale           r3
+        
+@// Output registers
+#define result          r0
+        
+#define pTmpDst         r4
+#define pTmpSrc         r5
+#define N               r6
+#define order           r7
+#define pOut            r8
+
+@// Neon registers
+
+#define dX0             D0.S16
+#define qY0             Q1.S32
+#define dY0S32          D2.S32
+#define qX0             Q1.S32
+#define dY1S32          D3.S32
+#define dX0S32          D0.S32
+
+
+
+
+    @// Allocate stack memory required by the function
+        
+    @// Write function header
+        M_START     omxSP_FFTFwd_RToCCS_S16S32_Sfs,r11,d15
+
+@ Structure offsets for the FFTSpec             
+        .set    ARMsFFTSpec_N, 0
+        .set    ARMsFFTSpec_pBitRev, 4
+        .set    ARMsFFTSpec_pTwiddle, 8
+        .set    ARMsFFTSpec_pBuf, 12
+        
+        @// Define stack arguments
+        
+        @// Read the size from structure and take log
+        LDR     N, [pFFTSpec, #ARMsFFTSpec_N]
+        
+        @// Read other structure parameters
+        @//LDR     pTwiddle, [pFFTSpec, #ARMsFFTSpec_pTwiddle]
+        LDR     pOut, [pFFTSpec, #ARMsFFTSpec_pBuf]
+        
+        
+        @//  N=1 Treat seperately  
+        CMP     N,#1
+        BGT     sizeGreaterThanOne
+        VLD1    dX0[0],[pSrc]
+        VMOVL   qY0,dX0
+        VST1    dY0S32[0],[pDst]
+        
+        MOV     pSrc,pDst
+        B       realS32FFT
+        
+sizeGreaterThanOne:        
+        MOV     N,N,ASR #1
+        
+        CLZ     order,N                             @// N = 2^order 
+        RSB     order,order,#31
+        
+        TST     order,#1
+        MOVEQ   pTmpDst,pOut
+        MOVNE   pTmpDst,pDst
+        MOV     pTmpSrc,pTmpDst
+        
+        CMP     N,#1
+        BGT     copyS16ToS32
+        VLD1    dX0S32[0],[pSrc]
+        VMOVL   qX0,dX0
+        VST1    dY0S32,[pTmpDst]
+        B       setpSrc
+
+        
+copyS16ToS32:               
+        
+        VLD1    dX0,[pSrc]!
+        SUBS    N,N,#2
+        VMOVL   qX0,dX0
+        VST1    {dY0S32,dY1S32},[pTmpDst]!
+        BGT     copyS16ToS32
+ 
+setpSrc:                
+        MOV     pSrc,pTmpSrc
+        
+        
+              
+realS32FFT:             
+        BL      omxSP_FFTFwd_RToCCS_S32_Sfs        
+        
+                
+                       
+End:                            
+        @// Set return value
+        MOV     result, #OMX_Sts_NoErr       
+
+        @// Write function tail
+        M_END
+        .end
+