Add openmax dl routines for review. MUST NOT BE LANDED

third_party/openmax_dl/dl/sp/src/omxSP_FFTInv_CCSToR_S32S16_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_FFTInv_CCSToR_S32S16_Sfs_s.s
+@// OpenMAX DL: v1.0.2
+@// Last Modified Revision:   7098
+@// Last Modified Date:       Thu, 16 Aug 2007
+@// 
+@// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
+@// 
+@// 
+@//
+@// Description:
+@// Compute an inverse FFT for a 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)
+        
+        .extern  omxSP_FFTInv_CCSToR_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 N               r6
+#define pOut            r5
+#define pTmpDst         r4
+
+
+@// Neon registers
+
+#define dX0     D0.S32
+#define dX01    D1.S32  
+#define qX0     Q0.S32
+#define dY0     D2.S16
+#define dY0S32  D2.S32
+
+
+
+    @// Allocate stack memory required by the function
+        
+    @// Write function header
+        M_START     omxSP_FFTInv_CCSToR_S32S16_Sfs,r11,d15
+        
+        .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]
+        
+        
+        MOV     pTmpDst,pDst
+        ADD     pDst,pOut,N, LSL #2
+        
+        
+        BL      omxSP_FFTInv_CCSToR_S32_Sfs
+        
+        ADD     pDst,pOut,N, LSL #2
+        
+        CMP     N,#2
+        BGT     copyLoop
+        BEQ     copyS32ToS16
+        VLD1    dX0[0],[pDst]
+        VQMOVN  dY0,qX0
+        VST1    dY0[0],[pTmpDst]
+        
+        B       End
+        
+copyS32ToS16:   
+        
+        VLD1    dX0,[pDst]
+        VQMOVN  dY0,qX0
+        VST1    dY0S32[0],[pTmpDst]
+        B       End
+
+copyLoop:               
+              
+        VLD1    {dX0,dX01},[pDst]!
+        SUBS    N,N,#4
+        VQMOVN  dY0,qX0
+        VST1    dY0,[pTmpDst]!
+        
+        BGT     copyLoop
+                
+                       
+End:                            
+        @// Set return value
+        MOV     result, #OMX_Sts_NoErr       
+
+        @// Write function tail
+        M_END
+        
+    .end