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110 lines
8.2 KiB
110 lines
8.2 KiB
;* ======================================================================== *;
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;* TEXAS INSTRUMENTS, INC. *;
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;* *;
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;* IMGLIB DSP Image/Video Processing Library *;
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;* *;
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;* Release: Revision 1.04b *;
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;* CVS Revision: 1.8 Sun Sep 29 03:32:27 2002 (UTC) *;
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;* Snapshot date: 23-Oct-2003 *;
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;* *;
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;* This library contains proprietary intellectual property of Texas *;
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;* Instruments, Inc. The library and its source code are protected by *;
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;* various copyrights, and portions may also be protected by patents or *;
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;* other legal protections. *;
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;* *;
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;* This software is licensed for use with Texas Instruments TMS320 *;
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;* family DSPs. This license was provided to you prior to installing *;
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;* the software. You may review this license by consulting the file *;
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;* TI_license.PDF which accompanies the files in this library. *;
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;* ------------------------------------------------------------------------ *;
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;* Copyright (C) 2003 Texas Instruments, Incorporated. *;
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;* All Rights Reserved. *;
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;* ======================================================================== *;
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;* ======================================================================== *;
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;* Assembler compatibility shim for assembling 4.30 and later code on *;
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;* tools prior to 4.30. *;
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;* ======================================================================== *;
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;* ======================================================================== *;
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;* End of assembler compatibility shim. *;
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;* ======================================================================== *;
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* ========================================================================= *
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* TEXAS INSTRUMENTS, INC. *
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* *
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* NAME *
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* IMG_pix_expand *
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* *
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* REVISION DATE *
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* 19-Jan-2001 *
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* *
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* USAGE *
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* This routine is C-callable and can be called as: *
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* *
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* void IMG_pix_expand *
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* ( *
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* int n, /* # of elements */ *
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* const unsigned char *restrict in_data, /* Input data */ *
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* short *restrict out_data /* Output data */ *
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* ) *
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* *
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* *
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* DESCRIPTION *
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* The code takes an array of bytes and promotes them to half-words *
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* by zero-extension. *
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* *
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* This is the C equivalent of the assembly code, without *
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* restrictions. The assembly code has restrictions, as noted below. *
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* *
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* void IMG_pix_expand *
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* ( *
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* int n, *
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* const unsigned char *restrict in_data, *
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* short *restrict out_data *
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* ) *
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* { *
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* int i; *
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* *
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* for (i = 0; i < n; i++) *
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* out_data[i] = in_data[i]; *
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* } *
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* *
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* ASSUMPTIONS *
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* Input and output arrays must be double-word (8-byte) aligned. *
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* *
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* The input must be at least 16 elements long and contain a *
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* multiple of 16 elements. *
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* *
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* NOTE *
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* Interrupts are masked during the entire duration of this *
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* function, as the entire function occurs within branch delay slots. *
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* *
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* MEMORY NOTE *
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* No bank conflicts occur. This is a LITTLE ENDIAN implementation. *
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* *
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* TECHNIQUES *
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* The loop is unrolled 16 times, loading bytes with LDDW. It uses *
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* UNPKHU4 and UNPKLU4 to unpack the data and store the results with *
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* STDW. *
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* *
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* To shave a few extra cycles from the function, the return branch *
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* is issued from within the kernel. *
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* *
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* CYCLES *
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* cycles = 3 * n/16 + 15. *
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* For n = 1072, cycles = 216. *
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* *
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* CODESIZE *
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* 108 bytes. *
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* *
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* ------------------------------------------------------------------------- *
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* Copyright (c) 2003 Texas Instruments, Incorporated. *
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* All Rights Reserved. *
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* ========================================================================= *
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.global _IMG_pix_expand
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* ========================================================================= *
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* End of file: img_pix_expand.h64 *
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* ------------------------------------------------------------------------- *
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* Copyright (c) 2003 Texas Instruments, Incorporated. *
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* All Rights Reserved. *
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* ========================================================================= *
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