299 lines
7.5 KiB
NASM
299 lines
7.5 KiB
NASM
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;;###########################################################################
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;;
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;; FILE: IQNfrac.asm
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;;
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;; TITLE: C Callable IQ Fractional Math Function
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;;
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;;###########################################################################
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;;
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;; Ver | Date | Who | Description of changes
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;; =====|=============|=======|==============================================
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;; 1.4 | 17 May 2002 | A. T. | Original Release.
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;; -----|-------------|-------|----------------------------------------------
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;; 1.4c | 20 Jun 2002 | A. T. | Fixed problem with function when operating
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;; | | | on negative values with a zero fractional
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;; | | | part, incorrect result was given.
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;; -----|-------------|-------|----------------------------------------------
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;; 1.4d | 30 Mar 2002 | SD | Frac was implemented as ((A >> q_value) << q_value) - A
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;; | | | Hence sign was changed. Reimplemented it correctly.
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;;------|-------------|-------|----------------------------------------------
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;;
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;;###########################################################################
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;;===========================================================================
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;; Function: _IQNfrac
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;;===========================================================================
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;;
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;; C Usage: extern long _IQfrac(long A); // no round or sat
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;;
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;;---------------------------------------------------------------------------
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;;
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;; On Entry: ACC = A in IQ format
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;;
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;; Regs Used: XT, XAR7
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;;
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;; On Exit: ACC = fractional portion of A stored as IQ
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;;
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;; Q range: 30 to 1
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;;
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;;---------------------------------------------------------------------------
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;; Algorithm: The fractional portion of the IQ number is calculated
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;; as follows:
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;;
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;; frac = A - ((A >> q_value) << q_value);
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;;
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;;---------------------------------------------------------------------------
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;; Benchmark:
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;;
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;; Cycles = 18 (includes LCR/LRETR)
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;;
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;;---------------------------------------------------------------------------
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;;#############################################################################
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;;!
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;;! Copyright: Copyright (C) 2023 Texas Instruments Incorporated -
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;;! All rights reserved not granted herein.
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;;! Limited License.
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;;!
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;;! Texas Instruments Incorporated grants a world-wide, royalty-free,
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;;! non-exclusive license under copyrights and patents it now or hereafter
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;;! owns or controls to make, have made, use, import, offer to sell and sell
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;;! ("Utilize") this software subject to the terms herein. With respect to the
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;;! foregoing patent license, such license is granted solely to the extent that
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;;! any such patent is necessary to Utilize the software alone. The patent
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;;! license shall not apply to any combinations which include this software,
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;;! other than combinations with devices manufactured by or for TI
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;;! ("TI Devices").
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;;! No hardware patent is licensed hereunder.
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;;!
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;;! Redistributions must preserve existing copyright notices and reproduce this
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;;! license (including the above copyright notice and the disclaimer and
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;;! (if applicable) source code license limitations below) in the documentation
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;;! and/or other materials provided with the distribution.
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;;!
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;;! Redistribution and use in binary form, without modification, are permitted
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;;! provided that the following conditions are met:
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;;!
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;;! * No reverse engineering, decompilation, or disassembly of this software is
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;;! permitted with respect to any software provided in binary form.
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;;! * Any redistribution and use are licensed by TI for use only
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;;! with TI Devices.
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;;! * Nothing shall obligate TI to provide you with source code for the
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;;! software licensed and provided to you in object code.
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;;!
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;;! If software source code is provided to you, modification and redistribution
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;;! of the source code are permitted provided that the following conditions
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;;! are met:
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;;!
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;;! * any redistribution and use of the source code, including any resulting
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;;! derivative works, are licensed by TI for use only with TI Devices.
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;;! * any redistribution and use of any object code compiled from the source
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;;! code and any resulting derivative works, are licensed by TI for use
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;;! only with TI Devices.
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;;!
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;;! Neither the name of Texas Instruments Incorporated nor the names of its
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;;! suppliers may be used to endorse or promote products derived from this
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;;! software without specific prior written permission.
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;;#############################################################################
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IQNfrac .macro q_value
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SETC OVM ; Turn overflow mode on
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CLRC TC ; Clear sign flag
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ABSTC ACC ; Take abs value of ACC
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MOV @T,#q_value ; Extract the fractional bits.
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LSR64 ACC:P,T ; P=frac bits (aligned to MSB)
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MOVB ACC,#0
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LSL64 ACC:P,T ; ACC=frac bits (aligned to LSB)
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NEGTC ACC ; Negate if sign set
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CLRC OVM ; Clear overflow mode
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LRETR
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.endm
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;; The value "GLOBAL_Q" needs to be supplied by the assembler
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;; using the "-dGLOBAL_Q=q_value" directive:
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.sect "IQmath"
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.if GLOBAL_Q == 30
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.def __IQ30frac
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__IQ30frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 29
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.def __IQ29frac
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__IQ29frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 28
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.def __IQ28frac
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__IQ28frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 27
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.def __IQ27frac
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__IQ27frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 26
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.def __IQ26frac
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__IQ26frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 25
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.def __IQ25frac
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__IQ25frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 24
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.def __IQ24frac
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__IQ24frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 23
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.def __IQ23frac
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__IQ23frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 22
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.def __IQ22frac
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__IQ22frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 21
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.def __IQ21frac
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__IQ21frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 20
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.def __IQ20frac
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__IQ20frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 19
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.def __IQ19frac
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__IQ19frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 18
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.def __IQ18frac
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__IQ18frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 17
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.def __IQ17frac
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__IQ17frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 16
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.def __IQ16frac
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__IQ16frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 15
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.def __IQ15frac
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__IQ15frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 14
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.def __IQ14frac
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__IQ14frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 13
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.def __IQ13frac
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__IQ13frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 12
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.def __IQ12frac
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__IQ12frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 11
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.def __IQ11frac
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__IQ11frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 10
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.def __IQ10frac
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__IQ10frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 9
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.def __IQ9frac
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__IQ9frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 8
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.def __IQ8frac
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__IQ8frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 7
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.def __IQ7frac
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__IQ7frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 6
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.def __IQ6frac
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__IQ6frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 5
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.def __IQ5frac
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__IQ5frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 4
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.def __IQ4frac
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__IQ4frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 3
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.def __IQ3frac
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__IQ3frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 2
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.def __IQ2frac
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__IQ2frac:
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IQNfrac GLOBAL_Q
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.endif
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.if GLOBAL_Q == 1
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.def __IQ1frac
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__IQ1frac:
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IQNfrac GLOBAL_Q
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.endif
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;;###########################################################################
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;; No More.
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;;###########################################################################
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