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;//
;//
;// File Name: armVCCOMM_s.h
;// OpenMAX DL: v1.0.2
;// Revision: 12290
;// Date: Wednesday, April 9, 2008
;//
;// (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
;//
;//
;//
;// ARM optimized OpenMAX AC header file
;//
;// Formula used:
;// MACRO for calculating median for three values.
IF :LNOT::DEF:ARMVCCOMM_S_H
INCLUDE armCOMM_s.h
M_VARIANTS CortexA8, ARM1136JS
IF ARM1136JS :LOR: CortexA8
;///*
;// * Macro: M_MEDIAN3
;// *
;// * Description: Finds the median of three numbers
;// *
;// * Remarks:
;// *
;// * Parameters:
;// * [in] x First entry for the list of three numbers.
;// * [in] y Second entry for the list of three numbers.
;// * Input value may be corrupted at the end of
;// * the execution of this macro.
;// * [in] z Third entry of the list of three numbers.
;// * Input value corrupted at the end of the
;// * execution of this macro.
;// * [in] t Temporary scratch register.
;// * [out]z Median of the three numbers.
;// */
MACRO
M_MEDIAN3 $x, $y, $z, $t
SUBS $t, $y, $z; // if (y < z)
ADDLT $z, $z, $t; // swap y and z
SUBLT $y, $y, $t;
;// Now z' <= y', so there are three cases for the
;// median value, depending on x.
;// 1) x <= z' <= y' : median value is z'
;// 2) z' <= x <= y' : median value is x
;// 3) z' <= y' <= x : median value is y'
CMP $z, $x; // if ( x > min(y,z) )
MOVLT $z, $x; // ans = x
CMP $x, $y; // if ( x > max(y,z) )
MOVGT $z, $y; // ans = max(y,z)
MEND
ENDIF
ENDIF ;// ARMACCOMM_S_H
END
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