147 lines
5.8 KiB
C
147 lines
5.8 KiB
C
/*
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*********************************************************************************************************
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* uC/CPU
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* CPU CONFIGURATION & PORT LAYER
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*
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* Copyright 2004-2021 Silicon Laboratories Inc. www.silabs.com
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*
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* SPDX-License-Identifier: APACHE-2.0
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*
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* This software is subject to an open source license and is distributed by
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* Silicon Laboratories Inc. pursuant to the terms of the Apache License,
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* Version 2.0 available at www.apache.org/licenses/LICENSE-2.0.
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*
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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*
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* CPU PORT FILE
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*
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* ARM
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* IAR C Compiler
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*
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* Filename : cpu_c.c
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* Version : V1.32.01
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* INCLUDE FILES
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*********************************************************************************************************
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*/
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#define MICRIUM_SOURCE
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#include <cpu.h>
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#include <cpu_core.h>
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#include <lib_def.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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*********************************************************************************************************
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* LOCAL DEFINES
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* LOCAL CONSTANTS
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* LOCAL DATA TYPES
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* LOCAL TABLES
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* LOCAL GLOBAL VARIABLES
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* LOCAL FUNCTION PROTOTYPES
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* LOCAL CONFIGURATION ERRORS
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*********************************************************************************************************
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*/
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/*
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*********************************************************************************************************
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* CPU_CntLeadZeros()
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*
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* Description : Counts the number of contiguous, most-significant, leading zero bits before the
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* first binary one bit in a data value.
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*
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* Argument(s) : val Data value to count leading zero bits.
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*
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* Return(s) : Number of contiguous, most-significant, leading zero bits in 'val'.
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*
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* Note(s) : (1) (a) Supports 32-bit data value size as configured by 'CPU_DATA' (see 'cpu.h
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* CPU WORD CONFIGURATION Note #1').
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*
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* (b) For 32-bit values :
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*
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* b31 b30 b29 ... b04 b03 b02 b01 b00 # Leading Zeros
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* --- --- --- --- --- --- --- --- ---------------
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* 1 x x x x x x x 0
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* 0 1 x x x x x x 1
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* 0 0 1 x x x x x 2
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* : : : : : : : : :
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* : : : : : : : : :
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* 0 0 0 1 x x x x 27
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* 0 0 0 0 1 x x x 28
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* 0 0 0 0 0 1 x x 29
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* 0 0 0 0 0 0 1 x 30
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* 0 0 0 0 0 0 0 1 31
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* 0 0 0 0 0 0 0 0 32
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*
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*
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* (2) MUST be defined in 'cpu_a.asm' (or 'cpu_c.c') if CPU_CFG_LEAD_ZEROS_ASM_PRESENT
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* is #define'd in 'cpu_cfg.h' or 'cpu.h'.
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*********************************************************************************************************
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*/
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#ifdef CPU_CFG_LEAD_ZEROS_ASM_PRESENT
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CPU_DATA CPU_CntLeadZeros (CPU_DATA val)
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{
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CPU_DATA cnt = 0u;
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asm("CLZ %0, %1" : "=r"(cnt) : "r" (val));
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return (cnt);
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}
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#endif
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#ifdef __cplusplus
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}
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#endif
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