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math: Optimize the implementation of log2ceil and log2floor

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and move common math funtions to math32.h:
div_round_up
div_round_closest
is_power_of_2
roundup_pow_of_two
rounddown_pow_of_two

Signed-off-by: lipengfei28 <lipengfei28@xiaomi.com>
This commit is contained in:
lipengfei28
2024-06-21 15:47:59 +08:00
committed by Alin Jerpelea
parent 4fd78583f7
commit ca39dc2e74
11 changed files with 90 additions and 192 deletions
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libs/libc/misc/CMakeLists.txt
-4
View File
@@ -86,10 +86,6 @@ list(
lib_err.c
lib_instrument.c)
# Add generic integer math functions
list(APPEND SRCS lib_log2ceil.c lib_log2floor.c)
# Keyboard driver encoder/decoder
if(CONFIG_LIBC_KBDCODEC)
libs/libc/misc/Make.defs
-4
View File
@@ -43,10 +43,6 @@ CSRCS += lib_crc64.c lib_crc32.c lib_crc16.c lib_crc16ccitt.c lib_crc8.c
CSRCS += lib_crc8ccitt.c lib_crc8table.c lib_glob.c lib_execinfo.c
CSRCS += lib_ftok.c lib_err.c lib_instrument.c
# Add generic integer math functions
CSRCS += lib_log2ceil.c lib_log2floor.c
# Keyboard driver encoder/decoder
ifeq ($(CONFIG_LIBC_KBDCODEC),y)
libs/libc/misc/lib_log2ceil.c
-55
View File
@@ -1,55 +0,0 @@
/****************************************************************************
* libs/libc/misc/lib_log2ceil.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/lib/math32.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: log2ceil
*
* Description:
* Calculate the up-rounded power-of-two for input.
*
* Input Parameters:
* x - Argument to calculate the power-of-two from.
*
* Returned Value:
* Power-of-two for argument, rounded up.
*
****************************************************************************/
uintptr_t log2ceil(uintptr_t x)
{
uintptr_t pot = 0;
for (x = x - 1; x; x >>= 1)
{
pot++;
}
return pot;
}
libs/libc/misc/lib_log2floor.c
-55
View File
@@ -1,55 +0,0 @@
/****************************************************************************
* libs/libc/misc/lib_log2floor.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/lib/math32.h>
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: log2floor
*
* Description:
* Calculate the down-rounded (truncated) power-of-two for input.
*
* Input Parameters:
* x - Argument to calculate the power-of-two from.
*
* Returned Value:
* Power-of-two for argument, rounded (truncated) down.
*
****************************************************************************/
uintptr_t log2floor(uintptr_t x)
{
uintptr_t pot = 0;
for (; x > 1; x >>= 1)
{
pot++;
}
return pot;
}