You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
41 lines
1.1 KiB
41 lines
1.1 KiB
/*
|
|
* Copyright 2002-2019 Intel Corporation.
|
|
*
|
|
* This software is provided to you as Sample Source Code as defined in the accompanying
|
|
* End User License Agreement for the Intel(R) Software Development Products ("Agreement")
|
|
* section 1.L.
|
|
*
|
|
* This software and the related documents are provided as is, with no express or implied
|
|
* warranties, other than those that are expressly stated in the License.
|
|
*/
|
|
|
|
#include <asm_macros.h>
|
|
|
|
DECLARE_FUNCTION(bsr_func)
|
|
DECLARE_FUNCTION(bsf_func)
|
|
|
|
.global NAME(bsr_func)
|
|
.global NAME(bsf_func)
|
|
//.intel_syntax noprefix
|
|
|
|
// int bsr_func(int src) - this function returns the bit index of the
|
|
// most significant bit set. in case 'src' is zero, -1 is returned.
|
|
NAME(bsr_func):
|
|
BEGIN_STACK_FRAME
|
|
mov $0, RETURN_REG
|
|
not RETURN_REG
|
|
bsr PARAM1, RETURN_REG
|
|
END_STACK_FRAME
|
|
ret
|
|
|
|
// int bsr_func(int src) - this function returns the bit index of the
|
|
// least significant bit set. in case 'src' is zero, -1 is returned.
|
|
NAME(bsf_func):
|
|
BEGIN_STACK_FRAME
|
|
mov $0, RETURN_REG
|
|
not RETURN_REG
|
|
bsf PARAM1, RETURN_REG
|
|
END_STACK_FRAME
|
|
ret
|
|
|