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[crypto] Use architecture-independent bigint_is_set()

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Every architecture uses the same implementation for bigint_is_set(),
and there is no reason to suspect that a future CPU architecture will
provide a more efficient way to implement this operation.

Simplify the code by providing a single architecture-independent
implementation of bigint_is_set().

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2024-10-08 11:52:07 +01:00
parent 7e0bf4ec5c
commit f78c5a763c
6 changed files with 19 additions and 95 deletions
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19
src/include/ipxe/bigint.h
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@@ -285,6 +285,25 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <bits/bigint.h>
/**
* Test if bit is set in big integer
*
* @v value0 Element 0 of big integer
* @v size Number of elements
* @v bit Bit to test
* @ret is_set Bit is set
*/
static inline __attribute__ (( always_inline )) int
bigint_bit_is_set_raw ( const bigint_element_t *value0, unsigned int size,
unsigned int bit ) {
const bigint_t ( size ) __attribute__ (( may_alias )) *value =
( ( const void * ) value0 );
unsigned int index = ( bit / ( 8 * sizeof ( value->element[0] ) ) );
unsigned int subindex = ( bit % ( 8 * sizeof ( value->element[0] ) ) );
return ( !! ( value->element[index] & ( 1UL << subindex ) ) );
}
void bigint_init_raw ( bigint_element_t *value0, unsigned int size,
const void *data, size_t len );
void bigint_done_raw ( const bigint_element_t *value0, unsigned int size,