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[libc] Add ffs(), ffsl(), and ffsll()

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-03-15 19:28:05 +00:00
parent 57bab4e1d3
commit 79697c75ee
4 changed files with 233 additions and 6 deletions
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74
src/tests/math_test.c
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@@ -38,6 +38,26 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/test.h>
#include <ipxe/isqrt.h>
/**
* Force a call to the non-constant implementation of ffsl()
*
* @v value Value
* @ret lsb Least significant bit set in value (LSB=1), or zero
*/
__attribute__ (( noinline )) int ffsl_var ( long value ) {
return ffsl ( value );
}
/**
* Force a call to the non-constant implementation of ffsll()
*
* @v value Value
* @ret lsb Least significant bit set in value (LSB=1), or zero
*/
__attribute__ (( noinline )) int ffsll_var ( long long value ) {
return ffsll ( value );
}
/**
* Force a call to the non-constant implementation of flsl()
*
@@ -176,6 +196,44 @@ __attribute__ (( noinline )) int64_t s64mod_var ( int64_t dividend,
return check_divmod ( dividend, divisor, % );
}
/**
* Report a ffsl() test result
*
* @v value Value
* @v lsb Expected LSB
* @v file Test code file
* @v line Test code line
*/
static inline __attribute__ (( always_inline )) void
ffsl_okx ( long value, int lsb, const char *file, unsigned int line ) {
/* Verify as a constant (requires to be inlined) */
okx ( ffsl ( value ) == lsb, file, line );
/* Verify as a non-constant */
okx ( ffsl_var ( value ) == lsb, file, line );
}
#define ffsl_ok( value, lsb ) ffsl_okx ( value, lsb, __FILE__, __LINE__ )
/**
* Report a ffsll() test result
*
* @v value Value
* @v lsb Expected LSB
* @v file Test code file
* @v line Test code line
*/
static inline __attribute__ (( always_inline )) void
ffsll_okx ( long long value, int lsb, const char *file, unsigned int line ) {
/* Verify as a constant (requires to be inlined) */
okx ( ffsll ( value ) == lsb, file, line );
/* Verify as a non-constant */
okx ( ffsll_var ( value ) == lsb, file, line );
}
#define ffsll_ok( value, lsb ) ffsll_okx ( value, lsb, __FILE__, __LINE__ )
/**
* Report a flsl() test result
*
@@ -274,6 +332,22 @@ static void s64divmod_okx ( int64_t dividend, int64_t divisor,
*/
static void math_test_exec ( void ) {
/* Test ffsl() */
ffsl_ok ( 0, 0 );
ffsl_ok ( 1, 1 );
ffsl_ok ( 255, 1 );
ffsl_ok ( 256, 9 );
ffsl_ok ( 257, 1 );
ffsl_ok ( 0x54850596, 2 );
ffsl_ok ( 0x80000000, 32 );
/* Test ffsll() */
ffsll_ok ( 0, 0 );
ffsll_ok ( 1, 1 );
ffsll_ok ( 0x6d63623330ULL, 5 );
ffsll_ok ( 0x80000000UL, 32 );
ffsll_ok ( 0x8000000000000000ULL, 64 );
/* Test flsl() */
flsl_ok ( 0, 0 );
flsl_ok ( 1, 1 );