diff options
Diffstat (limited to 'qemu/roms/ipxe/src/arch/i386/include/bits/strings.h')
-rw-r--r-- | qemu/roms/ipxe/src/arch/i386/include/bits/strings.h | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/qemu/roms/ipxe/src/arch/i386/include/bits/strings.h b/qemu/roms/ipxe/src/arch/i386/include/bits/strings.h deleted file mode 100644 index 453545f00..000000000 --- a/qemu/roms/ipxe/src/arch/i386/include/bits/strings.h +++ /dev/null @@ -1,94 +0,0 @@ -#ifndef _BITS_STRINGS_H -#define _BITS_STRINGS_H - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -/** - * Find first (i.e. least significant) set bit - * - * @v value Value - * @ret lsb Least significant bit set in value (LSB=1), or zero - */ -static inline __attribute__ (( always_inline )) int __ffsl ( long value ) { - long lsb_minus_one; - - /* If the input value is zero, the BSF instruction returns - * ZF=0 and leaves an undefined value in the output register. - * Perform this check in C rather than asm so that it can be - * omitted in cases where the compiler is able to prove that - * the input is non-zero. - */ - if ( value ) { - __asm__ ( "bsfl %1, %0" - : "=r" ( lsb_minus_one ) - : "rm" ( value ) ); - return ( lsb_minus_one + 1 ); - } else { - return 0; - } -} - -/** - * Find first (i.e. least significant) set bit - * - * @v value Value - * @ret lsb Least significant bit set in value (LSB=1), or zero - */ -static inline __attribute__ (( always_inline )) int __ffsll ( long long value ){ - unsigned long high = ( value >> 32 ); - unsigned long low = ( value >> 0 ); - - if ( low ) { - return ( __ffsl ( low ) ); - } else if ( high ) { - return ( 32 + __ffsl ( high ) ); - } else { - return 0; - } -} - -/** - * Find last (i.e. most significant) set bit - * - * @v value Value - * @ret msb Most significant bit set in value (LSB=1), or zero - */ -static inline __attribute__ (( always_inline )) int __flsl ( long value ) { - long msb_minus_one; - - /* If the input value is zero, the BSR instruction returns - * ZF=0 and leaves an undefined value in the output register. - * Perform this check in C rather than asm so that it can be - * omitted in cases where the compiler is able to prove that - * the input is non-zero. - */ - if ( value ) { - __asm__ ( "bsrl %1, %0" - : "=r" ( msb_minus_one ) - : "rm" ( value ) ); - return ( msb_minus_one + 1 ); - } else { - return 0; - } -} - -/** - * Find last (i.e. most significant) set bit - * - * @v value Value - * @ret msb Most significant bit set in value (LSB=1), or zero - */ -static inline __attribute__ (( always_inline )) int __flsll ( long long value ){ - unsigned long high = ( value >> 32 ); - unsigned long low = ( value >> 0 ); - - if ( high ) { - return ( 32 + __flsl ( high ) ); - } else if ( low ) { - return ( __flsl ( low ) ); - } else { - return 0; - } -} - -#endif /* _BITS_STRINGS_H */ |