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| author | Michael Brown | 2014-04-27 17:11:44 +0200 |
|---|---|---|
| committer | Michael Brown | 2014-04-27 17:56:09 +0200 |
| commit | d36e814b8aad0dc15386180245efb3f5cb8b8386 (patch) | |
| tree | 9c3c633f01a1703a8c85524a4393f8f45539f459 /src/arch/x86/include | |
| parent | [libc] Add isqrt() function to find integer square roots (diff) | |
| download | ipxe-d36e814b8aad0dc15386180245efb3f5cb8b8386.tar.gz ipxe-d36e814b8aad0dc15386180245efb3f5cb8b8386.tar.xz ipxe-d36e814b8aad0dc15386180245efb3f5cb8b8386.zip | |
[libc] Add flsll()
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/arch/x86/include')
| -rw-r--r-- | src/arch/x86/include/bits/strings.h | 31 |
1 files changed, 0 insertions, 31 deletions
diff --git a/src/arch/x86/include/bits/strings.h b/src/arch/x86/include/bits/strings.h deleted file mode 100644 index 62e0fbfba..000000000 --- a/src/arch/x86/include/bits/strings.h +++ /dev/null @@ -1,31 +0,0 @@ -#ifndef _BITS_STRINGS_H -#define _BITS_STRINGS_H - -FILE_LICENCE ( GPL2_OR_LATER ); - -/** - * 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=1 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__ ( "bsr %1, %0" - : "=r" ( msb_minus_one ) - : "rm" ( value ) ); - return ( msb_minus_one + 1 ); - } else { - return 0; - } -} - -#endif /* _BITS_STRINGS_H */ |