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__builtin_clz

bit scan reverse in c

x86 bit reverse

_bitscanreverse

intel asm bsr

count trailing zeros

Opcode, Instruction, Clocks, Description, Example. 0F BD, bsrw r/m16,r16, 10+3n, Bit scan reverse on r/m word, bsrw %cx,%bx bsrw (%ebx,1),%bx bsrw (%ebx,2),%bx bsrw (%ebx,%ebp,1),%bx. 0F BD, bsrl r/m32,r32, 10+3n, Bit scan reverse on r/m dword, bsrl %ecx,%ebx bsrl (%ebx,2),%ebx bsrl (%ebx,4),%ebx bsrl (%ebx
Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Bit Instructions > Bit Scan Reverse (bsr). IA-32 Assembly Language Reference Manual. Previous: Bit Scan Forward (bsf) · Next: Bit Test (bt)
26 Sep 2010 Technically, no. There's BSR to find the most significant bit that's set, and BSF to find the least significant bit that's set -- but the smallest item either will work on is a 16-bit word.
I think these might be the result of a compiler optimization for more compact code. See "Short BRA Optimization" in the compiler guide. Recent IDA versions disassemble such branches as skip2 (there is also skip1 ) for HC08 and HC12 code. I haven't seen such optimization in ColdFire code before. EDIT: or
BSR - Bit Scan Reverse (386+) Usage: BSR dest,src Modifies flags: ZF Scans source operand for first bit set. Sets ZF if a bit is found set and loads the destination with an index to first set bit. Clears ZF is no bits are found set. BSF scans forward across bit pattern (0-n) while BSR scans in reverse (n-0). Clocks Size Operands
10 Apr 2008 Handbook of Instructions Basic Statistical Returns 1 and 2, 1364 kb. V. BSR-1 - Part B (BSR-1B), 19 kb. I. Basic Statistical Return (BSR) 1 (Part A and Part B), 31 kb. II. Guidelines/Instructions for filling in the BSR-1, 12 kb. III. BSR - 1 - Part A (BSR-1A), 59 kb. VII. Basic Statistiscal Return (BSR) 2, 16 kb. VIII.
Description. Searches the source operand (second operand) for the most significant set bit (1 bit). If a most significant 1 bit is found, its bit index is stored in the destination operand (first operand). The source operand can be a register or a memory location; the destination operand is a register. The bit index is an unsigned
LZCNT is almost identical to the Bit Scan Reverse ( BSR ) instruction, but sets the ZF (if the result is zero) and CF (if the source is zero) flags rather than OF, and produces a defined result (the source operand size in bits) if the source operand is zero.
The BSR command loads data into a bit array one bit at a time. The data is shifted through the array, then unloaded one bit at a time. An example for the use of this instruction might be for tracking bottles through a bottling line where each bottle constitutes a bit.
Opcode Instruction Op/En 64-bit Mode Compat/Leg Mode Description 0F BD /r BSR r16, r/m16 RM Valid Valid Bit scan reverse on r/m16. 0F BD /r BSR r32, r/m32 RM Valid Valid Bit scan reverse on r/m32. REX.W + 0F BD /r BSR r64, r/m64 RM Valid N.E. Bit scan reverse on r/m64. Instruction Operand Encoding Op/En

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