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lzcnt vs bsr

lzcnt intrinsic

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pdep instruction

bit manipulation instructions in assembly language

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tzcnt

bit manipulation instructions in 8086




Most BMI1 instructions (except LZCNT and TZCNT) employ the VEX prefix encoding to support up to three-operand syntax with non-destructive source operands on 32- or 64-bit general-purpose registers. BMI1 (ANDN, BEXTR, BLSI, BLSMK, BLSR, TZCNT) requires bit 3 set in EBX of CPUID with EAX=07H, ECX=0H.
SSE4.2 includes five String and Text New Instructions (STTNI) working on 128-bit XMM SIMD as well as general prupose registers and flags to perform character searches and comparison on two operands of 16 bytes at a time , i.e. PCMPESTRI (Packed Compare Explicit Length Strings, Return Index).
Intel considers POPCNT as part of SSE4.2, and LZCNT as part of BMI1. 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 .. The fact that intel is the term for intelligence information made the name appropriate.
Opcode/Instruction, Op/En, 64/32 -bit Mode, CPUID Feature Flag, Description. F3 0F BD /r. LZCNT r16, r/m16. RM, V/V, LZCNT, Count the number of leading zero bits in r/m16, return result in r16. F3 0F BD /r. LZCNT r32, r/m32. RM, V/V, LZCNT, Count the number of leading zero bits in r/m32, return result in r32. REX.W + F3
2 Mar 2017 32 KB, Assoc 8, LineSize 64 --**------------ Instruction Cache 1, Level 1, 64 KB, Assoc 4, LineSize 64 --**------------ Unified Cache 2, Level 2, 512 KB, Assoc 8, LineSize 64 ----**---------- Data Cache 2, Level 1, 32 KB, Assoc 8, LineSize 64 ----**---------- Instruction Cache 2, Level 1, 64 KB, Assoc 4, LineSize 64
2010. marc. 24. Extra Features Asus Intelligence, JumperFree, Stepless Freq Selection CPU Properties: HTT / CMP Units 2 / 1. Instruction Set: 64-bit x86 Extension (AMD64, Intel64) Supported AMD 3DNow! Not Supported AMD 3DNow! Professional Not Supported LZCNT Instruction Not Supported MONITOR / MWAIT
ABM is only implemented as a single instruction set by AMD; all AMD processors support both instructions or neither. Intel considers POPCNT as part of SSE4.2, and LZCNT as part of BMI1. POPCNT has a separate CPUID flag; however, Intel uses AMD's ABM flag to indicate LZCNT support (since LZCNT completes the
Beside 64-bit general purpose extensions, x86-64 supports MMX-, x87- as well as the 128-bit SSE- and SSE2-instruction sets. According to the CPUID-instructions, further SIMD Streamig Extensions, such as SSE3, SSSE3 (Intel only), SSE4 (Core2, K10), AVX, AVX2 and AVX-512, and AMD's 3DNow!, Enhanced 3DNow!
5 Sep 2014 To be clear, there is no working fallback from lzcnt to bsr . What happened is that Intel used the previously redundant sequence rep bsr to encode the new lzcnt instruction. Using a redudant rep prefix for bsr was generally defined to be ignored, but with the caveat that it may decode differently on future
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