TZCNT (R16, R16)

Operands

• Operand 1 (w): Register (AX, CX, DX, BX, SP, BP, SI, DI, R8W, R9W, R10W, R11W, R12W, R13W, R14W, R15W)
• Operand 2 (r): Register (AX, CX, DX, BX, SP, BP, SI, DI, R8W, R9W, R10W, R11W, R12W, R13W, R14W, R15W)
• Operand 3 (w, suppressed): Flags (AF: undef, CF: w, OF: undef, PF: undef, SF: undef, ZF: w)

Available performance data

• Alder Lake-P
• Alder Lake-E
• Rocket Lake
• Tiger Lake
• Ice Lake
• Cascade Lake
• Cannon Lake
• Skylake-X
• Coffee Lake
• Kaby Lake
• Skylake
• Broadwell
• Haswell
• Ivy Bridge
• Sandy Bridge
• Westmere
• Nehalem
• AMD Zen 4
• AMD Zen 3
• AMD Zen 2
• AMD Zen+

Alder Lake-P

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1

Alder Lake-E

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Microcode Sequencer (MS): 0

Rocket Lake

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1

Tiger Lake

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1

Ice Lake

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1
• Documentation
• Throughput: 1.0

Cascade Lake

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1

Cannon Lake

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1

Skylake-X

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1
• IACA 2.3
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00
• Number of μops: 1
• Port usage: 1*p1
• IACA 3.0
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 0.98
• Number of μops: 1
• Port usage: 1*p1

Coffee Lake

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1

Kaby Lake

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1

Skylake

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1
• IACA 2.3
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00
• Number of μops: 1
• Port usage: 1*p1
• IACA 3.0
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 0.98
• Number of μops: 1
• Port usage: 1*p1

Broadwell

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1
• IACA 2.2
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00 (with the -no_interiteration flag: 1.00)
• Number of μops: 1
• Port usage: 1*p1
• IACA 2.3
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00
• Number of μops: 1
• Port usage: 1*p1
• IACA 3.0
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 0.98
• Number of μops: 1
• Port usage: 1*p1

Haswell

• Measurements
• Latencies
  • Latency operand 1 → 1: 3
  • Latency operand 1 → 3: 3
  • Latency operand 2 → 1: 3
  • Latency operand 2 → 3: 3
• Throughput
  • Computed from the port usage: 1.00
  • Measured (loop): 1.00
  • Measured (unrolled): 1.00
• Number of μops
  • Executed: 1
  • Retire slots: 1
  • Decoded (MITE): 1
  • Microcode Sequencer (MS): 0
• Port usage: 1*p1
• IACA 2.1
• Latency: 8
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 8.00 (with the -no_interiteration flag: 1.00)
• Number of μops: 2
• Port usage: 1*p1+1*p23
• IACA 2.2
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00 (with the -no_interiteration flag: 1.00)
• Number of μops: 1
• Port usage: 1*p1
• IACA 2.3
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00
• Number of μops: 1
• Port usage: 1*p1
• IACA 3.0
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 0.98
• Number of μops: 1
• Port usage: 1*p1

Ivy Bridge

• IACA 2.2
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00 (with the -no_interiteration flag: 1.00)
• Number of μops: 1
• Port usage: 1*p1
• IACA 2.3
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00
• Number of μops: 1
• Port usage: 1*p1

Sandy Bridge

• IACA 2.2
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00 (with the -no_interiteration flag: 1.00)
• Number of μops: 1
• Port usage: 1*p1
• IACA 2.3
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.00
• Number of μops: 1
• Port usage: 1*p1

Westmere

• IACA 2.2
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.67 (with the -no_interiteration flag: 1.00)
• Number of μops: 1
• Port usage: 1*p1

Nehalem

• IACA 2.2
• Throughput
  • Computed from the port usage: 1.00
  • IACA: 1.67 (with the -no_interiteration flag: 1.00)
• Number of μops: 1
• Port usage: 1*p1

AMD Zen 4

• Measurements
• Latencies
  • Latency operand 1 → 1: 1
  • Latency operand 1 → 3: 1
  • Latency operand 2 → 1: 1
  • Latency operand 2 → 3: 1
• Throughput
  • Measured (loop): 0.25
  • Measured (unrolled): 0.38
• Number of μops
  • Executed: 1

AMD Zen 3

• Measurements
• Latencies
  • Latency operand 1 → 1: 1
  • Latency operand 1 → 3: 1
  • Latency operand 2 → 1: 2
  • Latency operand 2 → 3: 2
• Throughput
  • Measured (loop): 0.50
  • Measured (unrolled): 0.50
• Number of μops
  • Executed: 2
• Documentation
• Latency: 2
• Throughput: 0.50
• Number of μops: 2
• Port usage: ALU

AMD Zen 2

• Measurements
• Latencies
  • Latency operand 1 → 1: 1
  • Latency operand 1 → 3: 1
  • Latency operand 2 → 1: 2
  • Latency operand 2 → 3: 2
• Throughput
  • Measured (loop): 0.50
  • Measured (unrolled): 0.50
• Number of μops
  • Executed: 2
• Documentation
• Latency: 2
• Throughput: 0.25
• Number of μops: 2
• Port usage: ALU

AMD Zen+

• Measurements
• Latencies
  • Latency operand 1 → 1: 1
  • Latency operand 1 → 3: 1
  • Latency operand 2 → 1: 2
  • Latency operand 2 → 3: 2
• Throughput
  • Measured (loop): 0.54
  • Measured (unrolled): 0.50
• Number of μops
  • Executed: 2
• Documentation
• Latency: 2
• Throughput: 0.25
• Number of μops: 2
• Port usage: ALU