CMPJcc

Operation

Compares two Rn registers and branches on the selected condition without writing FLAGS.

Assembler Syntax

CMPJcc.{B|W|L|Q}(z) Rn(s), Rn(d), <imm8s>

CMPJcc.{B|W|L|Q}(z) Rn(s), Rn(d), <imm16s>

Privilege

Unprivileged

CMPJcc computes the same temporary compare result as CMP for the selected operand size, evaluates the encoded condition from that temporary result, and branches to the relative target when the condition is true. The computed condition is consumed only by the branch decision; architectural FLAGS are not read or written. Conditions T and F are reserved and are not valid encodings.

2.75in

Encodings

CMPJcc.{B|W|L|Q}(z) Rn(s), Rn(d), <imm8s>

Format: Instruction format for CMPJcc.{B|W|L|Q}(z) Rn(s), Rn(d), <imm8s>

cc — allowed: 0x2..0xf [condition_true_false_reclaimed]

2.75in CMPJcc.{B|W|L|Q}(z) Rn(s), Rn(d), <imm16s>

Format: Instruction format for CMPJcc.{B|W|L|Q}(z) Rn(s), Rn(d), <imm16s>

cc — allowed: 0x2..0xf [condition_true_false_reclaimed]