x86-64.net

Instruction

Jcc

Jumps to a relative target if a condition on the flags holds, such as JZ when ZF is set or JL when SF differs from OF.

Extensions
Mnemonics
JO, JNO, JB, JC, JNAE, JNB, JNC, JAE, JZ, JE, JNZ, JNE, JBE, JNA, JNBE, JA, JS, JNS, JP, JPE, JNP, JPO, JL, JNGE, JNL, JGE, JLE, JNG, JNLE, JG
Forms
3 (3 Legacy)
Data
Intel XED v2026.08.23

Forms

Every encoding of Jcc that Intel XED knows, one row per XED instruction form (iform). How to read the notation.
InstructionEncodingRequires
Jcc rel8 Jcc_RELBRb70+cc cbBase instruction set
Jcc rel32 64-bit mode only Jcc_RELBRd0F 80+cc cdBase instruction set
Jcc rel16/32 not in 64-bit mode Jcc_RELBRz0F 80+cc cw/cdBase instruction set

CPUID and processors

Each form belongs to an XED ISA set. A form can be used when the processor reports every CPUID bit of one of its ISA set's alternatives.

CPUID requirements and processors of the XED ISA sets above. Alternatives are separated by “or”; processors follow XED’s chip model, which covers AMD processors up to Zen 2.
ISA setCPUIDProcessors in XED
I86

No CPUID bit: part of the base instruction set.

Every x86-64 processor in XED’s model

More General-purpose instructions

All 109 General-purpose instructions

Sources

  1. Intel XED v2026.08.23 (commit 0bcb6237345c): forms, encodings, ISA sets, CPUID bits and chip model.
  2. Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 2 (325383-092, June 2026)
  3. Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 2 (325383-093, September 2026)

The tables are derived from Intel XED, Copyright Intel Corporation, licensed under the Apache License 2.0; x86-64.net converted and reformatted them. The text is our own.