This is a collection of Intel®’ IA32® Software Developer's Manuals (URL of the day) and AMD' AMD64 Architecture Programmer's Manual together with the related specifications, application notes, white papers, and change logs. The collection aims to keep all available revisions. It was originally created by Michal Necasek, see OS/2 Museum.

If you have a public document, related to the IA32® specifications and missing from the collection, please mail it to me. The content of this URL and all sub-ULRs is available for convenient bulk download by rsync x86docs password "" (empty).

CBZ

Compare and branch on zero

This instruction compares the value in a register with zero, and conditionally branches to a label at a PC-relative offset if the comparison is equal. This instruction provides a hint that this is not a subroutine call or return. This instruction does not affect condition flags.

Decode for all variants of this encoding

let t : integer = UInt(Rt); let datasize : integer{} = 32 << UInt(sf); let offset : bits(64) = SignExtend{}(imm19::'00');