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When NASM is in BITS 16 mode, instructions which use 32-bit data are prefixed with an 0x66 byte, and those referring to 32-bit addresses have an 0x67 prefix. In The instruction field may contain any machine instruction: Pentium and P6 instructions, FPU instructions, MMX instructions and even undocumented instructionsThis manual documents NASM, the Netwide Assembler: an assembler targetting the Intel x86 series of processors, with portable source. Index · Appendix A: x86 NASM is line-based. Most programs consist of directives followed by one or more sections . Lines can have an optional label . Most lines have an instruction Add support for the Intel AVX2 instruction set. Add support for Bit Manipulation Instructions 1 and 2. Add support for Intel Transactional Synchronization Name, Notes, Type ; rax, Values are returned from functions in this register. scratch ; rcx, Typical scratch register. Some instructions also use it as a counter. This appendix provides a complete list of the machine instructions which NASM will assemble, and a short description of the function of each one. It is not In addition to storing the original value of the bit into the carry flag, BTR also resets (clears) the bit in the operand itself. BTS sets the bit, and BTC Add support for the Intel AVX-512 instruction set: 16 new, 512-bit SIMD registers. Total 32 (ZMM0 ~ ZMM31); 8 new opmask registers (K0 ~ K7) .