x86-64.net

AVX

avx-type-8 exception class

VZEROALL and VZEROUPPER, which clear vector registers and take no operands, the class that Intel's manual calls Exceptions Type 8.

Class
avx-type-8 in Intel XED
Applies to
The VEX encodings of VZEROALL and VZEROUPPER.
Instructions
2 mnemonics, 2 forms
Data
Intel XED v2026.08.23

Exception conditions

When an instruction of the class raises each exception, and in which processor modes. Protected mode includes compatibility mode. How to read the table.
ExceptionRealVirtual-8086Protected64-bitCondition
#UDAlways.
#UDThe operating system has not enabled the AVX state: CR4.OSXSAVE is 0, or XCR0 bits 1 and 2 (SSE and AVX state) are not both 1.
#UDThe processor lacks AVX: CPUID.01H:ECX.AVX[bit 28] is 0.
#UDVEX.vvvv is not 1111b.
#UDThe instruction has a LOCK prefix (F0).
#NMCR0.TS (task switched, bit 3) is 1.

Notes

Without operands, the instructions can only raise #UD and #NM.

  • avx-type-7: VEX-encoded instructions without a memory operand or floating-point exceptions, such as VMOVMSKPS, VPSRLDQ and the shifts by an immediate count, which Intel's manual calls Exceptions Type 7.

Instructions

Intel XED puts forms of 2 mnemonics in this class, listed here by extension. Where a mnemonic also has forms of other classes, its link leads to its first form of this one.

AVX

Sources

  1. Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 2 (325383-093, September 2026): Section 2.5.8, Table 2-25; Section 2.5, Tables 2-14 and 2-15.
  2. Intel XED v2026.08.23 (commit 0bcb6237345c): the exception class of each instruction form.

The list of instructions is derived from Intel XED, Copyright Intel Corporation, licensed under the Apache License 2.0; x86-64.net converted and reformatted it. The text is our own.