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The VEX prefix replaces the most commonly used instruction prefix bytes and escape bytes. In many cases, the number of prefix bytes and escape bytes that are replaced is the same as the number of bytes in the VEX prefix, so that the total length of the VEX-encoded instruction is the same as the length of the legacy instruction code.
The EVEX prefix retains fields introduced in the VEX prefix: Four bits R̅, X̅, B̅ and W from the VEX prefix, stored in inverted form. W expands the operand size to 64 bits or serves as an additional opcode, R expands reg, B expands r/m or reg, and X and B expand index and base in the SIB byte. Four bits named v̅, stored in inverted form.
AVX-512 Vector Length Extensions (VL) – extends most AVX-512 operations to also operate on XMM (128-bit) and YMM (256-bit) registers (including XMM16-XMM31 and YMM16-YMM31 in x86-64 mode) [25] AVX-512 Byte and Word Instructions (BW) – extends AVX-512 to cover 8-bit and 16-bit integer operations [25]
The VEX prefix used by AVX and AVX2, while flexible, did not leave enough room for the features Intel wanted to add to AVX-512. This has led them to define a new prefix called EVEX. Compared to VEX, EVEX adds the following benefits: [7] Expanded register encoding allowing 32 512-bit registers.
If anything the prefixes KB, MB, GB etc in powers of two need to be shown first in the table and the IEC prefixes moved to a separate table because that reflects real world consensus. And it's not "legacy use" it's more like "common use" and actually "standard use" since the terms are defined by the JEDEC. Fnag aton 11:27, 27 January 2008 (UTC)
For each byte-lane, the byte in src3 is used to index into this 32-byte vector and transform the element: bits 4:0 is used to pick one of the 32 bytes. bits 7:6 specify a transform to perform on the byte (0=keep, 1=bitreverse, 2=set-to-zero, 3=replicate-MSB)
The XOP instructions have an opcode byte 8F (hexadecimal), but otherwise almost identical coding scheme as AVX with the 3-byte VEX prefix. Commentators [4] have seen this as evidence that Intel has not allowed AMD to use any part of the large VEX coding space. AMD has been forced to use different codes in order to avoid using any code ...
Commonly, a decimal SI metric prefix (such as kilo-) is used with bit and byte to express larger sizes (kilobit, kilobyte). But, this is usually inaccurate since these prefixes are decimal, whereas binary hardware size is usually binary. Customarily, each metric prefix, 1000 n, is used to mean a close approximation of a binary multiple, 1024 n ...
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