For example, an SSE instruction using the conventional two-operand form a ← a + b can now use a non-destructive three-operand form c ← a + b, preserving both source operands. The legacy SSE instructions can be still utilized via the VEX prefix to operate on the lower 128 bits of the YMM registers.ĪVX-512 register scheme as extension from the AVX (YMM0-YMM15) and SSE (XMM0-XMM15) registersĪVX introduces a three-operand SIMD instruction format called VEX coding scheme, where the destination register is distinct from the two source operands. ![]() The width of the SIMD registers is increased from 128 bits to 256 bits, and renamed from XMM0–XMM7 to YMM0–YMM7 (in x86-64 mode, from XMM0–XMM15 to YMM0–YMM15).
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