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IA-32 Intel® Architecture Optimization
1-4
SIMD improves the performance of 3D graphics, speech recognition,
image processing, scientific applications and applications that have the
following characteristics:
• inherently parallel
• recurring memory access patterns
• localized recurring operations performed on the data
• data-independent control flow
SIMD floating-point instructions fully support the IEEE Standard 754
for Binary Floating-Point Arithmetic. They are accessible from all
IA-32 execution modes: protected mode, real address mode, and Virtual
8086 mode.
SSE, SSE2, and MMX technologies are architectural extensions in the
IA-32 Intel architecture. Existing software will continue to run
correctly, without modification on IA-32 microprocessors that
incorporate these technologies. Existing software will also run correctly
in the presence of applications that incorporate SIMD technologies.
Figure 1-2 SIMD Instruction Register Usage
MM7
MM6
MM7
MM3
MM2
MM1
MM0
MM5
MM4
MM7
XMM6
XMM7
XMM3
XMM2
XMM1
XMM0
XMM5
XMM4
64-bit MMX Registers
128-bit XMM Registers
OM15149