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The 128-bit XMM registers are XMM0 through XMM7. The contents of memory are found at the address provided by the effective address computation. INSTRUCTION SET REFERENCE • xmm/m128—An XMM register or a 128-bit memory operand. The 128-bit XMM registers are XMM0 through XMM7. The contents of memory are found at the address provided by the effective address computation. 3. DESCRIPTION COLUMN The “Description” column following the “Instruction” column briefly explains the various forms of the instruction.

The compiler aligns __m128, __m128d, and __m128i local data to 16-byte boundaries on the stack. Global __m128 data is also aligned on 16-byte boundaries. ) Because the new instruction set treats the SIMD floating-point registers in the same way whether you are using packed or scalar data, there is no __m32 data type to represent scalar data as you might expect. For scalar operations, you should use the __m128 objects and the “scalar” forms of the intrinsics; the compiler and the processor implement these operations with 32-bit memory references.

If the result is less than –128, it is represented by the saturated value –128 (80H); if it is greater than 127, it is represented by the saturated value 127 (7FH). • SaturateToSignedWord—Represents the result of an operation as a signed 16-bit value. If the result is less than –32768, it is represented by the saturated value –32768 (8000H); if it is greater than 32767, it is represented by the saturated value 32767 (7FFFH). • SaturateToUnsignedByte—Represents the result of an operation as a signed 8-bit value.

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