Developer Guide and Reference


Writing Programs with Intel® Streaming SIMD Extensions (Intel® SSE) Intrinsics

You should be familiar with the hardware features provided by Intel® Streaming SIMD Extensions (Intel® SSE) when writing programs with the intrinsics. The following are four important issues to keep in mind:
  • Certain intrinsics, such as
    , are not directly supported by the instruction set. While these intrinsics are convenient programming aids, be mindful that they may consist of more than one machine-language instruction.
  • Floating-point data loaded or stored as
    objects must be generally 16-byte-aligned.
  • Some intrinsics require that their argument be immediates, that is, constant integers (literals), due to the nature of the instruction.
  • The result of arithmetic operations acting on two
    (Not a Number) arguments is undefined. Therefore, FP operations using
    arguments will not match the expected behavior of the corresponding assembly instructions.

Product and Performance Information


Intel's compilers may or may not optimize to the same degree