Martin Reinecke <[EMAIL PROTECTED]> writes: > I'm trying to learn about GCC's support for vector arithmetic and found > the section "Using vector instructions through built-in functions", which > answers a lot of questions, but unfortunately does not address things > like gathering scalar values into a vector type or reading scalars > out of such a variable, which I think is quite important for everyone > who wants to use this nice extension.
At present it has to be done through a union type: a union of the vector type and an array of the appropriate length and element type. > More X86-specific, the section "X86 Built-in Functions" documents > builtins for MMX, 3DNow, SSE, SSE3, but appears to omit the vector > intrinsics for SSE2 like, e.g., __builtin_ia32_sqrtpd(). The x86 built-in functions is now completely out of date. The preferred approach now is to use the Intel documented intrinsics functions declared in mmintrin.h and friends. Ian
