a89e26d725
We now maintain a the distinction between the value of the mask passed into a function and the "internal" mask within the function that only accounts for varying control flow within the function. The full mask (the AND of the function mask and the internal mask) must be used for assignments to static and global variables, and reference function parameters. Further, it is the appropriate mask to use for making decisions about varying control flow. However, we can use the internal mask for assignments to variables declared in the current function (including the return value and non-reference parameters to the function). Doing so allows us to catch a few more cases where the internal mask is all on, even if the mask coming into the function wasn't all on, and thence use moves rather than blends for those assignments. (Which in turn can allow additional optimizations to happen.) Fixes issue #23.
============================== Intel(r) SPMD Program Compiler ============================== Welcome to the Intel(r) SPMD Program Compiler (ispc)! ispc is a new compiler for "single program, multiple data" (SPMD) programs. Under the SPMD model, the programmer writes a program that mostly appears to be a regular serial program, though the execution model is actually that a number of program instances execute in parallel on the hardware. ispc compiles a C-based SPMD programming language to run on the SIMD units of CPUs; it frequently provides a a 3x or more speedup on CPUs with 4-wide SSE units, without any of the difficulty of writing intrinsics code. ispc is an open source compiler under the BSD license; see the file LICENSE.txt. ispc supports Windows, Mac, and Linux, with both x86 and x86-64 targets. It currently supports the SSE2, SSE4, and AVX instruction sets. For more information and examples, as well as a wiki and the bug database, see the ispc distribution site, http://ispc.github.com.