On 4/4/2016 2:11 PM, jmh530 wrote:
version(D_SIMD) will tell you when SIMD is implemented, but not what type of SIMD.
The first SIMD level.
For instance, if I am on a machine that can use AVX2 instructions, then code in a version(D_SIMD) block will execute, but it should also execute if the processor only supports SSE4. What if the writer of an SIMD library wants to have code execute differently if SSE4 is detected instead of AVX2?
Use a runtime switch (see core.cpuid).
