On KNC, the various vector comparison instructions can optionally
be masked; if a mask is provided, the result is effectively that
the value returned is the AND of the mask with the result of the
comparison.
This change adds an optimization pass to the C++ backend that looks
for vector ANDs where one operand is a comparison and rewrites
them--e.g. "__and(__equal_float(a, b), c)" is changed to
"__equal_float_and_mask(a, b, c)", saving an instruction in the end.
Issue #319.
e.g. "__equal()" -> "__equal_float()", etc.
No functional change; this is necessary groundwork for a forthcoming
peephole optimization that eliminates ANDs of masks in some cases.
Fixes to __load and __store.
Added __add, __mul, __equal, __not_equal, __extract_elements, __smear_i64, __cast_sext, __cast_zext,
and __scatter_base_offsets32_float.
__rcp_varying_float now has a fast-math and full-precision implementation.
