080dc24383
Add flag -fassume-phsa that is on by default. If -fno-assume-phsa is given, these optimizations are disabled. With this flag, gccbrig can generate GENERIC that assumes we are targeting a phsa-runtime based implementation, which allows us to expose the work-item context accesses to retrieve WI IDs etc. which helps optimizers. First optimization that takes advantage of this is to get rid of the setworkitemid calls whenever we have non-inlined calls that use IDs internally. Other optimizations added in this commit: - expand absoluteid to similar level of simplicity as workitemid. At the moment absoluteid is the best indexing ID to end up with WG vectorization. - propagate ID variables closer to their uses. This is mainly to avoid known useless casts, which confuse at least scalar evolution analysis. - use signed long long for storing IDs. Unsigned integers have defined wraparound semantics, which confuse at least scalar evolution analysis, leading to unvectorizable WI loops. - also refactor some BRIG function generation helpers to brig_function. - no point in having the wi-loop as a for-loop. It's really a do...while and SCEV can analyze it just fine still. - add consts to ptrs etc. in BRIG builtin defs. Improves optimization opportunities. - add qualifiers to generated function parameters. Const and restrict on the hidden local/private pointers, the arg buffer and the context pointer help some optimizations. From-SVN: r259957 |
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| .. | ||
| arithmetic.c | ||
| atomics.c | ||
| bitstring.c | ||
| fbarrier.c | ||
| fibers.c | ||
| fp16.c | ||
| misc.c | ||
| multimedia.c | ||
| queue.c | ||
| sat_arithmetic.c | ||
| segment.c | ||
| workitems.c | ||