Changed a couple small parts of the algorithm to reduce time to build
the dominator trees. There should be no visible changes.
Add a depth first search algorithm that does not run a function on
backedges. The check if an edge is a back edge is time consuming, and
pointless if the function run on it is a nop.
Fixes https://crbug.com/oss-fuzz48578
* Adds structural reachability to basic blocks
* calculated in same manner as reachability, but using structural
successors
* Change structured CFG validation to use structural reachability
instead of reachability
* Fix some invalid reducer cases
* ANGLE builds with -Werror,-Wunreachable-code-loop-increment which had
a problem with grabbing the first construct in a loop
* Change the code to just use begin instead
* Structural dominance introduced in SPIR-V 1.6 rev2
* Changes the structured cfg validation to use structural dominance
* structural dominance is based on a cfg where merge and continue
declarations are counted as graph edges
* Basic blocks now track structural predecessors and structural
successors
* Add validation for entry into a loop
* Fixed an issue with inlining a single block loop
* The continue target needs to be moved to the latch block
* Simplify the calculation of structured exits
* no longer requires block depth
* Update many invalid tests
We currently build the structured order for all nodes reachable from the
loop header when unrolling a loop. However, unrolling only needs the
nodes in the loop and possibly the merge node.
To avoid needless computation, I have implemented a search that will
stop at the merge node.
Fixes#4827
A std::set is used instead of std::vector, where the elements are
ordered by member index first. Decorations for fields are now looked up
by going over the range of decorations for the member only, instead of
the whole set.
In an ANGLE test that generates a struct with 4096 members, validation
goes down from ~140ms to ~90ms. On debug builds, the difference is more
pronounced, going down from ~2.5s to ~600ms.
- Add assembler/disassembler support
- Add validator support
Signed-off-by: Kevin Petit <kevin.petit@arm.com>
Change-Id: Iffcedd5d5e636a0e128a5906ffe634dd85727de1
