JIT: Include more edges in BlockDominancePreds
#110531
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Because of spurious flow it is possible that the preds of the try-begin block are not the only blocks that can dominate a handler. We handled this possibility, but only for finally/fault blocks that can directly have these edges. However, even other handler blocks can be reachable through spurious paths that involves finally/fault blocks, and in these cases returning the preds of the try-begin block is not enough to compute the right dominator statically.
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cc @dotnet/jit-contrib PTAL @AndyAyersMS No codegen diffs. Some TP regressions since we are now spending a lot more effort to compute the dominator of handlers ( |
AndyAyersMS
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Dec 9, 2024
This was referenced Dec 9, 2024
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/backport to release/9.0-staging |
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Started backporting to release/9.0-staging: https://github.com/dotnet/runtime/actions/runs/12254343358 |
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Because of spurious flow it is possible that the preds of the try-begin block are not the only blocks that can dominate a handler. We handled this possibility, but only for finally/fault blocks that can directly have these edges. However, even other handler blocks can be reachable through spurious paths that involves finally/fault blocks, and in these cases returning the preds of the try-begin block is not enough to compute the right dominator statically.
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Because of spurious flow it is possible that the preds of the try-begin
block are not the only blocks that can dominate a handler. We handled
this possibility, but only for finally/fault blocks that can directly
have these edges. However, even other handler blocks can be reachable
through spurious paths that involves finally/fault blocks, and in these
cases returning the preds of the try-begin block is not enough to
compute the right dominator statically.
Fix the problem by considering the dominance preds to be all preds of
handler, in addition to the try-enter blocks.
Fix #109981