JIT: Allow BBJ_COND false target to diverge from bbNext in layout optimization phase #96609
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch Issue DetailsNext step for #93020. Working backwards through the JIT flowgraph phases, this change allows
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AndyAyersMS
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…imization phase (dotnet#96609) Next step for dotnet#93020. Working backwards through the JIT flowgraph phases, this change allows bbFalseTarget to diverge from bbNext in Compiler::optOptimizeLayout and onwards.
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…yout optimization phase (dotnet#96609)" This reverts commit 5598dac.
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Part of #93020. This change adds back in most of #97191 and #96609, except for any significant changes to the flowgraph optimization passes to reduce churn. With this change, the false target of a BBJ_COND can diverge from the next block until Compiler::optOptimizeLayout, in which we reestablish implicit fall-through with fgConnectFallThrough to preserve the existing block reordering behavior. Note that the deferral of these fall-through fixups causes diffs in the edge weights, which can alter the behavior of fgReorderBlocks, hence some of the size regressions
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Next step for #93020. Working backwards through the JIT flowgraph phases, this change allows
bbFalseTargetto diverge frombbNextinCompiler::optOptimizeLayoutand onwards. This requires some awkward quirking (most of which should be short-lived, while some quirks may stay until we change our block reordering approach), asfgReorderBlocksandfgUpdateFlowGraphPhaseare also called in a few earlier phases.