JIT: Fix some cases using BasicBlock::bbFallsThrough
#97699
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`bbFallsThrough` still returns true for `BBJ_COND`; we have a couple of places using it as a "control flows from prev block" check, which is wrong after dotnet#97488.
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch Issue Details
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jakobbotsch
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Jan 30, 2024
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| assertionsOut = pred->bbAssertionOut; | ||
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Small drive-by fix for some UB here (in the useCondAssertions case we were accessing an inactive union member).
Diff results for #97699Assembly diffsAssembly diffs for osx/arm64 ran on linux/x64Diffs are based on 2,270,861 contexts (932,669 MinOpts, 1,338,192 FullOpts). MISSED contexts: base: 1 (0.00%), diff: 9 (0.00%) Overall (+684 bytes)
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Assembly diffs for windows/arm64 ran on linux/x64Diffs are based on 2,341,109 contexts (938,449 MinOpts, 1,402,660 FullOpts). MISSED contexts: base: 0 (0.00%), diff: 8 (0.00%) Overall (+668 bytes)
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Assembly diffs for windows/x64 ran on linux/x64Diffs are based on 2,512,204 contexts (997,391 MinOpts, 1,514,813 FullOpts). MISSED contexts: base: 0 (0.00%), diff: 8 (0.00%) Overall (+630 bytes)
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Details here Throughput diffsThroughput diffs for osx/arm64 ran on windows/x64Overall (-0.01% to +0.00%)
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Throughput diffs for windows/arm64 ran on windows/x64Overall (-0.01% to +0.00%)
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Diff results for #97699Assembly diffsAssembly diffs for linux/arm ran on windows/x86Diffs are based on 2,239,391 contexts (829,328 MinOpts, 1,410,063 FullOpts). MISSED contexts: 71,273 (3.08%) Overall (+52 bytes)
FullOpts (+52 bytes)
Assembly diffs for windows/x86 ran on windows/x86Diffs are based on 2,293,495 contexts (839,658 MinOpts, 1,453,837 FullOpts). MISSED contexts: 1 (0.00%) Overall (+46 bytes)
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Details here Assembly diffs for linux/arm64 ran on windows/x64Diffs are based on 2,507,310 contexts (1,007,092 MinOpts, 1,500,218 FullOpts). MISSED contexts: base: 0 (0.00%), diff: 8 (0.00%) Overall (+584 bytes)
FullOpts (+584 bytes)
Assembly diffs for linux/x64 ran on windows/x64Diffs are based on 2,517,901 contexts (991,070 MinOpts, 1,526,831 FullOpts). MISSED contexts: base: 0 (0.00%), diff: 8 (0.00%) Overall (+567 bytes)
FullOpts (+567 bytes)
Details here Throughput diffsThroughput diffs for linux/arm64 ran on linux/x64Overall (-0.01% to -0.00%)
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cc @dotnet/jit-contrib PTAL @amanasifkhalid Diffs. A few cases where we now recognize an induction due to |
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amanasifkhalid
approved these changes
Jan 30, 2024
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Thanks for the fix!
My hope is that we can get rid of |
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bbFallsThroughstill returns true forBBJ_COND; we have a couple of places using it as a "control flows from prev block" check, which is wrong after #97488.Should fix the test failures I'm seeing over in #97182.