JIT: Create side effect commas as TYP_VOID in block morph #85320
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This code could create IR shapes like
COMMA struct
...
ASG struct
dst
src
After liveness that would sometimes result in
COMMA struct
...
NOP void
which could confuse optimization phases when JitOptRepeat was enabled.
The more canonical shape for these side-effecting GT_COMMA nodes has
them TYP_VOID typed as shown by gtExtractSideEffList, so do the same in
block morph.
Fix dotnet#85037
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch Issue DetailsThis code could create IR shapes like COMMA struct which could confuse optimization phases when JitOptRepeat was enabled. The more canonical shape for these side-effecting GT_COMMA nodes has them TYP_VOID typed as shown by gtExtractSideEffList, so do the same in block morph. Fix #85037 There are still other cases where we produce the non-canonical typed commas, e.g.
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cc @dotnet/jit-contrib PTAL @EgorBo |
EgorBo
approved these changes
Apr 25, 2023
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This code could create IR shapes like
After liveness that would sometimes result in
which could confuse optimization phases when JitOptRepeat was enabled.
The more canonical shape for these side-effecting GT_COMMA nodes has them TYP_VOID typed as shown by gtExtractSideEffList, so do the same in block morph.
Fix #85037
There are still other cases where we produce the non-canonical typed commas, e.g.
impAssignStruct. I started trying to fix it but it looks like it will take a larger clean up.