Enable more general BITCAST folding in local morph #84144
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Correctness fixes: 1) The hacky way which contained indirections were handled will not work for targets where address containment has special rules that depends on the type being loaded. 2) Small-typed sources were not handled correctly. 3) Interference checks. This has some regressions attached to it because we now contain locals with optimizations disabled and that can lead to using double stores instead of integer ones when the user is a store itself.
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area-CodeGen-coreclr
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Tagging subscribers to this area: @JulieLeeMSFT, @jakobbotsch, @kunalspathak Issue DetailsAnd fix a few issues with the support already present in lowering, in particular, start containing things under user-produced Regressions:
Fixes #71839.
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Optional: add constant folding for GT_BITCAST in importer (gtFoldConstExpr) |
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I'll let that wait until the support for double<->long bitcasts on 32 bit is added as otherwise importer code is not simplifiable. @dotnet/jit-contrib |
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@SingleAccretion can you resolve conflicts -- sorry it took us so long to look at this one. |
jakobbotsch
approved these changes
Apr 11, 2023
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And fix a few issues with the support already present in lowering, in particular, start containing things under user-produced
BITCASTs.Regressions:
Fixes #71839.