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Don't assert that an eqq is followed by another instruction - #9830
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canOmitStoreLoad asserted that the instruction after an eqq is never null, but it's null whenever the eqq ends its basic block. Inside a block, each in clause of a case/in does that, because the pattern_end label after the eqq starts a new basic block. With assertions on, those blocks failed to compile. The assertion wasn't protecting anything: a null next instruction just means the store and load can't be omitted, which is what the method returns for patterns anyway. Return false instead. Fixes jruby#9829
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This was likely a valid assertion to make before the advent of patterns, which do some pretty horrendous things under the covers. Hopefully we'll be able to make some improvements to how patterns compile soon.
Trivial fix since the assertion is no longer needed with pattern compilation.
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Fixes #9829.
With Java assertions on, a block containing a
case/inwith more than oneinclause couldn't be JIT-compiled, becausecanOmitStoreLoadasserts that aneqqis never the last instruction in its basic block. Inside a block, eachinclause'seqqis, since thepattern_endlabel right after it starts a new basic block. In a method that block gets merged away, which is why only blocks were affected.The assertion wasn't guarding anything. A null next instruction just means the store and load can't be skipped, and the method already returns false for patterns. So I replaced it with a null check that returns false, and the generated code is the same as before with assertions off.
Since rake runs the tests with
-J-ea, this was quietly keeping 13 blocks in ruby/spec and the MRI tests from compiling. The new spec inspec/compiler/general_spec.rbfails in JIT and AOT mode with assertions on before this change, and passes in all four modes after it.