specific version of generalized problem: different computations of same value may be done different ways, e.g at higher precision than asked
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Eh? Opposite problem; it has to round to double after each op.
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The bug can occur even if you never spill once.
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-float-store is a buggy workaround for old gcc behavior that made stuff deterministic but worse/wrong.
End of conversation
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Oh, so the only distinction from naive semantics is your register spill has to be different?
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Yes, that's basically all. Assuming naive means no transformations you need to preclude.
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Nonconforming compilers have convinced scientists that their computers were possessed by evil spirits.
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