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During deletion, the killing of expressions was not considered.
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The lazy code motion optimisation pass could violate its guarantees
eliminating partial redundancy by moving an expression to before a call
instruction.
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branch and alub overlap in their use cases, but the backends rely on
knowing that the result is unused in their lowering of branch. By
extending alub so that the destination is optional, it can fully replace
branch.
This simplifies rtl by reducing code duplication and the number of
instructions.
Also, in the x86 and arm backends, we can now use 'test' and
{'tst','mvn','teq'} to lower some alubs without destinations. This is
particularly good for x86, as sequences such as 'is_boxed' type tests
now get shorter (both from not needing a mov to copy the variable, but
also from the fact that 'testb' encodes shorter than 'andq').
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* Rewrite matching statements in ?when_option macro to form that silences
dialyzer's unmatched_return warnings
* Treat compiler warnings as errors when compiling files in main
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Bug causing hipe to crash. Only provoked when changing the RTL
generation for floating point operations.
hipe_rtl:defines() was called with a expression ID instead of an
expression. Use expr_id_map_get_expr() to get expression from ID.
Need to pass along IdMap in order to do that.
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