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Sparse complains when a shift amount is too big for the size
of its operand or if it's negative.
However, it does this even for expressions that are never evaluated.
It's especially annoying in the kernel for type generic macros,
for example the ones in arch/*/include/asm/cmpxchg.h
So, remove all warnings done at expansion time and avoid any
simplifications of such expressions. Same, at linearization
and optimization time but in this case mark the instructions as
'tainted' to inhibit any further simplifications. Finally, at the
end of the optimization phase, warn for the tainted instructions.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
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Like GCC, we don't want to touch over-sized ASR but over-sized
LSRs & SHLs degenerate to 0.
Add testcases covering all cases.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
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In the mathematical sense, the result of a left-shift by an
amount bigger than the operand size equals zero.
Do the corresponding simplification.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
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In the mathematical sense, the result of LSR by an amount bigger
than the operand size equals zero.
Do the corresponding simplification.
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
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