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Since we do 8-byte loads for va_arg of double, make sure the vararg buffer
alloca is 8-byte aligned.
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When GlobalOpt has determined that a GlobalVariable only ever has two values,
it would convert the GlobalVariable to a boolean, and introduce SelectInsts
at every load, to choose between the two possible values. These SelectInsts
introduce overhead and other unpleasantness.
This patch makes GlobalOpt just add range metadata to loads from such
GlobalVariables instead. This enables the same main optimization (as seen in
test/Transforms/GlobalOpt/integer-bool.ll), without introducing selects.
The main downside is that it doesn't get the memory savings of shrinking such
GlobalVariables, but this is expected to be negligible.
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some places.
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Incoming
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This patch also lays the groundwork for the single-use instruction trick to
reduce the number of temporary variables.
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struct argument
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Fix atomic decrement (operand order of emitted code was flipped).
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Instead of lowering pointers, teach the JSBackend how to handle them
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