Add some comments to PassMode
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@ -27,10 +27,16 @@ mod x86_win64;
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#[derive(Clone, Copy, PartialEq, Eq, Debug)]
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pub enum PassMode {
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/// Ignore the argument.
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///
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/// The argument is either uninhabited or a ZST.
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Ignore,
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/// Pass the argument directly.
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///
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/// The argument has a layout abi of `Scalar` or `Vector`.
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Direct(ArgAttributes),
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/// Pass a pair's elements directly in two arguments.
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///
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/// The argument has a layout abi of `ScalarPair`.
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Pair(ArgAttributes, ArgAttributes),
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/// Pass the argument after casting it, to either
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/// a single uniform or a pair of registers.
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