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8dcc676c92
We already did `Transmute`-then-`PtrToPtr`; this adds the nearly-identical `PtrToPtr`-then-`Transmute`.
It also adds `transmute(Foo(x))` → `transmute(x)`, when `Foo` is a single-field transparent type. That's useful for things like `NonNull { pointer: p }.as_ptr()`.
Found these as I was looking at MCP807-related changes.
31 lines
829 B
Diff
31 lines
829 B
Diff
- // MIR for `keep_transparent_transmute` before InstSimplify-after-simplifycfg
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+ // MIR for `keep_transparent_transmute` after InstSimplify-after-simplifycfg
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fn keep_transparent_transmute() -> () {
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let mut _0: ();
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let _1: i16;
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let mut _3: std::num::Wrapping<i16>;
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scope 1 {
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debug _a => _1;
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let _2: i16;
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scope 2 {
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debug _a => _2;
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}
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}
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bb0: {
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StorageLive(_1);
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_1 = const keep_transparent_transmute::{constant#0} as i16 (Transmute);
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StorageLive(_2);
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StorageLive(_3);
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_3 = Wrapping::<i16>(const 0_i16);
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_2 = move _3 as i16 (Transmute);
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StorageDead(_3);
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_0 = const ();
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StorageDead(_2);
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StorageDead(_1);
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return;
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}
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}
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