4a7b6c0e6c
`PtrMetadata` doesn't care about `*const`/`*mut`/`&`/`&mut`, so GVN away those casts in its argument. This includes updating MIR to allow calling PtrMetadata on references too, not just raw pointers. That means that `[T]::len` can be just `_0 = PtrMetadata(_1)`, for example. # Conflicts: # tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-abort.mir # tests/mir-opt/pre-codegen/slice_index.slice_get_unchecked_mut_range.PreCodegen.after.panic-unwind.mir
32 lines
724 B
Diff
32 lines
724 B
Diff
- // MIR for `array_len` before GVN
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+ // MIR for `array_len` after GVN
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fn array_len(_1: &mut [i32; 42]) -> usize {
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debug x => _1;
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let mut _0: usize;
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let _2: &[i32];
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let mut _3: &[i32; 42];
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let mut _4: *const [i32];
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scope 1 {
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debug x => _2;
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}
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bb0: {
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- StorageLive(_2);
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+ nop;
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StorageLive(_3);
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_3 = &(*_1);
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_2 = move _3 as &[i32] (PointerCoercion(Unsize));
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StorageDead(_3);
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StorageLive(_4);
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_4 = &raw const (*_2);
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- _0 = PtrMetadata(move _4);
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+ _0 = const 42_usize;
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StorageDead(_4);
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- StorageDead(_2);
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+ nop;
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return;
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}
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}
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