66 lines
2.2 KiB
Rust
66 lines
2.2 KiB
Rust
// unit-test: InstSimplify
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// compile-flags: -C panic=abort
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#![crate_type = "lib"]
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#![feature(core_intrinsics)]
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#![feature(custom_mir)]
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use std::intrinsics::mir::*;
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use std::mem::{MaybeUninit, ManuallyDrop, transmute};
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// EMIT_MIR combine_transmutes.identity_transmutes.InstSimplify.diff
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pub unsafe fn identity_transmutes() {
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// CHECK-LABEL: fn identity_transmutes(
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// CHECK-NOT: as i32 (Transmute);
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// CHECK-NOT: as Vec<i32> (Transmute);
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// These are nops and should be removed
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let _a = transmute::<i32, i32>(1);
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let _a = transmute::<Vec<i32>, Vec<i32>>(Vec::new());
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}
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#[custom_mir(dialect = "runtime", phase = "initial")]
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// EMIT_MIR combine_transmutes.integer_transmutes.InstSimplify.diff
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pub unsafe fn integer_transmutes() {
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// CHECK-LABEL: fn integer_transmutes(
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// CHECK-NOT: _i32 as u32 (Transmute);
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// CHECK: _i32 as u32 (IntToInt);
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// CHECK: _i32 as i64 (Transmute);
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// CHECK-NOT: _u64 as i64 (Transmute);
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// CHECK: _u64 as i64 (IntToInt);
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// CHECK: _u64 as u32 (Transmute);
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// CHECK-NOT: _isize as usize (Transmute);
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// CHECK: _isize as usize (IntToInt);
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mir! {
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{
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let A = CastTransmute::<i32, u32>(1); // Can be a cast
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let B = CastTransmute::<i32, i64>(1); // UB
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let C = CastTransmute::<u64, i64>(1); // Can be a cast
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let D = CastTransmute::<u64, u32>(1); // UB
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let E = CastTransmute::<isize, usize>(1); // Can be a cast
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Return()
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}
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}
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}
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// EMIT_MIR combine_transmutes.adt_transmutes.InstSimplify.diff
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pub unsafe fn adt_transmutes() {
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// CHECK-LABEL: fn adt_transmutes(
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// CHECK: as u8 (Transmute);
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// CHECK: ({{_.*}}.0: i16);
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// CHECK: as u16 (Transmute);
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// CHECK: as u32 (Transmute);
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// CHECK: as i32 (Transmute);
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// CHECK: ({{_.*}}.1: std::mem::ManuallyDrop<std::string::String>);
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let _a: u8 = transmute(Some(std::num::NonZeroU8::MAX));
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let _a: i16 = transmute(std::num::Wrapping(0_i16));
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let _a: u16 = transmute(std::num::Wrapping(0_i16));
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let _a: u32 = transmute(Union32 { i32: 0 });
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let _a: i32 = transmute(Union32 { u32: 0 });
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let _a: ManuallyDrop<String> = transmute(MaybeUninit::<String>::uninit());
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}
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pub union Union32 { u32: u32, i32: i32 }
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