mirror of https://github.com/rust-lang/rust
53 lines
1.5 KiB
Rust
53 lines
1.5 KiB
Rust
//@ test-mir-pass: SimplifyCfg-after-unreachable-enum-branching
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#![feature(custom_mir, core_intrinsics)]
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#![crate_type = "lib"]
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use std::intrinsics::mir::*;
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// Check that we correctly cleaned up the dead BB.
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// EMIT_MIR simplify_dead_blocks.assert_nonzero_nonmax.SimplifyCfg-after-unreachable-enum-branching.diff
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#[custom_mir(dialect = "runtime", phase = "post-cleanup")]
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pub unsafe fn assert_nonzero_nonmax(x: u8) -> u8 {
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// CHECK-LABEL: fn assert_nonzero_nonmax(
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// CHECK: bb0: {
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// CHECK-NEXT: switchInt({{.*}}) -> [0: [[unreachable:bb.*]], 1: [[retblock2:bb.*]], 255: [[unreachable:bb.*]], otherwise: [[retblock:bb.*]]];
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// CHECK-NEXT: }
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// CHECK-NOT: _0 = const 1_u8;
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// CHECK: [[retblock2]]: {
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// CHECK-NEXT: _0 = const 2_u8;
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// CHECK-NEXT: return;
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// CHECK-NEXT: }
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// CHECK: [[unreachable]]: {
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// CHECK-NEXT: unreachable;
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// CHECK-NEXT: }
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// CHECK: [[retblock]]: {
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// CHECK-NEXT: _0 = _1;
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// CHECK-NEXT: return;
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// CHECK-NEXT: }
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mir!(
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{
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match x {
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0 => unreachable,
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1 => retblock2,
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u8::MAX => unreachable,
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_ => retblock,
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}
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}
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deadRetblock1 = {
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RET = 1;
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Return()
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}
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retblock2 = {
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RET = 2;
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Return()
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}
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unreachable = {
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Unreachable()
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}
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retblock = {
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RET = x;
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Return()
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}
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)
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}
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