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Simplify assert terminator only if condition evaluates to expected value

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This commit is contained in:
Tomasz Miąsko 2020-10-21 00:00:00 +00:00
parent 22e6b9c689
commit a9470d0522
1 changed files with 4 additions and 3 deletions
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7
compiler/rustc_mir/src/transform/simplify_branches.rs
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@ -49,9 +49,10 @@ impl<'tcx> MirPass<'tcx> for SimplifyBranches {
}
TerminatorKind::Assert {
target, cond: Operand::Constant(ref c), expected, ..
} if (c.literal.try_eval_bool(tcx, param_env) == Some(true)) == expected => {
TerminatorKind::Goto { target }
}
} => match c.literal.try_eval_bool(tcx, param_env) {
Some(v) if v == expected => TerminatorKind::Goto { target },
_ => continue,
},
TerminatorKind::FalseEdge { real_target, .. } => {
TerminatorKind::Goto { target: real_target }
}