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Pull a layout computation out of a loop

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This commit is contained in:
Oliver Schneider 2018-05-30 12:06:16 +02:00
parent 1236d57d84
commit 823013349f
1 changed files with 4 additions and 1 deletions
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5
src/librustc_mir/interpret/terminator/mod.rs
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@ -39,12 +39,15 @@ impl<'a, 'mir, 'tcx, M: Machine<'mir, 'tcx>> EvalContext<'a, 'mir, 'tcx, M> {
} => {
let discr_val = self.eval_operand(discr)?;
let discr_prim = self.value_to_scalar(discr_val)?;
let discr_layout = self.layout_of(discr_val.ty).unwrap();
trace!("SwitchInt({:?}, {:#?})", discr_prim, discr_layout);
let discr_prim = discr_prim.to_bits(discr_layout.size)?;
// Branch to the `otherwise` case by default, if no match is found.
let mut target_block = targets[targets.len() - 1];
for (index, &const_int) in values.iter().enumerate() {
if discr_prim.to_bits(self.layout_of(discr_val.ty).unwrap().size)? == const_int {
if discr_prim == const_int {
target_block = targets[index];
break;
}