bjoernager/rust
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try to avoid some layout_of calls

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This commit is contained in:
Ralf Jung 2023-09-21 07:26:11 +02:00
parent 23fd2860fa
commit 0eff07b748
8 changed files with 75 additions and 71 deletions
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10
compiler/rustc_mir_transform/src/dataflow_const_prop.rs
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@ -234,20 +234,26 @@ impl<'tcx> ValueAnalysis<'tcx> for ConstAnalysis<'_, 'tcx> {
}
}
Rvalue::Cast(CastKind::IntToInt | CastKind::IntToFloat, operand, ty) => {
let Ok(layout) = self.tcx.layout_of(self.param_env.and(*ty)) else {
return ValueOrPlace::Value(FlatSet::Top);
};
match self.eval_operand(operand, state) {
FlatSet::Elem(op) => self
.ecx
.int_to_int_or_float(&op, *ty)
.int_to_int_or_float(&op, layout)
.map_or(FlatSet::Top, |result| self.wrap_immediate(*result)),
FlatSet::Bottom => FlatSet::Bottom,
FlatSet::Top => FlatSet::Top,
}
}
Rvalue::Cast(CastKind::FloatToInt | CastKind::FloatToFloat, operand, ty) => {
let Ok(layout) = self.tcx.layout_of(self.param_env.and(*ty)) else {
return ValueOrPlace::Value(FlatSet::Top);
};
match self.eval_operand(operand, state) {
FlatSet::Elem(op) => self
.ecx
.float_to_float_or_int(&op, *ty)
.float_to_float_or_int(&op, layout)
.map_or(FlatSet::Top, |result| self.wrap_immediate(*result)),
FlatSet::Bottom => FlatSet::Bottom,
FlatSet::Top => FlatSet::Top,