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Explain side-effects from simplify_operand.

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This commit is contained in:
Camille GILLOT 2024-01-08 22:44:38 +00:00
parent 22ed51e136
commit 166fe54eba
1 changed files with 4 additions and 0 deletions
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4
compiler/rustc_mir_transform/src/gvn.rs
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@ -794,6 +794,8 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
let ty = lhs.ty(self.local_decls, self.tcx);
let lhs = self.simplify_operand(lhs, location);
let rhs = self.simplify_operand(rhs, location);
// Only short-circuit options after we called `simplify_operand`
// on both operands for side effect.
let lhs = lhs?;
let rhs = rhs?;
if let Some(value) = self.simplify_binary(op, false, ty, lhs, rhs) {
@ -805,6 +807,8 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
let ty = lhs.ty(self.local_decls, self.tcx);
let lhs = self.simplify_operand(lhs, location);
let rhs = self.simplify_operand(rhs, location);
// Only short-circuit options after we called `simplify_operand`
// on both operands for side effect.
let lhs = lhs?;
let rhs = rhs?;
if let Some(value) = self.simplify_binary(op, true, ty, lhs, rhs) {