bjoernager/rust
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Also use mir::Offset for pointer add

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This commit is contained in:
Scott McMurray 2023-04-25 22:41:34 -07:00
parent 8bcfc0e597
commit e1da77c76d
11 changed files with 117 additions and 77 deletions
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11
compiler/rustc_codegen_ssa/src/mir/rvalue.rs
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@ -819,8 +819,15 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
.builtin_deref(true)
.unwrap_or_else(|| bug!("deref of non-pointer {:?}", input_ty))
.ty;
let llty = bx.cx().backend_type(bx.cx().layout_of(pointee_type));
bx.inbounds_gep(llty, lhs, &[rhs])
let pointee_layout = bx.cx().layout_of(pointee_type);
if pointee_layout.is_zst() {
// `Offset` works in terms of the size of pointee,
// so offsetting a pointer to ZST is a noop.
lhs
} else {
let llty = bx.cx().backend_type(pointee_layout);
bx.inbounds_gep(llty, lhs, &[rhs])
}
}
mir::BinOp::Shl => common::build_unchecked_lshift(bx, lhs, rhs),
mir::BinOp::Shr => common::build_unchecked_rshift(bx, input_ty, lhs, rhs),