bjoernager/rust
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Use a C-safe return type for __rust_[ui]128_* overflowing intrinsics

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Combined with [1], this will change the overflowing multiplication
operations to return an `extern "C"`-safe type.

Link: https://github.com/rust-lang/compiler-builtins/pull/735 [1]
This commit is contained in:
Trevor Gross 2024-12-15 11:03:37 +00:00
parent dd333ca66f
commit a911da13dd
4 changed files with 73 additions and 72 deletions
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18
compiler/rustc_codegen_cranelift/src/codegen_i128.rs
View file

@ -76,20 +76,22 @@ pub(crate) fn maybe_codegen_mul_checked<'tcx>(
}
let is_signed = type_sign(lhs.layout().ty);
let out_ty = Ty::new_tup(fx.tcx, &[lhs.layout().ty, fx.tcx.types.bool]);
let out_place = CPlace::new_stack_slot(fx, fx.layout_of(out_ty));
let oflow_out_place = CPlace::new_stack_slot(fx, fx.layout_of(fx.tcx.types.i32));
let param_types = vec![
AbiParam::special(fx.pointer_type, ArgumentPurpose::StructReturn),
AbiParam::new(types::I128),
AbiParam::new(types::I128),
AbiParam::special(fx.pointer_type, ArgumentPurpose::Normal),
];
let args = [out_place.to_ptr().get_addr(fx), lhs.load_scalar(fx), rhs.load_scalar(fx)];
fx.lib_call(
let args = [lhs.load_scalar(fx), rhs.load_scalar(fx), oflow_out_place.to_ptr().get_addr(fx)];
let ret = fx.lib_call(
if is_signed { "__rust_i128_mulo" } else { "__rust_u128_mulo" },
param_types,
vec![],
vec![AbiParam::new(types::I128)],
&args,
);
Some(out_place.to_cvalue(fx))
let mul = ret[0];
let oflow = oflow_out_place.to_cvalue(fx).load_scalar(fx);
let oflow = clif_intcast(fx, oflow, types::I8, false);
let layout = fx.layout_of(Ty::new_tup(fx.tcx, &[lhs.layout().ty, fx.tcx.types.bool]));
Some(CValue::by_val_pair(mul, oflow, layout))
}

2
compiler/rustc_codegen_cranelift/src/compiler_builtins.rs
View file

@ -43,7 +43,7 @@ builtin_functions! {
fn __divti3(n: i128, d: i128) -> i128;
fn __umodti3(n: u128, d: u128) -> u128;
fn __modti3(n: i128, d: i128) -> i128;
fn __rust_u128_mulo(a: u128, b: u128) -> (u128, bool);
fn __rust_u128_mulo(a: u128, b: u128, oflow: &mut i32) -> u128;
// floats
fn __floattisf(i: i128) -> f32;