bjoernager/rust
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Add a new compare_bytes intrinsic instead of calling memcmp directly

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This commit is contained in:
Scott McMurray 2023-08-02 12:45:52 -07:00
parent 85fbb57149
commit 502af03445
17 changed files with 267 additions and 22 deletions
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13
compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs
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@ -1155,6 +1155,19 @@ fn codegen_regular_intrinsic_call<'tcx>(
ret.write_cvalue(fx, CValue::by_val(is_eq_value, ret.layout()));
}
sym::compare_bytes => {
intrinsic_args!(fx, args => (lhs_ptr, rhs_ptr, bytes_val); intrinsic);
let lhs_ptr = lhs_ptr.load_scalar(fx);
let rhs_ptr = rhs_ptr.load_scalar(fx);
let bytes_val = bytes_val.load_scalar(fx);
let params = vec![AbiParam::new(fx.pointer_type); 3];
let returns = vec![AbiParam::new(types::I32)];
let args = &[lhs_ptr, rhs_ptr, bytes_val];
let cmp = fx.lib_call("memcmp", params, returns, args)[0];
ret.write_cvalue(fx, CValue::by_val(cmp, ret.layout()));
}
sym::const_allocate => {
intrinsic_args!(fx, args => (_size, _align); intrinsic);