463ad9098e
If LLVM 7 is used, generate memcpy/memmove with differing src/dst alignment. I've added new FFI functions to construct these through the builder API, which is more convenient than dealing with differing intrinsic signatures depending on the LLVM version.
130 lines
3.8 KiB
Rust
130 lines
3.8 KiB
Rust
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
// ignore-tidy-linelength
|
|
// compile-flags: -C no-prepopulate-passes
|
|
// min-llvm-version 7.0
|
|
|
|
#![crate_type = "lib"]
|
|
#![feature(repr_packed)]
|
|
|
|
#[repr(packed)]
|
|
pub struct Packed1 {
|
|
dealign: u8,
|
|
data: u32
|
|
}
|
|
|
|
#[repr(packed(2))]
|
|
pub struct Packed2 {
|
|
dealign: u8,
|
|
data: u32
|
|
}
|
|
|
|
// CHECK-LABEL: @write_pkd1
|
|
#[no_mangle]
|
|
pub fn write_pkd1(pkd: &mut Packed1) -> u32 {
|
|
// CHECK: %{{.*}} = load i32, i32* %{{.*}}, align 1
|
|
// CHECK: store i32 42, i32* %{{.*}}, align 1
|
|
let result = pkd.data;
|
|
pkd.data = 42;
|
|
result
|
|
}
|
|
|
|
// CHECK-LABEL: @write_pkd2
|
|
#[no_mangle]
|
|
pub fn write_pkd2(pkd: &mut Packed2) -> u32 {
|
|
// CHECK: %{{.*}} = load i32, i32* %{{.*}}, align 2
|
|
// CHECK: store i32 42, i32* %{{.*}}, align 2
|
|
let result = pkd.data;
|
|
pkd.data = 42;
|
|
result
|
|
}
|
|
|
|
pub struct Array([i32; 8]);
|
|
#[repr(packed)]
|
|
pub struct BigPacked1 {
|
|
dealign: u8,
|
|
data: Array
|
|
}
|
|
|
|
#[repr(packed(2))]
|
|
pub struct BigPacked2 {
|
|
dealign: u8,
|
|
data: Array
|
|
}
|
|
|
|
// CHECK-LABEL: @call_pkd1
|
|
#[no_mangle]
|
|
pub fn call_pkd1(f: fn() -> Array) -> BigPacked1 {
|
|
// CHECK: [[ALLOCA:%[_a-z0-9]+]] = alloca %Array
|
|
// CHECK: call void %{{.*}}(%Array* noalias nocapture sret dereferenceable(32) [[ALLOCA]])
|
|
// CHECK: call void @llvm.memcpy.{{.*}}(i8* align 1 %{{.*}}, i8* align 4 %{{.*}}, i{{[0-9]+}} 32, i1 false)
|
|
// check that calls whose destination is a field of a packed struct
|
|
// go through an alloca rather than calling the function with an
|
|
// unaligned destination.
|
|
BigPacked1 { dealign: 0, data: f() }
|
|
}
|
|
|
|
// CHECK-LABEL: @call_pkd2
|
|
#[no_mangle]
|
|
pub fn call_pkd2(f: fn() -> Array) -> BigPacked2 {
|
|
// CHECK: [[ALLOCA:%[_a-z0-9]+]] = alloca %Array
|
|
// CHECK: call void %{{.*}}(%Array* noalias nocapture sret dereferenceable(32) [[ALLOCA]])
|
|
// CHECK: call void @llvm.memcpy.{{.*}}(i8* align 2 %{{.*}}, i8* align 4 %{{.*}}, i{{[0-9]+}} 32, i1 false)
|
|
// check that calls whose destination is a field of a packed struct
|
|
// go through an alloca rather than calling the function with an
|
|
// unaligned destination.
|
|
BigPacked2 { dealign: 0, data: f() }
|
|
}
|
|
|
|
#[repr(packed)]
|
|
#[derive(Copy, Clone)]
|
|
pub struct Packed1Pair(u8, u32);
|
|
|
|
#[repr(packed(2))]
|
|
#[derive(Copy, Clone)]
|
|
pub struct Packed2Pair(u8, u32);
|
|
|
|
// CHECK-LABEL: @pkd1_pair
|
|
#[no_mangle]
|
|
pub fn pkd1_pair(pair1: &mut Packed1Pair, pair2: &mut Packed1Pair) {
|
|
// CHECK: call void @llvm.memcpy.{{.*}}(i8* align 1 %{{.*}}, i8* align 1 %{{.*}}, i{{[0-9]+}} 5, i1 false)
|
|
*pair2 = *pair1;
|
|
}
|
|
|
|
// CHECK-LABEL: @pkd2_pair
|
|
#[no_mangle]
|
|
pub fn pkd2_pair(pair1: &mut Packed2Pair, pair2: &mut Packed2Pair) {
|
|
// CHECK: call void @llvm.memcpy.{{.*}}(i8* align 2 %{{.*}}, i8* align 2 %{{.*}}, i{{[0-9]+}} 6, i1 false)
|
|
*pair2 = *pair1;
|
|
}
|
|
|
|
#[repr(packed)]
|
|
#[derive(Copy, Clone)]
|
|
pub struct Packed1NestedPair((u32, u32));
|
|
|
|
#[repr(packed(2))]
|
|
#[derive(Copy, Clone)]
|
|
pub struct Packed2NestedPair((u32, u32));
|
|
|
|
// CHECK-LABEL: @pkd1_nested_pair
|
|
#[no_mangle]
|
|
pub fn pkd1_nested_pair(pair1: &mut Packed1NestedPair, pair2: &mut Packed1NestedPair) {
|
|
// CHECK: call void @llvm.memcpy.{{.*}}(i8* align 1 %{{.*}}, i8* align 1 %{{.*}}, i{{[0-9]+}} 8, i1 false)
|
|
*pair2 = *pair1;
|
|
}
|
|
|
|
// CHECK-LABEL: @pkd2_nested_pair
|
|
#[no_mangle]
|
|
pub fn pkd2_nested_pair(pair1: &mut Packed2NestedPair, pair2: &mut Packed2NestedPair) {
|
|
// CHECK: call void @llvm.memcpy.{{.*}}(i8* align 2 %{{.*}}, i8* align 2 %{{.*}}, i{{[0-9]+}} 8, i1 false)
|
|
*pair2 = *pair1;
|
|
}
|
|
|