09825de61b
According to the LLVM reference: > A value of 0 or an omitted align argument means that the operation has the ABI alignment for the target. So loads/stores of fields of packed structs need to have their align set to 1. Implement that by tracking the alignment of `LvalueRef`s. Fixes #39376.
29 lines
846 B
Rust
29 lines
846 B
Rust
// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// compile-flags: -C no-prepopulate-passes
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#![crate_type = "lib"]
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#[repr(packed)]
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pub struct Packed {
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dealign: u8,
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data: u32
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}
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// CHECK-LABEL: @write_pkd
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#[no_mangle]
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pub fn write_pkd(pkd: &mut Packed) -> u32 {
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// CHECK: %{{.*}} = load i32, i32* %{{.*}}, align 1
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// CHECK: store i32 42, i32* %{{.*}}, align 1
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let result = pkd.data;
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pkd.data = 42;
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result
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}
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