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Add test for volatile_set_memory
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tests/run-pass/write-bytes.rs

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@@ -1,3 +1,5 @@
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#![feature(core_intrinsics)] // for `volatile_set_memory`
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#[repr(C)]
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#[derive(Copy, Clone)]
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struct Foo {
@@ -42,4 +44,42 @@ fn main() {
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assert_eq!(w[idx].b, 0xcdcdcdcdcdcdcdcd);
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assert_eq!(w[idx].c, 0xcdcdcdcdcdcdcdcd);
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}
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// -----
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// `std::intrinsics::volatile_set_memory` should behave identically
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let mut v: [u64; LENGTH] = [0; LENGTH];
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for idx in 0..LENGTH {
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assert_eq!(v[idx], 0);
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}
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unsafe {
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let p = v.as_mut_ptr();
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::std::intrinsics::volatile_set_memory(p, 0xab, LENGTH);
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}
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for idx in 0..LENGTH {
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assert_eq!(v[idx], 0xabababababababab);
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}
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// -----
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let mut w: [Foo; LENGTH] = [Foo { a: 0, b: 0, c: 0 }; LENGTH];
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for idx in 0..LENGTH {
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assert_eq!(w[idx].a, 0);
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assert_eq!(w[idx].b, 0);
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assert_eq!(w[idx].c, 0);
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}
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unsafe {
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let p = w.as_mut_ptr();
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::std::intrinsics::volatile_set_memory(p, 0xcd, LENGTH);
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}
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for idx in 0..LENGTH {
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assert_eq!(w[idx].a, 0xcdcdcdcdcdcdcdcd);
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assert_eq!(w[idx].b, 0xcdcdcdcdcdcdcdcd);
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assert_eq!(w[idx].c, 0xcdcdcdcdcdcdcdcd);
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}
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}

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