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Scott McMurray
871664e02a
Essentially the same as 157560, just for `copy` instead of `copy_nonoverlapping`.
18 lines
631 B
Rust
18 lines
631 B
Rust
//@ compile-flags: -Copt-level=3 -C no-prepopulate-passes
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//@ only-64bit (so I don't need to worry about usize)
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#![crate_type = "lib"]
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#![feature(core_intrinsics)]
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// This deals in a count of elements, not bytes, so we need to multiply.
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// Ensure we preserve UB from a count too high to be valid.
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use std::intrinsics::copy;
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// CHECK-LABEL: @copy_u16(
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#[no_mangle]
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pub unsafe fn copy_u16(src: *const u16, dst: *mut u16, count: usize) {
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// CHECK: [[BYTES:%.+]] = mul nuw nsw i64 2, %count
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// CHECK: call void @llvm.memmove.p0.p0.i64(ptr align 2 %dst, ptr align 2 %src, i64 [[BYTES]], i1 false)
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copy(src, dst, count)
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}
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