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24 lines
767 B
Rust
24 lines
767 B
Rust
// compile-flags: -O
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// only-64bit (because we're using [ui]size)
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// ignore-debug (because the assertions get in the way)
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// min-llvm-version: 15.0 (because this is a relatively new instcombine)
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#![crate_type = "lib"]
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#![feature(slice_from_ptr_range)]
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// This is intentionally using a non-power-of-two array length,
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// as that's where the optimization differences show up
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// CHECK-LABEL: @flatten_via_ptr_range
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#[no_mangle]
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pub fn flatten_via_ptr_range(slice_of_arrays: &[[i32; 13]]) -> &[i32] {
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// CHECK-NOT: lshr
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// CHECK-NOT: udiv
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// CHECK: mul nuw nsw i64 %{{.+}}, 13
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// CHECK-NOT: lshr
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// CHECK-NOT: udiv
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let r = slice_of_arrays.as_ptr_range();
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let r = r.start.cast()..r.end.cast();
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unsafe { core::slice::from_ptr_range(r) }
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}
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