ecf62e4cdc
This still does not work on 32-bit archs because of an LLVM limitation, but this is only an optimization, so let's push it on 64-bit only for now. Fixes #37945
36 lines
1,004 B
Rust
36 lines
1,004 B
Rust
// Copyright 2017 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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// min-llvm-version 4.0
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// compile-flags: -O
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// ignore-x86
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// ignore-arm
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// ignore-emscripten
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// ignore 32-bit platforms (LLVM has a bug with them)
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// See issue #37945.
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#![crate_type = "lib"]
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use std::slice::Iter;
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// CHECK-LABEL: @is_empty_1
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#[no_mangle]
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pub fn is_empty_1(xs: Iter<f32>) -> bool {
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// CHECK-NOT: icmp eq float* {{.*}}, null
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{xs}.next().is_none()
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}
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// CHECK-LABEL: @is_empty_2
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#[no_mangle]
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pub fn is_empty_2(xs: Iter<f32>) -> bool {
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// CHECK-NOT: icmp eq float* {{.*}}, null
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xs.map(|&x| x).next().is_none()
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}
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