tests/codegen/layout-size-checks.rs


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// compile-flags: -O
// only-x86_64
// ignore-debug: the debug assertions get in the way

#![crate_type = "lib"]

use std::alloc::Layout;

type RGB48 = [u16; 3];

// CHECK-LABEL: @layout_array_rgb48
#[no_mangle]
pub fn layout_array_rgb48(n: usize) -> Layout {
    // CHECK-NOT: llvm.umul.with.overflow.i64
    // CHECK: icmp ugt i64 %n, 1537228672809129301
    // CHECK-NOT: llvm.umul.with.overflow.i64
    // CHECK: mul nuw nsw i64 %n, 6
    // CHECK-NOT: llvm.umul.with.overflow.i64
    Layout::array::<RGB48>(n).unwrap()
}

// CHECK-LABEL: @layout_array_i32
#[no_mangle]
pub fn layout_array_i32(n: usize) -> Layout {
    // CHECK-NOT: llvm.umul.with.overflow.i64
    // CHECK: icmp ugt i64 %n, 2305843009213693951
    // CHECK-NOT: llvm.umul.with.overflow.i64
    // CHECK: shl nuw nsw i64 %n, 2
    // CHECK-NOT: llvm.umul.with.overflow.i64
    Layout::array::<i32>(n).unwrap()
}