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//@ compile-flags: -C no-prepopulate-passes -Copt-level=0
#![crate_type = "lib"]
// Hack to get the correct size for the length part in slices
// CHECK: @helper([[USIZE:i[0-9]+]] %_1)
#[no_mangle]
pub fn helper(_: usize) {}
// CHECK-LABEL: @no_op_slice_adjustment
#[no_mangle]
pub fn no_op_slice_adjustment(x: &[u8]) -> &[u8] {
// We used to generate an extra alloca and memcpy for the block's trailing expression value, so
// check that we copy directly to the return value slot
// CHECK: %0 = insertvalue { ptr, [[USIZE]] } poison, ptr %x.0, 0
// CHECK: %1 = insertvalue { ptr, [[USIZE]] } %0, [[USIZE]] %x.1, 1
// CHECK: ret { ptr, [[USIZE]] } %1
{ x }
}
// CHECK-LABEL: @no_op_slice_adjustment2
#[no_mangle]
pub fn no_op_slice_adjustment2(x: &[u8]) -> &[u8] {
// We used to generate an extra alloca and memcpy for the function's return value, so check
// that there's no memcpy (the slice is written to sret_slot element-wise)
// CHECK-NOT: call void @llvm.memcpy.
no_op_slice_adjustment(x)
}
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