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109 lines
2.7 KiB
Rust
109 lines
2.7 KiB
Rust
//@ compile-flags: -C no-prepopulate-passes
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#![crate_type = "lib"]
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// CHECK-LABEL: @zero_sized_elem
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#[no_mangle]
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pub fn zero_sized_elem() {
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// CHECK-NOT: br label %repeat_loop_header{{.*}}
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// CHECK-NOT: call void @llvm.memset.p0
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let x = [(); 4];
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opaque(&x);
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}
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// CHECK-LABEL: @zero_len_array
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#[no_mangle]
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pub fn zero_len_array() {
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// CHECK-NOT: br label %repeat_loop_header{{.*}}
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// CHECK-NOT: call void @llvm.memset.p0
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let x = [4; 0];
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opaque(&x);
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}
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// CHECK-LABEL: @byte_array
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#[no_mangle]
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pub fn byte_array() {
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// CHECK: call void @llvm.memset.{{.+}}(ptr {{.*}}, i8 7, i{{[0-9]+}} 4
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// CHECK-NOT: br label %repeat_loop_header{{.*}}
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let x = [7u8; 4];
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opaque(&x);
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}
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#[allow(dead_code)]
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#[derive(Copy, Clone)]
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enum Init {
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Loop,
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Memset,
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}
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// CHECK-LABEL: @byte_enum_array
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#[no_mangle]
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pub fn byte_enum_array() {
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// CHECK: call void @llvm.memset.{{.+}}(ptr {{.*}}, i8 {{.*}}, i{{[0-9]+}} 4
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// CHECK-NOT: br label %repeat_loop_header{{.*}}
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let x = [Init::Memset; 4];
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opaque(&x);
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}
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// CHECK-LABEL: @zeroed_integer_array
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#[no_mangle]
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pub fn zeroed_integer_array() {
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// CHECK: call void @llvm.memset.{{.+}}(ptr {{.*}}, i8 0, i{{[0-9]+}} 16
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// CHECK-NOT: br label %repeat_loop_header{{.*}}
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let x = [0u32; 4];
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opaque(&x);
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}
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// CHECK-LABEL: @nonzero_integer_array
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#[no_mangle]
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pub fn nonzero_integer_array() {
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// CHECK: br label %repeat_loop_header{{.*}}
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// CHECK-NOT: call void @llvm.memset.p0
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let x = [0x1a_2b_3c_4d_u32; 4];
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opaque(&x);
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}
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const N: usize = 100;
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// CHECK-LABEL: @u16_init_one_bytes
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#[no_mangle]
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pub fn u16_init_one_bytes() -> [u16; N] {
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// CHECK-NOT: select
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// CHECK-NOT: br
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// CHECK-NOT: switch
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// CHECK-NOT: icmp
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// CHECK: call void @llvm.memset.p0
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[const { u16::from_be_bytes([1, 1]) }; N]
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}
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// FIXME: undef bytes can just be initialized with the same value as the
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// defined bytes, if the defines bytes are all the same.
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// CHECK-LABEL: @option_none_init
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#[no_mangle]
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pub fn option_none_init() -> [Option<u8>; N] {
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// CHECK-NOT: select
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// CHECK: br label %repeat_loop_header{{.*}}
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// CHECK-NOT: switch
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// CHECK: icmp
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// CHECK-NOT: call void @llvm.memset.p0
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[None; N]
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}
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use std::mem::MaybeUninit;
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// FIXME: This could be optimized into a memset.
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// Regression test for <https://github.com/rust-lang/rust/issues/137892>.
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#[no_mangle]
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pub fn half_uninit() -> [(u128, MaybeUninit<u128>); N] {
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// CHECK-NOT: select
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// CHECK: br label %repeat_loop_header{{.*}}
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// CHECK-NOT: switch
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// CHECK: icmp
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// CHECK-NOT: call void @llvm.memset.p0
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[const { (0, MaybeUninit::uninit()) }; N]
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}
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// Use an opaque function to prevent rustc from removing useless drops.
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#[inline(never)]
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pub fn opaque(_: impl Sized) {}
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