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69 lines
1.6 KiB
Rust
69 lines
1.6 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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// 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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