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rust/tests/codegen/slice-init.rs

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trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
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//@ compile-flags: -C no-prepopulate-passes
#![crate_type = "lib"]
// CHECK-LABEL: @zero_sized_elem
#[no_mangle]
pub fn zero_sized_elem() {
rustc_trans: use more of the trans::mir and ty::layout APIs throughout.
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// CHECK-NOT: br label %repeat_loop_header{{.*}}
Update some codegen tests for opaque pointers
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// CHECK-NOT: call void @llvm.memset.p0
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
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let x = [(); 4];
Fortify codegen test.
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opaque(&x);
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
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}
// CHECK-LABEL: @zero_len_array
#[no_mangle]
pub fn zero_len_array() {
rustc_trans: use more of the trans::mir and ty::layout APIs throughout.
2017-06-25 09:41:24 +00:00
// CHECK-NOT: br label %repeat_loop_header{{.*}}
Update some codegen tests for opaque pointers
2022-02-21 10:21:23 +00:00
// CHECK-NOT: call void @llvm.memset.p0
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
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let x = [4; 0];
Fortify codegen test.
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opaque(&x);
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
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}
// CHECK-LABEL: @byte_array
#[no_mangle]
pub fn byte_array() {
CHECK only for opaque ptr
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// CHECK: call void @llvm.memset.{{.+}}(ptr {{.*}}, i8 7, i{{[0-9]+}} 4
rustc_trans: use more of the trans::mir and ty::layout APIs throughout.
2017-06-25 09:41:24 +00:00
// CHECK-NOT: br label %repeat_loop_header{{.*}}
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
2017-07-26 14:27:25 +00:00
let x = [7u8; 4];
Fortify codegen test.
2023-03-11 18:36:10 +00:00
opaque(&x);
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
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}
#[allow(dead_code)]
#[derive(Copy, Clone)]
enum Init {
Loop,
Memset,
}
// CHECK-LABEL: @byte_enum_array
#[no_mangle]
pub fn byte_enum_array() {
CHECK only for opaque ptr
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// CHECK: call void @llvm.memset.{{.+}}(ptr {{.*}}, i8 {{.*}}, i{{[0-9]+}} 4
rustc_trans: use more of the trans::mir and ty::layout APIs throughout.
2017-06-25 09:41:24 +00:00
// CHECK-NOT: br label %repeat_loop_header{{.*}}
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
2017-07-26 14:27:25 +00:00
let x = [Init::Memset; 4];
Fortify codegen test.
2023-03-11 18:36:10 +00:00
opaque(&x);
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
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}
// CHECK-LABEL: @zeroed_integer_array
#[no_mangle]
pub fn zeroed_integer_array() {
CHECK only for opaque ptr
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// CHECK: call void @llvm.memset.{{.+}}(ptr {{.*}}, i8 0, i{{[0-9]+}} 16
rustc_trans: use more of the trans::mir and ty::layout APIs throughout.
2017-06-25 09:41:24 +00:00
// CHECK-NOT: br label %repeat_loop_header{{.*}}
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
2017-07-26 14:27:25 +00:00
let x = [0u32; 4];
Fortify codegen test.
2023-03-11 18:36:10 +00:00
opaque(&x);
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
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}
// CHECK-LABEL: @nonzero_integer_array
#[no_mangle]
pub fn nonzero_integer_array() {
rustc_trans: use more of the trans::mir and ty::layout APIs throughout.
2017-06-25 09:41:24 +00:00
// CHECK: br label %repeat_loop_header{{.*}}
Update some codegen tests for opaque pointers
2022-02-21 10:21:23 +00:00
// CHECK-NOT: call void @llvm.memset.p0
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
2017-07-26 14:27:25 +00:00
let x = [0x1a_2b_3c_4d_u32; 4];
Fortify codegen test.
2023-03-11 18:36:10 +00:00
opaque(&x);
trans: Optimize initialization using repeat expressions This elides initialization for zero-sized arrays: * for zero-sized elements we previously emitted an empty loop * for arrays with a length of zero we previously emitted a loop with zero iterations This emits llvm.memset() instead of a loop over each element when: * all elements are zero integers * elements are byte sized
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}
Fortify codegen test.
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// Use an opaque function to prevent rustc from removing useless drops.
#[inline(never)]
pub fn opaque(_: impl Sized) {}
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