| //@ compile-flags: -O -Z merge-functions=disabled |
| //@ only-x86_64 |
| |
| #![crate_type = "lib"] |
| |
| use std::mem::swap; |
| |
| type RGB48 = [u16; 3]; |
| |
| // CHECK-LABEL: @swap_rgb48_manually( |
| #[no_mangle] |
| pub fn swap_rgb48_manually(x: &mut RGB48, y: &mut RGB48) { |
| // FIXME: See #115212 for why this has an alloca again |
| |
| // CHECK: alloca [6 x i8], align 2 |
| // CHECK: call void @llvm.memcpy.p0.p0.i64({{.+}}, i64 6, i1 false) |
| // CHECK: call void @llvm.memcpy.p0.p0.i64({{.+}}, i64 6, i1 false) |
| // CHECK: call void @llvm.memcpy.p0.p0.i64({{.+}}, i64 6, i1 false) |
| |
| let temp = *x; |
| *x = *y; |
| *y = temp; |
| } |
| |
| // CHECK-LABEL: @swap_rgb48 |
| #[no_mangle] |
| pub fn swap_rgb48(x: &mut RGB48, y: &mut RGB48) { |
| // CHECK-NOT: alloca |
| |
| // Whether `i8` is the best for this is unclear, but |
| // might as well record what's actually happening right now. |
| |
| // CHECK: load i8 |
| // CHECK: load i8 |
| // CHECK: store i8 |
| // CHECK: store i8 |
| swap(x, y) |
| } |
| |
| type RGBA64 = [u16; 4]; |
| |
| // CHECK-LABEL: @swap_rgba64 |
| #[no_mangle] |
| pub fn swap_rgba64(x: &mut RGBA64, y: &mut RGBA64) { |
| // CHECK-NOT: alloca |
| // CHECK-DAG: %[[XVAL:.+]] = load i64, ptr %x, align 2 |
| // CHECK-DAG: %[[YVAL:.+]] = load i64, ptr %y, align 2 |
| // CHECK-DAG: store i64 %[[YVAL]], ptr %x, align 2 |
| // CHECK-DAG: store i64 %[[XVAL]], ptr %y, align 2 |
| swap(x, y) |
| } |
| |
| // CHECK-LABEL: @swap_vecs |
| #[no_mangle] |
| pub fn swap_vecs(x: &mut Vec<u32>, y: &mut Vec<u32>) { |
| // CHECK-NOT: alloca |
| // There are plenty more loads and stores than just these, |
| // but at least one sure better be 64-bit (for size or capacity). |
| // CHECK: load i64 |
| // CHECK: load i64 |
| // CHECK: store i64 |
| // CHECK: store i64 |
| // CHECK: ret void |
| swap(x, y) |
| } |
| |
| // CHECK-LABEL: @swap_slices |
| #[no_mangle] |
| pub fn swap_slices<'a>(x: &mut &'a [u32], y: &mut &'a [u32]) { |
| // CHECK-NOT: alloca |
| // CHECK: load ptr |
| // CHECK: load i64 |
| // CHECK: call void @llvm.memcpy.p0.p0.i64({{.+}}, i64 16, i1 false) |
| // CHECK: store ptr |
| // CHECK: store i64 |
| swap(x, y) |
| } |
| |
| // LLVM doesn't vectorize a loop over 3-byte elements, |
| // so we chunk it down to bytes and loop over those instead. |
| type RGB24 = [u8; 3]; |
| |
| // CHECK-LABEL: @swap_rgb24_slices |
| #[no_mangle] |
| pub fn swap_rgb24_slices(x: &mut [RGB24], y: &mut [RGB24]) { |
| // CHECK-NOT: alloca |
| // CHECK: load <{{[0-9]+}} x i8> |
| // CHECK: store <{{[0-9]+}} x i8> |
| if x.len() == y.len() { |
| x.swap_with_slice(y); |
| } |
| } |
| |
| // This one has a power-of-two size, so we iterate over it directly |
| type RGBA32 = [u8; 4]; |
| |
| // CHECK-LABEL: @swap_rgba32_slices |
| #[no_mangle] |
| pub fn swap_rgba32_slices(x: &mut [RGBA32], y: &mut [RGBA32]) { |
| // CHECK-NOT: alloca |
| // CHECK: load <{{[0-9]+}} x i32> |
| // CHECK: store <{{[0-9]+}} x i32> |
| if x.len() == y.len() { |
| x.swap_with_slice(y); |
| } |
| } |
| |
| // Strings have a non-power-of-two size, but have pointer alignment, |
| // so we swap usizes instead of dropping all the way down to bytes. |
| const _: () = assert!(!std::mem::size_of::<String>().is_power_of_two()); |
| |
| // CHECK-LABEL: @swap_string_slices |
| #[no_mangle] |
| pub fn swap_string_slices(x: &mut [String], y: &mut [String]) { |
| // CHECK-NOT: alloca |
| // CHECK: load <{{[0-9]+}} x i64> |
| // CHECK: store <{{[0-9]+}} x i64> |
| if x.len() == y.len() { |
| x.swap_with_slice(y); |
| } |
| } |
| |
| #[repr(C, packed)] |
| pub struct Packed { |
| pub first: bool, |
| pub second: usize, |
| } |
| |
| // CHECK-LABEL: @swap_packed_structs |
| #[no_mangle] |
| pub fn swap_packed_structs(x: &mut Packed, y: &mut Packed) { |
| // CHECK-NOT: alloca |
| // CHECK: ret void |
| swap(x, y) |
| } |