64 lines
1.6 KiB
Rust
64 lines
1.6 KiB
Rust
// compile-flags: -O
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// only-x86_64
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// ignore-debug: the debug assertions get in the way
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#![crate_type = "lib"]
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use std::mem::swap;
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type RGB48 = [u16; 3];
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// CHECK-LABEL: @swap_rgb48
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#[no_mangle]
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pub fn swap_rgb48(x: &mut RGB48, y: &mut RGB48) {
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// FIXME MIR inlining messes up LLVM optimizations.
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// WOULD-CHECK-NOT: alloca
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// WOULD-CHECK: load i48
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// WOULD-CHECK: store i48
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swap(x, y)
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}
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// LLVM doesn't vectorize a loop over 3-byte elements,
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// so we chunk it down to bytes and loop over those instead.
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type RGB24 = [u8; 3];
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// CHECK-LABEL: @swap_rgb24_slices
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#[no_mangle]
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pub fn swap_rgb24_slices(x: &mut [RGB24], y: &mut [RGB24]) {
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// CHECK-NOT: alloca
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// CHECK: load <{{[0-9]+}} x i8>
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// CHECK: store <{{[0-9]+}} x i8>
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if x.len() == y.len() {
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x.swap_with_slice(y);
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}
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}
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// This one has a power-of-two size, so we iterate over it directly
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type RGBA32 = [u8; 4];
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// CHECK-LABEL: @swap_rgba32_slices
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#[no_mangle]
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pub fn swap_rgba32_slices(x: &mut [RGBA32], y: &mut [RGBA32]) {
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// CHECK-NOT: alloca
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// CHECK: load <{{[0-9]+}} x i32>
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// CHECK: store <{{[0-9]+}} x i32>
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if x.len() == y.len() {
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x.swap_with_slice(y);
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}
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}
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// Strings have a non-power-of-two size, but have pointer alignment,
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// so we swap usizes instead of dropping all the way down to bytes.
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const _: () = assert!(!std::mem::size_of::<String>().is_power_of_two());
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// CHECK-LABEL: @swap_string_slices
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#[no_mangle]
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pub fn swap_string_slices(x: &mut [String], y: &mut [String]) {
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// CHECK-NOT: alloca
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// CHECK: load <{{[0-9]+}} x i64>
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// CHECK: store <{{[0-9]+}} x i64>
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if x.len() == y.len() {
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x.swap_with_slice(y);
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}
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}
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