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-rw-r--r--src/test/codegen/simd-wide-sum.rs55
1 files changed, 55 insertions, 0 deletions
diff --git a/src/test/codegen/simd-wide-sum.rs b/src/test/codegen/simd-wide-sum.rs
new file mode 100644
index 000000000..04314dc29
--- /dev/null
+++ b/src/test/codegen/simd-wide-sum.rs
@@ -0,0 +1,55 @@
+// compile-flags: -C opt-level=3 --edition=2021
+// only-x86_64
+// ignore-debug: the debug assertions get in the way
+
+#![crate_type = "lib"]
+#![feature(portable_simd)]
+
+use std::simd::{Simd, SimdUint};
+const N: usize = 8;
+
+#[no_mangle]
+// CHECK-LABEL: @wider_reduce_simd
+pub fn wider_reduce_simd(x: Simd<u8, N>) -> u16 {
+ // CHECK: zext <8 x i8>
+ // CHECK-SAME: to <8 x i16>
+ // CHECK: call i16 @llvm.vector.reduce.add.v8i16(<8 x i16>
+ let x: Simd<u16, N> = x.cast();
+ x.reduce_sum()
+}
+
+#[no_mangle]
+// CHECK-LABEL: @wider_reduce_loop
+pub fn wider_reduce_loop(x: Simd<u8, N>) -> u16 {
+ // CHECK: zext <8 x i8>
+ // CHECK-SAME: to <8 x i16>
+ // CHECK: call i16 @llvm.vector.reduce.add.v8i16(<8 x i16>
+ let mut sum = 0_u16;
+ for i in 0..N {
+ sum += u16::from(x[i]);
+ }
+ sum
+}
+
+#[no_mangle]
+// CHECK-LABEL: @wider_reduce_iter
+pub fn wider_reduce_iter(x: Simd<u8, N>) -> u16 {
+ // CHECK: zext <8 x i8>
+ // CHECK-SAME: to <8 x i16>
+ // CHECK: call i16 @llvm.vector.reduce.add.v8i16(<8 x i16>
+ x.as_array().iter().copied().map(u16::from).sum()
+}
+
+// This iterator one is the most interesting, as it's the one
+// which used to not auto-vectorize due to a suboptimality in the
+// `<array::IntoIter as Iterator>::fold` implementation.
+
+#[no_mangle]
+// CHECK-LABEL: @wider_reduce_into_iter
+pub fn wider_reduce_into_iter(x: Simd<u8, N>) -> u16 {
+ // FIXME MIR inlining messes up LLVM optimizations.
+ // WOULD-CHECK: zext <8 x i8>
+ // WOULD-CHECK-SAME: to <8 x i16>
+ // WOULD-CHECK: call i16 @llvm.vector.reduce.add.v8i16(<8 x i16>
+ x.to_array().into_iter().map(u16::from).sum()
+}