From e1b020df9f72eab7e8b3e38a5263ddda54ce18e1 Mon Sep 17 00:00:00 2001 From: Scott McMurray Date: Fri, 26 May 2023 03:32:22 -0700 Subject: Use `load`-`store` instead of `memcpy` for short integer arrays --- tests/codegen/array-codegen.rs | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 tests/codegen/array-codegen.rs (limited to 'tests/codegen/array-codegen.rs') diff --git a/tests/codegen/array-codegen.rs b/tests/codegen/array-codegen.rs new file mode 100644 index 00000000000..98488eb92ee --- /dev/null +++ b/tests/codegen/array-codegen.rs @@ -0,0 +1,35 @@ +// compile-flags: -O -C no-prepopulate-passes +// min-llvm-version: 15.0 (for opaque pointers) + +#![crate_type = "lib"] + +// CHECK-LABEL: @array_load +#[no_mangle] +pub fn array_load(a: &[u8; 4]) -> [u8; 4] { + // CHECK: %0 = alloca [4 x i8], align 1 + // CHECK: %[[TEMP1:.+]] = load <4 x i8>, ptr %a, align 1 + // CHECK: store <4 x i8> %[[TEMP1]], ptr %0, align 1 + // CHECK: %[[TEMP2:.+]] = load i32, ptr %0, align 1 + // CHECK: ret i32 %[[TEMP2]] + *a +} + +// CHECK-LABEL: @array_store +#[no_mangle] +pub fn array_store(a: [u8; 4], p: &mut [u8; 4]) { + // CHECK: %a = alloca [4 x i8] + // CHECK: %[[TEMP:.+]] = load <4 x i8>, ptr %a, align 1 + // CHECK-NEXT: store <4 x i8> %[[TEMP]], ptr %p, align 1 + *p = a; +} + +// CHECK-LABEL: @array_copy +#[no_mangle] +pub fn array_copy(a: &[u8; 4], p: &mut [u8; 4]) { + // CHECK: %[[LOCAL:.+]] = alloca [4 x i8], align 1 + // CHECK: %[[TEMP1:.+]] = load <4 x i8>, ptr %a, align 1 + // CHECK: store <4 x i8> %[[TEMP1]], ptr %[[LOCAL]], align 1 + // CHECK: %[[TEMP2:.+]] = load <4 x i8>, ptr %[[LOCAL]], align 1 + // CHECK: store <4 x i8> %[[TEMP2]], ptr %p, align 1 + *p = *a; +} -- cgit 1.4.1-3-g733a5