rust/tests/codegen/move-operands.rs

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2023-07-18 18:18:17 +00:00
// Verify that optimized MIR only copies `a` once.
//@ compile-flags: -O -C no-prepopulate-passes
#![crate_type = "lib"]
type T = [u8; 256];
#[no_mangle]
pub fn f(a: T, b: fn(_: T, _: T)) {
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// CHECK: call void @llvm.memcpy.{{.*}}(ptr align 1 %{{.*}}, ptr align 1 %{{.*}}, {{.*}} 256, i1 false)
// CHECK-NOT: call void @llvm.memcpy.{{.*}}(ptr align 1 %{{.*}}, ptr align 1 %{{.*}}, {{.*}} 256, i1 false)
b(a, a)
}