llvm-6502/test/CodeGen/X86/byval.ll

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; RUN: llvm-as < %s | llc -march=x86-64 | grep movq.*8.*rsp.*rax
%struct.s = type { i64, i64, i64 }
define i64 @f(%struct.s* byval %a) {
entry:
%tmp2 = getelementptr %struct.s* %a, i32 0, i32 0
%tmp3 = load i64* %tmp2, align 8
ret i64 %tmp3
}