1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s
2
3 // It could hit in @llvm.memcpy with "-triple x86_64-(mingw32|win32)".
4 // CHECK-NOT: readonly
5 // CHECK-NOT: readnone
6
7 // The struct being passed byval means that we cannot mark the
8 // function readnone. Readnone would allow stores to the arg to
9 // be deleted in the caller. We also don't allow readonly since
10 // the callee might write to the byval parameter. The inliner
11 // would have to assume the worse and introduce an explicit
12 // temporary when inlining such a function, which is costly for
13 // the common case in which the byval argument is not written.
14 struct S { int A[1000]; };
f(struct S x)15 int __attribute__ ((const)) f(struct S x) { x.A[1] = 0; return x.A[0]; }
16 int g(struct S x) __attribute__ ((pure));
h(struct S x)17 int h(struct S x) { return g(x); }
18