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