forked from OSchip/llvm-project
16 lines
748 B
C
16 lines
748 B
C
// RUN: %llvmgcc -O3 -S -o - -emit-llvm %s | not grep readonly
|
|
// RUN: %llvmgcc -O3 -S -o - -emit-llvm %s | not grep 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); }
|