1 // RUN: %llvmgcc -O3 -S -o - %s | not grep readonly 2 // RUN: %llvmgcc -O3 -S -o - %s | not grep readnone 3 4 5 // The struct being passed byval means that we cannot mark the 6 // function readnone. Readnone would allow stores to the arg to 7 // be deleted in the caller. We also don't allow readonly since 8 // the callee might write to the byval parameter. The inliner 9 // would have to assume the worse and introduce an explicit 10 // temporary when inlining such a function, which is costly for 11 // the common case in which the byval argument is not written. 12 struct S { int A[1000]; }; 13 int __attribute__ ((const)) f(struct S x) { x.A[1] = 0; return x.A[0]; } 14 int g(struct S x) __attribute__ ((pure)); 15 int h(struct S x) { return g(x); } 16
