This patch adds `nocallback` attributes for string/math libcalls. It
allows FuncAttributor to infer `norecurse` more precisely and encourages
more aggressive global optimization.
This reduces the diff for upcoming changes. In some cases there were
already CHECK lines for the globals, but re-running update_test_check.py
deletes them without --check-globals being added. For
memset-pattern-tbaa.ll, the globals weren't checked but should have
been.
As it's causing some bot failures (and per request from kbarton).
This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.
llvm-svn: 358546
This is a recommit of r258620 which causes PR26293.
The original message:
Now LIR can turn following codes into memset:
typedef struct foo {
int a;
int b;
} foo_t;
void bar(foo_t *f, unsigned n) {
for (unsigned i = 0; i < n; ++i) {
f[i].a = 0;
f[i].b = 0;
}
}
void test(foo_t *f, unsigned n) {
for (unsigned i = 0; i < n; i += 2) {
f[i] = 0;
f[i+1] = 0;
}
}
llvm-svn: 258777
