When converting strchr(p, '\0') to p + strlen(p) we know that
strlen() must return an offset that is inbounds of the allocated
object (otherwise it would be UB), so we can use an inbounds GEP.
An equivalent argument can be made for the other cases.
I noticed we weren't propagating tail flags on calls when
FortifiedLibCallSimplifier.optimizeCall() was replacing calls to runtime
checked calls to the non-checked routines (when safe to do so). Make
sure to check this before replacing the original calls!
Also, avoid any libcall transforms when notail/musttail is present.
PR46734
Fixes: https://github.com/llvm/llvm-project/issues/46079
Reviewed By: jdoerfert
Differential Revision: https://reviews.llvm.org/D107872
I think we can use here same logic as for nonnull.
strlen(X) - X must be noundef => valid pointer.
for libcalls with size arg, we add noundef only if size is known and greater than 0 - so pointers must be noundef (valid ones)
Reviewed By: jdoerfert, aqjune
Differential Revision: https://reviews.llvm.org/D95122
As it's causing some bot failures (and per request from kbarton).
This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.
llvm-svn: 358546
This reverts commit SVN r331889, which could trigger failed
assertions for cases where the snprintf function is declared
with a vaguely differing signature (e.g. being defined as
static inline), see PR37408.
llvm-svn: 332043
