Arnold Schwaighofer f54b73d681 ScheduleDAGInstrs: In functions with tail calls PseudoSourceValues are not non-aliasing distinct objects ...

The code that builds the dependence graph assumes that two PseudoSourceValues
don't alias. In a tail calling function two FixedStackObjects might refer to the
same location. Worse 'immutable' fixed stack objects like function arguments are
not immutable and will be clobbered.

Change this so that a load from a FixedStackObject is not invariant in a tail
calling function and don't return a PseudoSourceValue for an instruction in tail
calling functions when building the dependence graph so that we handle function
arguments conservatively.

Fix for PR23459.

rdar://20740035

llvm-svn: 236916

2015-05-08 23:52:00 +00:00

1.3 KiB

Raw Blame History

View Raw