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Author SHA1 Message Date
Jonas Paulsson ac29f01788 [ScheduleDAGInstrs::buildSchedGraph()] Handling of memory dependecies rewritten. 
Recommited, after some fixing with test cases.

Updated test cases:
test/CodeGen/AArch64/arm64-misched-memdep-bug.ll
test/CodeGen/AArch64/tailcall_misched_graph.ll

Temporarily disabled test cases:
test/CodeGen/AMDGPU/split-vector-memoperand-offsets.ll
test/CodeGen/PowerPC/ppc64-fastcc.ll (partially updated)
test/CodeGen/PowerPC/vsx-fma-m.ll
test/CodeGen/PowerPC/vsx-fma-sp.ll

http://reviews.llvm.org/D8705
Reviewers: Hal Finkel, Andy Trick.

llvm-svn: 259673
 2016-02-03 17:52:29 +00:00
NAKAMURA Takumi 7f52d6d82c llvm/test/CodeGen/AArch64/tailcall_misched_graph.ll: s/REQUIRE/REQUIRES/ 
llvm-svn: 236928
 2015-05-09 05:59:00 +00:00
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