Use PredIteratorCache in LCSSA, which gives a 37% overall speedup on the testcase from PR3549.  More improvements to come.

llvm-svn: 69788

Patch by Peter Johnson.

llvm-svn: 69785

llvm-svn: 69752

practical benefit in the case of ScalarEvolution, and it's otherwise
a nuisance.

llvm-svn: 69749

This fixes a very subtle bug. vr defined by an implicit_def is allowed overlap with any register since it doesn't actually modify anything. However, if it's used as a two-address use, its live range can be extended and it can be spilled. The spiller must take care not to emit a reload for the vn number that's defined by the implicit_def. This is both a correctness and performance issue.

llvm-svn: 69743

type to truncate to should be the number of bits of the value that are
preserved, not the number that are clobbered with sign-extension.
This fixes regressions in ldecod.

llvm-svn: 69704

Should now work when building with objdir != srcdir and when llvm-gcc is not
available.

Thanks to Duncan Sands for testing and advice!

llvm-svn: 69700

llvm-svn: 69684

llvm-svn: 69680

Patch by Jay Foad!

llvm-svn: 69679

Patch by Jay Foad!

llvm-svn: 69678

non-zero exit status, so nm will already have printed some error
messages.'

Patch by Jay Foad!

llvm-svn: 69677

Spotted by gcc-4.5.

llvm-svn: 69673

This fixes PR4002.

llvm-svn: 69672

llvm-svn: 69665

as they appear in LLVM IR. This isn't particularly interesting
on its own; this is just setting up some infrastructure.

llvm-svn: 69655

llvm-svn: 69651

and SCEVSignExtendExpr.

llvm-svn: 69649

llvm-svn: 69645

the code to minimize dependencies on TargetData.

llvm-svn: 69644

llvm-svn: 69643

llvm-svn: 69640

Patch by Marius Wachtler

llvm-svn: 69637

This makes the extra copyRegToReg calls in ScheduleDAGSDNodesEmit.cpp
unnecessary. Derived from a patch by Jakob Stoklund Olesen.

llvm-svn: 69635

broadcasted vector constants.

llvm-svn: 69634

llvm-svn: 69633

GEP's don't usually become instructions.

llvm-svn: 69631

llvm-svn: 69630

  clang: error: unable to make temporary file: /etc/cc: can't make
  unique filename: Permission denied

instead of 

  clang: error: unable to make temporary file: /etc/cc: can't make
  unique filenamePermission denied

for example.

Also, audited the uses of MakeErrMsg to make the prefix strings
consistent (not end with newline/punctuation/space/": ").

llvm-svn: 69626

llvm-svn: 69624

in the MachineFunction class, renaming it to addLiveIn for consistency with
the same method in MachineBasicBlock.  Thanks for Anton for suggesting this.

llvm-svn: 69615

llvm-svn: 69613

llvm-svn: 69610

llvm-svn: 69607

- Find more reloads from SS.

llvm-svn: 69606

llvm-svn: 69605

now that errs() is properly non-buffered.

llvm-svn: 69602

llvm-svn: 69599

which include Functions, where it can be quite useful to use an
AssemblyAnnotationWriter.

llvm-svn: 69598

64 bit platforms when building with optimization.
So replace them by a hand-coded implementation.
This fixes PR3822.

llvm-svn: 69597