Real fix for PR3549, by using caching for predecessor counts in addition to the predecessors themselves.  This halves the time
to optimize the testcase, beyond what my previous patch did.

llvm-svn: 69792

llvm-svn: 69791

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