makes getLeader() nonrecursive.

llvm-svn: 122811

This ensures that always the recently compiled tools are picked for testing.

llvm-svn: 122810

llvm-svn: 122809

llvm-svn: 122808

when safe.

The testcase is basically this nested loop:
void foo(char *X) {
  for (int i = 0; i != 100; ++i) 
    for (int j = 0; j != 100; ++j)
      X[j+i*100] = 0;
}

which gets turned into a single memset now.  clang -O3 doesn't optimize
this yet though due to a phase ordering issue I haven't analyzed yet.

llvm-svn: 122806

instruction *after* the store.  The store will always be deleted
if the transformation kicks in, so we'd do an N^2 scan of every
loop block.  Whoops.

llvm-svn: 122805

spent in StrongPHIElimination on 403.gcc.

llvm-svn: 122803

CodeGenPrepare (which is the default behavior).

llvm-svn: 122801

Don't pattern match "/clang" so we don't mangle directory names.  Some
tests use absolute paths to clang.

llvm-svn: 122796

llvm-svn: 122795

llvm-svn: 122794

FunctionPass. It probably doesn't have a reason to be a LoopPass, as it will
probably drop the simple fixed point and either use RPO iteration or Duncan's
approach in instsimplify of only revisiting instructions that have changed.

The next step is to preserve LoopSimplify. This looks like it won't be too hard,
although the pass manager doesn't actually seem to respect when non-loop passes
claim to preserve LCSSA or LoopSimplify. This will have to be fixed.

llvm-svn: 122791

stop setting NSW: signed overflow is possible.  Thanks to Dan
for pointing these out.

llvm-svn: 122790

llvm-svn: 122789

llvm-svn: 122788

Use the new addEscapingValue callback to update GlobalsModRef when GVN adds PHIs of GEPs. For the moment,
have GlobalsModRef handle this conservatively by simply removing the value from its maps.

llvm-svn: 122787

llvm-svn: 122786

invalidated by stores, so they can be handled as 'simple'
operations.

llvm-svn: 122785

prologue and epilogue if the adjustment is 8. Similarly, use pushl / popl if
the adjustment is 4 in 32-bit mode.

In the epilogue, takes care to pop to a caller-saved register that's not live
at the exit (either return or tailcall instruction).
rdar://8771137

llvm-svn: 122783

Don't pattern match "clang-" as it may be part of a tool name with a
triple suffix.

llvm-svn: 122779

llvm-svn: 122778

a pointer value has potentially become escaping.  Implementations can choose to either fall back to
conservative responses for that value, or may recompute their analysis to accomodate the change.

llvm-svn: 122777

llvm-svn: 122773

exposed.  It turns out to be a latent bug in basicaa, scary.

llvm-svn: 122772

llvm-svn: 122771

(clang/include/clang/Basic/StmtNodes.td, for instance, is tablegenned
from clang/include/clang/AST/CMakeLists.txt) so it is not contained on
the list of all .td files on the current source directory which is
used as the DEPENDS of the custom command. We must add the .td file to
the DEPENDS list of the custom command. Otherwise some .inc files are
not regenerated when the corresponding .td file changes.

llvm-svn: 122768

almost-but-not-quite-identical code.  No intended functionality change.

llvm-svn: 122760

that are allowed to have metadata operands are intrinsic calls,
and the only ones that take metadata currently return void.
Just reject all void instructions, which should not be value
numbered anyway.  To future proof things, add an assert to the
getHashValue impl for calls to check that metadata operands 
aren't present.

llvm-svn: 122759

nested values, so they can change and drop to null, which can
change the hash and cause havok.

It turns out that it isn't a good idea to value number stuff
with metadata operands anyway, so... don't.

llvm-svn: 122758

Reapply 122341 to fix PR8199 now that clang changes are in.

llvm-svn: 122754

the benefit of project-based generators (VS, XCode, etc).

llvm-svn: 122749

InstructionSimplify on instructions that didn't change since the
last time round the loop.

llvm-svn: 122745

llvm-svn: 122743

capacity on the Visited SmallPtrSet. On 403.gcc, this is about a 4.5% speedup of
CodeGenPrepare time (which itself is 10% of time spent in the backend).

This is progress towards PR8889.

llvm-svn: 122741

improvement in the generated code, and speeds up 'opt -std-compile-opts'
compile time on 176.gcc from 24.84s to 23.2s (about 7%).

This also resolves a specific code quality issue in rdar://7352081 which
was generating poor code for:

int t(int a, int b) {
  if (a & b & 1)
    return a & b;
  return 3;
}

llvm-svn: 122740

The rationale is that after analyzing a function in the SCC, we may want to
modify it in a way that requires us to update its uses (f.e. to replace the
call with a constant) or its users (f.e. to call it with fewer arguments).

llvm-svn: 122739

elimination as well.  This deletes 60 stores in 176.gcc
that largely come from bitfield code.

llvm-svn: 122736

a 28% speedup of MachineCSE time on 403.gcc.

llvm-svn: 122735

in their SCC as they already have with the direct callees.

llvm-svn: 122734

speeding earlycse up by 6%.

llvm-svn: 122733