then don't try to decimate it into its individual pieces.  This will just make a mess of the
IR and is pointless if none of the elements are individually accessed.  This was generating
really terrible code for std::bitset (PR8980) because it happens to be lowered by clang
as an {[8 x i8]} structure instead of {i64}.

The testcase now is optimized to:

define i64 @test2(i64 %X) {
  br label %L2

L2:                                               ; preds = %0
  ret i64 %X
}

before we generated:

define i64 @test2(i64 %X) {
  %sroa.store.elt = lshr i64 %X, 56
  %1 = trunc i64 %sroa.store.elt to i8
  %sroa.store.elt8 = lshr i64 %X, 48
  %2 = trunc i64 %sroa.store.elt8 to i8
  %sroa.store.elt9 = lshr i64 %X, 40
  %3 = trunc i64 %sroa.store.elt9 to i8
  %sroa.store.elt10 = lshr i64 %X, 32
  %4 = trunc i64 %sroa.store.elt10 to i8
  %sroa.store.elt11 = lshr i64 %X, 24
  %5 = trunc i64 %sroa.store.elt11 to i8
  %sroa.store.elt12 = lshr i64 %X, 16
  %6 = trunc i64 %sroa.store.elt12 to i8
  %sroa.store.elt13 = lshr i64 %X, 8
  %7 = trunc i64 %sroa.store.elt13 to i8
  %8 = trunc i64 %X to i8
  br label %L2

L2:                                               ; preds = %0
  %9 = zext i8 %1 to i64
  %10 = shl i64 %9, 56
  %11 = zext i8 %2 to i64
  %12 = shl i64 %11, 48
  %13 = or i64 %12, %10
  %14 = zext i8 %3 to i64
  %15 = shl i64 %14, 40
  %16 = or i64 %15, %13
  %17 = zext i8 %4 to i64
  %18 = shl i64 %17, 32
  %19 = or i64 %18, %16
  %20 = zext i8 %5 to i64
  %21 = shl i64 %20, 24
  %22 = or i64 %21, %19
  %23 = zext i8 %6 to i64
  %24 = shl i64 %23, 16
  %25 = or i64 %24, %22
  %26 = zext i8 %7 to i64
  %27 = shl i64 %26, 8
  %28 = or i64 %27, %25
  %29 = zext i8 %8 to i64
  %30 = or i64 %29, %28
  ret i64 %30
}

In this case, instcombine was able to eliminate the nonsense, but in PR8980 enough
PHIs are in play that instcombine backs off.  It's better to not generate this stuff
in the first place.

llvm-svn: 123571

of a constant.

llvm-svn: 123570

llvm-svn: 123569

multiple uses.  In some cases, all the uses are the same operation,
so instcombine can go ahead and promote the phi.  In the testcase
this pushes an add out of the loop.

llvm-svn: 123568

llvm-svn: 123567

first line of the function because it isn't a good idea, even for compares.

llvm-svn: 123566

llvm-svn: 123565

llvm-svn: 123564

of the stored value to the new store type is always.  Also, add a testcase.

llvm-svn: 123563

llvm-svn: 123562

llvm-svn: 123561

llvm-svn: 123560

multi-instruction sequences like calls.  Many thanks to Jakob for
finding a testcase.

llvm-svn: 123559

llvm-svn: 123558

Revert "Archive: Replace all internal uses of PathV1 with PathV2. The external API still uses PathV1."

llvm-svn: 123557

llvm-svn: 123556

it so the bots go green

llvm-svn: 123555

llvm-svn: 123554

llvm-svn: 123553

llvm-svn: 123552

llvm-svn: 123551

Support/GraphWriter: Replace all internal uses of PathV1 with PathV2. The external API still uses PathV1.

llvm-svn: 123550

llvm-svn: 123549

llvm-svn: 123548

http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel

In a silly microbenchmark on a 65 nm core2 this is 1.5x faster than the old
code in 32 bit mode and about 2x faster in 64 bit mode. It's also a lot shorter,
especially when counting 64 bit population on a 32 bit target.

I hope this is fast enough to replace Kernighan-style counting loops even when
the input is rather sparse.

llvm-svn: 123547

llvm-svn: 123546

llvm-svn: 123545

llvm-svn: 123544

llvm-svn: 123543

Add toCharUnitsInBits() to simplify the many calls to CharUnits::fromQuantity() of the form CharUnits::fromQuantity(bitSize, Context.getCharWidth()).

llvm-svn: 123542

opporuntities. Fixes PR8978.

llvm-svn: 123541

Patch by arrowdodger!

llvm-svn: 123539

llvm-svn: 123538

llvm-svn: 123537

Also, replace tabs with spaces. Yes, it's 2011.

llvm-svn: 123535

half a million non-local queries, each of which would otherwise have triggered a
linear scan over a basic block.

Also fix a fixme for memory intrinsics which dereference pointers. With this,
we prove that a pointer is non-null because it was dereferenced by an intrinsic
112 times in llvm-test.

llvm-svn: 123533

llvm-svn: 123531

llvm-svn: 123530

llvm-svn: 123529

realize that ConstantFoldTerminator doesn't preserve dominfo.

llvm-svn: 123527