PHI elimination should not break back edge. It can cause some significant code placement issues. rdar://8263994

good:
LBB0_2:
  mov     r2, r0
  . . .
  mov     r1, r2
  bne     LBB0_2

bad:
LBB0_2:
  mov     r2, r0
  . . .
@ BB#3:
  mov     r1, r2
  b       LBB0_2

llvm-svn: 111221

and optional def operands are handled in the backend support.

llvm-svn: 111220

llvm-svn: 111219

llvm-svn: 111214

llvm-svn: 111213

llvm-svn: 111212

llvm-svn: 111210

llvm-svn: 111208

llvm-svn: 111206

llvm-svn: 111201

llvm-svn: 111200

a Pass abstraction, since that's the level it's actually used at.
Rename Pass' dumpPassStructure to dumpPass.

This eliminates an awkward use of getAsPass() to convert a PMDataManager*
into a Pass* just to permit a dumpPassStructure call.

llvm-svn: 111199

mapping. Have the local block track its alignment requirement, and then
apply that when the block itself is allocated. Previously, offsets could
get adjusted in PEI to be different, relative to one another, than the
block allocation thought they would be, which defeats the point of doing
the allocation this way. Continuing rdar://8277890

llvm-svn: 111197

that the high halfword is zero.  The shift need not be exactly 16 bits.

llvm-svn: 111196

llvm-svn: 111195

make its constructor protected.

llvm-svn: 111193

llvm-svn: 111192

PMTopLevelManager's constructor take a PMDataManager *, which already
provides the needed abstraction support.

llvm-svn: 111189

llvm-svn: 111185

llvm-svn: 111183

llvm-svn: 111182

emission.

llvm-svn: 111177

llvm-svn: 111175

I forgot to add these files in commit 111172.

llvm-svn: 111174

llvm-svn: 111173

llvm-svn: 111172

Introduce a helper method to add a section to the end of a layout. This
will be used by the ELF ObjectWriter code to add the metadata sections
(symbol table, etc) to the end of an object file.

llvm-svn: 111171

llvm-svn: 111170

Some ELF sections contain fixed-sized entries. Provide a way to record
the entry size of a section.

llvm-svn: 111169

instructions besides saturate instructions.  No functional changes.

llvm-svn: 111168

clang says is unused.

llvm-svn: 111167

llvm-svn: 111164

expression being loop invariant is not equivalent to the property of
properly dominating the loop header.

Other optimizations have also made this optimization less important.

llvm-svn: 111160

llvm-svn: 111156

llvm-svn: 111155

llvm-svn: 111154

llvm-svn: 111153

llvm-svn: 111152

middle, copy the elements in two groups, rather than copying all the
elements and then doing an erase on the middle of the result. These
are SmallVectors, so we shouldn't expect to hit dynamic allocation
in the common case.

llvm-svn: 111151

llvm-svn: 111149