Allow the aggressive anti-dep breaker to process the same region multiple times. This is necessary because new anti-dependencies are exposed when "current" ones are broken.

llvm-svn: 85166

the loop exiting block dominates the latch block; if ScalarEvolution
can prove that the trip-count is finite, that's sufficient.

llvm-svn: 85165

can safely use the NSW bit on the Add.

llvm-svn: 85164

llvm-svn: 85163

llvm-svn: 85162

llvm-svn: 85161

through the crack.

llvm-svn: 85160

aggressive on PHI instructions.

llvm-svn: 85158

to clamp at 0 bytes left.  WIP.

llvm-svn: 85157

llvm-svn: 85154

binary operators.

llvm-svn: 85153

llvm-svn: 85152

llvm-svn: 85149

llvm-svn: 85148

-Wno-missing-field-initializers or -Wno-variadic-macros.

llvm-svn: 85147

llvm-svn: 85146

Add aggressive anti-dependence breaker. Currently it is not the default for any target. Enable with -break-anti-dependencies=all.

llvm-svn: 85145

GEPs (more than one non-zero index) into simple GEPs (at most one
non-zero index).  In some simple experiments using this it's not
uncommon to see 3% overall code size wins, because it exposes
redundancies that can be eliminated, however it's tricky to use
because instcombine aggressively undoes the work that this pass does.

llvm-svn: 85144

llvm-svn: 85141

llvm-svn: 85140

llvm-svn: 85138

for consistency with ConstantFolder.

llvm-svn: 85137

llvm-svn: 85136

machineinstr whether the aliased register is dead, rather than the original
register is dead. This allows it to get the correct answer when examining
an instruction like this:
  CALLpcrel32 <ga:foo>, %AL<imp-def>, %EAX<imp-def,dead>
where EAX is dead but a subregister of it is still live. This fixes PR5294.

llvm-svn: 85135

llvm-svn: 85134

llvm-svn: 85133

llvm-svn: 85132

llvm-svn: 85131

llvm-svn: 85130

llvm-svn: 85129

llvm-svn: 85128

llvm-svn: 85127

Patch by Talin!

llvm-svn: 85126

llvm-svn: 85125

llvm-svn: 85120

All of the 'demorgan' related xforms need to use 
dyn_castNotVal, not m_Not.

llvm-svn: 85119

strides for now, because it doesn't handle them correctly. This fixes a
miscompile of SingleSource/Benchmarks/Misc-C++/ray.

This problem was usually hidden because indvars transforms such induction
variables into negations of canonical induction variables.

llvm-svn: 85118

llvm-svn: 85117

llvm-svn: 85116

warnings. Eventually we need a way to import externally defined functions
summaries.

llvm-svn: 85092