Evan Cheng 9fe2009956 Sorry, several patches in one. ... TargetInstrInfo: Change produceSameValue() to take MachineRegisterInfo as an optional argument. When in SSA form, targets can use it to make more aggressive equality analysis. Machine LICM: 1. Eliminate isLoadFromConstantMemory, use MI.isInvariantLoad instead. 2. Fix a bug which prevent CSE of instructions which are not re-materializable. 3. Use improved form of produceSameValue. ARM: 1. Teach ARM produceSameValue to look pass some PIC labels. 2. Look for operands from different loads of different constant pool entries which have same values. 3. Re-implement PIC GA materialization using movw + movt. Combine the pair with a "add pc" or "ldr [pc]" to form pseudo instructions. This makes it possible to re-materialize the instruction, allow machine LICM to hoist the set of instructions out of the loop and make it possible to CSE them. It's a bit hacky, but it significantly improve code quality. 4. Some minor bug fixes as well. With the fixes, using movw + movt to materialize GAs significantly outperform the load from constantpool method. 186.crafty and 255.vortex improved > 20%, 254.gap and 176.gcc ~10%. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123905 91177308-0d34-0410-b5e6-96231b3b80d8		2011-01-20 08:34:58 +00:00
..
2007-01-31-RegInfoAssert.ll
2007-02-02-JoinIntervalsCrash.ll
2007-03-06-AddR7.ll
2007-05-05-InvalidPushPop.ll
2009-06-18-ThumbCommuteMul.ll
2009-07-19-SPDecBug.ll
2009-07-20-TwoAddrBug.ll
2009-07-27-PEIAssert.ll
2009-08-12-ConstIslandAssert.ll
2009-08-12-RegInfoAssert.ll
2009-08-20-ISelBug.ll
2009-12-17-pre-regalloc-taildup.ll
2010-01-15-local-alloc-spill-physical.ll
2010-04-07-DbgValueOtherTargets.ll	If dbg_declare() or dbg_value() is not lowered by isel then emit DEBUG message instead of creating DBG_VALUE for undefined value in reg0.	2010-12-06 22:39:26 +00:00
2010-06-18-SibCallCrash.ll
2010-07-01-FuncAlign.ll
2010-07-15-debugOrdering.ll
2011-EpilogueBug.ll	Spill R4 if it's going to be used to restore SP from FP.	2011-01-16 05:14:33 +00:00
asmprinter-bug.ll
barrier.ll
dg.exp
dyn-stackalloc.ll
fpconv.ll
fpow.ll
frame_thumb.ll
iabs.ll
inlineasm-imm-thumb.ll
ispositive.ll
large-stack.ll	Thumb1 had two patterns for the same load-from-constant-pool instruction.	2010-12-15 23:52:36 +00:00
ldr_ext.ll
ldr_frame.ll
long_shift.ll
long-setcc.ll
long.ll
mul.ll
pop.ll
push.ll
select.ll
stack-frame.ll
thumb-imm.ll
trap.ll
tst_teq.ll
unord.ll
vargs.ll