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125 Commits

Author SHA1 Message Date
Evan Cheng
9efce638d3 Allow copyRegToReg to emit cross register classes copies. 
Tested with "make check"!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42346 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-09-26 06:25:56 +00:00
Dan Gohman
92dfe2001e Remove isReg, isImm, and isMBB, and change all their users to use 
isRegister, isImmediate, and isMachineBasicBlock, which are equivalent,
and more popular.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41958 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-09-14 20:33:02 +00:00
David Greene
04fa32f9aa Add instruction dump output. This helps find bugs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41744 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-09-06 16:36:39 +00:00
Evan Cheng
90a43c3ae3 If the source of a move is in spill slot, the reload may be folded to essentially a load from stack slot. It's ok to mark the stack slot value as available for reuse. But it should not be clobbered since the destination of the move is live. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41109 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-08-15 20:20:34 +00:00
Evan Cheng
b6ca4b370e - If a def is dead, do not spill it. 
- If the defs of a spilled rematerializable MI are dead after the spill store is deleted, delete
  the def MI as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41086 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-08-14 23:25:37 +00:00
Evan Cheng
c91f0b8068 If a MI's def is remat as well as spilled, and the store is later deemed dead, mark the def operand as isDead. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41083 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-08-14 20:23:13 +00:00
Evan Cheng
fff3e191b9 If a spilled value is being reused and the use is a kill, that means there are 
no more uses within the MBB and the spilled value isn't live out of the MBB.
Then it's safe to delete the spill store.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41069 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-08-14 09:11:18 +00:00
Evan Cheng
dc6be19859 If a rematerializable def is not deleted, i.e. it is also spilled, check if the 
spilled value is available for reuse.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41067 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-08-14 05:42:54 +00:00
Evan Cheng
549f27d307 Re-implement trivial rematerialization. This allows def MIs whose live intervals that are coalesced to be rematerialized. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41060 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-08-13 23:45:17 +00:00
Evan Cheng
28bb462d4c Missed a couple of places where new instructions are added due to spill / restore. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@39748 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-07-11 19:17:18 +00:00
Evan Cheng
b9591c667d No longer need to track last def / use. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38534 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-07-11 08:47:44 +00:00
Evan Cheng
0c40d72b01 Fix for PR1545: Revamp code that update kill information due to register reuse. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38525 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-07-11 05:28:39 +00:00
Dan Gohman
82a87a0172 Replace M_REMATERIALIZIBLE and the newly-added isOtherReMaterializableLoad 
with a general target hook to identify rematerializable instructions. Some
instructions are only rematerializable with specific operands, such as loads
from constant pools, while others are always rematerializable. This hook
allows both to be identified as being rematerializable with the same
mechanism.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37644 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-19 01:48:05 +00:00
Dan Gohman
c101e95cb6 Add a target hook to allow loads from constant pools to be rematerialized, and an 
implementation for x86.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37576 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-14 20:50:44 +00:00
Evan Cheng
faa510726f Rename findRegisterUseOperand to findRegisterUseOperandIdx to avoid confusion. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36483 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-04-26 19:00:32 +00:00
Evan Cheng
6c087e5585 Match MachineFunction::UsedPhysRegs changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36452 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-04-25 22:13:27 +00:00
Evan Cheng
9193514e2e Re-materialize all loads from fixed stack slots. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35660 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-04-04 07:40:01 +00:00
Evan Cheng
7cb33c8652 Don't add the same MI to register reuse "last def/use" twice if it reads the 
register more than once.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35513 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-30 20:21:35 +00:00
Evan Cheng
018d6e1537 Don't call getOperandConstraint() if operand index is greater than 
TID->numOperands.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35375 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-27 00:48:28 +00:00
Evan Cheng
ad7ccf34b5 Fix for PR1266. Don't mark a two address operand IsKill. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35365 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-26 22:40:42 +00:00
Evan Cheng
2638e1a6b9 First cut trivial re-materialization support. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35208 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-20 08:13:50 +00:00
Evan Cheng
a7288df62d Only propagate IsKill if the last use is a kill. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34878 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-03 06:32:37 +00:00
Evan Cheng
6b448092bf - Keep track all def and uses of stack slot available in register. 
- Available value use may be deleted (e.g. noop move).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34841 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-02 08:52:00 +00:00
Evan Cheng
c3dd314b78 Invalidate last use of a reused register if the use is a deleted noop copy. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34839 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-02 05:41:42 +00:00
Evan Cheng
c0ba1bc49b A restore is promoted to copy (or deleted entirely), remove the kill from the last use of the targetted register. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34773 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-01 02:27:30 +00:00
Evan Cheng
de4e942faa A couple of more places where a register liveness has been extended and its last kill should be updated accordingly. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34597 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-25 09:51:27 +00:00
Evan Cheng
50d25d7ff7 Reuse extends the liveness of a register. Transfer the kill to the operand that reuse it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34536 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-23 21:47:50 +00:00
Evan Cheng
91e2390818 A spill kills the register being stored. But it is later being reused by spiller, its live range has to be extended. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34517 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-23 01:13:26 +00:00
Evan Cheng
957840b3e1 Use BitVector instead. No functionality change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34460 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-21 02:22:03 +00:00
Evan Cheng
667089de04 Dead code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34435 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-20 01:29:10 +00:00
Evan Cheng
f50d09ad21 Fixed a long standing spiller bug that's exposed by Thumb: 
The code sequence before the spiller is something like:
                 = tMOVrr
        %reg1117 = tMOVrr
        %reg1078 = tLSLri %reg1117, 2

The it starts spilling:
        %r0 = tRestore <fi#5>, 0
        %r1 = tRestore <fi#7>, 0
        %r1 = tMOVrr %r1<kill>
        tSpill %r1, <fi#5>, 0
        %reg1078 = tLSLri %reg1117, 2

It restores the value while processing the first tMOVrr. At this point, the
spiller remembers fi#5 is available in %r0. Next it processes the second move.
It restores the source before the move and spills the result afterwards. The
move becomes a noop and is deleted. However, a spill has been inserted and that
should invalidate reuse of %r0 for fi#5 and add reuse of %r1 for fi#5.
Therefore, %reg1117 (which is also assigned fi#5) should get %r1, not %r0.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34039 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-08 06:04:54 +00:00
Chris Lattner
08a4d5a343 Switch this to use SmallSet to avoid mallocs in the common case. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33457 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-01-23 00:59:48 +00:00
Evan Cheng
3c82cab9aa GetRegForReload() now keeps track which registers have been considered and rejected during its quest to find a suitable reload register. This avoids an infinite loop in case like this: 
t1 := op t2, t3
  t2 <- assigned r0 for use by the reload but ended up reuse r1
  t3 <- assigned r1 for use by the reload but ended up reuse r0
  t1 <- desires r1
        sees r1 is taken by t2, tries t2's reload register r0
        sees r0 is taken by t3, tries t3's reload register r1
        sees r1 is taken by t2, tries t2's reload register r0 ...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33382 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-01-19 22:40:14 +00:00
Chris Lattner
cd3245ac45 Eliminate static ctors from Statistics 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32698 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-19 22:41:21 +00:00
Bill Wendling
5c7e326585 Added an automatic cast to "std::ostream*" etc. from OStream. We then can 
rework the hacks that had us passing OStream in. We pass in std::ostream*
instead, check for null, and then dispatch to the correct print() method.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32636 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-17 05:15:13 +00:00
Evan Cheng
86facc2828 Minor clean up. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32593 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-15 06:41:01 +00:00
Evan Cheng
7a0d51c8e3 Fix a long-standing spiller bug: 
If a spillslot value is available in a register, and there is a noop copy that
targets that register, the spiller correctly decide not to invalidate the
spillslot register.

However, even though the noop copy does not clobbers the value. It does start a
new intersecting live range. That means the spillslot register is available for
use but should not be reused for a two-address instruction modref operand which
would clobber the new live range.

When we remove the noop copy, update the available information by clearing the
canClobber bit.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32576 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-14 07:54:05 +00:00
Evan Cheng
cc22a7a2ad Move findTiedToSrcOperand to TargetInstrDescriptor. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32366 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-08 18:45:48 +00:00
Evan Cheng
5c2a46052b Proper fix for PR1037: to determine is a VR is a modref, check 1) whether it is 
tied to another oeprand, 2) whether is is being tied to by another operand. So
the destination operand of a two-address MI can be correctly identified.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32354 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-08 08:02:34 +00:00
Reid Spencer
fe46361719 Revision 1.83 causes PR1037. 
Reverted.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32305 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-07 16:21:19 +00:00
Bill Wendling
e81561909d Changed llvm_ostream et all to OStream. llvm_cerr, llvm_cout, llvm_null, are 
now cerr, cout, and NullStream resp.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32298 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-07 01:30:32 +00:00
Evan Cheng
51cdcd1972 MI keeps a ptr of TargetInstrDescriptor, use it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32296 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-07 01:21:59 +00:00
Evan Cheng
6065f66e7c getOperandConstraint returns -1 if the operand does have the specific constraint. This bug was causing excessive spills. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32295 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-07 00:46:04 +00:00
Chris Lattner
ac0b6ae358 Detemplatize the Statistic class. The only type it is instantiated with 
is 'unsigned'.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32279 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-06 17:46:33 +00:00
Evan Cheng
ba59a1e453 Match TargetInstrInfo changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32098 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-01 21:52:58 +00:00
Bill Wendling
b2b9c20b61 More removal of std::cerr and DEBUG, replacing with DOUT instead. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31806 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-17 02:09:07 +00:00
Evan Cheng
e077ef6e85 Fixed some spiller bugs exposed by the recent two-address code changes. Now 
there may be other def(s) apart from the use&def two-address operand. We need
to check if the register reuse for a use&def operand may conflicts with another
def. Provide a mean to recover from the conflict if it is detected when the
defs are processed later.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31439 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-04 00:21:55 +00:00
Evan Cheng
e6ae14e1f4 Rename 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31364 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-01 23:18:32 +00:00
Evan Cheng
360c2dd25a Two-address instructions no longer have to be A := A op C. Now any pair of dest / src operands can be tied together. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31363 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-01 23:06:55 +00:00
Chris Lattner
6ec3626be4 restore my previous patch, now that the X86 backend bug has been fixed: 
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20061009/038518.html


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30906 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-10-12 17:45:38 +00:00