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5405 Commits

Author SHA1 Message Date
Dan Gohman
74fa421281 Re-enable elimination of unnecessary SUBREG_TO_REG instructions in 
LowerSubregs, and fix an x86-64 isel bug that this exposed.

SUBREG_TO_REG for x86-64 implicit zero extension is only safe for
isel to generate when the source is known to always have zeros in
the high 32 bits. The EXTRACT_SUBREG instruction does not clear
the high 32 bits.

llvm-svn: 54444
 2008-08-07 02:54:50 +00:00
Evan Cheng
f8a801a9b8 Factor code that finalize PHI nodes, jump tables, etc. out of SelectBasicBlock. No functionality changes. 
llvm-svn: 54438
 2008-08-07 00:43:25 +00:00
Owen Anderson
2975ced4df SDISel's constant branch folding can fold away self-loops, which doesn't result in any dead blocks, but 
rather an incorrect phi input.  Add code to UnreachableMachineBlockElim to get rid of these entries.

llvm-svn: 54432
 2008-08-06 23:16:52 +00:00
Owen Anderson
655eb1a3bc Correct handle cases where two phis are coalesced together, and correct break up the case where two different 
phis want to coalesce with the same vreg.

llvm-svn: 54426
 2008-08-06 22:08:58 +00:00
Owen Anderson
33cf898dff Oops, didn't mean to commit this. 
llvm-svn: 54425
 2008-08-06 20:58:38 +00:00
Owen Anderson
5929d57f67 We don't need to try to coalesce input vregs that are the same as the output vreg. 
llvm-svn: 54422
 2008-08-06 20:29:20 +00:00
Owen Anderson
482d679301 Only trim a live interval if the register is not used after the PHI node. 
llvm-svn: 54421
 2008-08-06 18:36:17 +00:00
Owen Anderson
e95b75bed2 Only remap each VNInfo once when doing renumbering. 
llvm-svn: 54420
 2008-08-06 18:35:45 +00:00
Owen Anderson
e9c3ae9fe4 Fix breakage on ARM/2008-04-10-ScavengerAssert.ll. 
llvm-svn: 54378
 2008-08-05 22:24:40 +00:00
Evan Cheng
a07795a0c3 Fix PR2596: out of bound reference. 
llvm-svn: 54375
 2008-08-05 21:51:46 +00:00
Owen Anderson
acd5487eb9 Correctly handle replacement and removal of PHIs with one incoming register. 
llvm-svn: 54374
 2008-08-05 21:40:45 +00:00
Owen Anderson
11731063b9 Oops, we were already checking for dead phis. Handle this the proper way, then. 
llvm-svn: 54371
 2008-08-05 21:18:51 +00:00
Owen Anderson
dacdf44612 We don't need to update live intervals for dead PHIs. 
llvm-svn: 54369
 2008-08-05 20:51:26 +00:00
Owen Anderson
667d9c95c2 Remove the -disable-correct-folding option, which was ugly and is no longer needed. 
llvm-svn: 54361
 2008-08-05 18:27:54 +00:00
Dan Gohman
de163bb39d Fix several const-correctness issues, resolving some -Wcast-qual warnings. 
llvm-svn: 54349
 2008-08-05 14:45:15 +00:00
Evan Cheng
1b731b8504 Remove #if 0. 
llvm-svn: 54347
 2008-08-05 07:20:57 +00:00
Evan Cheng
754148a2ec Fix PR2568: Fix bug that cause redudant kill marker after its live interval has been extended due to coalescing. 
llvm-svn: 54346
 2008-08-05 07:10:38 +00:00
Owen Anderson
7b5fe60440 Remove unneeded iteration. Thanks to Dan for the feedback. 
llvm-svn: 54337
 2008-08-05 00:30:10 +00:00
Owen Anderson
32ae9380f1 This option doesn't need to be a target option. It can be in SDISel instead. 
llvm-svn: 54336
 2008-08-05 00:27:28 +00:00
Owen Anderson
84fbc312d4 - Fix SelectionDAG to generate correct CFGs. 
- Add a basic machine-level dead block eliminator.

These two have to go together, since many other parts of the code generator are unable to handle the unreachable blocks otherwise created.

llvm-svn: 54333
 2008-08-04 23:54:43 +00:00
Dan Gohman
60ea311ec8 Fix SDISel lowering of PHI nodes to use ComputeValueVTs. 
This allows it to work correctly on aggregate values.
This fixes PR2623.

llvm-svn: 54331
 2008-08-04 23:42:46 +00:00
Dan Gohman
af429b3e52 Fix SDISel lowering of zeroinitializer and undef to use ComputeValueVTs. 
This allows it to work correctly on nested aggregate values.
This fixes PR2625.

llvm-svn: 54330
 2008-08-04 23:30:41 +00:00
Dale Johannesen
f669e7c14f Add a flag to disable jump table generation (all 
switches use the binary search algorithm) for
environments that don't support it.  PPC64 JIT
is such an environment; turn the flag on for that.

llvm-svn: 54248
 2008-07-31 18:13:12 +00:00
Dan Gohman
f691fc703d Improve dagcombining for sext-loads and sext-in-reg nodes. 
llvm-svn: 54239
 2008-07-31 00:50:31 +00:00
Dan Gohman
926a91d664 Move SelectionDAG::viewGraph() out of line; as an inline function 
it isn't always visible to gdb.

llvm-svn: 54228
 2008-07-30 18:48:53 +00:00
Dan Gohman
4ca56a8993 Don't look for leaf values to store when lowering stores of 
empty structs. This fixes PR2612.

llvm-svn: 54226
 2008-07-30 18:36:51 +00:00
Owen Anderson
4e5db8d80f Use existing LiveInterval methods to simplify live interval merging. Thanks to Evan for pointing these out. 
llvm-svn: 54225
 2008-07-30 18:27:35 +00:00
Owen Anderson
e6dca3efcb Value numbers whose def index is a special sentinel value should not be remapped. 
llvm-svn: 54218
 2008-07-30 17:42:47 +00:00
Owen Anderson
377ad6cb31 More fixes for corner cases when remapping live range indices. 
llvm-svn: 54186
 2008-07-30 00:22:56 +00:00
Owen Anderson
6147af0f8c When merging live intervals, we also need to merge in any live ranges that are inputs to two-address instructions 
that themselves define a range we already care about.

llvm-svn: 54185
 2008-07-30 00:21:16 +00:00
Owen Anderson
ab575176fc When merging a PHI operand's live interval into the PHI's live interval, we need to merge over all liveranges in 
the operand's interval that share the relevant value number, not just the range that immediately precedes the PHI.

llvm-svn: 54174
 2008-07-29 21:17:08 +00:00
Owen Anderson
bebb8e5d20 Don't decrement the BB remap when we don't need to. 
llvm-svn: 54173
 2008-07-29 21:15:44 +00:00
Duncan Sands
c3d73fbfc0 Fix PR2609. If a label is deleted, then it needs 
to be marked invalid regardless of whether it is
a debug, an exception handling or (hopefully) a
GC label.

llvm-svn: 54172
 2008-07-29 20:56:02 +00:00
Nate Begeman
f76a814673 Fix broken CellSPU lowering, re-instate braces in Legalize 
llvm-svn: 54168
 2008-07-29 19:07:27 +00:00
Nate Begeman
20b060cd54 Disable a fix in the previous patch, since it breaks CellSPU. 
The CellSPU codegen is broken, but needs to be fixed before we can
put this back in.

llvm-svn: 54164
 2008-07-29 18:28:31 +00:00
Nate Begeman
9a71580e21 Add vector shifts to the IR, patch by Eli Friedman. 
CodeGen & Clang work coming next.

llvm-svn: 54161
 2008-07-29 15:49:41 +00:00
Dan Gohman
9653b21dc2 Fold the useful features of alist and alist_node into ilist, and 
a new ilist_node class, and remove them. Unlike alist_node,
ilist_node doesn't attempt to manage storage itself, so it avoids
the associated problems, including being opaque in gdb.

Adjust the Recycler class so that it doesn't depend on alist_node.
Also, change it to use explicit Size and Align parameters, allowing
it to work when the largest-sized node doesn't have the greatest
alignment requirement.

Change MachineInstr's MachineMemOperand list from a pool-backed
alist to a std::list for now.

llvm-svn: 54146
 2008-07-28 21:51:04 +00:00
Dan Gohman
f6391108c6 Fix a typo in a comment. 
llvm-svn: 54136
 2008-07-28 18:43:51 +00:00
Dan Gohman
6bfdeb2ed1 Make the ScheduleDAG's GraphRoot edge be blue and dashed too, like 
the SelectionDAG's.

llvm-svn: 54129
 2008-07-27 22:46:49 +00:00
Dan Gohman
9742f7772d Rename SDOperand to SDValue. 
llvm-svn: 54128
 2008-07-27 21:46:04 +00:00
Dan Gohman
47c5cdbc34 Tidy SDNode::use_iterator, and complete the transition to have it 
parallel its analogue, Value::value_use_iterator. The operator* method
now returns the user, rather than the use.

llvm-svn: 54127
 2008-07-27 20:43:25 +00:00
Dan Gohman
2a0bc8f6e1 Rename isOnlyUseOf to isOnlyUserOf. 
llvm-svn: 54124
 2008-07-27 18:06:42 +00:00
Duncan Sands
545c21768f Some binary operations were being treated as 
unary operations!  Add support for softening
some additional unary operations like fp_to_sint.

llvm-svn: 54122
 2008-07-27 12:28:43 +00:00
Owen Anderson
25a3bf3f0e Fix the issues originally addressed in r54070. After thinking about it some more, I realized that the right thing to do 
is to have StrongPHIElimination use its knowledge of the PHIs before they're erased to update the intervals appropriate.  This is
both simpler and more accurate than the alternative, which was having LIA figure it out when it renumbered things, plus it's just
the right thing to do!

llvm-svn: 54077
 2008-07-25 23:38:08 +00:00
Owen Anderson
8f9ab550a2 Revert my previous patch. In retrospect, this is completely the wrong way to fix this problem. 
llvm-svn: 54072
 2008-07-25 23:06:59 +00:00
Owen Anderson
9408721750 Special cases are needed in renumbering when dealing with renumbering after a PHI has been removed. The interval previously defined 
by the PHI needs to be extended to the beginning of its basic block, and the intervals that were inputs need to be trimmed to the end 
of their basic blocks.

llvm-svn: 54070
 2008-07-25 22:32:01 +00:00
Owen Anderson
9e3ea5a60c In order to avoid reprocessing a register more than once, we need to add it 
to the handled set so it will get filtered out in future iterations.

llvm-svn: 54065
 2008-07-25 21:35:43 +00:00
Owen Anderson
987bd1dc5b Remove live interval entries for an interval if we're eliminating its only VN. 
llvm-svn: 54062
 2008-07-25 21:08:41 +00:00
Owen Anderson
fe97082ddd Properly remap live ranges whose end indices are the end of the function. 
llvm-svn: 54061
 2008-07-25 21:07:13 +00:00
Owen Anderson
cefa4df4c1 Make the remapping of interval indices (particularly ending indices) more robust. 
This is tricky business, and will probably take a few more iterations to get
the last kinks out of it.

llvm-svn: 54043
 2008-07-25 19:50:48 +00:00