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Author SHA1 Message Date
Chris Lattner
aaa7706cd5 fix PR5104: when printing a single character, return the result of 
putchar in case there is an error.

llvm-svn: 86515
 2009-11-09 04:57:04 +00:00
Chris Lattner
5a3a41a757 enhance PHI slicing to handle the case when a slicable PHI is begin 
used by a chain of other PHIs.

llvm-svn: 86503
 2009-11-09 01:38:00 +00:00
Owen Anderson
bbbb62a090 Small cleanups. 
llvm-svn: 86499
 2009-11-09 00:48:15 +00:00
Owen Anderson
7ac0e198c3 Revert my previous patch to ABCD and fix things the right way. There are two problems addressed 
here:

1) We need to avoid processing sigma nodes as phi nodes for constraint generation.
2) We need to generate constraints for comparisons against constants properly.

This includes our first working ABCD test!

llvm-svn: 86498
 2009-11-09 00:44:44 +00:00
Chris Lattner
fe6b17a13a comment typos pointed out by Duncan 
llvm-svn: 86497
 2009-11-09 00:41:49 +00:00
Owen Anderson
045615edfb Fix an issue where the ordering of blocks within a function could lead to different constraint 
graphs being produced.  The cause was that we were incorrectly marking sigma instructions as
processed after handling the sigma-specific constraints for them, potentially neglecting to
process them as normal instructions as well.

Unfortunately, the testcase that inspired this still doesn't work because of a bug in the solver,
which is next on the list to debug.

llvm-svn: 86486
 2009-11-08 22:36:55 +00:00
Chris Lattner
6c67b00026 Teach an instcombine to not pull trunc instructions through PHI nodes 
when both the source and dest are illegal types, since it would cause
the phi to grow (for example, we shouldn't transform test14b's phi to
a phi on i320).  This fixes an infinite loop on i686 bootstrap with
phi slicing turned on, so turn it back on.

llvm-svn: 86483
 2009-11-08 21:20:06 +00:00
Chris Lattner
11b6e3c1eb reapply r8644[3-5] with only the scary part 
(SliceUpIllegalIntegerPHI) disabled.

llvm-svn: 86480
 2009-11-08 19:23:30 +00:00
Daniel Dunbar
1543f2c26f Speculatively revert r8644[3-5], they seem to be leading to infinite loops in 
llvm-gcc bootstrap.

llvm-svn: 86478
 2009-11-08 17:52:47 +00:00
Chris Lattner
cddc8aa1b8 teach a couple of instcombine transformations involving PHIs to 
not turn a PHI in a legal type into a PHI of an illegal type, and
add a new optimization that breaks up insane integer PHI nodes into
small pieces (PR3451).

llvm-svn: 86443
 2009-11-08 08:21:13 +00:00
Nick Lewycky
2b3ac2b1a7 Improve tail call elimination to handle the switch statement. 
llvm-svn: 86403
 2009-11-07 21:10:15 +00:00
Chris Lattner
c6bb31e5ea make instcombine only rewrite a chain of computation 
(eliminating some extends) if the new type of the
computation is legal or if both the source and dest
are illegal.  This prevents instcombine from changing big
chains of computation into i64 on 32-bit targets for 
example.

llvm-svn: 86398
 2009-11-07 19:11:46 +00:00
Chris Lattner
15b00179d0 Revert r86359, it is breaking the self host on the 
llvm-gcc-i386-darwin9 build bot.

llvm-svn: 86391
 2009-11-07 17:59:32 +00:00
Nick Lewycky
80180a0497 Teach dead store elimination that certain intrinsics write to memory just like 
a store.

llvm-svn: 86359
 2009-11-07 08:34:40 +00:00
Chris Lattner
3482ad7de0 reapply 86289, 86278, 86270, 86267, 86266 & 86264 plus a fix 
(making pred factoring only happen if threading is guaranteed
to be successful).

This now survives an X86-64 bootstrap of llvm-gcc.

llvm-svn: 86355
 2009-11-07 08:05:03 +00:00
Nick Lewycky
f49c373c13 Oops, FunctionContainsEscapingAllocas is really used to mean two different 
things. Back out part of r86349 for a moment.

llvm-svn: 86353
 2009-11-07 07:42:38 +00:00
Nick Lewycky
a2b0965613 Dust off tail recursion elimination. Fix a fixme by applying CaptureTracking 
and add a .ll to demo the new capability.

llvm-svn: 86349
 2009-11-07 07:10:01 +00:00
Devang Patel
84b2af870e Revert following patches to fix llvmgcc bootstrap. 
86289, 86278, 86270, 86267, 86266 & 86264
Chris, please take a look.

llvm-svn: 86321
 2009-11-07 01:32:59 +00:00
Jeffrey Yasskin
66008446d5 Avoid "ambiguous 'else'" warning from gcc. 
llvm-svn: 86314
 2009-11-07 00:26:47 +00:00
Chris Lattner
411461dd99 Fix a bug where we'd call SplitBlockPredecessors with a pred in the 
set only once even if it has multiple edges to BB.

llvm-svn: 86299
 2009-11-06 23:19:58 +00:00
Eli Friedman
98daf610fb Remove function left over from other jump threading cleanup. 
llvm-svn: 86289
 2009-11-06 21:24:57 +00:00
Chris Lattner
93a3e74486 Fix a problem discovered on self host. 
llvm-svn: 86278
 2009-11-06 19:21:48 +00:00
Chris Lattner
17dc911808 remove more code subsumed by r86264 
llvm-svn: 86270
 2009-11-06 18:24:32 +00:00
Chris Lattner
8b677402d3 eliminate some more code subsumed by r86264 
llvm-svn: 86267
 2009-11-06 18:22:54 +00:00
Chris Lattner
79534a05af remove now redundant code, r86264 handles this case. 
llvm-svn: 86266
 2009-11-06 18:20:58 +00:00
Chris Lattner
b688868418 Extend jump threading to support much more general threading 
predicates.  This allows us to jump thread things like:

_ZN12StringSwitchI5ColorE4CaseILj7EEERS1_RAT__KcRKS0_.exit119:
  %tmp1.i24166 = phi i8 [ 1, %bb5.i117 ], [ %tmp1.i24165, %_Z....exit ], [ %tmp1.i24165, %bb4.i114 ] 
  %toBoolnot.i87 = icmp eq i8 %tmp1.i24166, 0     ; <i1> [#uses=1]
  %tmp4.i90 = icmp eq i32 %tmp2.i, 6              ; <i1> [#uses=1]
  %or.cond173 = and i1 %toBoolnot.i87, %tmp4.i90  ; <i1> [#uses=1]
  br i1 %or.cond173, label %bb4.i96, label %_ZN12...

Where it is "obvious" that when coming from %bb5.i117 that the 'and' is always 
false.  This triggers a surprisingly high number of times in the testsuite, 
and gets us closer to generating good code for doug's strswitch testcase.

This also make a bunch of other code in jump threading redundant, I'll rip
out in the next patch.  This survived an enable-checking llvm-gcc bootstrap.

llvm-svn: 86264
 2009-11-06 18:15:14 +00:00
Chris Lattner
6a31c1141c remove some more Context arguments. 
llvm-svn: 86235
 2009-11-06 05:59:53 +00:00
Chris Lattner
903ae55e1c remove a bunch of extraneous LLVMContext arguments 
from various APIs, addressing PR5325.

llvm-svn: 86231
 2009-11-06 04:27:31 +00:00
Dan Gohman
54aa68b309 Teach LSR to avoid calling SplitCriticalEdge on edges with indirectbr. 
llvm-svn: 86193
 2009-11-05 23:34:59 +00:00
Dan Gohman
6a3eefbfeb LoopDeletion depends on loops having dedicated exits. 
llvm-svn: 86180
 2009-11-05 21:47:04 +00:00
Dan Gohman
3c155aa3cd Update various Loop optimization passes to cope with the possibility that 
LoopSimplify form may not be available.

llvm-svn: 86175
 2009-11-05 21:11:53 +00:00
Dan Gohman
0c3b2f8419 Call getAnalysis<LoopInfo> the normal way, instead of asking passed-in 
LoopPassManager for it.

llvm-svn: 86163
 2009-11-05 19:43:25 +00:00
Benjamin Kramer
a38019a3de Teach SimplifyLibCalls to fold memcmp calls with constant arguments. 
llvm-svn: 86141
 2009-11-05 17:44:22 +00:00
Benjamin Kramer
f10e3edefb Do map insert+find in one step. TODO -= 2. 
llvm-svn: 86133
 2009-11-05 14:33:27 +00:00
Chris Lattner
a003aee613 improve DSE when TargetData is not around, based on work by 
Hans Wennborg!

llvm-svn: 86067
 2009-11-04 23:20:12 +00:00
Chris Lattner
4864198071 Fix an iterator invalidation bug that happens when a hashtable 
resizes in IPSCCP.  This fixes PR5394.

llvm-svn: 86036
 2009-11-04 18:57:42 +00:00
Chris Lattner
d8ab8fbe9f move two functions up higher in the file. Delete a useless argument 
to EmitGEPOffset.  

Implement some new transforms for optimizing 
subtracts of two pointer to ints into the same vector.  This happens
for C++ iterator idioms for example, stringmap takes a const char*
that points to the start and end of a string.  Once inlined, we want
the pointer difference to turn back into a length.

This is rdar://7362831.

llvm-svn: 86021
 2009-11-04 08:05:20 +00:00
Chris Lattner
b634c6cdb5 reimplement multiple return value handling in IPSCCP, making it 
more aggressive an correct.  This survives building llvm in 64-bit
mode with optimizations and the built llvm passes make check.

llvm-svn: 85973
 2009-11-03 23:40:48 +00:00
Chris Lattner
10c341e8fa finish half thunk thought 
llvm-svn: 85937
 2009-11-03 20:52:57 +00:00
Chris Lattner
2aa5962af6 fix an IPSCCP bug I introduced when I changed IPSCCP to start working on 
functions that don't have local linkage.  Basically, we need to be more
careful about propagating argument information to functions whose results
we aren't tracking.  This fixes a miscompilation of 
LLVMCConfigurationEmitter.cpp when built with an llvm-gcc that has ipsccp
enabled.

llvm-svn: 85923
 2009-11-03 19:24:51 +00:00
Chris Lattner
bfe755788f fix a subtle bug I introduced when refactoring SCCP. Testcase 
to follow.

llvm-svn: 85903
 2009-11-03 16:50:11 +00:00
Chris Lattner
b1dfdadabd turn IPSCCP back on now that the iterator invalidation bug is fixed. 
llvm-svn: 85858
 2009-11-03 03:42:51 +00:00
Chris Lattner
00c9eb665d fix a nasty iterator invalidation bug from my conversion from 
std::map to DenseMap, exposed on release llvm-gcc bootstrap.

llvm-svn: 85840
 2009-11-02 23:25:39 +00:00
Chris Lattner
6f515d4ba8 revert r8579[56], which are causing unhappiness in buildbot land. 
llvm-svn: 85818
 2009-11-02 19:31:10 +00:00
Chris Lattner
a1776913ab disable IPSCCP support for multiple return values, it is buggy, so just 
disable it until I can fix it.

llvm-svn: 85810
 2009-11-02 18:22:51 +00:00
Chris Lattner
f1afb57935 improve IPSCCP to be able to propagate the result of "!mayBeOverridden" 
function to calls of that function, regardless of whether it has local
linkage or has its address taken.  Not escaping should only affect 
whether we make an aggressive assumption about the arguments to a 
function, not whether we can track the result of it.

llvm-svn: 85795
 2009-11-02 07:33:59 +00:00
Chris Lattner
c9279a9b4d don't mark the arguments of prototype overdefined, they will never be queried. 
llvm-svn: 85793
 2009-11-02 06:34:04 +00:00
Chris Lattner
9c7e443b07 restore some code I removed in r85788, refactor it into 
a shared place instead of duplicating it 4 times.

llvm-svn: 85792
 2009-11-02 06:28:16 +00:00
Chris Lattner
23f5603692 remove some confused code that dates from when we had 
"multiple return values" but not "first class aggregates"

llvm-svn: 85791
 2009-11-02 06:17:06 +00:00
Chris Lattner
c670f866ce avoid redundant lookups in BBExecutable, and make it a SmallPtrSet. 
llvm-svn: 85790
 2009-11-02 06:11:23 +00:00
Chris Lattner
16b825e51f Use the libanalysis 'ConstantFoldLoadFromConstPtr' function 
instead of reinventing SCCP-specific logic.  This gives us
new powers.

llvm-svn: 85789
 2009-11-02 06:06:14 +00:00
Chris Lattner
32acebedf7 switch the main 'ValueState' map from being an std::map to being 
a DenseMap.  Doing this required being aware of subtle iterator
invalidation issues, but it provides a big speedup.  In a 
release-asserts build, this sped up optimizing 403.gcc from
1.34s -> 0.79s (IPSCCP) and 1.11s -> 0.44s (SCCP).

This commit also conflates in a bunch of general cleanups, sorry.

llvm-svn: 85788
 2009-11-02 05:55:40 +00:00
Chris Lattner
7e74831e52 only IPSCCP incoming arguments if the function is executable, this fixes 
an assertion on the buildbot.

llvm-svn: 85784
 2009-11-02 03:25:55 +00:00
Chris Lattner
0a8c553eb2 add a new ValueState::getConstantInt() helper, use it to 
simplify some code.

llvm-svn: 85783
 2009-11-02 03:21:36 +00:00
Chris Lattner
4372b58329 tidy up some more: remove some extraneous inline specifiers, return harder. 
llvm-svn: 85780
 2009-11-02 03:03:42 +00:00
Chris Lattner
1c8cb53667 eliminate the SCCPSolver::getValueMapping method. 
llvm-svn: 85778
 2009-11-02 02:54:24 +00:00
Chris Lattner
f02562df08 fix failures introduced in r85774 
llvm-svn: 85777
 2009-11-02 02:48:17 +00:00
Chris Lattner
d4f286cb0c factor duplicated code into a new DeleteInstructionInBlock 
function, eliminate temporary (and pointless) smallvector.

llvm-svn: 85776
 2009-11-02 02:47:51 +00:00
Chris Lattner
a806b18c99 Chris used to use '...' instead of proper grammar. 
llvm-svn: 85775
 2009-11-02 02:33:50 +00:00
Chris Lattner
37dc1cb0fb remove some extraneous llvmcontext stuff. 
llvm-svn: 85774
 2009-11-02 02:30:06 +00:00
Chris Lattner
28db47c45a change LatticeVal to use PointerIntPair to save some space. 
llvm-svn: 85773
 2009-11-02 02:20:32 +00:00
Chris Lattner
b94afb778c fix instcombine to only do store sinking when the alignments 
of the two loads agree.  Propagate that onto the new store.

llvm-svn: 85772
 2009-11-02 02:06:37 +00:00
Chris Lattner
f3c2039dde when merging two loads, make sure to take the min of their alignment, 
not the max.  This didn't matter until the previous patch because
instcombine would refuse to sink loads with differenting alignments.

llvm-svn: 85738
 2009-11-01 20:07:07 +00:00
Chris Lattner
e7b1e067e9 split load sinking out to its own function, like gep sinking. 
llvm-svn: 85737
 2009-11-01 20:04:24 +00:00
Chris Lattner
b3fe1009a5 fix a bug noticed by inspection: when instcombine sinks loads through 
phis, it didn't preserve the alignment of the load.  This is a missed
optimization of the alignment is high and a miscompilation when the
alignment is low.

llvm-svn: 85736
 2009-11-01 19:50:13 +00:00
Chris Lattner
ad2926bbb4 remove a bunch of locking from LLVMContextImpl. Since only one thread 
can be banging on a context at a time, this isn't needed.  Owen, please
review.

llvm-svn: 85728
 2009-11-01 18:42:03 +00:00
Chris Lattner
d8f9d01b76 teach ipsccp and ipconstprop that a blockaddress doesn't 'take the address' of a function 
in a way that should prevent ip constprop.  This allows clang/test/CodeGen/indirect-goto.c
to pass with the new indirect goto lowering.

llvm-svn: 85709
 2009-11-01 06:11:53 +00:00
Chris Lattner
746b4c0b20 strengthen an assumption: RevectorBlockTo knows that PredBB 
ended in an uncond branch because the pass requires BreakCriticalEdges.

However, BCE doesn't eliminate critical adges from indbrs.

llvm-svn: 85707
 2009-11-01 04:23:20 +00:00
Chris Lattner
0ee6bbbeb1 if CostMetrics says to never duplicate some code, don't unswitch a loop. 
This prevents unswitching from duplicating indbr's.

llvm-svn: 85705
 2009-11-01 03:42:55 +00:00
Chris Lattner
1f101c7a1a Make sure PRE doesn't split crit edges from indirectbr. 
llvm-svn: 85692
 2009-10-31 22:11:15 +00:00
Chris Lattner
43591a021a llvm::SplitEdge should refuse to split an edge from an indirectbr. 
Fix CodeGenPrepare to not try to split edges from indirectbr.

llvm-svn: 85690
 2009-10-31 22:04:43 +00:00
Chris Lattner
0be6fcef18 add a comment. 
llvm-svn: 85671
 2009-10-31 17:48:31 +00:00
Dan Gohman
0079f87732 Rename forgetLoopBackedgeTakenCount to forgetLoop, because it 
clears out more information than just the stored backedge taken count.

llvm-svn: 85664
 2009-10-31 15:04:55 +00:00
Dan Gohman
de593b49b6 Replace LoopUnrollPass.cpp's custom code-size estimation code using 
the new common CodeMetrics code.

llvm-svn: 85663
 2009-10-31 14:54:17 +00:00
Dan Gohman
0f8d034e2f Remove an unnecessary #include. 
llvm-svn: 85661
 2009-10-31 14:39:43 +00:00
Dan Gohman
793119ef88 Update CMakeLists for recent renames. 
llvm-svn: 85660
 2009-10-31 14:38:25 +00:00
Dan Gohman
0186fd092a Rename UnrollLoop.cpp to LoopUnroll.cpp, and LoopUnroll.cpp to 
LoopUnrollPass.cpp, for consistency with other passes which are
similarly split.

llvm-svn: 85659
 2009-10-31 14:37:31 +00:00
Dan Gohman
04c536dff6 Remove CodeGenLICM. It's largely obsoleted by MachineLICM's new ability 
to unfold loop-invariant loads.

llvm-svn: 85657
 2009-10-31 14:35:41 +00:00
Dan Gohman
25091aa227 Reapply r85634, with the bug fixed. 
llvm-svn: 85655
 2009-10-31 14:22:52 +00:00
Evan Cheng
a0457853b2 Revert 85634. It's breaking consumer-typeset (and others). 
llvm-svn: 85641
 2009-10-31 01:28:06 +00:00
Dan Gohman
a532f755f7 Optimize around the fact that pred_iterator is slow: instead of sorting 
PHI operands by the predecessor order, sort them by the order used by the
first PHI in the block. This is still suffucient to expose duplicates.

llvm-svn: 85634
 2009-10-30 23:15:21 +00:00
Dan Gohman
82139ffc65 Sort the incoming values in PHI nodes to match the predecessor order. 
This helps expose duplicate PHIs, which will make it easier for them
to be eliminated.

llvm-svn: 85623
 2009-10-30 22:22:22 +00:00
Evan Cheng
8db8f72185 Add option to createGVNPass to disable PRE. 
llvm-svn: 85609
 2009-10-30 20:12:24 +00:00
Nick Lewycky
5207d16c05 Apply some cleanups. No functionality changes. 
llvm-svn: 85498
 2009-10-29 07:35:15 +00:00
Chris Lattner
a0e35cae82 teach various passes about blockaddress. We no longer 
crash on any clang tests.

llvm-svn: 85465
 2009-10-29 01:21:20 +00:00
Edward O'Callaghan
fbe911a40e No newline at end of file. 
llvm-svn: 85390
 2009-10-28 15:04:53 +00:00
Benjamin Kramer
51f925548b Update CMake file. 
llvm-svn: 85389
 2009-10-28 13:29:18 +00:00
Owen Anderson
cfb2c9edeb Treat lifetime begin/end markers as allocations/frees respectively for the 
purposes for GVN/DSE.

llvm-svn: 85383
 2009-10-28 07:05:35 +00:00
Nick Lewycky
0376e34268 Add ABCD, a generalized implementation of the Elimination of Array Bounds 
Checks on Demand algorithm which looks at arbitrary branches instead of loop
iterations. This is GSoC work by Andre Tavares with only editorial changes
applied!

llvm-svn: 85382
 2009-10-28 07:03:15 +00:00
Devang Patel
b7572e3783 Factor out redundancy from clone() implementations. 
llvm-svn: 85327
 2009-10-27 22:16:29 +00:00
Victor Hernandez
0f662a7acf Rename MallocFreeHelper as MemoryBuiltins 
llvm-svn: 85286
 2009-10-27 20:05:49 +00:00
Mike Stump
5b347d4e9d VS build fix, patch by Marius Wachtler. 
llvm-svn: 85197
 2009-10-27 02:14:13 +00:00
Eric Christopher
89c2f934d6 Add objectsize intrinsic and hook it up through codegen. Doesn't 
do anything than return "I don't know" at the moment.

llvm-svn: 85189
 2009-10-27 00:52:25 +00:00
Dan Gohman
44189252b9 Add braces to avoid ambiguous else. 
llvm-svn: 85185
 2009-10-27 00:11:02 +00:00
Victor Hernandez
6c86b93663 Rename MallocHelper as MallocFreeHelper, since it now also identifies calls to free() 
llvm-svn: 85181
 2009-10-26 23:58:56 +00:00
Owen Anderson
a8d6745830 Add a straight-forward implementation of SCCVN for aggressively eliminating scalar redundancies. 
llvm-svn: 85179
 2009-10-26 23:55:47 +00:00
Victor Hernandez
673c036bc7 Remove FreeInst. 
Remove LowerAllocations pass.
Update some more passes to treate free calls just like they were treating FreeInst.

llvm-svn: 85176
 2009-10-26 23:43:48 +00:00
Dan Gohman
3f14cd3282 Simplify this code. LoopDeletion doesn't need to explicit check that 
the loop exiting block dominates the latch block; if ScalarEvolution
can prove that the trip-count is finite, that's sufficient.

llvm-svn: 85165
 2009-10-26 22:18:58 +00:00
Dan Gohman
795e3db7ce Code that checks WillNotOverflowSignedAdd before creating an Add 
can safely use the NSW bit on the Add.

llvm-svn: 85164
 2009-10-26 22:14:22 +00:00
Ted Kremenek
acb9fe806e Update CMake files. 
llvm-svn: 85161
 2009-10-26 22:06:01 +00:00