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3738 Commits

Author SHA1 Message Date
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