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Author SHA1 Message Date
Owen Anderson
e680ac8dcb Revert r52459, which was causing an infinite loop or massive slowdown on MultiSource/Applications/SPASS, and possibly others as well. 
Please reapply once this is fixed.

llvm-svn: 52465
 2008-06-18 17:32:16 +00:00
Dan Gohman
606a60ad68 Move SCEVExpander::visitAddExpr out-of-line. 
llvm-svn: 52464
 2008-06-18 16:37:11 +00:00
Dan Gohman
82f9df016e Move LSR's private isZero function to a public SCEV member 
function, and make use of it in several places.

llvm-svn: 52463
 2008-06-18 16:23:07 +00:00
Gabor Greif
14dc959397 fix validator warning 
llvm-svn: 52461
 2008-06-18 14:05:31 +00:00
Gabor Greif
41d941a446 prettify, no semantic changes 
llvm-svn: 52460
 2008-06-18 13:44:57 +00:00
Matthijs Kooijman
b7e2818227 Rewrite the DeadArgumentElimination pass, to use a more explicit tracking of 
dependencies between return values and/or arguments. Also make the handling of
arguments and return values the same.

The pass now looks properly inside returned structs, but only at the first                                                                                     
level (ie, not inside nested structs).

Also add a testcase for testing various variations of (multiple) dead rerturn
values.

llvm-svn: 52459
 2008-06-18 11:12:53 +00:00
Matthijs Kooijman
8177832230 Reapply r52397 (make IPConstProp promote returned arguments), but fixed this 
time. Sorry for the trouble!

This time, also add a testcase, which I should have done in the first place...

llvm-svn: 52455
 2008-06-18 08:30:37 +00:00
Evan Cheng
0570953e28 XOR32rr, etc. are not AsCheapAsMove, but MOV32ri, etc. are. 
llvm-svn: 52454
 2008-06-18 08:13:07 +00:00
Matthijs Kooijman
bb59138fa6 Reapply r52396, it was unrelated to the breakage (that was caused by r52397, my 
commit after this).

llvm-svn: 52453
 2008-06-18 08:09:27 +00:00
Evan Cheng
ad0a4a31f8 Complete support for two-address pass rematerialization. Now *almost* always a win. 
llvm-svn: 52452
 2008-06-18 07:49:14 +00:00
Evan Cheng
e447be0532 Add MachineRegisterInfo::use_empty. 
llvm-svn: 52451
 2008-06-18 07:47:55 +00:00
Evan Cheng
cba32609d2 Cosmetic. 
llvm-svn: 52450
 2008-06-18 07:47:28 +00:00
Bill Wendling
c7a2b72a42 If compiling for PPC on an i386 box, the LTO wouldn't get the altivec (and 
other) feature information. The workaround is inelegant and could be cleaned up
if this information were available some other way (say, in the IR).

llvm-svn: 52447
 2008-06-18 06:35:30 +00:00
Chris Lattner
93da79f7a1 implement some simple bswap optimizations, rdar://5992453 
llvm-svn: 52442
 2008-06-18 04:33:20 +00:00
Chris Lattner
2a22e66e47 temporarily revert this testcase since its patch was reverted. 
llvm-svn: 52441
 2008-06-18 04:03:23 +00:00
Chris Lattner
7e403da191 make truncate/sext elimination capable of changing phi's. This 
implements rdar://6013816 and the testcase in Transforms/InstCombine/sext-misc.ll.

llvm-svn: 52440
 2008-06-18 04:00:49 +00:00
Evan Cheng
deb754898b Unbreak DECLARE isel in pic mode. 
llvm-svn: 52439
 2008-06-18 02:48:27 +00:00
Devang Patel
8f157a3670 Preserve dominance frontier while trivially unswitching loop. 
llvm-svn: 52438
 2008-06-18 02:16:38 +00:00
Devang Patel
960d6ae6d1 Check empty dominance frontier. 
llvm-svn: 52437
 2008-06-18 02:12:09 +00:00
Dan Gohman
c190d65454 Auto-upgrade code for multiple-value return statements. This code 
isn't actually called yet.

llvm-svn: 52435
 2008-06-17 23:38:43 +00:00
Dan Gohman
d9d529d7ed In InsertValueInst's copy ctor, actually copy the operands. 
llvm-svn: 52434
 2008-06-17 23:25:49 +00:00
Owen Anderson
c1ac0c1c41 We don't want to find dependencies within the same block in this case. It leads to incorrect results because 
we're detecting something at or after the call we're querying on.

llvm-svn: 52433
 2008-06-17 22:27:06 +00:00
Dan Gohman
24d9c8400f Implement the ExtractValueInst::getIndexedType that accepts one 
index value.

llvm-svn: 52432
 2008-06-17 21:07:55 +00:00
Evan Cheng
10ead77866 Live-through live interval is [mbb start, mbb end+1]. 
llvm-svn: 52431
 2008-06-17 20:13:36 +00:00
Evan Cheng
3dc2cfe366 When extending a liveinterval by commuting, don't throw away the live ranges that are not affected. 
llvm-svn: 52430
 2008-06-17 20:11:16 +00:00
Ted Kremenek
a9f1f1db52 Consistently set "Buckets[NumBuckets] = reinterpret_cast<void*>(-1)" throughout FoldingSet.cpp. 
llvm-svn: 52425
 2008-06-17 19:12:43 +00:00
Owen Anderson
79605db969 Add an insertBefore method for attaching previously unattached instructions, 
such as those created by clone(), to a basic block.

llvm-svn: 52424
 2008-06-17 18:29:27 +00:00
Owen Anderson
609a53ac86 Fix use of placement new to actually use an address. 
llvm-svn: 52423
 2008-06-17 18:07:43 +00:00
Evan Cheng
acd28b95da It's not safe to remove SUBREG_TO_REG that looks like identity copies, e.g. movl %eax, %eax on x86-64 actually does a zero-extend. 
llvm-svn: 52421
 2008-06-17 17:59:16 +00:00
Anton Korobeynikov
6a779ad6fa Add one more 'magic' define :) 
llvm-svn: 52420
 2008-06-17 17:57:43 +00:00
Anton Korobeynikov
cdfbb1eae5 Unbreak non-PPC builds 
llvm-svn: 52419
 2008-06-17 17:38:31 +00:00
Anton Korobeynikov
5b04f6d658 Provide generic hooks for icache invalidation. Add PPC implementation. 
Patch by Gary Benson!

llvm-svn: 52418
 2008-06-17 17:30:05 +00:00
Chris Lattner
4be2e72cc5 revert recent patch which is causing widespread breakage. 
llvm-svn: 52415
 2008-06-17 17:06:43 +00:00
Evan Cheng
d43a533365 Don't forget to initialize SymbolSearchingDisabled. 
llvm-svn: 52414
 2008-06-17 16:49:02 +00:00
Duncan Sands
ec220a7c48 Fix typo that changed the logic to something wrong. 
Spotted by Nick Lewycky.

llvm-svn: 52411
 2008-06-17 15:55:30 +00:00
Duncan Sands
ae9d876e69 Split type expansion into ExpandInteger and ExpandFloat 
rather than bundling them together.  Rename FloatToInt
to PromoteFloat (better, if not perfect).  Reorganize
files by types rather than by operations.

llvm-svn: 52408
 2008-06-17 14:27:01 +00:00
Matthijs Kooijman
44440c3722 Forgot to commit the ValueTracking header file along with r52396. 
llvm-svn: 52401
 2008-06-17 13:54:33 +00:00
Matthijs Kooijman
dd32cb58b5 Learn IPConstProp to propagate arguments that are directly returned. Strictly 
speaking these are not constant values. However, when a function always returns
one of its arguments, then from the point of view of each caller the return
value is constant (or at least a known value) and can be replaced.

llvm-svn: 52397
 2008-06-17 12:20:24 +00:00
Matthijs Kooijman
f0adaf34a1 Learn IPConstProp to look at individual return values and propagate them 
individually.

Also learn IPConstProp how returning first class aggregates work, in addition
to old style multiple return instructions.

Modify the return-constants testscase to confirm this behaviour.

llvm-svn: 52396
 2008-06-17 12:02:52 +00:00
Matthijs Kooijman
2fba6e78d6 80 column fixes. 
llvm-svn: 52391
 2008-06-17 08:26:32 +00:00
Matthijs Kooijman
dd18157e57 Use a SmallVector instead of an array, since auto_ptr doesn't handle arrays 
properly.

llvm-svn: 52390
 2008-06-17 08:24:37 +00:00
Chris Lattner
f461cca6b7 add a new -enable-value-prop flag for llcbeta, that enables propagation 
of value info (sign/zero ext info) from one MBB to another.  This doesn't
handle much right now because of two limitations:

1) only handles zext/sext, not random bit propagation (no assert exists 
   for this)
2) doesn't handle phis.

llvm-svn: 52383
 2008-06-17 06:09:18 +00:00
Duncan Sands
915b66e08b Fix spelling. 
llvm-svn: 52381
 2008-06-17 03:24:13 +00:00
Evan Cheng
89e2e3292d Rather than avoiding to wrap ISD::DECLARE GV operand in X86ISD::Wrapper, simply handle it at dagisel time with x86 specific isel code. 
llvm-svn: 52377
 2008-06-17 02:01:22 +00:00
Chris Lattner
468adb09d7 Add a missing ~ (dtor became ctor) which caused crashes on a bunch of stuff. 
llvm-svn: 52374
 2008-06-16 23:06:51 +00:00
Evan Cheng
8cfd1d39a1 Do not issue identity copies. 
llvm-svn: 52373
 2008-06-16 22:52:53 +00:00
Dan Gohman
c1fd5f170b Refine the change in r52258 for avoiding use-before-def conditions 
when changing the stride of a comparison so that it's slightly
more precise, by having it scan the instruction list to determine
if there is a use of the condition after the point where the
condition will be inserted.

llvm-svn: 52371
 2008-06-16 22:34:15 +00:00
Chris Lattner
dd707dc82d switch TypeHasCycleThroughItself from using an std::set to using a SmallPtrSet, 
this speeds up the linking testcase in PR1860 by 44% (.379 -> 0.263)

llvm-svn: 52365
 2008-06-16 21:20:58 +00:00
Chris Lattner
6782f56054 stop making PATypeHolder's so crazily. 
llvm-svn: 52364
 2008-06-16 21:17:12 +00:00
Evan Cheng
4e7b7b21a2 Horizontal-add instructions are not commutative. 
llvm-svn: 52363
 2008-06-16 21:16:24 +00:00