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Author SHA1 Message Date
Chris Lattner
e304ae5621 Start doing the significantly useful part of jump threading: handle cases 
where a comparison has a phi input and that phi is a constant.  For example,
stuff like:

  Threading edge through bool from 'bb2149' to 'bb2231' with cost: 1, across block:
bb2237:		; preds = %bb2231, %bb2149
	%tmp2328.rle = phi i32 [ %tmp2232, %bb2231 ], [ %tmp2232439, %bb2149 ]		; <i32> [#uses=2]
	%done.0 = phi i32 [ %done.2, %bb2231 ], [ 0, %bb2149 ]		; <i32> [#uses=1]
	%tmp2239 = icmp eq i32 %done.0, 0		; <i1> [#uses=1]
	br i1 %tmp2239, label %bb2231, label %bb2327

or

bb38.i298:		; preds = %bb33.i295, %bb1693
	%tmp39.i296.rle = phi %struct.ibox* [ null, %bb1693 ], [ %tmp39.i296.rle1109, %bb33.i295 ]		; <%struct.ibox*> [#uses=2]
	%minspan.1.i291.reg2mem.1 = phi i32 [ 32000, %bb1693 ], [ %minspan.0.i288, %bb33.i295 ]		; <i32> [#uses=1]
	%tmp40.i297 = icmp eq %struct.ibox* %tmp39.i296.rle, null		; <i1> [#uses=1]
	br i1 %tmp40.i297, label %implfeeds.exit311, label %bb43.i301

This triggers thousands of times in spec.

llvm-svn: 50110
 2008-04-22 21:40:39 +00:00
Chris Lattner
c59cf9c8da Dig through multiple levels of AND to thread jumps if needed. 
llvm-svn: 50106
 2008-04-22 20:46:09 +00:00
Owen Anderson
7b318804cc Move MemCpyOpt after GVN. 
llvm-svn: 50097
 2008-04-22 07:12:26 +00:00
Chris Lattner
dcbc6443ae Teach jump threading to thread through blocks like: 
br (and X, phi(Y, Z, false)), label L1, label L2

This triggers once on 252.eon and 6 times on 176.gcc.  Blocks 
in question often look like this:

bb262:		; preds = %bb261, %bb248
	%iftmp.251.0 = phi i1 [ true, %bb261 ], [ false, %bb248 ]		; <i1> [#uses=4]
	%tmp270 = icmp eq %struct.rtx_def* %tmp.0.i, null		; <i1> [#uses=1]
	%bothcond = or i1 %iftmp.251.0, %tmp270		; <i1> [#uses=1]
	br i1 %bothcond, label %bb288, label %bb273

In this case, it is clear that it doesn't matter if tmp.0.i is null when coming from bb261.  When coming from bb248, it is all that matters.


Another random example:

check_asm_operands.exit:		; preds = %check_asm_operands.exit.thr_comm, %bb30.i, %bb12.i, %bb6.i413
	%tmp.0.i420 = phi i1 [ true, %bb6.i413 ], [ true, %bb12.i ], [ true, %bb30.i ], [ false, %check_asm_operands.exit.thr_comm ; <i1> [#uses=1]
	call void @llvm.stackrestore( i8* %savedstack ) nounwind 
	%tmp4389 = icmp eq i32 %added_sets_1.0, 0		; <i1> [#uses=1]
	%tmp4394 = icmp eq i32 %added_sets_2.0, 0		; <i1> [#uses=1]
	%bothcond80 = and i1 %tmp4389, %tmp4394		; <i1> [#uses=1]
	%bothcond81 = and i1 %bothcond80, %tmp.0.i420		; <i1> [#uses=1]
	br i1 %bothcond81, label %bb4398, label %bb4397

Here is the case from 252.eon:

bb290.i.i:		; preds = %bb23.i57.i.i, %bb8.i39.i.i, %bb100.i.i, %bb100.i.i, %bb85.i.i110
	%myEOF.1.i.i = phi i1 [ true, %bb100.i.i ], [ true, %bb100.i.i ], [ true, %bb85.i.i110 ], [ true, %bb8.i39.i.i ], [ false, %bb23.i57.i.i ]		; <i1> [#uses=2]
	%i.4.i.i = phi i32 [ %i.1.i.i, %bb85.i.i110 ], [ %i.0.i.i, %bb100.i.i ], [ %i.0.i.i, %bb100.i.i ], [ %i.3.i.i, %bb8.i39.i.i ], [ %i.3.i.i, %bb23.i57.i.i ]		; <i32> [#uses=3]
	%tmp292.i.i = load i8* %tmp16.i.i100, align 1		; <i8> [#uses=1]
	%tmp293.not.i.i = icmp ne i8 %tmp292.i.i, 0		; <i1> [#uses=1]
	%bothcond.i.i = and i1 %tmp293.not.i.i, %myEOF.1.i.i		; <i1> [#uses=1]
	br i1 %bothcond.i.i, label %bb202.i.i, label %bb301.i.i
  Factoring out 3 common predecessors.

On the path from any blocks other than bb23.i57.i.i, the load and compare 
are dead.

llvm-svn: 50096
 2008-04-22 07:05:46 +00:00
Evan Cheng
bd805d9a00 Added command line option -no-lazy to disable JIT lazy compilation. 
llvm-svn: 50095
 2008-04-22 06:51:41 +00:00
Chris Lattner
003d69adef refactor some code, no functionality change. 
llvm-svn: 50094
 2008-04-22 06:36:15 +00:00
Chris Lattner
4638234905 add a basic testcase. 
llvm-svn: 50093
 2008-04-22 06:35:14 +00:00
Nick Lewycky
97179cb16f Whoops! Undo r50087, unbreak the build. 
llvm-svn: 50088
 2008-04-22 05:20:06 +00:00
Nick Lewycky
e708ae5ffd Reverse r47989. Part of removing 'unwinds to' support. 
llvm-svn: 50087
 2008-04-22 05:16:51 +00:00
Nick Lewycky
1b583954ad Start removing 'unwinds to' support from mainline in preparation for 2.3. 
llvm-svn: 50086
 2008-04-22 05:16:02 +00:00
Owen Anderson
1b5d08ac04 Add MemCpyOpt to LTO. 
llvm-svn: 50081
 2008-04-22 03:57:36 +00:00
Chris Lattner
8837037473 remove dead code. 
llvm-svn: 50080
 2008-04-22 03:21:48 +00:00
Chris Lattner
14be19cf1e optimize "p != gep p, ..." better. This allows us to compile 
getelementptr-seteq.ll into:

define i1 @test(i64 %X, %S* %P) {
	%C = icmp eq i64 %X, -1		; <i1> [#uses=1]
	ret i1 %C
}

instead of:

define i1 @test(i64 %X, %S* %P) {
	%A.idx.mask = and i64 %X, 4611686018427387903		; <i64> [#uses=1]
	%C = icmp eq i64 %A.idx.mask, 4611686018427387903		; <i1> [#uses=1]
	ret i1 %C
}

And fixes the second half of PR2235.  This speeds up the insertion sort
case by 45%, from 1.12s to 0.77s.  In practice, this will significantly
speed up for loops structured like:

for (double *P = Base + N; P != Base; --P)
  ...

Which happens frequently for C++ iterators.

llvm-svn: 50079
 2008-04-22 02:53:33 +00:00
Chris Lattner
188b560336 more fallout from Nicholas' asmprinter patch. 
llvm-svn: 50078
 2008-04-22 02:45:44 +00:00
Dan Gohman
93b5be1824 Implement an x86-64 ABI detail of passing structs by hidden first 
argument. The x86-64 ABI requires the incoming value of %rdi to
be copied to %rax on exit from a function that is returning a
large C struct.

Also, add a README-X86-64 entry detailing the missed optimization
opportunity and proposing an alternative approach.

llvm-svn: 50075
 2008-04-21 23:59:07 +00:00
Gabor Greif
4a1122fc9e fix some residual old API that fell thru the cracks of the conversion script, closes http://llvm.org/bugs/show_bug.cgi?id=2246 
llvm-svn: 50062
 2008-04-21 21:31:55 +00:00
Dan Gohman
b4db3f46ac Fix an out-of-bounds access in -view-sunit-dags in the case of an 
empty ScheduleDAG.

llvm-svn: 50054
 2008-04-21 20:07:30 +00:00
Dan Gohman
105b523786 Fix the encoding of the MMX movd that moves from MMX to 64-bit GPR. 
llvm-svn: 50053
 2008-04-21 19:52:29 +00:00
Dan Gohman
8f3ee5a54d Fix the way AliasSet::print prints "may alias". 
llvm-svn: 50051
 2008-04-21 19:48:48 +00:00
Chris Lattner
6e88cf849b fix grammar-o, thanks to Duncan for noticing. 
llvm-svn: 50047
 2008-04-21 18:25:01 +00:00
Duncan Sands
717a1e09aa Make these structs larger to ensure that they 
are returned by struct return.

llvm-svn: 50038
 2008-04-21 08:17:05 +00:00
Duncan Sands
cfb3631483 Make the struct bigger, to ensure it is returned 
by struct return.

llvm-svn: 50037
 2008-04-21 08:12:03 +00:00
Owen Anderson
1d83396504 Use GVN in LTO instead of GCSE+LoadVN. 
llvm-svn: 50036
 2008-04-21 07:51:07 +00:00
Owen Anderson
b171c54227 Remove unneeded #include's. 
llvm-svn: 50035
 2008-04-21 07:47:38 +00:00
Owen Anderson
bc6046416f Refactor memcpyopt based on Chris' suggestions. Consolidate several functions 
and simplify code that was fallout from the separation of memcpyopt and gvn.

llvm-svn: 50034
 2008-04-21 07:45:10 +00:00
Duncan Sands
79654e36ce Fix a "large integer implicitly truncated to unsigned type" 
warning.

llvm-svn: 50033
 2008-04-21 07:35:28 +00:00
Chris Lattner
7925af6adf don't print dominators every time it is computed with -debug. 
llvm-svn: 50032
 2008-04-21 06:19:02 +00:00
Chris Lattner
c077c2a4ea another bug introduced in r47802 by nicholas, for no apparent reason. 
llvm-svn: 50031
 2008-04-21 06:12:55 +00:00
Chris Lattner
3117d33f74 Add an ugly note. 
llvm-svn: 50029
 2008-04-21 04:46:30 +00:00
Chris Lattner
1554876e9d Add jump threading to liblto. 
llvm-svn: 50028
 2008-04-21 04:31:40 +00:00
Chris Lattner
8d8e939418 run the jump threading pass in llvm-ld also 
llvm-svn: 50027
 2008-04-21 04:28:40 +00:00
Chris Lattner
c9547a13e5 enable jump threading pass by default. This causes no miscompilations 
and can significantly shrinkify some code, particularly from C++ land.

llvm-svn: 50025
 2008-04-21 04:22:09 +00:00
Chris Lattner
26468c09af fix a bug introduced by Nicholas' "unwinds to" stuff: we 
lost newlines between blocks.

llvm-svn: 50024
 2008-04-21 04:20:33 +00:00
Chris Lattner
ca82082080 don't assume that the argument passed to fprintf("%s" is a string. This 
fixes a crash in opt on 433.milc.

llvm-svn: 50023
 2008-04-21 03:18:33 +00:00
Chris Lattner
9a21fbcf81 Use the new SplitBlockPredecessors to implement a todo. 
llvm-svn: 50022
 2008-04-21 02:57:57 +00:00
Chris Lattner
57e11a167d Move SplitBlockPredecessors out of loopsimplify into BasicBlockUtils.h 
as a global helper function.  At the same type, switch it from taking
a vector of predecessors to an arbitrary sequential input.  This allows
us to switch LoopSimplify to use a SmallVector for various temporary
vectors that it passed into SplitBlockPredecessors.

llvm-svn: 50020
 2008-04-21 01:28:02 +00:00
Chris Lattner
ba4567c335 Move domtree/frontier updating earlier, allowing us to use it to update phi 
nodes, removing a hack.

llvm-svn: 50019
 2008-04-21 01:05:08 +00:00
Chris Lattner
53fa4554be Factor dominator tree and frontier updating into SplitBlockPredecessors 
instead of doing it after every call.

llvm-svn: 50018
 2008-04-21 00:54:38 +00:00
Chris Lattner
34894abd7f fit some more code in 80 cols. 
llvm-svn: 50016
 2008-04-21 00:25:49 +00:00
Chris Lattner
7da61d5766 simplify code, fit in 80 cols. 
llvm-svn: 50015
 2008-04-21 00:23:14 +00:00
Chris Lattner
45b3ace5a3 fit in 80 cols 
llvm-svn: 50014
 2008-04-21 00:19:16 +00:00
Nicolas Geoffray
aaa764cf3a Be pessimistic in computing the buffer size when aligning. 
llvm-svn: 50008
 2008-04-20 23:39:44 +00:00
Nicolas Geoffray
036fb2bebf Don't forget to update the current operand when getting the size of an instruction. 
llvm-svn: 50007
 2008-04-20 23:36:47 +00:00
Chris Lattner
56fbe56c25 finish the first cut of a jump threading pass implementation. 
llvm-svn: 50006
 2008-04-20 22:39:42 +00:00
Chris Lattner
4037996a0c replace a slow and verbose version of Instruction::isUsedOutsideOfBlock with 
a call to Instruction::isUsedOutsideOfBlock.

llvm-svn: 50005
 2008-04-20 22:18:22 +00:00
Chris Lattner
368e2b28bf add a handy helper method to instruction, useful for determining 
whether it is used outside of some block.  This can be used to see
if there are any non-local references, for example.

llvm-svn: 50004
 2008-04-20 22:11:30 +00:00
Chris Lattner
c714a8cee8 we can only thread blocks when there is a pred we can determine the succ of. 
llvm-svn: 50003
 2008-04-20 21:18:09 +00:00
Chris Lattner
4fcfb808fb improve comments, infrastructure, and add some validity checks for threading. 
Add a cost function.

llvm-svn: 50002
 2008-04-20 21:13:06 +00:00
Chris Lattner
c8c74f39db Add a new Jump Threading pass, which will handle cases 
such as those in PR2235.  Right now the pass is not very
effective. :)

llvm-svn: 50000
 2008-04-20 20:35:01 +00:00
Chris Lattner
75df16a5b0 hopefully resolve PR2240 
llvm-svn: 49999
 2008-04-20 19:59:12 +00:00