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76 Commits

Author SHA1 Message Date
Duncan Sands
aed2dfe3f6 Fix typo. Patch by nlewycky. 
llvm-svn: 58709
 2008-11-04 18:05:30 +00:00
Nuno Lopes
0995eae6b8 fix leakage of IfcvtTokens 
llvm-svn: 58690
 2008-11-04 13:02:59 +00:00
Dan Gohman
281881b8e2 Optimized FCMP_OEQ and FCMP_UNE for x86. 
Where previously LLVM might emit code like this:

        ucomisd %xmm1, %xmm0
        setne   %al
        setp    %cl
        orb     %al, %cl
        jne     .LBB4_2

it now emits this:

        ucomisd %xmm1, %xmm0
        jne     .LBB4_2
        jp      .LBB4_2

It has fewer instructions and uses fewer registers, but it does
have more branches. And in the case that this code is followed by
a non-fallthrough edge, it may be followed by a jmp instruction,
resulting in three branch instructions in sequence. Some effort
is made to avoid this situation.

To achieve this, X86ISelLowering.cpp now recognizes FCMP_OEQ and
FCMP_UNE in lowered form, and replace them with code that emits
two branches, except in the case where it would require converting
a fall-through edge to an explicit branch.

Also, X86InstrInfo.cpp's branch analysis and transform code now
knows now to handle blocks with multiple conditional branches. It
uses loops instead of having fixed checks for up to two
instructions. It can now analyze and transform code generated
from FCMP_OEQ and FCMP_UNE.

llvm-svn: 57873
 2008-10-21 03:29:32 +00:00
Dan Gohman
e1f9be27bc Tidy up several unbeseeming casts from pointer to intptr_t. 
llvm-svn: 55779
 2008-09-04 17:05:41 +00:00
Dan Gohman
3b4af81381 Fix SmallVector's size calculation so that a size of 0 is 
handled correctly, and change a few SmallVector uses to use
size 0 to more clearly reflect their intent.

llvm-svn: 55181
 2008-08-22 16:07:55 +00:00
Owen Anderson
600a8ca0d5 Convert uses of std::vector in TargetInstrInfo to SmallVector. This change had to be propoagated down into all the targets and up into all clients of this API. 
llvm-svn: 54802
 2008-08-14 22:49:33 +00:00
Dan Gohman
cd25487258 Pool-allocation for MachineInstrs, MachineBasicBlocks, and 
MachineMemOperands. The pools are owned by MachineFunctions.

This drastically reduces the number of calls to malloc/free made
during the "Emit" phase of scheduling, as well as later phases
in CodeGen. Combined with other changes, this speeds up the
"instruction selection" phase of CodeGen by 10% in some cases.

llvm-svn: 53212
 2008-07-07 23:14:23 +00:00
Evan Cheng
523ad8a09a Register if-converter pass for -debug-pass. 
llvm-svn: 51931
 2008-06-04 09:15:51 +00:00
Evan Cheng
f8b1257d2e Add a quick and dirty "loop aligner pass". x86 uses it to align its loops to 16-byte boundaries. 
llvm-svn: 47703
 2008-02-28 00:43:03 +00:00
Anton Korobeynikov
7dd00942cc Update gcc 4.3 warnings fix patch with recent head changes 
llvm-svn: 47368
 2008-02-20 11:10:28 +00:00
Dan Gohman
aad233ea10 Use empty() instead of comparing size() with zero. 
llvm-svn: 46514
 2008-01-29 13:02:09 +00:00
Chris Lattner
f83aae613c rename TargetInstrDescriptor -> TargetInstrDesc. 
Make MachineInstr::getDesc return a reference instead
of a pointer, since it can never be null.

llvm-svn: 45695
 2008-01-07 07:27:27 +00:00
Chris Lattner
18038a0aac simplify some code using new predicates 
llvm-svn: 45689
 2008-01-07 05:40:58 +00:00
Chris Lattner
f7f96d818f Rename MachineInstr::getInstrDescriptor -> getDesc(), which reflects 
that it is cheap and efficient to get.

Move a variety of predicates from TargetInstrInfo into 
TargetInstrDescriptor, which makes it much easier to query a predicate
when you don't have TII around.  Now you can use MI->getDesc()->isBranch()
instead of going through TII, and this is much more efficient anyway. Not
all of the predicates have been moved over yet.

Update old code that used MI->getInstrDescriptor()->Flags to use the
new predicates in many places.

llvm-svn: 45674
 2008-01-07 01:56:04 +00:00
Chris Lattner
ad9a6ccb83 Remove attribution from file headers, per discussion on llvmdev. 
llvm-svn: 45418
 2007-12-29 20:36:04 +00:00
Evan Cheng
87e735c4be Somehow this wasn't committed last time. M_CLOBBERS_PRED is gone. 
llvm-svn: 38495
 2007-07-10 17:50:43 +00:00
Evan Cheng
4c7b04f24d Teach if-conversion about instructions that were already predicated, e.g. conditional move. 
llvm-svn: 37964
 2007-07-06 23:24:39 +00:00
Evan Cheng
5e2aabd3ad Avoid if-converting simple block that ends with unconditional branch or fallthrough unless it branches / falls to the 'false' block. Not profitable, may end up increasing code size. 
llvm-svn: 37660
 2007-06-19 21:45:13 +00:00
Evan Cheng
12b3002673 Replace TargetInstrInfo::CanBeDuplicated() with a M_NOT_DUPLICABLE bit. 
llvm-svn: 37643
 2007-06-19 01:26:51 +00:00
Evan Cheng
b752a87db1 Fix some fragile code wrt CFG edge updating. 
llvm-svn: 37634
 2007-06-18 22:44:57 +00:00
Evan Cheng
b3cefc0824 Properly remove duplicate instructions as result of diamond if-conversion. Other bug fixes. 
llvm-svn: 37623
 2007-06-18 08:37:25 +00:00
Evan Cheng
1732a41371 Really turn if-converter loose: 
1. Consider all possible ifcvt cases at once. No longer restricted to bottom
   up iterative approach.
2. Sort all possible cases based on a cost function. Perform the most profitable
   ones first invalidate others that target the same blocks.
3. Fixed a number of bugs related to block duplication.

llvm-svn: 37613
 2007-06-16 09:34:52 +00:00
Evan Cheng
759b3cca3c Not every predicable block can be safely duplicated. 
llvm-svn: 37607
 2007-06-15 21:18:05 +00:00
Evan Cheng
88c463eb8c MachineInstr::isPredicable() is no longer needed. 
llvm-svn: 37599
 2007-06-15 19:06:07 +00:00
Evan Cheng
a6504bc2e0 Extra edges are deleted later if needed. 
llvm-svn: 37593
 2007-06-15 17:34:48 +00:00
Evan Cheng
f4d3d695b2 Allow small blocks to be duplicated to enable if-conversion. 
llvm-svn: 37590
 2007-06-15 07:36:12 +00:00
Evan Cheng
6f348e1c75 No really, clear predcessors states. 
llvm-svn: 37581
 2007-06-14 23:34:09 +00:00
Evan Cheng
b1b1914582 If BB is predicated, invalidate its predecessor(s) which would if-convert it. It needs to be re-analyzed. 
llvm-svn: 37580
 2007-06-14 23:13:19 +00:00
Evan Cheng
26d68261ae Fix typo. 
llvm-svn: 37577
 2007-06-14 21:26:08 +00:00
Evan Cheng
a2c2479e22 Fix some stupid bugs that have effectively disabled if-conversion. 
llvm-svn: 37575
 2007-06-14 20:28:52 +00:00
Evan Cheng
d4e9443a78 Typo 
llvm-svn: 37566
 2007-06-13 00:04:00 +00:00
Evan Cheng
d5aaab210c Now if-converting all 4 variants of triangles. 
llvm-svn: 37565
 2007-06-12 23:54:05 +00:00
Evan Cheng
d6740b478b Restructure code to reduce ifcvt compile time cost. 
llvm-svn: 37543
 2007-06-11 22:26:22 +00:00
Reid Spencer
0c11f4ebd8 Fix the build. 
llvm-svn: 37537
 2007-06-10 00:19:17 +00:00
Evan Cheng
859dab4bda Don't change CFG during analysis stage. Do so during ifcvt and invalidate predecessors accordingly. 
llvm-svn: 37531
 2007-06-09 01:03:43 +00:00
Evan Cheng
7996fc5d23 Carefully remove extraneous CFG edges after each ifcvt. 
llvm-svn: 37529
 2007-06-08 22:01:07 +00:00
Evan Cheng
515e2537d7 Correct transfer predicate information. 
llvm-svn: 37524
 2007-06-08 19:17:12 +00:00
Evan Cheng
49720a7312 Hidden options to help debugging ifcvt issues. 
llvm-svn: 37523
 2007-06-08 19:10:51 +00:00
Evan Cheng
a41764f141 Allow more cmp / bcc to be predicated; clean up triangle ifcvt checking code. 
llvm-svn: 37518
 2007-06-08 09:36:04 +00:00
Evan Cheng
2b9e9abed1 Only remove the edge from entry to false if false block is merged. 
llvm-svn: 37503
 2007-06-07 22:31:28 +00:00
Evan Cheng
4f73706838 ifcvt a triangle: don't merge ifcvt block with rejoin block if it can fall through to it. If merged, the resulting block is not a candidate for iterative ifcvting since it contains both predicated and non-predicated code. 
llvm-svn: 37487
 2007-06-07 08:13:00 +00:00
Evan Cheng
d440a235a1 Lots of bug fixes. Now finally in a reasonable state. 
llvm-svn: 37485
 2007-06-07 02:12:15 +00:00
Owen Anderson
b333dd064e Quick patch to fix the build, based on what it appears Evan meant to write. 
Evan, please check that this is in fact correct.

llvm-svn: 37471
 2007-06-06 16:22:00 +00:00
Evan Cheng
aeccfbef8b Lots of bug fixes. 
llvm-svn: 37467
 2007-06-06 10:16:17 +00:00
Evan Cheng
4c42a30bad If a unconditional branch is added to branch to the false path during ifcvt, the predicated block cannot be iteratively ifcvted. 
llvm-svn: 37456
 2007-06-06 02:08:52 +00:00
Evan Cheng
cc7186df2b Minor statistics counting bug. 
llvm-svn: 37451
 2007-06-06 01:12:44 +00:00
Evan Cheng
2eefb6f4c3 Fix a couple of typos and be smarter about order of blocks when ifcvt a diamond. 
llvm-svn: 37449
 2007-06-06 00:57:55 +00:00
Evan Cheng
3db28ad9f2 Fix diamond shape ifcvt bugs. 
llvm-svn: 37444
 2007-06-05 23:46:14 +00:00
Evan Cheng
acf719bf83 ReplaceUsesOfBlockWith() can modify the predecessors list. 
llvm-svn: 37441
 2007-06-05 22:03:53 +00:00
Evan Cheng
f2a2a5a025 Do not ifcvt if either true / false path is a backedge. Not profitable in almost all cases. 
llvm-svn: 37440
 2007-06-05 20:38:42 +00:00