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Author SHA1 Message Date
Chris Lattner
b9c1684fce add a validity check that was missed, fixing a crash on the 
new testcase.

llvm-svn: 122662
 2011-01-01 20:12:04 +00:00
Duncan Sands
aaddf57af9 Revert commit 122654 at the request of Chris, who reckons that instsimplify 
is the wrong hammer for this nail, and is probably right.

llvm-svn: 122661
 2011-01-01 20:08:02 +00:00
Chris Lattner
9a9f43c4a2 improve validity check to handle constant-trip-count loops more 
aggressively.  In practice, this doesn't help anything though,
see the todo.

llvm-svn: 122660
 2011-01-01 19:54:22 +00:00
Chris Lattner
4651f8b037 implement the "no aliasing accesses in loop" safety check. This pass 
should be correct now.

llvm-svn: 122659
 2011-01-01 19:39:01 +00:00
Rafael Espindola
e223c0aa14 Fix PR8878. 
llvm-svn: 122658
 2011-01-01 19:05:35 +00:00
Duncan Sands
ec8b2b4cc5 Fix a README item by having InstructionSimplify do a mild form of value 
numbering, in which it considers (for example) "%a = add i32 %x, %y" and
"%b = add i32 %x, %y" to be equal because the operands are equal and the
result of the instructions only depends on the values of the operands.
This has almost no effect (it removes 4 instructions from gcc-as-one-file),
and perhaps slows down compilation: I measured a 0.4% slowdown on the large
gcc-as-one-file testcase, but it wasn't statistically significant.

llvm-svn: 122654
 2011-01-01 16:12:09 +00:00
Che-Liang Chiou
a188cfb574 ptx: remove reg-reg addressing mode and st.const 
llvm-svn: 122653
 2011-01-01 11:58:58 +00:00
Che-Liang Chiou
995a853724 ptx: add store instruction 
llvm-svn: 122652
 2011-01-01 10:50:37 +00:00
Oscar Fuentes
a63d0dbfbf Add to the list of cmake files the object file, not the asm file. This 
is necessary for executing the custom command that runs the
assember. Fixes PR8877.

llvm-svn: 122649
 2010-12-31 20:15:37 +00:00
Duncan Sands
74270e8100 Simplify this pass by using a depth-first iterator to ensure that all 
operands are visited before the instructions themselves.

llvm-svn: 122647
 2010-12-31 17:49:05 +00:00
Duncan Sands
ca280dbcd5 Zap dead instructions harder. 
llvm-svn: 122645
 2010-12-31 16:17:54 +00:00
Benjamin Kramer
c84434924f Make a bunch of symbols internal. 
llvm-svn: 122642
 2010-12-30 22:34:44 +00:00
Nick Lewycky
5cb84ee2cf Add another non-commutable instruction that gas accepts commuted forms for. 
Fixes PR8861.

llvm-svn: 122641
 2010-12-30 22:10:49 +00:00
Che-Liang Chiou
f4aaa1b2e1 ptx: add state spaces 
llvm-svn: 122638
 2010-12-30 10:41:27 +00:00
Chris Lattner
f0e1e53e62 include the module identifier when emitting this warning, PR8865. 
llvm-svn: 122637
 2010-12-30 02:49:45 +00:00
Chris Lattner
f3912fd05b print the right string, thanks for Frits for noticing. 
llvm-svn: 122636
 2010-12-30 01:07:20 +00:00
Cameron Zwarich
ae468579bb Use getVRegDef() instead of def_iterator. This leads to fewer defs being added 
with 2-address instructions, for about a 3.5% speedup of StrongPHIElimination on
403.gcc.

llvm-svn: 122635
 2010-12-30 00:42:23 +00:00
Chris Lattner
8b738dffaa improve warning message to at least say what the triples are. 
llvm-svn: 122632
 2010-12-29 22:41:18 +00:00
Wesley Peck
5a551350c3 Fix stack layout error in MBlaze backend. 
llvm-svn: 122631
 2010-12-29 19:46:28 +00:00
Daniel Dunbar
9ee74282a6 MC/Mach-O/Thumb: Set the thumb bit in the symbol table. 
llvm-svn: 122630
 2010-12-29 14:14:06 +00:00
Cameron Zwarich
1e7124e6fa None of the other pass names in CodeGen have terminating periods. 
llvm-svn: 122628
 2010-12-29 11:49:10 +00:00
Cameron Zwarich
a7052a3c06 Instead of processing every instruction when splitting interferences, only 
process those instructions that define phi sources. This is a 47% speedup of
StrongPHIElimination compile time on 403.gcc.

llvm-svn: 122627
 2010-12-29 11:00:09 +00:00
Venkatraman Govindaraju
1f9ecea940 SPARC backend fix: correctly passing arguments through stack 
llvm-svn: 122626
 2010-12-29 05:37:15 +00:00
Cameron Zwarich
292870da06 Add a missing word to a comment. 
llvm-svn: 122625
 2010-12-29 04:42:39 +00:00
Rafael Espindola
7b1b3f5d82 Correctly encode pcrel|indirect. 
llvm-svn: 122624
 2010-12-29 04:31:26 +00:00
NAKAMURA Takumi
2160b3953b CMake: Add disabling optimization on MSVC8 and MSVC10 as workaround for some files in Target/ARM and Target/X86. 
llvm-svn: 122623
 2010-12-29 03:59:27 +00:00
Cameron Zwarich
6fc15ba38b Add text explaining an assertion. 
llvm-svn: 122617
 2010-12-29 03:52:51 +00:00
Rafael Espindola
ed7b5659d4 Remove second return. 
llvm-svn: 122616
 2010-12-29 02:42:33 +00:00
Rafael Espindola
0408a378e9 Fix bug when trying to output uint16_t or uint32_t. 
llvm-svn: 122615
 2010-12-29 02:30:49 +00:00
Rafael Espindola
d51ed1fc6a Implement cfi_def_cfa. Also don't convert to dwarf reg numbers twice. Looks 
like 6 is a fixed point of that and so the previous tests were OK :-)

llvm-svn: 122614
 2010-12-29 01:42:56 +00:00
Chris Lattner
2f774c1246 fix PR8867: a crash handling fp128. Thanks to Nick for the testcase. 
llvm-svn: 122613
 2010-12-29 01:33:36 +00:00
Rafael Espindola
257de5c4a2 Implement cfi_def_cfa_register. 
llvm-svn: 122612
 2010-12-29 00:26:06 +00:00
Rafael Espindola
061209eaf3 Initial .cfi_offset implementation. 
llvm-svn: 122611
 2010-12-29 00:09:59 +00:00
Cameron Zwarich
0fa638e27c Simplify some code in MachineVerifier that was doing the correct thing, but not 
in the most obvious way.

llvm-svn: 122610
 2010-12-28 23:45:38 +00:00
Rafael Espindola
d93ec3572d Don't produce a "DW_CFA_advance_loc 0". 
llvm-svn: 122609
 2010-12-28 23:38:03 +00:00
Cameron Zwarich
3eacb7fff8 Revert the optimization in r122596. It is correct for all current targets, but 
it relies on assumptions that may not be true in the future.

llvm-svn: 122608
 2010-12-28 23:02:56 +00:00
Venkatraman Govindaraju
3c6418f9fc Multiple SPARC backend fixes: added Y register; updated select_cc, subx, subxcc defs/uses; 
and fixed CustomInserter.

llvm-svn: 122607
 2010-12-28 20:39:17 +00:00
Chris Lattner
51a906ce92 simplify this, isBytewiseValue handles the extra check. We still 
check for "multiple of a byte" in size to make it clear that the
>> 3 below is safe.

llvm-svn: 122604
 2010-12-28 18:53:48 +00:00
Chris Lattner
8e3ff12790 add a note from llvmdev 
llvm-svn: 122603
 2010-12-28 18:45:02 +00:00
Rafael Espindola
3fdd045643 Implement .cfi_remember_state and .cfi_restore_state. 
llvm-svn: 122602
 2010-12-28 18:36:23 +00:00
Benjamin Kramer
5acd47c674 Cast away "comparison between signed and unsigned integer" warnings. 
llvm-svn: 122598
 2010-12-28 13:52:52 +00:00
Benjamin Kramer
133004a64d Fix a signed/unsigned comparison warning. 
llvm-svn: 122597
 2010-12-28 13:05:13 +00:00
Cameron Zwarich
c9c7488542 Avoid iterating every operand of an instruction in StrongPHIElimination, since 
we are only interested in the defs when discovering interferences.

This is a 28% speedup running StrongPHIElimination on 403.gcc.

llvm-svn: 122596
 2010-12-28 10:49:33 +00:00
Duncan Sands
cc5a4497fd Pacify the compiler. BestWeight cannot in fact be used uninitialized 
in this function, but the compiler was warning that it might be when
doing a release build.

llvm-svn: 122595
 2010-12-28 10:07:15 +00:00
Duncan Sands
4799c69192 Fix warning about size potentially being used uninitialized 
when doing a release build.

llvm-svn: 122594
 2010-12-28 10:02:42 +00:00
Duncan Sands
1395f115d8 Silence gcc warning about an unused variable when doing a release build. 
llvm-svn: 122593
 2010-12-28 09:41:15 +00:00
Rafael Espindola
c97d642bf7 Relax address updates in the eh_frame section. 
llvm-svn: 122591
 2010-12-28 05:39:27 +00:00
Rafael Espindola
0552cb0638 Start adding basic support for emitting the call frame instructions. 
llvm-svn: 122590
 2010-12-28 04:15:37 +00:00
Michael J. Spencer
b604751adb Support/Path: Deprecate Path::hasMagicNumber and replace all uses with fs::has_magic. 
llvm-svn: 122589
 2010-12-28 01:49:21 +00:00
Michael J. Spencer
018595cf3a Support/PathV2: Implement has_magic. 
llvm-svn: 122587
 2010-12-28 01:49:01 +00:00
Cameron Zwarich
30f2239301 Change an assertion to assert what the code actually relies upon. 
llvm-svn: 122586
 2010-12-27 22:08:42 +00:00
Chris Lattner
2658d522b1 fix some issues Frits noticed, add AliasAnalysis as a dependency 
llvm-svn: 122585
 2010-12-27 18:39:08 +00:00
Rafael Espindola
12c30aed07 Add support for .cfi_lsda. 
llvm-svn: 122584
 2010-12-27 15:56:22 +00:00
Daniel Dunbar
2d0cf8e149 MC/Mach-O/Thumb: Select appropriate relocation types for Thumb. 
llvm-svn: 122583
 2010-12-27 14:49:49 +00:00
Cameron Zwarich
cfdb10a1bb Land a first cut at StrongPHIElimination. There are only 5 new test failures 
when running without the verifier, and I have not yet checked them to see if
the new results are still correct. There are more verifier failures, but they
all seem to be additional occurrences of verifier failures that occur with the
existing PHIElimination pass. There are a few obvious issues with the code:

1) It doesn't properly update the register equivalence classes during copy
insertion, and instead recomputes them before merging live intervals and
renaming registers. I wanted to keep this first patch simple for debugging
purposes, but it shouldn't be very hard to do this.

2) It doesn't mix the renaming and live interval merging with the copy insertion
process, which leads to a lot of virtual register churn. Virtual registers and
live intervals are created, only to later be merged into others. The code should
be smarter and only create a new virtual register if there is no existing
register in the same congruence class.

3) In one place the code uses a DenseMap per basic block, which is unnecessary
heap allocation. There should be an inline storage version of DenseMap.

I did a quick compile-time test of running llc on 403.gcc with and without
StrongPHIElimination. It is slightly slower with StrongPHIElimination, because
the small decrease in the coalescer runtime can't beat the increase in phi
elimination runtime. Perhaps fixing the above performance issues will narrow
the gap.

I also haven't yet run any tests of the quality of the generated code.

llvm-svn: 122582
 2010-12-27 10:08:19 +00:00
Cameron Zwarich
66289e34e1 Add knowledge of phi-def and phi-kill valnos to MachineVerifier's predecessor 
valno verification. The "Different value live out of predecessor" check is
incorrect in the case of phi-def valnos, so just skip that check for phi-def
valnos and instead check that all of the valnos for predecessors have phi-kill.
Fixes PR8863.

llvm-svn: 122581
 2010-12-27 05:17:23 +00:00
Michael J. Spencer
26654048d7 Support/PathV1: Deprecate GetRootDirectory. 
llvm-svn: 122580
 2010-12-27 03:21:41 +00:00
Rafael Espindola
7f947794d7 Handle reloc_riprel_4byte_movq_load. Should make the bots happy. 
llvm-svn: 122579
 2010-12-27 02:03:24 +00:00
Rafael Espindola
e7e67fce10 Add support for the same encodings of the personality function that gnu as 
supports.

llvm-svn: 122577
 2010-12-27 00:36:05 +00:00
Benjamin Kramer
30e1ba0fcc BuildLibCalls: Nuke EmitMemCpy, EmitMemMove and EmitMemSet. They are dead and superseded by IRBuilder. 
llvm-svn: 122576
 2010-12-27 00:25:32 +00:00
Benjamin Kramer
c66455a774 SimplifyLibCalls: Use IRBuilder to simplify code. 
llvm-svn: 122575
 2010-12-27 00:16:46 +00:00
Chris Lattner
a4249272b5 have loop-idiom nuke instructions that feed stores that get removed. 
llvm-svn: 122574
 2010-12-27 00:03:23 +00:00
Chris Lattner
d4daf9f002 implement enough of the memset inference algorithm to recognize and insert 
memsets.  This is still missing one important validity check, but this is enough
to compile stuff like this:

void test0(std::vector<char> &X) {
  for (std::vector<char>::iterator I = X.begin(), E = X.end(); I != E; ++I)
    *I = 0;
}

void test1(std::vector<int> &X) {
  for (long i = 0, e = X.size(); i != e; ++i)
    X[i] = 0x01010101;
}

With:
 $ clang t.cpp -S -o - -O2 -emit-llvm | opt -loop-idiom | opt -O3 | llc 

to:

__Z5test0RSt6vectorIcSaIcEE:            ## @_Z5test0RSt6vectorIcSaIcEE
## BB#0:                                ## %entry
	subq	$8, %rsp
	movq	(%rdi), %rax
	movq	8(%rdi), %rsi
	cmpq	%rsi, %rax
	je	LBB0_2
## BB#1:                                ## %bb.nph
	subq	%rax, %rsi
	movq	%rax, %rdi
	callq	___bzero
LBB0_2:                                 ## %for.end
	addq	$8, %rsp
	ret
...
__Z5test1RSt6vectorIiSaIiEE:            ## @_Z5test1RSt6vectorIiSaIiEE
## BB#0:                                ## %entry
	subq	$8, %rsp
	movq	(%rdi), %rax
	movq	8(%rdi), %rdx
	subq	%rax, %rdx
	cmpq	$4, %rdx
	jb	LBB1_2
## BB#1:                                ## %for.body.preheader
	andq	$-4, %rdx
	movl	$1, %esi
	movq	%rax, %rdi
	callq	_memset
LBB1_2:                                 ## %for.end
	addq	$8, %rsp
	ret

llvm-svn: 122573
 2010-12-26 23:42:51 +00:00
Chris Lattner
9007b56712 start using irbuilder to make mem intrinsics in a few passes. 
llvm-svn: 122572
 2010-12-26 22:57:41 +00:00
Chris Lattner
a46fd80777 add methods to IRBuilder to create memcpy/memset/memmove. 
llvm-svn: 122571
 2010-12-26 22:49:25 +00:00
Rafael Espindola
e9e6794917 Fix .cfi_personality on 32 bit systems. 
llvm-svn: 122570
 2010-12-26 22:47:37 +00:00
Rafael Espindola
2ebe553431 Add support for @note. Patch by Jörg Sonnenberger. 
llvm-svn: 122568
 2010-12-26 21:30:59 +00:00
Chris Lattner
27961b5180 sketch more of this out. 
llvm-svn: 122567
 2010-12-26 20:45:45 +00:00
Rafael Espindola
99f1527316 Add basic support for .cfi_personality. 
llvm-svn: 122566
 2010-12-26 20:20:31 +00:00
Chris Lattner
c56d20aa48 move isBytewiseValue out to ValueTracking.h/cpp 
llvm-svn: 122565
 2010-12-26 20:15:01 +00:00
Chris Lattner
73f562af94 actually add the file... 
llvm-svn: 122563
 2010-12-26 19:39:38 +00:00
Chris Lattner
e210c31646 Start of a pass for recognizing memset and memcpy idioms. 
No functionality yet.

llvm-svn: 122562
 2010-12-26 19:32:44 +00:00
Benjamin Kramer
626fccab8b Simplify code. 
llvm-svn: 122561
 2010-12-26 15:23:45 +00:00
Chris Lattner
a6f2b8316f fix some sort of weird pasto 
llvm-svn: 122560
 2010-12-26 12:05:11 +00:00
Chris Lattner
eec079a470 add a note 
llvm-svn: 122559
 2010-12-26 03:53:31 +00:00
Chris Lattner
2129ce0891 Generalize a previous change, fixing PR8855 - an valid large immediate 
rejected by the mc assembler.

llvm-svn: 122557
 2010-12-25 21:36:35 +00:00
Chris Lattner
a73a53e67f don't lose TD info 
llvm-svn: 122556
 2010-12-25 20:52:04 +00:00
Chris Lattner
38d6d6d367 switch the inliner alignment enforcement stuff to use the 
getOrEnforceKnownAlignment function, which simplifies the code
and makes it stronger.

llvm-svn: 122555
 2010-12-25 20:42:38 +00:00
Chris Lattner
c4cb20b9bf Move getOrEnforceKnownAlignment out of instcombine into Transforms/Utils. 
llvm-svn: 122554
 2010-12-25 20:37:57 +00:00
Michael J. Spencer
b3e50a570f Support/PathV1: Deprecate makeAbsolute and remove Unix impl because it annoys people. 
llvm-svn: 122553
 2010-12-25 20:10:11 +00:00
Benjamin Kramer
720b32b319 Fix a thinko pointed out by Frits van Bommel: looking through global variables in isBytewiseValue is not safe. 
llvm-svn: 122550
 2010-12-24 22:23:59 +00:00
Rafael Espindola
b2e09adc62 Merge IsFixupFullyResolved and IsSymbolRefDifferenceFullyResolved. We now 
have a single point where targets test if a relocation is needed.

llvm-svn: 122549
 2010-12-24 21:22:02 +00:00
Benjamin Kramer
49e40d4c4b MemCpyOpt: Turn memcpys from a constant into a memset if possible. 
This allows us to compile "int cst[] = {-1, -1, -1};" into
  movl  $-1, 16(%rsp)
  movq  $-1, 8(%rsp)
instead of
  movl  _cst+8(%rip), %eax
  movl  %eax, 16(%rsp)
  movq  _cst(%rip), %rax
  movq  %rax, 8(%rsp)

llvm-svn: 122548
 2010-12-24 21:17:12 +00:00
Daniel Dunbar
592854a10a MC/Mach-O/ARM: Start handling some Thumb branches. 
llvm-svn: 122547
 2010-12-24 16:41:46 +00:00
Andrew Trick
dfa31b1cf9 Minor cleanup related to my latest scheduler changes. 
llvm-svn: 122545
 2010-12-24 07:10:19 +00:00
Andrew Trick
c926e98fc7 Fix a few cases where the scheduler is not checking for phys reg copies. The scheduling node may have a NULL DAG node, yuck. 
llvm-svn: 122544
 2010-12-24 06:46:50 +00:00
Andrew Trick
134b2a5907 Various bits of framework needed for precise machine-level selection 
DAG scheduling during isel. Most new functionality is currently
guarded by -enable-sched-cycles and -enable-sched-hazard.

Added InstrItineraryData::IssueWidth field, currently derived from
ARM itineraries, but could be initialized differently on other targets.

Added ScheduleHazardRecognizer::MaxLookAhead to indicate whether it is
active, and if so how many cycles of state it holds.

Added SchedulingPriorityQueue::HasReadyFilter to allowing gating entry
into the scheduler's available queue.

ScoreboardHazardRecognizer now accesses the ScheduleDAG in order to
get information about it's SUnits, provides RecedeCycle for bottom-up
scheduling, correctly computes scoreboard depth, tracks IssueCount, and
considers potential stall cycles when checking for hazards.

ScheduleDAGRRList now models machine cycles and hazards (under
flags). It tracks MinAvailableCycle, drives the hazard recognizer and
priority queue's ready filter, manages a new PendingQueue, properly
accounts for stall cycles, etc.

llvm-svn: 122541
 2010-12-24 05:03:26 +00:00
Andrew Trick
53f4556c64 whitespace 
llvm-svn: 122539
 2010-12-24 04:28:06 +00:00
Cameron Zwarich
a7ad357a13 Simplify a check for implicit defs and remove a FIXME. 
llvm-svn: 122537
 2010-12-24 03:09:36 +00:00
Kevin Enderby
ff7e68c5e7 In llvm-mc parse a Hash token as a full line comment. Allows handling of 
preprocessed .s files and matches darwin gas.  rdar://8798690
Also fix a comment on the next line of AsmParser.cpp after this new code.

llvm-svn: 122531
 2010-12-24 00:12:02 +00:00
Jim Grosbach
7fc4f99084 Use a StringSwitch<> instead of a manually constructed string matcher. 
llvm-svn: 122530
 2010-12-24 00:03:39 +00:00
Owen Anderson
6afd90810e When determining if we can fold (x >> C1) << C2, the bits that we need to verify are zero 
are not the low bits of x, but the bits that WILL be the low bits after the operation completes.

llvm-svn: 122529
 2010-12-23 23:56:24 +00:00
Evan Cheng
ea28d16e36 Code clean up. No functionality change. 
llvm-svn: 122528
 2010-12-23 23:54:17 +00:00
Jim Grosbach
03a39130cb Remove dead patterns. 
llvm-svn: 122524
 2010-12-23 23:20:13 +00:00
Jim Grosbach
14f46d80df Recognize a few more documented register name aliases for ARM in the asm lexer. 
llvm-svn: 122523
 2010-12-23 23:19:54 +00:00
Bob Wilson
85dbc89f44 Radar 8803471: Fix expansion of ARM BCCi64 pseudo instructions. 
If the basic block containing the BCCi64 (or BCCZi64) instruction ends with
an unconditional branch, that branch needs to be deleted before appending
the expansion of the BCCi64 to the end of the block.

llvm-svn: 122521
 2010-12-23 22:45:49 +00:00
Owen Anderson
be8084acdd It is possible for SimplifyCFG to cause PHI nodes to become redundant too late in the optimization 
pipeline to be caught by instcombine, and it's not feasible to catch them in SimplifyCFG because the
use-lists are in an inconsistent state at the point where it could know that it need to simplify them.
Instead, have CodeGenPrepare look for trivially redundant PHIs as part of its general cleanup effort.

llvm-svn: 122516
 2010-12-23 20:57:35 +00:00
Chris Lattner
01e8c46349 Flag -> Glue, the ongoing saga 
llvm-svn: 122513
 2010-12-23 18:28:41 +00:00
Chris Lattner
b607e7deda flags -> glue for selectiondag 
llvm-svn: 122509
 2010-12-23 17:24:32 +00:00
Chris Lattner
fb9ff7a4ff sdisel flag -> glue. 
llvm-svn: 122507
 2010-12-23 17:13:18 +00:00
Benjamin Kramer
0a0e2c55c4 Remove/fix invalid README entries. The well thought out strcpy function doesn't return a pointer to the end of the string. 
llvm-svn: 122496
 2010-12-23 15:32:07 +00:00
Benjamin Kramer
b21118c91b Remove some obsolete README items, add a new one off the top of my head. 
llvm-svn: 122495
 2010-12-23 15:07:02 +00:00
Andrew Trick
ca2e267ddc Reorganize ListScheduleBottomUp in preparation for modeling machine cycles and instruction issue. 
llvm-svn: 122491
 2010-12-23 05:42:20 +00:00
Andrew Trick
c046a115d4 Converted LiveRegCycles to LiveRegGens. It's easier to work with and allows multiple nodes per cycle. 
llvm-svn: 122474
 2010-12-23 04:16:14 +00:00
Andrew Trick
e48d5d8395 In CheckForLiveRegDef use TRI->getOverlaps. 
llvm-svn: 122473
 2010-12-23 03:43:21 +00:00
Andrew Trick
cc701bcfdc Fixes PR8823: add-with-overflow-128.ll 
In the bottom-up selection DAG scheduling, handle two-address
instructions that read/write unspillable registers. Treat
the entire chain of two-address nodes as a single live range.

llvm-svn: 122472
 2010-12-23 03:15:51 +00:00
Mon P Wang
eb2ae28352 Preserve the address space when generating bitcasts for MemTransferInst in ConvertToScalarInfo 
llvm-svn: 122462
 2010-12-23 01:41:32 +00:00
Jeffrey Yasskin
a199652a3e Change all self assignments X=X to (void)X, so that we can turn on a 
new gcc warning that complains on self-assignments and
self-initializations.

llvm-svn: 122458
 2010-12-23 00:58:24 +00:00
Jim Grosbach
b0e9926c33 Trailing whitespace. 
llvm-svn: 122456
 2010-12-22 23:26:02 +00:00
Benjamin Kramer
49942a90b7 DAGCombine add (sext i1), X into sub X, (zext i1) if sext from i1 is illegal. The latter usually compiles into smaller code. 
example code:
unsigned foo(unsigned x, unsigned y) {
  if (x != 0) y--;
  return y;
}

before:
  _foo:                           ## @foo
    cmpl  $1, 4(%esp)             ## encoding: [0x83,0x7c,0x24,0x04,0x01]
    sbbl  %eax, %eax              ## encoding: [0x19,0xc0]
    notl  %eax                    ## encoding: [0xf7,0xd0]
    addl  8(%esp), %eax           ## encoding: [0x03,0x44,0x24,0x08]
    ret                           ## encoding: [0xc3]

after:
  _foo:                           ## @foo
    cmpl  $1, 4(%esp)             ## encoding: [0x83,0x7c,0x24,0x04,0x01]
    movl  8(%esp), %eax           ## encoding: [0x8b,0x44,0x24,0x08]
    adcl  $-1, %eax               ## encoding: [0x83,0xd0,0xff]
    ret                           ## encoding: [0xc3]

llvm-svn: 122455
 2010-12-22 23:17:45 +00:00
Benjamin Kramer
27d13684f5 InstCombine: creating selects from -1 and 0 is fine, they combine into a sext from i1. 
llvm-svn: 122453
 2010-12-22 23:12:15 +00:00
Benjamin Kramer
d8387aa9bd X86: Lower a select directly to a setcc_carry if possible. 
int test(unsigned long a, unsigned long b) { return -(a < b); }
compiles to
  _test:                              ## @test
    cmpq  %rsi, %rdi                  ## encoding: [0x48,0x39,0xf7]
    sbbl  %eax, %eax                  ## encoding: [0x19,0xc0]
    ret                               ## encoding: [0xc3]
instead of
  _test:                              ## @test
    xorl  %ecx, %ecx                  ## encoding: [0x31,0xc9]
    cmpq  %rsi, %rdi                  ## encoding: [0x48,0x39,0xf7]
    movl  $-1, %eax                   ## encoding: [0xb8,0xff,0xff,0xff,0xff]
    cmovael %ecx, %eax                ## encoding: [0x0f,0x43,0xc1]
    ret                               ## encoding: [0xc3]

llvm-svn: 122451
 2010-12-22 23:09:28 +00:00
Rafael Espindola
9e462b3734 Add r122359 back now that the bug in MCDwarfLineAddrFragment fragment has been 
fixed.

llvm-svn: 122448
 2010-12-22 22:16:24 +00:00
Rafael Espindola
3897d5e658 Assert that the AddrDelta expression is really constant and wrap it in a set 
if we have a lame assembler.

llvm-svn: 122446
 2010-12-22 22:04:28 +00:00
Jakob Stoklund Olesen
f761c75efb When RegAllocGreedy decides to spill the interferences of the current register, 
pick the victim with the lowest total spill weight.

llvm-svn: 122445
 2010-12-22 22:01:30 +00:00
Jakob Stoklund Olesen
71e527ef4b Include a shadow of the original CFG edges in the edge bundle graph. 
llvm-svn: 122444
 2010-12-22 22:01:28 +00:00
Rafael Espindola
81ac7c5fad Rename NeedsSetToChangeDiffSize to HasAggressiveSymbolFolding which is a much 
better name and matches what is used in the MachO writer.

llvm-svn: 122443
 2010-12-22 21:51:29 +00:00
Daniel Dunbar
e6ec0e7149 MC/Mach-O/ARM: Don't try to use scattered relocs for BR24 fixups. 
llvm-svn: 122441
 2010-12-22 21:26:43 +00:00
Rafael Espindola
6baac40d13 Revert r122359 while I debug PR8845. 
llvm-svn: 122427
 2010-12-22 19:05:49 +00:00
Matt Beaumont-Gay
2a54f466cf Fix another conditional expression mismatched enum type warning. 
llvm-svn: 122419
 2010-12-22 18:25:55 +00:00
Duncan Sands
68d969c2f5 When determining whether the new instruction was already present in 
the original instruction, half the cases were missed (making it not
wrong but suboptimal).  Also correct a typo (A <-> B) in the second
chunk. 

llvm-svn: 122414
 2010-12-22 17:15:25 +00:00
Daniel Dunbar
cb8ac619a2 MC/Mach-O/ARM: We always use the SECTDIFF reloc type on ARM, which is 
esp. important given that the LOCAL_SECTDIFF enumeration got redefined.

llvm-svn: 122412
 2010-12-22 16:52:19 +00:00
Daniel Dunbar
63f7a3a108 MC/Mach-O/ARM: Clone off an ARM version of RecordScatteredRelocation until I figure out how it is supposed to work. 
llvm-svn: 122410
 2010-12-22 16:45:29 +00:00
Daniel Dunbar
985567aebc MC/Mach-O: Return to reporting errors if we see unexpected fixup kinds. 
llvm-svn: 122409
 2010-12-22 16:32:41 +00:00
Daniel Dunbar
d85743ca7a MC/Mach-O/ARM: Recognize generic _Data_N fixup kinds. 
llvm-svn: 122408
 2010-12-22 16:32:37 +00:00
Daniel Dunbar
e44a2c1166 MC/Mach-O/ARM: Add enough relocation logic to get BR24 relocations. 
llvm-svn: 122407
 2010-12-22 16:19:24 +00:00
Daniel Dunbar
55eff2421b MC/Mach-O/ARM: Fix thinko. 
llvm-svn: 122406
 2010-12-22 16:19:20 +00:00
Rafael Espindola
c05eac148d Use references and simplify. 
llvm-svn: 122405
 2010-12-22 16:11:57 +00:00
Rafael Espindola
7c995a90fc Simplify the handling of .size expressions. 
llvm-svn: 122404
 2010-12-22 16:03:00 +00:00
Daniel Dunbar
17e19b2d45 MC/Mach-O/ARM: Stub out RecordARMRelocation, which is mostly a copy of 
RecordRelocation with lots of FIXMEs.

llvm-svn: 122402
 2010-12-22 13:50:05 +00:00
Daniel Dunbar
8db4843cd3 Simplify. 
llvm-svn: 122401
 2010-12-22 13:49:56 +00:00
Daniel Dunbar
bc2bf96e91 MC/Mach-O: Split out RecordARMRelocation for now, it is weird enough it isn't 
clear how to keep in the generic path (yet).
 - Will revisit when it actually works.

llvm-svn: 122400
 2010-12-22 13:49:43 +00:00
Duncan Sands
922251757b Add a generic expansion transform: A op (B op' C) -> (A op B) op' (A op C) 
if both A op B and A op C simplify.  This fires fairly often but doesn't
make that much difference.  On gcc-as-one-file it removes two "and"s and
turns one branch into a select.

llvm-svn: 122399
 2010-12-22 13:36:08 +00:00
Che-Liang Chiou
e73ad4387e ptx: add ld instruction and test 
llvm-svn: 122398
 2010-12-22 10:38:51 +00:00
Duncan Sands
9b28a173fe Add some statistics, good for understanding how much more powerful 
instcombine is compared to instsimplify.

llvm-svn: 122397
 2010-12-22 09:40:51 +00:00
Chris Lattner
04ef853e23 Fix a bug in ReduceLoadWidth that wasn't handling extending 
loads properly.  We miscompiled the testcase into:

_test:                                  ## @test
	movl	$128, (%rdi)
	movzbl	1(%rdi), %eax
	ret

Now we get a proper:

_test:                                  ## @test
	movl	$128, (%rdi)
	movsbl	(%rdi), %eax
	movzbl	%ah, %eax
	ret

This fixes PR8757.

llvm-svn: 122392
 2010-12-22 08:02:57 +00:00
Chris Lattner
35fcc63498 more cleanups, move a check for "roundedness" earlier to reject 
unhanded cases faster and simplify code.

llvm-svn: 122391
 2010-12-22 08:01:44 +00:00
Chris Lattner
60dcb2b5c2 reduce indentation and improve comments, no functionality change. 
llvm-svn: 122389
 2010-12-22 07:36:50 +00:00
Wesley Peck
2759b7bc98 Don't generate carry bit when loading immediate values on the Microblaze. 
llvm-svn: 122385
 2010-12-22 01:29:32 +00:00
Wesley Peck
0d64db9772 Add support for some of the LLVM atomic operations to the MBlaze backend. 
llvm-svn: 122384
 2010-12-22 01:15:01 +00:00
Wesley Peck
32c95e5ef4 Modeling the carry bit in the MSR register of the MicroBlaze. 
llvm-svn: 122381
 2010-12-22 00:53:07 +00:00
Wesley Peck
fc577ca406 Fix a regression introduced into the MBlaze delay slot filler. 
llvm-svn: 122379
 2010-12-22 00:22:59 +00:00
Owen Anderson
b4f1511864 Give GVN back the ability to perform simple conditional propagation on conditional branch values. 
I still think that LVI should be handling this, but that capability is some ways off in the future,
and this matters for some significant benchmarks.

llvm-svn: 122378
 2010-12-21 23:54:34 +00:00
Matt Beaumont-Gay
b03146b50a GCC objects to the two sides of a conditional expression having different enum 
types, but they're just getting converted to unsigned anyway, so cast first
(and ask questions later).

llvm-svn: 122377
 2010-12-21 23:43:23 +00:00
Owen Anderson
1ee218de0e Remove dead code. 
llvm-svn: 122371
 2010-12-21 22:31:24 +00:00
Andrew Trick
afec190a28 In DelayForLiveRegsBottomUp, handle instructions that read and write 
the same physical register. Simplifies the fix from the previous
checkin r122211.

llvm-svn: 122370
 2010-12-21 22:27:44 +00:00
Andrew Trick
1e3ad9f721 whitespace 
llvm-svn: 122368
 2010-12-21 22:25:04 +00:00
Dale Johannesen
e0fb87c3d7 Reapply 122353-122355 with fixes. 122354 was wrong; 
the shift type was needed one place, the shift count
type another.  The transform in 123555 had the same
problem.

llvm-svn: 122366
 2010-12-21 21:55:50 +00:00
Benjamin Kramer
369872edfc Add some x86 specific dagcombines for conditional increments. 
(add Y, (sete  X, 0)) -> cmp X, 1; adc  0, Y
(add Y, (setne X, 0)) -> cmp X, 1; sbb -1, Y
(sub (sete  X, 0), Y) -> cmp X, 1; sbb  0, Y
(sub (setne X, 0), Y) -> cmp X, 1; adc -1, Y

for
  unsigned foo(unsigned a, unsigned b) {
    if (a == 0) b++;
    return b;
  }
we now get:
  foo:
    cmpl  $1, %edi
    movl  %esi, %eax
    adcl  $0, %eax
    ret
instead of:
  foo:
    testl %edi, %edi
    sete  %al
    movzbl  %al, %eax
    addl  %esi, %eax
    ret

llvm-svn: 122364
 2010-12-21 21:41:44 +00:00
Benjamin Kramer
fd119319ea GVN's Expression is not POD-like (it contains a SmallVector). Simplify code while at it. 
llvm-svn: 122362
 2010-12-21 21:30:19 +00:00