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39 Commits

Author SHA1 Message Date
Bill Wendling 55b6b2b6a9 Revert r152907. 
llvm-svn: 152935
 2012-03-16 18:20:54 +00:00
Bill Wendling a2a26b546c The alignment of the pointer part of the store instruction may have an 
alignment. If that's the case, then we want to make sure that we don't increase
the alignment of the store instruction. Because if we increase it to be "more
aligned" than the pointer, code-gen may use instructions which require a greater
alignment than the pointer guarantees.
<rdar://problem/11043589>

llvm-svn: 152907
 2012-03-16 07:40:08 +00:00
Bill Wendling 8ddfc09e7a Use the getFirstInsertionPt() method instead of getFirstNonPHI + an 'isa<>' 
check for a LandingPadInst.

llvm-svn: 137745
 2011-08-16 20:45:24 +00:00
Bill Wendling be33e8d58d A few places where we want to skip the landingpad instruction for insertion. 
llvm-svn: 137712
 2011-08-16 04:52:55 +00:00
Eli Friedman 8bc586e770 Update instcombine for atomic load/store. 
llvm-svn: 137664
 2011-08-15 22:09:40 +00:00
Jay Foad d1b7849d49 Convert GetElementPtrInst to use ArrayRef. 
llvm-svn: 135904
 2011-07-25 09:48:08 +00:00
Jay Foad 040dd82f44 Convert IRBuilder::CreateGEP and IRBuilder::CreateInBoundsGEP to use 
ArrayRef.

llvm-svn: 135761
 2011-07-22 08:16:57 +00:00
Jay Foad 71f19ac6af Fix an MSVC warning, caused by a case I missed when converting 
ConstantExpr::getGetElementPtr to use ArrayRef.

llvm-svn: 135758
 2011-07-22 07:54:01 +00:00
Chris Lattner 229907cd11 land David Blaikie's patch to de-constify Type, with a few tweaks. 
llvm-svn: 135375
 2011-07-18 04:54:35 +00:00
Eli Friedman 35211c6091 Final step of instcombine debuginfo; switch a couple more places over to InsertNewInstWith, and use setDebugLoc for the cases which can't be easily handled by the automated mechanisms. 
llvm-svn: 132167
 2011-05-27 00:19:40 +00:00
Eli Friedman 41e509a33d More instcombine cleanup, towards improving debug line info. 
llvm-svn: 131604
 2011-05-18 23:58:37 +00:00
Jay Foad 52131344a2 Remove PHINode::reserveOperandSpace(). Instead, add a parameter to 
PHINode::Create() giving the (known or expected) number of operands.

llvm-svn: 128537
 2011-03-30 11:28:46 +00:00
Jin-Gu Kang b452db02f0 This case is solved by Scalar Replacement of Aggregates (DT) and 
Early CSE pass so this patch reverts it to original source code.

llvm-svn: 127574
 2011-03-14 01:21:00 +00:00
Jin-Gu Kang b7538c71e1 Add comment as following: 
load and store reference same memory location, the memory location
is represented by getelementptr with two uses (load and store) and
the getelementptr's base is alloca with single use. At this point,
instructions from alloca to store can be removed.
(this pattern is generated when bitfield is accessed.)
For example,
%u = alloca %struct.test, align 4               ; [#uses=1]
%0 = getelementptr inbounds %struct.test* %u, i32 0, i32 0;[#uses=2]
%1 = load i8* %0, align 4                       ; [#uses=1]
%2 = and i8 %1, -16                             ; [#uses=1]
%3 = or i8 %2, 5                                ; [#uses=1]
store i8 %3, i8* %0, align 4

llvm-svn: 127565
 2011-03-13 14:05:51 +00:00
Jin-Gu Kang 2e939f7c3c This patch removes some of useless instructions generated by bitfield access. 
llvm-svn: 127539
 2011-03-12 12:18:44 +00:00
Devang Patel fbb482b314 llvm.dbg.declare intrinsic does not use any llvm::Values. It's magic! 
llvm-svn: 127282
 2011-03-08 22:12:11 +00:00
Duncan Sands 75b5d27b84 Spelling fix: consequtive -> consecutive. 
llvm-svn: 125563
 2011-02-15 09:23:02 +00:00
Chris Lattner 6fcd32e7d7 Move getOrEnforceKnownAlignment out of instcombine into Transforms/Utils. 
llvm-svn: 122554
 2010-12-25 20:37:57 +00:00
Dan Gohman 2e20dfb0f2 Fix a case where instcombine was stripping metadata (and alignment) 
from stores when folding in bitcasts.

llvm-svn: 117265
 2010-10-25 16:16:27 +00:00
Owen Anderson 376597c13e Remove r111665, which implemented store-narrowing in InstCombine. Chris discovered a miscompilation in it, and it's not easily 
fixable at the optimizer level. I'll investigate reimplementing it in DAGCombine.

llvm-svn: 112575
 2010-08-31 04:41:06 +00:00
Owen Anderson 84c29a096b Re-apply r111568 with a fix for the clang self-host. 
llvm-svn: 111665
 2010-08-20 18:24:43 +00:00
Owen Anderson 43057cd56a Revert r111568 to unbreak clang self-host. 
llvm-svn: 111571
 2010-08-19 23:25:16 +00:00
Owen Anderson bb723b228a When a set of bitmask operations, typically from a bitfield initialization, only modifies the low bytes of a value, 
we can narrow the store to only over-write the affected bytes.

llvm-svn: 111568
 2010-08-19 22:15:40 +00:00
Dan Gohman 3619660529 Make instcombine set explicit alignments on load or store 
instructions with alignment 0, so that subsequent passes don't
need to bother checking the TargetData ABI size manually.

llvm-svn: 110128
 2010-08-03 18:20:32 +00:00
Gabor Greif dde79d8f1a mass elimination of reliance on automatic iterator dereferencing 
llvm-svn: 109103
 2010-07-22 13:36:47 +00:00
Gabor Greif 1b787df129 cache result of operator* 
llvm-svn: 108150
 2010-07-12 15:48:26 +00:00
Gabor Greif 60a346d0f1 do not repeatedly dereference use_iterator 
llvm-svn: 107962
 2010-07-09 12:23:50 +00:00
Dan Gohman 826bdf8c10 Move FindAvailableLoadedValue isSafeToLoadUnconditionally out of 
lib/Transforms/Utils and into lib/Analysis so that Analysis passes
can use them.

llvm-svn: 104949
 2010-05-28 16:19:17 +00:00
Dan Gohman df5d7dcef1 Teach instcombine to promote alloca array sizes. 
llvm-svn: 104945
 2010-05-28 15:09:00 +00:00
Duncan Sands 19d0b47b1f There are two ways of checking for a given type, for example isa<PointerType>(T) 
and T->isPointerTy().  Convert most instances of the first form to the second form.
Requested by Chris.

llvm-svn: 96344
 2010-02-16 11:11:14 +00:00
Duncan Sands 9dff9bec31 Uniformize the names of type predicates: rather than having isFloatTy and 
isInteger, we now have isFloatTy and isIntegerTy.  Requested by Chris!

llvm-svn: 96223
 2010-02-15 16:12:20 +00:00
Bob Wilson 56600a15ad Check alignment of loads when deciding whether it is safe to execute them 
unconditionally.  Besides checking the offset, also check that the underlying
object is aligned as much as the load itself.

llvm-svn: 94875
 2010-01-30 04:42:39 +00:00
Bob Wilson 4b71b6c179 Use more specific types to avoid casts. No functionality change. 
llvm-svn: 94863
 2010-01-30 00:41:10 +00:00
Bob Wilson 1b8453067b Preserve load alignment in instcombine transformations. I've been unable to 
create a testcase where this matters.  The select+load transformation only
occurs when isSafeToLoadUnconditionally is true, and in those situations,
instcombine also changes the underlying objects to be aligned.  This seems
like a good idea regardless, and I've verified that it doesn't pessimize
the subsequent realignment.

llvm-svn: 94850
 2010-01-29 22:39:21 +00:00
Bob Wilson 7c42b9d51e Improve isSafeToLoadUnconditionally to recognize that GEPs with constant 
indices are safe if the result is known to be within the bounds of the
underlying object.

llvm-svn: 94829
 2010-01-29 19:19:08 +00:00
Victor Hernandez 5f8c8c034a Keep ignoring pointer-to-pointer bitcasts 
llvm-svn: 94194
 2010-01-22 19:05:05 +00:00
Victor Hernandez 5f5abd598c No need to look through bitcasts for DbgInfoIntrinsic 
llvm-svn: 94112
 2010-01-21 23:07:15 +00:00
Eric Christopher 84bd316bd6 Fix comment. 
llvm-svn: 93831
 2010-01-19 01:20:15 +00:00
Chris Lattner a65e2f7304 split out load/store/alloca. 
llvm-svn: 92685
 2010-01-05 05:57:49 +00:00