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37 Commits

Author SHA1 Message Date
Bill Wendling
3d7b8eaa78 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
3e159bd43d 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
36ef5fd140 Update instcombine for atomic load/store. 
llvm-svn: 137664
 2011-08-15 22:09:40 +00:00
Jay Foad
6513dac6e2 Convert GetElementPtrInst to use ArrayRef. 
llvm-svn: 135904
 2011-07-25 09:48:08 +00:00
Jay Foad
42463ed852 Convert IRBuilder::CreateGEP and IRBuilder::CreateInBoundsGEP to use 
ArrayRef.

llvm-svn: 135761
 2011-07-22 08:16:57 +00:00
Jay Foad
e12d8629a8 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
e1fe7061ce 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
6937c422a0 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
40a0353b96 More instcombine cleanup, towards improving debug line info. 
llvm-svn: 131604
 2011-05-18 23:58:37 +00:00
Jay Foad
53632b7c03 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
9d52ff5473 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
5000ba8961 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
5e537a9449 This patch removes some of useless instructions generated by bitfield access. 
llvm-svn: 127539
 2011-03-12 12:18:44 +00:00
Devang Patel
2f204229ef 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
061150ac1b Spelling fix: consequtive -> consecutive. 
llvm-svn: 125563
 2011-02-15 09:23:02 +00:00
Chris Lattner
c4cb20b9bf Move getOrEnforceKnownAlignment out of instcombine into Transforms/Utils. 
llvm-svn: 122554
 2010-12-25 20:37:57 +00:00
Dan Gohman
96e34e87ca 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
bd9edea8a3 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
678fd04aa5 Re-apply r111568 with a fix for the clang self-host. 
llvm-svn: 111665
 2010-08-20 18:24:43 +00:00
Owen Anderson
0e57acb623 Revert r111568 to unbreak clang self-host. 
llvm-svn: 111571
 2010-08-19 23:25:16 +00:00
Owen Anderson
7f2852ba2d 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
a80f89dbc7 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
96a9f8c7c6 mass elimination of reliance on automatic iterator dereferencing 
llvm-svn: 109103
 2010-07-22 13:36:47 +00:00
Gabor Greif
9f6b0059e4 cache result of operator* 
llvm-svn: 108150
 2010-07-12 15:48:26 +00:00
Gabor Greif
9e2aa5d5d7 do not repeatedly dereference use_iterator 
llvm-svn: 107962
 2010-07-09 12:23:50 +00:00
Dan Gohman
0d7d3faf8e 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
22d22caaed Teach instcombine to promote alloca array sizes. 
llvm-svn: 104945
 2010-05-28 15:09:00 +00:00
Duncan Sands
1b33dd3c83 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
2acaf3609c 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
0f04082970 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
e979c978e0 Use more specific types to avoid casts. No functionality change. 
llvm-svn: 94863
 2010-01-30 00:41:10 +00:00
Bob Wilson
71bc5f0787 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
f897b7b37e 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
e4d8ef8fc4 Keep ignoring pointer-to-pointer bitcasts 
llvm-svn: 94194
 2010-01-22 19:05:05 +00:00
Victor Hernandez
1cc721ee56 No need to look through bitcasts for DbgInfoIntrinsic 
llvm-svn: 94112
 2010-01-21 23:07:15 +00:00
Eric Christopher
5b602f9bf7 Fix comment. 
llvm-svn: 93831
 2010-01-19 01:20:15 +00:00
Chris Lattner
b55724e825 split out load/store/alloca. 
llvm-svn: 92685
 2010-01-05 05:57:49 +00:00