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4526 Commits

Author SHA1 Message Date
Dan Gohman 72e66eedb8 Use Function::getEntryBlock() instead of Function::front(), for clarity. 
llvm-svn: 57870
 2008-10-21 03:10:28 +00:00
Dan Gohman fa29b67aee Fix a bug that prevented llvm-extract -delete from working. 
llvm-svn: 57864
 2008-10-21 01:08:07 +00:00
Dan Gohman 215742a966 Use 0 instead of false to return a null pointer. 
llvm-svn: 57660
 2008-10-17 00:56:52 +00:00
Dan Gohman bc0278400c Teach instcombine's visitLoad to scan back several instructions 
to find opportunities for store-to-load forwarding or load CSE,
in the same way that visitStore scans back to do DSE. Also, define
a new helper function for testing whether the addresses of two
memory accesses are known to have the same value, and use it in
both visitStore and visitLoad.

These two changes allow instcombine to eliminate loads in code
produced by front-ends that frequently emit obviously redundant
addressing for memory references.

llvm-svn: 57608
 2008-10-15 23:19:35 +00:00
Evan Cheng d885f6e139 Combine (fcmp cc0 x, y) | (fcmp cc1 x, y) into a single fcmp when possible. 
llvm-svn: 57515
 2008-10-14 18:44:08 +00:00
Evan Cheng ce70752b11 - Somehow I forgot about one / une. 
- Renumber fcmp predicates to match their icmp counterparts.
- Try swapping operands to expose more optimization opportunities.

llvm-svn: 57513
 2008-10-14 18:13:38 +00:00
Evan Cheng 67786cce66 Optimize anding of two fcmp into a single fcmp if the operands are the same. e.g. uno && ueq -> ueq 
ord && olt -> olt
     ord && ueq -> oeq

llvm-svn: 57507
 2008-10-14 17:15:11 +00:00
Matthijs Kooijman f7d3cb5435 Make InstructionCombining::getBitCastOperand() recognize GEP instructions and 
constant expression with all zero indices as being the same as a bitcast.

llvm-svn: 57442
 2008-10-13 15:17:01 +00:00
Chris Lattner da435910e8 Fix PR2697 by rewriting the '(X / pos) op neg' logic. This also changes 
a couple other cases for clarity, but shouldn't affect correctness.

Patch by Eli Friedman!

llvm-svn: 57387
 2008-10-11 22:55:00 +00:00
Devang Patel 647a1e532b Check loop exit predicate properly while eliminating one iteration loop. 
This patch fixes PR 2869

llvm-svn: 57369
 2008-10-10 22:02:57 +00:00
Nuno Lopes e3127f3f80 fix memleak by cleaning the global sets on pass exit 
llvm-svn: 57353
 2008-10-10 16:25:50 +00:00
Dale Johannesen 4f0bd68cfe Add a "loses information" return value to APFloat::convert 
and APFloat::convertToInteger.  Restore return value to
IEEE754.  Adjust all users accordingly.

llvm-svn: 57329
 2008-10-09 23:00:39 +00:00
Nick Lewycky 03c5fa18f1 Don't drop alignment on globals when cloning. 
llvm-svn: 57320
 2008-10-09 06:27:14 +00:00
Nuno Lopes 06c67f88d7 dont specialize weak functions and the like 
llvm-svn: 57305
 2008-10-08 18:45:59 +00:00
Duncan Sands 26ff6f9c54 Add <cstdio> include where needed by gcc-4.4. 
Patch by Samuel Tardieu.

llvm-svn: 57291
 2008-10-08 07:23:46 +00:00
Chris Lattner 42d5785dbd Add parentheses to avoid warnings in GCC 4.4.0, 
patch by Samuel Tardieu!

llvm-svn: 57288
 2008-10-08 06:42:28 +00:00
Andrew Lenharth 5aa1cc4065 Correctly set attributes when removing args during cloning. Fixes PR2765 
llvm-svn: 57254
 2008-10-07 18:08:38 +00:00
Devang Patel 40aafce00d Fix typo, fix PR 2865. 
llvm-svn: 57221
 2008-10-06 23:22:54 +00:00
Matthijs Kooijman cbe5e16eb5 Allow scalarrepl to treat an all-zero GEP just as bitcast. 
This includes not marking a GEP involving a vector as unsafe, but only when it
has all zero indices. This allows scalarrepl to work in a few more cases.

llvm-svn: 57177
 2008-10-06 16:23:31 +00:00
Chris Lattner 917a6c1343 rewrite bswap matching to be more general, allowing arbitrary 
shifting and masking inside a bswap expr.  This allows it to handle
the cases from PR2842, which involve the intermediate 'or' 
expressions being shifted, not just the input value.

llvm-svn: 57095
 2008-10-05 02:13:19 +00:00
Chris Lattner ca91f265c4 fix a bug where the bswap matcher could match a case involving 
ashr.  It should only apply to lshr.

llvm-svn: 57089
 2008-10-05 00:50:57 +00:00
Duncan Sands 1d35e9aebe Ignore loads from and stores to local memory (i.e. allocas) 
when deciding whether to mark a function readnone/readonly.
Since the pass is currently run before SROA, this may be
quite helpful.  Requested by Chris on IRC.

llvm-svn: 57050
 2008-10-04 13:24:24 +00:00
Dan Gohman e21903987f Clean up some multiple-return-value code that is no longer 
applicable.

llvm-svn: 57033
 2008-10-03 22:21:24 +00:00
Devang Patel f963403b58 Nick Lewycky's patch. 
While hosting instruction check PHI node.

llvm-svn: 57025
 2008-10-03 18:57:37 +00:00
Duncan Sands 3a813a5d3f Teach internalize to preserve the callgraph. 
Why?  Because it was there!

llvm-svn: 56996
 2008-10-03 07:36:09 +00:00
Owen Anderson cb4f156b6b SplitBlock should only attempt to update LoopInfo if it is actually being used. 
llvm-svn: 56994
 2008-10-03 06:55:35 +00:00
Duncan Sands d65a4daeea Factorize code: remove variants of "strip off 
pointer bitcasts and GEP's", and centralize the
logic in Value::getUnderlyingObject.  The
difference with stripPointerCasts is that
stripPointerCasts only strips GEPs if all
indices are zero, while getUnderlyingObject
strips GEPs no matter what the indices are.

llvm-svn: 56922
 2008-10-01 15:25:41 +00:00
Nuno Lopes 96740aad86 revert the addition of Preverves(CallGraph), per Duncan's comments 
llvm-svn: 56917
 2008-10-01 09:13:40 +00:00
Dan Gohman 67d90de2b0 Call ScalarEvolution's deleteValueFromRecords before deleting an 
instruction, not after. This fixes some uses of free'd memory.

llvm-svn: 56908
 2008-10-01 02:02:03 +00:00
Nuno Lopes 5093ab4c76 add preserversCFG() + preservers(CallGraph) 
llvm-svn: 56887
 2008-09-30 22:04:30 +00:00
Nuno Lopes 2bd7b24f1a add AU.setPreservesCFG() since this pass only adds and removes function attributes 
llvm-svn: 56868
 2008-09-30 18:34:38 +00:00
Nick Lewycky e8ced3ec19 Fix misoptimization of: xor i1 (icmp eq (X, C1), icmp s[lg]t (X, C2)) 
llvm-svn: 56834
 2008-09-30 06:08:34 +00:00
Duncan Sands 57512a1be4 Speed up these passes when the callgraph has 
huge simply connected components.  Suggested
by Chris.

llvm-svn: 56787
 2008-09-29 14:59:04 +00:00
Nuno Lopes ffc9da6772 remove redundant test (mayBeOverriden() includes hasLinkOnceLinkage) 
llvm-svn: 56786
 2008-09-29 14:40:32 +00:00
Duncan Sands e340e18783 Tweak some comments. 
llvm-svn: 56784
 2008-09-29 13:35:31 +00:00
Duncan Sands 08d91178e9 Rename isWeakForLinker to mayBeOverridden. Use it 
instead of hasWeakLinkage in a bunch of optimization
passes.

llvm-svn: 56782
 2008-09-29 11:25:42 +00:00
Devang Patel 9eb525d4f9 Implement function notes as function attributes. 
llvm-svn: 56716
 2008-09-26 23:51:19 +00:00
Devang Patel a05633e105 Now Attributes are divided in three groups 
- return attributes - inreg, zext and sext
- parameter attributes
- function attributes - nounwind, readonly, readnone, noreturn

Return attributes use 0 as the index.
Function attributes use ~0U as the index.

This patch requires corresponding changes in llvm-gcc and clang.

llvm-svn: 56704
 2008-09-26 22:53:05 +00:00
Devang Patel 4c758ea3e0 Large mechanical patch. 
s/ParamAttr/Attribute/g
s/PAList/AttrList/g
s/FnAttributeWithIndex/AttributeWithIndex/g
s/FnAttr/Attribute/g

This sets the stage 
- to implement function notes as function attributes and 
- to distinguish between function attributes and return value attributes.

This requires corresponding changes in llvm-gcc and clang.

llvm-svn: 56622
 2008-09-25 21:00:45 +00:00
Evan Cheng 25dd4a2daf Commit CodeGenPrepare.cpp changes which was accidentially left out of 56526. 
llvm-svn: 56549
 2008-09-24 06:48:55 +00:00
Eric Christopher c1ea149dcd Fix fallout in CodeGenPrepare from 56526. Will likely need more work. 
llvm-svn: 56546
 2008-09-24 05:32:41 +00:00
Devang Patel 6402c7236f s/ParamAttrsWithIndex/FnAttributeWithIndex/g 
llvm-svn: 56535
 2008-09-24 00:55:02 +00:00
Devang Patel e15607b7bb Put FN_NOTE_AlwaysInline and others in FnAttr namespace. 
llvm-svn: 56527
 2008-09-24 00:06:15 +00:00
Devang Patel e87abd26ba Move FN_NOTE_AlwaysInline and other out of ParamAttrs namespace. 
Do not check isDeclaration() in hasNote(). It is clients' responsibility.

llvm-svn: 56524
 2008-09-23 23:52:03 +00:00
Devang Patel ba3fa6c6e1 s/ParameterAttributes/Attributes/g 
llvm-svn: 56513
 2008-09-23 23:03:40 +00:00
Devang Patel 82fed6702b Use parameter attribute store (soon to be renamed) for 
Function Notes also. Function notes are stored at index ~0.

llvm-svn: 56511
 2008-09-23 22:35:17 +00:00
Devang Patel 329fe728b5 Add hasNote() to check note associated with a function. 
llvm-svn: 56477
 2008-09-22 22:32:29 +00:00
Oscar Fuentes a229b3c9a7 Initial support for the CMake build system. 
llvm-svn: 56419
 2008-09-22 01:08:49 +00:00
Duncan Sands e1dc84be64 Implement review feedback from Devang: make use 
of mayReadFromMemory and mayWriteToMemory.

llvm-svn: 56387
 2008-09-20 16:45:58 +00:00
Duncan Sands 310077034a Remove the MarkModRef pass (use AddReadAttrs instead). 
Unfortunately this means removing one regression test
of GlobalsModRef because I couldn't work out how to
perform it without MarkModRef.

llvm-svn: 56342
 2008-09-19 08:23:44 +00:00