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19085 Commits

Author SHA1 Message Date
Chris Lattner 481e28b1f5 Implement two xforms: 
1. ~(~X | Y) === (X & ~Y)
2. (A|B) & ~(A&B) -> A^B

This allows us to transform  ~(~(a|b) | (a&b)) -> a^b.

This implements PR1510 for scalar values.

llvm-svn: 37584
 2007-06-15 05:58:24 +00:00
Chris Lattner f14e5175ed delete some obviously dead vector operations, which deletes a few thousand 
operations from Duraids example.

llvm-svn: 37582
 2007-06-15 05:26:55 +00:00
Evan Cheng add977670f No really, clear predcessors states. 
llvm-svn: 37581
 2007-06-14 23:34:09 +00:00
Evan Cheng 9fc56c079d 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
Dan Gohman 5c4413120f Rename MVT::getVectorBaseType to MVT::getVectorElementType. 
llvm-svn: 37579
 2007-06-14 22:58:02 +00:00
Dale Johannesen 616627b002 Do not treat FP_REG_KILL as terminator in branch analysis (X86). 
llvm-svn: 37578
 2007-06-14 22:03:45 +00:00
Evan Cheng e08f0eefa6 Fix typo. 
llvm-svn: 37577
 2007-06-14 21:26:08 +00:00
Dan Gohman 4a4a8eb00e Add a target hook to allow loads from constant pools to be rematerialized, and an 
implementation for x86.

llvm-svn: 37576
 2007-06-14 20:50:44 +00:00
Evan Cheng 1e6f08b2a2 Fix some stupid bugs that have effectively disabled if-conversion. 
llvm-svn: 37575
 2007-06-14 20:28:52 +00:00
Dan Gohman 3a8e2a8b2f Eliminate some redundant newlines in asm output. 
llvm-svn: 37574
 2007-06-14 15:00:27 +00:00
Christopher Lamb f274efef9f Add support to tablegen for specifying subregister classes on a per register class basis. 
llvm-svn: 37572
 2007-06-13 22:20:15 +00:00
Dale Johannesen c68554683d Handle blocks with 2 unconditional branches in AnalyzeBranch. 
llvm-svn: 37571
 2007-06-13 17:59:52 +00:00
Duncan Sands 7413736a7e Only correctly lower exception handing intrinsics if exception handling is 
turned on.  Likewise for scanning of invokes to mark landing pads.

llvm-svn: 37570
 2007-06-13 16:53:21 +00:00
Dan Gohman 26455c4ae0 Introduce new SelectionDAG node opcodes VEXTRACT_SUBVECTOR and 
VCONCAT_VECTORS. Use these for CopyToReg and CopyFromReg legalizing in
the case that the full register is to be split into subvectors instead
of scalars. This replaces uses of VBIT_CONVERT to present values as
vector-of-vector types in order to make whole subvectors accessible via
BUILD_VECTOR and EXTRACT_VECTOR_ELT.

This is in preparation for adding extended ValueType values, where
having vector-of-vector types is undesirable.

llvm-svn: 37569
 2007-06-13 15:12:02 +00:00
Dan Gohman cbd51c8b60 When creating CopyFromReg nodes, always use legal types. And use the 
correct types for the result vector, even though it is currently bitcasted
to a different type immediately.

llvm-svn: 37568
 2007-06-13 14:55:16 +00:00
Duncan Sands 97f7236e70 The fix that was applied for PR1224 stops the compiler 
crashing but breaks exception handling.  The problem
described in PR1224 is that invoke is a terminator that
can produce a value.  The value may be needed in other
blocks.  The code that writes to registers values needed
in other blocks runs before terminators are lowered (in
this case invoke) so asserted because the value was not
yet available.  The fix that was applied was to do invoke
lowering earlier, before writing values to registers.

The problem this causes is that the code to copy values
to registers can be output after the invoke call.  If
an exception is raised and control is passed to the
landing pad then this copy-code will never execute.  If
the value is needed in some code path reached via the
landing pad then that code will get something bogus.

So revert the original fix and simply skip invoke values
in the general copying to registers code.  Instead copy
the invoke value to a register in the invoke lowering code.

llvm-svn: 37567
 2007-06-13 05:51:31 +00:00
Evan Cheng cbaaff58bf Typo 
llvm-svn: 37566
 2007-06-13 00:04:00 +00:00
Evan Cheng 9acfa7b063 Now if-converting all 4 variants of triangles. 
llvm-svn: 37565
 2007-06-12 23:54:05 +00:00
Owen Anderson 4036ad485f Fix test/Transforms/GVNPRE/2007-06-12-PhiTranslate.ll 
llvm-svn: 37564
 2007-06-12 22:43:57 +00:00
Devang Patel 149a7616dc isReachableFromEntry() is not suitable for post dominator. 
llvm-svn: 37562
 2007-06-12 17:50:25 +00:00
Devang Patel 47419ee142 Remove redundant check. 
llvm-svn: 37561
 2007-06-12 17:35:20 +00:00
Devang Patel dcf0c03ff7 Check A dominates B and vise versa first while searching for nearest 
common dominator.

llvm-svn: 37559
 2007-06-12 17:17:57 +00:00
Owen Anderson 4276984012 Refactor some code, and fix test/Transforms/GVNPRE/2007-06-12-NoExit.ll by being more careful when using 
post-dominator information.

llvm-svn: 37556
 2007-06-12 16:57:50 +00:00
Dale Johannesen edfec0b515 Sink CmpInst's to their uses to reduce register pressure. 
llvm-svn: 37554
 2007-06-12 16:50:17 +00:00
Devang Patel a6ff5bf9ba Break DominatorTree from ETNode. 
Remove unused PostETForest.

llvm-svn: 37551
 2007-06-12 00:54:38 +00:00
Owen Anderson a75dd4dc56 Fix a few more bugs, including an instance of walking in reverse topological rather than topological order. This 
fixes a testcase extracted from llvm-test.

llvm-svn: 37550
 2007-06-12 00:50:47 +00:00
Devang Patel d324360352 Use SmallPtrSet instaed of std::set 
llvm-svn: 37548
 2007-06-12 00:40:51 +00:00
Devang Patel 9576fac800 Check immediate dominators first while searching for nearset common dominator. 
Fix 80 col violations.

llvm-svn: 37547
 2007-06-12 00:35:38 +00:00
Devang Patel 88ea2dbc68 Maintain DFS number in DomTreeNode itself. 
This means now ETNodes are not useful anymore.

llvm-svn: 37546
 2007-06-12 00:14:41 +00:00
Devang Patel 78b9c68164 Add and use DominatorTreeBase::findNearestCommonDominator(). 
llvm-svn: 37545
 2007-06-11 23:31:22 +00:00
Lauro Ramos Venancio 4c2f003971 Fix a typo in bswap lowering. 
llvm-svn: 37544
 2007-06-11 23:16:16 +00:00
Evan Cheng 4dd31a7b1b Restructure code to reduce ifcvt compile time cost. 
llvm-svn: 37543
 2007-06-11 22:26:22 +00:00
Devang Patel 536ac4dca7 Simplify. 
llvm-svn: 37542
 2007-06-11 21:45:31 +00:00
Devang Patel d18054afcf simplify 
llvm-svn: 37541
 2007-06-11 21:25:31 +00:00
Devang Patel ab2eee89a4 Simplify. Dominator Tree is required so always available. 
llvm-svn: 37540
 2007-06-11 21:18:00 +00:00
Owen Anderson d184c18074 Handle functions with multiple exit blocks properly. 
llvm-svn: 37539
 2007-06-11 16:25:17 +00:00
Devang Patel c43f32b935 Use DominatorTree instead of ETForest. 
llvm-svn: 37538
 2007-06-11 15:40:48 +00:00
Reid Spencer 14b62a553e Fix the build. 
llvm-svn: 37537
 2007-06-10 00:19:17 +00:00
Owen Anderson 223718c40e Perform PRE of comparison operators. 
llvm-svn: 37536
 2007-06-09 18:35:31 +00:00
Chris Lattner 75372ad603 fix x86-64 mmx calling convention for real, which passes in integer gprs. 
llvm-svn: 37534
 2007-06-09 05:08:10 +00:00
Chris Lattner a4a49e37ab fix mmx handling bug 
llvm-svn: 37533
 2007-06-09 05:01:50 +00:00
Nick Lewycky d18b16034a Fix edge case. 
llvm-svn: 37532
 2007-06-09 04:20:33 +00:00
Evan Cheng 2117d1f20e 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
Owen Anderson 7d76b2a774 Collect statistics from GVN-PRE. 
llvm-svn: 37530
 2007-06-08 22:02:36 +00:00
Evan Cheng 288f1545a6 Carefully remove extraneous CFG edges after each ifcvt. 
llvm-svn: 37529
 2007-06-08 22:01:07 +00:00
Evan Cheng 5514bbef46 Add a utility routine to check for unpredicated terminator instruction. 
llvm-svn: 37528
 2007-06-08 21:59:56 +00:00
Lauro Ramos Venancio c7ebbaa10e Define AsmTransCBE for ARM. 
llvm-svn: 37527
 2007-06-08 21:06:23 +00:00
Owen Anderson b232efaf48 Fix typo in a comment. 
llvm-svn: 37526
 2007-06-08 20:57:08 +00:00
Owen Anderson 55994f2453 Fix a bug that was causing the elimination phase not to replace values when it should be. 
With this patch, GVN-PRE now correctly optimizes the example from the thesis.

Many thanks to Daniel Berlin for helping me find errors in this.

llvm-svn: 37525
 2007-06-08 20:44:02 +00:00
Evan Cheng df1a42935b Correct transfer predicate information. 
llvm-svn: 37524
 2007-06-08 19:17:12 +00:00