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134 Commits

Author SHA1 Message Date
Owen Anderson cfb6f40424 Quick patch to fix the build, based on what it appears Evan meant to write. 
Evan, please check that this is in fact correct.

llvm-svn: 37471
 2007-06-06 16:22:00 +00:00
Evan Cheng 9030b98aca Lots of bug fixes. 
llvm-svn: 37467
 2007-06-06 10:16:17 +00:00
Evan Cheng e4ec918be0 If a unconditional branch is added to branch to the false path during ifcvt, the predicated block cannot be iteratively ifcvted. 
llvm-svn: 37456
 2007-06-06 02:08:52 +00:00
Evan Cheng b30a89457c Minor statistics counting bug. 
llvm-svn: 37451
 2007-06-06 01:12:44 +00:00
Evan Cheng 30565998bb Fix a couple of typos and be smarter about order of blocks when ifcvt a diamond. 
llvm-svn: 37449
 2007-06-06 00:57:55 +00:00
Evan Cheng 7948422b78 Fix diamond shape ifcvt bugs. 
llvm-svn: 37444
 2007-06-05 23:46:14 +00:00
Evan Cheng c1a0b8ce1d ReplaceUsesOfBlockWith() can modify the predecessors list. 
llvm-svn: 37441
 2007-06-05 22:03:53 +00:00
Evan Cheng 3e5bf0827c Do not ifcvt if either true / false path is a backedge. Not profitable in almost all cases. 
llvm-svn: 37440
 2007-06-05 20:38:42 +00:00
Evan Cheng 2c1acd6d9e I had a senior moment. 
llvm-svn: 37433
 2007-06-05 07:05:25 +00:00
Evan Cheng 6e4babe8cc If the predicated block requires an early exit, end the block there and add a unconditional branch to false block. AnalyzeBranch() does not understand early exits. 
llvm-svn: 37430
 2007-06-05 01:31:40 +00:00
Evan Cheng 17aad8164e Fix some subtle bugs: bug during succeessor copying; incorrectly updating states of ifcvted blocks. 
llvm-svn: 37429
 2007-06-05 00:07:37 +00:00
Evan Cheng 91233153bf Forgot to check for if iterator reached the end. 
llvm-svn: 37420
 2007-06-04 20:33:36 +00:00
Evan Cheng 312b723af2 Let IfConverter loose. Allow more aggressive subsumptions; reorder basic blocks to expose more ifcvt opportunities; code clean up and fixes. 
llvm-svn: 37409
 2007-06-04 06:47:22 +00:00
Evan Cheng 4dcf1e8582 Correctly mark early-exit on the false path. 
llvm-svn: 37387
 2007-06-01 20:29:21 +00:00
Evan Cheng 6a2cf070cc Ifcvt triangle: don't ifcvt 'true' BB if it has other predecessors; don't merge 'false' BB if it has other predecessors. 
llvm-svn: 37382
 2007-06-01 07:41:07 +00:00
Evan Cheng 95c7917d92 Remove a bogus check. Even terminators in a ifcvt need to be predicated. Unconditional branches can usually be converted to conditional ones. 
llvm-svn: 37380
 2007-06-01 00:55:26 +00:00
Evan Cheng 20e05997f5 Allow multiple ifcvt candidates to share children blocks; add some debugging code. 
llvm-svn: 37379
 2007-06-01 00:12:12 +00:00
Evan Cheng e6ccb6c5ed Fix a typo. 
llvm-svn: 37374
 2007-05-31 20:53:33 +00:00
Evan Cheng 905a8f4940 Change traversal order to bottom up in preparation for more aggressive if-conversion. 
llvm-svn: 37365
 2007-05-30 19:49:19 +00:00
Evan Cheng 20f7d30f92 Don't merge in tail block of a diamond if it has more than one predecessors after if-conversion. 
llvm-svn: 37353
 2007-05-29 23:37:20 +00:00
Evan Cheng c2237ce217 If there is an empty block between a source and its successor block, it still requires a unconditional branch. 
llvm-svn: 37344
 2007-05-29 22:31:16 +00:00
Evan Cheng 13f5f7df95 Silly boog. 
llvm-svn: 37328
 2007-05-25 00:59:01 +00:00
Evan Cheng d0e669199b Preliminary iterative if-conversion support. 
llvm-svn: 37309
 2007-05-23 07:23:16 +00:00
Evan Cheng e26c0916a3 If-convert early exit blocks (returns, etc.); bug fixes, etc. 
llvm-svn: 37270
 2007-05-21 22:22:58 +00:00
Evan Cheng 018cffbca4 Clean up. 
llvm-svn: 37237
 2007-05-18 19:32:08 +00:00
Evan Cheng faaf716540 Change to depth-first traversal. 
llvm-svn: 37236
 2007-05-18 19:26:33 +00:00
Evan Cheng 2e82cefd24 Some restructuring in preparation for most aggressive if-conversion. 
llvm-svn: 37231
 2007-05-18 18:14:37 +00:00
Evan Cheng f25d3a5d73 Watch out for blocks that end with a return. 
llvm-svn: 37227
 2007-05-18 17:06:53 +00:00
Evan Cheng 478b805956 If true / false blocks fallthrough before ifcvt, add unconditional branches to ifcvt'd block. 
llvm-svn: 37200
 2007-05-18 01:55:58 +00:00
Evan Cheng 0f745da4fe Make use of target specific block size limits; bug fixes. 
llvm-svn: 37195
 2007-05-18 00:20:58 +00:00
Evan Cheng af71610429 isBlockPredicable() always ignore terminal instructions; add comments. 
llvm-svn: 37126
 2007-05-16 21:54:37 +00:00
Evan Cheng 5ea933a009 Rename M_PREDICATED to M_PREDICABLE; Moved isPredicable() to MachineInstr. 
llvm-svn: 37121
 2007-05-16 20:56:08 +00:00
Evan Cheng 35fc2119b0 Devang points out that we need an assertion here. 
llvm-svn: 37097
 2007-05-16 05:11:10 +00:00
Evan Cheng f5e53a58db Initial commit of (very basic) if converter. 
llvm-svn: 37092
 2007-05-16 02:00:57 +00:00