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160 Commits

Author SHA1 Message Date
Evan Cheng
d2c5eb864f Teach if-conversion about instructions that were already predicated, e.g. conditional move. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37964 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-07-06 23:24:39 +00:00
Evan Cheng
9ffd340daf Avoid if-converting simple block that ends with unconditional branch or fallthrough unless it branches / falls to the 'false' block. Not profitable, may end up increasing code size. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37660 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-19 21:45:13 +00:00
Evan Cheng
eaa91b0a1f Replace TargetInstrInfo::CanBeDuplicated() with a M_NOT_DUPLICABLE bit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37643 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-19 01:26:51 +00:00
Evan Cheng
c4047a8e96 Fix some fragile code wrt CFG edge updating. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37634 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-18 22:44:57 +00:00
Evan Cheng
a1a878791b Properly remove duplicate instructions as result of diamond if-conversion. Other bug fixes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37623 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-18 08:37:25 +00:00
Evan Cheng
e882fca902 Really turn if-converter loose: 
1. Consider all possible ifcvt cases at once. No longer restricted to bottom
   up iterative approach.
2. Sort all possible cases based on a cost function. Perform the most profitable
   ones first invalidate others that target the same blocks.
3. Fixed a number of bugs related to block duplication.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37613 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-16 09:34:52 +00:00
Evan Cheng
a2acf840a7 Not every predicable block can be safely duplicated. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37607 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-15 21:18:05 +00:00
Evan Cheng
bf9d02eaf6 MachineInstr::isPredicable() is no longer needed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37599 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-15 19:06:07 +00:00
Evan Cheng
9333545980 Extra edges are deleted later if needed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37593 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-15 17:34:48 +00:00
Evan Cheng
2c8c3a4a0d Allow small blocks to be duplicated to enable if-conversion. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37590 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-15 07:36:12 +00:00
Evan Cheng
bc198eeba6 No really, clear predcessors states. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37581 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-14 23:34:09 +00:00
Evan Cheng
e37e24331c If BB is predicated, invalidate its predecessor(s) which would if-convert it. It needs to be re-analyzed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37580 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-14 23:13:19 +00:00
Evan Cheng
b7c908bb81 Fix typo. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37577 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-14 21:26:08 +00:00
Evan Cheng
86ff296e63 Fix some stupid bugs that have effectively disabled if-conversion. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37575 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-14 20:28:52 +00:00
Evan Cheng
93a8e5ea0c Typo 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37566 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-13 00:04:00 +00:00
Evan Cheng
cc8fb46cdc Now if-converting all 4 variants of triangles. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37565 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-12 23:54:05 +00:00
Evan Cheng
9618bcaf7d Restructure code to reduce ifcvt compile time cost. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37543 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-11 22:26:22 +00:00
Reid Spencer
a9bf49c7e3 Fix the build. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37537 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-10 00:19:17 +00:00
Evan Cheng
1c9f91d7b2 Don't change CFG during analysis stage. Do so during ifcvt and invalidate predecessors accordingly. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37531 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-09 01:03:43 +00:00
Evan Cheng
7e75ba802e Carefully remove extraneous CFG edges after each ifcvt. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37529 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-08 22:01:07 +00:00
Evan Cheng
2acdbcccd8 Correct transfer predicate information. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37524 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-08 19:17:12 +00:00
Evan Cheng
edf4896a14 Hidden options to help debugging ifcvt issues. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37523 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-08 19:10:51 +00:00
Evan Cheng
ac5f142b9f Allow more cmp / bcc to be predicated; clean up triangle ifcvt checking code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37518 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-08 09:36:04 +00:00
Evan Cheng
27af5c414b Only remove the edge from entry to false if false block is merged. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37503 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-07 22:31:28 +00:00
Evan Cheng
f476961ae6 ifcvt a triangle: don't merge ifcvt block with rejoin block if it can fall through to it. If merged, the resulting block is not a candidate for iterative ifcvting since it contains both predicated and non-predicated code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37487 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-07 08:13:00 +00:00
Evan Cheng
d4de6d91b2 Lots of bug fixes. Now finally in a reasonable state. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37485 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-07 02:12:15 +00:00
Owen Anderson
96dd9a8b1b Quick patch to fix the build, based on what it appears Evan meant to write. 
Evan, please check that this is in fact correct.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37471 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-06 16:22:00 +00:00
Evan Cheng
7a655479ae Lots of bug fixes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37467 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-06 10:16:17 +00:00
Evan Cheng
3d6f60ec19 If a unconditional branch is added to branch to the false path during ifcvt, the predicated block cannot be iteratively ifcvted. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37456 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-06 02:08:52 +00:00
Evan Cheng
cb78d67a1a Minor statistics counting bug. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37451 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-06 01:12:44 +00:00
Evan Cheng
e705213b67 Fix a couple of typos and be smarter about order of blocks when ifcvt a diamond. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37449 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-06 00:57:55 +00:00
Evan Cheng
993fc9594e Fix diamond shape ifcvt bugs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37444 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-05 23:46:14 +00:00
Evan Cheng
a1a9f408da ReplaceUsesOfBlockWith() can modify the predecessors list. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37441 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-05 22:03:53 +00:00
Evan Cheng
e004317c66 Do not ifcvt if either true / false path is a backedge. Not profitable in almost all cases. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37440 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-05 20:38:42 +00:00
Evan Cheng
c53ef58a35 I had a senior moment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37433 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-05 07:05:25 +00:00
Evan Cheng
8ed680cce3 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. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37430 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-05 01:31:40 +00:00
Evan Cheng
f5305f9cc7 Fix some subtle bugs: bug during succeessor copying; incorrectly updating states of ifcvted blocks. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37429 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-05 00:07:37 +00:00
Evan Cheng
3ec425470f Forgot to check for if iterator reached the end. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37420 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-04 20:33:36 +00:00
Evan Cheng
b6665f62c5 Let IfConverter loose. Allow more aggressive subsumptions; reorder basic blocks to expose more ifcvt opportunities; code clean up and fixes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37409 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-04 06:47:22 +00:00
Evan Cheng
b5a0690788 Correctly mark early-exit on the false path. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37387 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-01 20:29:21 +00:00
Evan Cheng
8c52938e44 Ifcvt triangle: don't ifcvt 'true' BB if it has other predecessors; don't merge 'false' BB if it has other predecessors. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37382 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-01 07:41:07 +00:00
Evan Cheng
fe57a7e4df Remove a bogus check. Even terminators in a ifcvt need to be predicated. Unconditional branches can usually be converted to conditional ones. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37380 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-01 00:55:26 +00:00
Evan Cheng
5f70218c75 Allow multiple ifcvt candidates to share children blocks; add some debugging code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37379 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-06-01 00:12:12 +00:00
Evan Cheng
f15d44cc10 Fix a typo. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37374 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-05-31 20:53:33 +00:00
Evan Cheng
8258210ed4 Change traversal order to bottom up in preparation for more aggressive if-conversion. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37365 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-05-30 19:49:19 +00:00
Evan Cheng
58fbb9f5ba Don't merge in tail block of a diamond if it has more than one predecessors after if-conversion. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37353 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-05-29 23:37:20 +00:00
Evan Cheng
c8ed9badfa If there is an empty block between a source and its successor block, it still requires a unconditional branch. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37344 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-05-29 22:31:16 +00:00
Evan Cheng
4bec8ae694 Silly boog. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37328 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-05-25 00:59:01 +00:00
Evan Cheng
a13aa95bc8 Preliminary iterative if-conversion support. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37309 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-05-23 07:23:16 +00:00
Evan Cheng
a6b4f43eaa If-convert early exit blocks (returns, etc.); bug fixes, etc. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37270 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-05-21 22:22:58 +00:00