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15 Commits

Author SHA1 Message Date
Benjamin Kramer
239fd44f7a SCEVExpander: Don't crash when trying to merge two constant phis. 
Just constant fold them so they can't cause any trouble. Fixes PR12627.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166286 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-10-19 16:37:30 +00:00
Andrew Trick
dba95737e0 Remove redundant -enable-iv-rewrite=false flags from test cases. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153255 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-22 17:09:04 +00:00
Andrew Trick
ee98aa8743 Extended replaceCongruentPhis to handle mixed phi types. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147707 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-01-07 01:12:09 +00:00
Andrew Trick
204494149b Move replaceCongruentIVs into SCEVExapander and bias toward "expanded" 
IVs.

Indvars previously chose randomly between congruent IVs. Now it will
bias the decision toward IVs that SCEVExpander likes to create. This
was not done to fix any problem, it's just a welcome side effect of
factoring code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141633 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-10-11 02:28:51 +00:00
Andrew Trick
f21bdf4f42 Rename -disable-iv-rewrite to -enable-iv-rewrite=false in preparation for default change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139517 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-09-12 18:28:44 +00:00
Andrew Trick
86c98145b2 indvars: Added getInsertPointForUses to find a valid place to truncate the IV. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135568 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-07-20 05:32:06 +00:00
Andrew Trick
9e92152f77 indvars test case for r135558. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135559 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-07-20 02:14:37 +00:00
Andrew Trick
f22d95749a indvars -disable-iv-rewrite fix: derived GEP IVs 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135558 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-07-20 02:08:58 +00:00
Andrew Trick
037d1c0c7e indvars -disable-iv-rewrite: Added SimplifyCongruentIVs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134530 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-07-06 20:50:43 +00:00
Andrew Trick
4b02915386 indvars -disable-iv-rewrite: bug fix involving weird geps and related cleanup. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134306 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-07-02 02:34:25 +00:00
Andrew Trick
6e0ce24e0c indvars -disable-iv-rewrite: handle cloning binary operators that cannot overflow. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134177 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-30 19:02:17 +00:00
Andrew Trick
60ac719c85 indvars -disable-iv-rewrite: handle an edge case involving identity phis. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134124 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-30 01:27:23 +00:00
Andrew Trick
cc359d9fa2 indvars -disable-iv-rewrite: insert new trunc instructions carefully. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134112 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-29 23:03:57 +00:00
Andrew Trick
11745d4c02 indvars -disable-iv-rewrite: just because SCEV ignores casts doesn't 
mean they can be removed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134054 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-06-29 03:13:40 +00:00
Andrew Trick
03d3d3b361 indvars: fixed IV cloning in -disable-iv-rewrite mode with associated 
cleanup and overdue test cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132038 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-05-25 04:42:22 +00:00