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34 Commits

Author SHA1 Message Date
Chris Lattner
10673b63b0 Fix a problem exposed by the et-forest work. Load-vn needs these passes live 
whenever it is live, not just when load-vn is computed initially


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25146 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-01-08 09:10:04 +00:00
Andrew Lenharth
c826aea982 the correct fix was to fix AliasAnalysis.getModRefInfo 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22268 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-20 15:25:22 +00:00
Andrew Lenharth
e3e1739b7d prevent GCSE from forwarding stores to loads around vaarg. This is uggly, and I am trying to fix the AliasInfo, as it should catch the problem instead. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22266 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-06-20 15:02:05 +00:00
Misha Brukman
2b37d7cf28 Remove trailing whitespace 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21416 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-21 21:13:18 +00:00
Chris Lattner
3725c12b26 Due to previous simplifications, we can simplify the data structures being 
used here.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19913 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-29 07:04:10 +00:00
Chris Lattner
ee379a16ee Properly handle volatile. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19912 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-29 06:42:34 +00:00
Chris Lattner
4f16bd7a74 Remove some useless map operations. Loads/stores that are in the same 
BB as the load are not included in the Cand* sets at all.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19911 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-29 06:39:25 +00:00
Chris Lattner
15774df4d3 Before doing expensive global analysis, check to make sure the pointer is 
not invalidated on entry and on exit of the block.  This fixes some N^2
behavior in common cases, and speeds up gcc another 5% to 22.35s.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19910 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-29 06:31:53 +00:00
Chris Lattner
e212d62a34 Minor simplification/speedup. Replaces a set lookup with a pointer comparison. 
This speeds up 176.gcc from 25.73s to 23.48s, which is 9.5%


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19907 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-29 06:20:55 +00:00
Chris Lattner
e233b8c64b Eliminate generality that is not buying us anything. In particular, this 
will cause us to miss cases where the input pointer to a load could be value
numbered to another load.  Something like this:


  %X = load int* %P1
  %Y = load int* %P2

Those are obviously the same if P1/P2 are the same.  The code this patch
removes attempts to handle that.  However, since GCSE iterates, this doesn't
actually buy us anything: GCSE will first replace P1 or P2 with the other
one, then the load can be value numbered as equal.

Removing this code speeds up gcse a lot.  On 176.gcc in debug mode, this
speeds up gcse from 29.08s -> 25.73s, a 13% savings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19906 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-29 06:11:16 +00:00
Chris Lattner
2652da6af9 If we see: 
%A = alloca int
  %V = load int* %A

value number %V to undef, not 0.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19905 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-29 05:57:01 +00:00
Chris Lattner
fd4b3c4774 Eliminate a virtual method call 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18964 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-15 18:14:04 +00:00
Alkis Evlogimenos
20aa474f8f Fixes to make LLVM compile with vc7.1. 
Patch contributed by Paolo Invernizzi!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16152 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-09-03 18:19:51 +00:00
Misha Brukman
47b14a4a6a Fix #includes of i*.h => Instructions.h as per PR403. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15334 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-07-29 17:30:56 +00:00
Brian Gaeke
96d4bf7aee Make the create...() functions for some of these passes return a FunctionPass *. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15276 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-07-27 17:43:21 +00:00
Chris Lattner
0f312d6998 Implement the interfaces to update value numbering information. Add an 
assert.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13679 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-05-23 21:13:24 +00:00
Chris Lattner
5da80974c0 Implement test/Regression/Transforms/GCSE/undefined_load.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12641 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-04-03 00:45:16 +00:00
Chris Lattner
002be76733 Add some missing functions. Make sure to handle calls together in case the 
client has another VN implementation that can VN calls.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12427 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-03-16 03:41:35 +00:00
Chris Lattner
5a6e947f1d Implement CSE of call instructions in the most trivial case. This implements 
GCSE/call_cse.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12419 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-03-15 05:44:59 +00:00
Chris Lattner
3b303d91d7 In a "seeing the forest through the trees" kinda situation, I realized that a 
complete rewrite of load-vn will make it a bit faster.  This changes speeds up
the gcse pass (which uses load-vn) from 25.45s to 0.42s on the testcase in
PR209.

I've also verified that this gives the exact same results as the old one.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11132 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-05 17:20:00 +00:00
Chris Lattner
57ef9a2392 This is a big diff with no functionality change. We just reorder some code, 
which causes big reindentation.  While I'm at it, I fix the fixme by removing
some dead code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11131 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-05 05:56:23 +00:00
Chris Lattner
270db367e0 finegrainify namespacification 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11130 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-05 05:51:40 +00:00
Tanya Lattner
1ad5bc5616 Fixed Chris' typo. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11128 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-05 04:45:21 +00:00
Chris Lattner
adf9b90411 Implement optimizations for handling large basic blocks. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11126 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-02-05 00:36:43 +00:00
Brian Gaeke
d0fde30ce8 Put all LLVM code into the llvm namespace, as per bug 109. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9903 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-11-11 22:41:34 +00:00
John Criswell
b576c94c15 Added LLVM project notice to the top of every C++ source file. 
Header files will be on the way.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9298 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-10-20 19:43:21 +00:00
Misha Brukman
2f2d06506c Fixed spelling and grammar. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8478 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-09-11 18:14:24 +00:00
Misha Brukman
7bc439a4b6 Spell `definitely' correctly. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8466 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-09-11 15:31:17 +00:00
Chris Lattner
bd70a31c51 Fix bug: RLE-Preserve-Volatile.ll 
Volatile loads and stores must not be value numbered


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8398 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-09-08 18:13:58 +00:00
Misha Brukman
5560c9d49c Spell `necessary' correctly. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7944 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-08-18 14:43:39 +00:00
Chris Lattner
aed2c6d2cb If the alias analysis algorithm we are using can provide MUST alias information, 
expose it directly as value numbering information


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6972 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-29 00:53:34 +00:00
Chris Lattner
28c6cf22de Implement forwarding from stores to loads of must-aliased pointers. 
This implements: GCSE/2003-06-13-LoadStoreEliminate.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6694 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-16 12:06:41 +00:00
Chris Lattner
f98d8d8611 Calculate and pass load sizes to the alias analysis infrastructure 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5635 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-02-26 19:27:35 +00:00
Chris Lattner
71c7ec9b18 Initial implementation of value numbering for load instructions 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3540 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-08-30 20:28:10 +00:00