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117 Commits

Author SHA1 Message Date
Chris Lattner
5af0ef5c44 Do not delete the entry block to a function. 
llvm-svn: 18795
 2004-12-11 05:32:19 +00:00
Chris Lattner
943f94d2b3 Implement Transforms/SCCP/ipsccp-gvar.ll, by tracking values stored to 
non-address-taken global variables.

llvm-svn: 18790
 2004-12-11 05:15:59 +00:00
Chris Lattner
beeab3a124 Fix a bug where we could delete dead invoke instructions with uses. 
In functions where we fully constant prop the return value, replace all
ret instructions with 'ret undef'.

llvm-svn: 18786
 2004-12-11 02:53:57 +00:00
Chris Lattner
d1d00e017b Implement SCCP/ipsccp-conditional.ll, by totally deleting dead blocks. 
llvm-svn: 18781
 2004-12-10 22:29:08 +00:00
Chris Lattner
5be2c2e299 Fix SCCP/2004-12-10-UndefBranchBug.ll 
llvm-svn: 18776
 2004-12-10 20:41:50 +00:00
Chris Lattner
ead42a768e This is the initial implementation of IPSCCP, as requested by Brian. 
This implements SCCP/ipsccp-basic.ll, rips apart Olden/mst (as described in
PR415), and does other nice things.

There is still more to come with this, but it's a start.

llvm-svn: 18752
 2004-12-10 08:02:06 +00:00
Chris Lattner
92e712b00f Do not delete dead invoke instructions! 
llvm-svn: 17897
 2004-11-16 16:32:28 +00:00
Chris Lattner
f95f7e05a5 Minor cleanups. There is no reason for SCCP to derive from instvisitor anymore. 
llvm-svn: 17825
 2004-11-15 07:15:04 +00:00
Chris Lattner
4aa7dc02bf Count more accurately 
llvm-svn: 17824
 2004-11-15 07:02:42 +00:00
Chris Lattner
e87a1360b3 Two minor improvements: 
1. Speedup getValueState by having it not consider Arguments.  It's better
    to just add them before we start SCCP'ing.
 2. SCCP can delete the contents of dead blocks.  No really, it's ok!  This
    reduces the size of the IR for subsequent passes, even though
    simplifycfg would do the same job.  In practice, simplifycfg does not
    run until much later than sccp in gccas

llvm-svn: 17820
 2004-11-15 05:45:33 +00:00
Chris Lattner
4ad574191b rename InstValue to LatticeValue, as it holds for more than instructions. 
llvm-svn: 17818
 2004-11-15 05:03:30 +00:00
Chris Lattner
bde8da9e43 Substantially refactor the SCCP class into an SCCP pass and an SCCPSolver 
class.  The only changes are minor:

 * Do not try to SCCP instructions that return void in the rewrite loop.
   This is silly and fool hardy, wasting a map lookup and adding an entry
   to the map which is never used.
 * If we decide something has an undefined value, rewrite it to undef,
   potentially leading to further simplications.

llvm-svn: 17816
 2004-11-15 04:44:20 +00:00
Chris Lattner
dd0094e4ed Convert 'struct' to 'class' in various places to adhere to the coding standards 
and work better with VC++.  Patch contributed by Morten Ofstad!

llvm-svn: 17281
 2004-10-27 16:14:51 +00:00
Chris Lattner
80f963c30b Handle undef values as undefined on the constant lattice 
ignore unreachable instructions

llvm-svn: 17044
 2004-10-16 18:09:41 +00:00
Chris Lattner
f8a6e4402e Use DEBUG instead of DebugFlag directly, as DebugFlag does not respect 
-debug-only!

llvm-svn: 16868
 2004-10-09 19:30:36 +00:00
Chris Lattner
c137c9ac39 Prototype these functions more accurately 
llvm-svn: 16432
 2004-09-20 04:43:15 +00:00
Reid Spencer
c6a8d70cff Convert code to compile with vc7.1. 
Patch contributed by Paolo Invernizzi. Thanks Paolo!

llvm-svn: 16368
 2004-09-15 17:06:42 +00:00
Reid Spencer
c4abcbefb1 Changes For Bug 352 
Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.

llvm-svn: 16137
 2004-09-01 22:55:40 +00:00
Alkis Evlogimenos
f853362a44 Stop using getValues(). 
llvm-svn: 15487
 2004-08-04 08:44:43 +00:00
Reid Spencer
6d26720976 Delete a redundant if branch. 
llvm-svn: 14967
 2004-07-18 08:34:52 +00:00
Reid Spencer
2a8914b64b bug 122: 
- Replace ConstantPointerRef usage with GlobalValue usage
- Correct isa<Constant> for GlobalValue subclass

llvm-svn: 14947
 2004-07-18 00:31:05 +00:00
Chris Lattner
952bbd726b This patch was contributed by Daniel Berlin! 
Speed up SCCP substantially by processing overdefined values quickly.  This
patch speeds up SCCP by about 30-40% on large testcases.

llvm-svn: 14861
 2004-07-15 23:36:43 +00:00
Chris Lattner
0f61d55197 Fixes working towards PR341 
llvm-svn: 14839
 2004-07-15 01:50:47 +00:00
Chris Lattner
545e77c9d5 Add SCCP support for constant folding calls, implementing: 
test/Regression/Transforms/SCCP/calltest.ll

llvm-svn: 12921
 2004-04-13 19:43:54 +00:00
Chris Lattner
9236135e8f Support getelementptr instructions which use uint's to index into structure 
types and can have arbitrary 32- and 64-bit integer types indexing into
sequential types.

llvm-svn: 12653
 2004-04-05 01:30:19 +00:00
Chris Lattner
dc22f37eb5 Do not try to optimize PHI nodes with incredibly high degree. This reduces SCCP 
time from 615s to 1.49s on a large testcase that has a gigantic switch statement
that all of the blocks in the function go to (an intepreter).

llvm-svn: 12442
 2004-03-16 19:49:59 +00:00
Chris Lattner
6b127ea270 Add sccp support for select instructions 
llvm-svn: 12318
 2004-03-12 05:52:44 +00:00
Chris Lattner
ca3b90f308 Since 'load null' is undefined, we can make it do whatever we want. Returning 
a zero value is the most likely way to cause further simplification, so we do it.

llvm-svn: 12197
 2004-03-07 22:16:24 +00:00
Chris Lattner
28131460da Adjustments to support the new ConstantAggregateZero class 
llvm-svn: 11474
 2004-02-15 05:55:15 +00:00
Chris Lattner
758109ce2e Don't use ConstantExpr::getShift anymore 
llvm-svn: 10791
 2004-01-12 19:08:43 +00:00
Chris Lattner
5a9246fb56 Use constantexprs for casts. Eliminate use of the ConstantHandling interfaces 
llvm-svn: 10779
 2004-01-12 17:43:40 +00:00
Chris Lattner
8e3cb82d12 Fix fairly severe bug in my last checking where we treated all unfoldable 
constants as being "true" when evaluating branches.  This was introduced
because we now create constantexprs for the constants instead of failing the
fold.

llvm-svn: 10778
 2004-01-12 17:40:36 +00:00
Chris Lattner
a523d45c39 * Implement minor performance optimization for the getelementptr case 
* Implement SCCP of load instructions, implementing Transforms/SCCP/loadtest.ll
  This allows us to fold expressions like "foo"[2], even if the pointer is only
  a conditional constant.

llvm-svn: 10767
 2004-01-12 04:29:41 +00:00
Chris Lattner
1269b71517 Implement SCCP/phitest.ll 
llvm-svn: 10763
 2004-01-12 03:57:30 +00:00
Chris Lattner
d33cc684b5 Finegrainify namespacification 
llvm-svn: 10725
 2004-01-09 06:02:20 +00:00
Brian Gaeke
d25f86d683 Put all LLVM code into the llvm namespace, as per bug 109. 
llvm-svn: 9903
 2003-11-11 22:41:34 +00:00
John Criswell
b402729b30 Added LLVM project notice to the top of every C++ source file. 
Header files will be on the way.

llvm-svn: 9298
 2003-10-20 19:43:21 +00:00
Chris Lattner
ae52a1b309 ADd support for the new varargs instructions 
llvm-svn: 9225
 2003-10-18 05:56:52 +00:00
Misha Brukman
868eac95dd Fix spelling. 
llvm-svn: 9027
 2003-10-10 17:57:28 +00:00
Chris Lattner
bf95cc12a3 Update comment 
llvm-svn: 8965
 2003-10-08 16:56:11 +00:00
Chris Lattner
9cece85acb Use a set to keep track of which edges have been noticed as executable already 
to avoid reprocessing PHI nodes needlessly.  This speeds up the big bad PHI
testcase 43%: from 104.9826 to 73.5157s

llvm-svn: 8964
 2003-10-08 16:55:34 +00:00
Chris Lattner
251ff679ce Minor fixes here and there 
llvm-svn: 8963
 2003-10-08 16:21:03 +00:00
Chris Lattner
36960b263b Avoid building data structures we don't really need. This improves the runtime 
of a test that Bill Wendling sent me from 228.5s to 105s.  Obviously there is
more improvement to be had, but this is a nice speedup which should be "felt"
by many programs.

llvm-svn: 8962
 2003-10-08 15:47:41 +00:00
Chris Lattner
4ad8720f91 Add support for the unwind instruction 
llvm-svn: 8408
 2003-09-08 18:54:55 +00:00
Chris Lattner
491ea39105 Fix bug: SCCP/2003-08-26-InvokeHandling.ll 
llvm-svn: 8152
 2003-08-27 01:08:35 +00:00
Misha Brukman
56f7db4178 Spell `necessary' correctly. 
llvm-svn: 7944
 2003-08-18 14:43:39 +00:00
Chris Lattner
686e94e760 DEBUG got moved to Support/Debug.h 
llvm-svn: 7492
 2003-08-01 22:15:03 +00:00
Chris Lattner
867b7661cb Fix bug: SCCP/2003-06-24-OverdefinedPHIValue.ll 
llvm-svn: 6883
 2003-06-24 20:29:52 +00:00
Misha Brukman
825e174bf7 Hopefully, the final fix for `[Pp]ropogate'. 
llvm-svn: 6251
 2003-05-20 21:01:22 +00:00
Chris Lattner
a7ee27e0fd Handle va_arg instruction correctly 
llvm-svn: 6030
 2003-05-08 02:50:13 +00:00