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59 Commits

Author SHA1 Message Date
Owen Anderson
6aa3d83630 Add an early implementation of a partial inlining pass. The idea behind this 
is that, for functions whose bodies are entirely guarded by an if-statement, it
can be profitable to pull the test out of the callee and into the caller.

This code has had some cursory testing, but still has a number of known issues
on the LLVM test suite.

llvm-svn: 73338
 2009-06-14 08:26:32 +00:00
Dan Gohman
c6899f6200 Add a liveness analysis pass for LLVM IR values. This computes 
the set of blocks in which values are used, the set in which
values are live-through, and the set in which values are
killed. For the live-through and killed sets, conservative
approximations are used.

llvm-svn: 67309
 2009-03-19 17:29:04 +00:00
Duncan Sands
3350448d05 Fix PR3415 (infinite loop in EscapeAnalysis) by 
deleting the escape analysis pass.

llvm-svn: 63197
 2009-01-28 11:33:59 +00:00
Duncan Sands
36db5853cb Rename AddReadAttrs to FunctionAttrs, and teach it how 
to work out (in a very simplistic way) which function
arguments (pointer arguments only) are only dereferenced
and so do not escape.  Mark such arguments 'nocapture'.

llvm-svn: 61525
 2008-12-31 16:14:43 +00:00
Torok Edwin
9562aa1742 Add -print-dbginfo pass that prints LLVM IR with comments inserted to show 
which source/line a certain BB/instruction comes from, original variable names,
and original (unmangled) C++ name of functions.

llvm-svn: 61085
 2008-12-16 09:09:19 +00:00
Devang Patel
233728e8c3 Add new helper pass that strips all symbol names except debugging information. 
This pass makes it easier to test wheter debugging info. influences optimization passes or not.

llvm-svn: 59552
 2008-11-18 21:34:39 +00:00
Devang Patel
0616706919 Undo previous check-in. 
llvm-svn: 59092
 2008-11-11 23:57:33 +00:00
Devang Patel
c9fdfd2f0b Add utility pass to remove dbg info. 
llvm-svn: 59068
 2008-11-11 19:33:39 +00:00
Dan Gohman
c162a200ad Add a new pass to simplify specific half_powr function calls. This is 
a specialized pass that it not likely to be generally useful.

llvm-svn: 58732
 2008-11-04 23:41:45 +00:00
Nick Lewycky
15a23d029c Add a new MergeFunctions pass. It finds identical functions and merges them. 
This triggers only 60 times in llvm-test (look at .llvm.bc, not .linked.rbc)
and so it probably wont be turned on by default. Also, may of those are likely
to go away when PR2973 is fixed.

llvm-svn: 58557
 2008-11-02 05:52:50 +00:00
Daniel Dunbar
919ce3c16a Privatize PrintModulePass and PrintFunctionPass and add 
createPrintModulePass and createPrintFunctionPass.
 - So clients who compile w/o RTTI can use them.

llvm-svn: 57933
 2008-10-21 23:33:38 +00:00
Owen Anderson
ec151a1875 Add EscapeAnalysis. 
llvm-svn: 57411
 2008-10-12 06:49:21 +00:00
Duncan Sands
b2b5ddfaf6 Remove the MarkModRef pass (use AddReadAttrs instead). 
Unfortunately this means removing one regression test
of GlobalsModRef because I couldn't work out how to
perform it without MarkModRef.

llvm-svn: 56342
 2008-09-19 08:23:44 +00:00
Duncan Sands
c2ff9ca568 Add a new pass AddReadAttrs which works out which functions 
can get the readnone/readonly attributes, and gives them it.
The plan is to remove markmodref (which did the same thing
by querying GlobalsModRef) and delete the analogous
functionality from GlobalsModRef.

llvm-svn: 56341
 2008-09-19 08:17:05 +00:00
Andrew Lenharth
4a69775c64 Initial version of a Partial Specialization IPO pass. It triggers a couple hundred times on 176.gcc. I don't know the performance impact yet, the heuristic is quite simple still. 
llvm-svn: 55734
 2008-09-03 21:00:28 +00:00
Devang Patel
d2fbb7aa32 Add missing decls. 
llvm-svn: 55719
 2008-09-03 20:24:05 +00:00
Duncan Sands
0338e9f60d Add a small pass that sets the readnone/readonly 
attributes on functions, based on the result of
alias analysis.  It's not hardwired to use
GlobalsModRef even though this is the only (AFAIK)
alias analysis that results in this pass actually
doing something.  Enable as follows:
  opt ... -globalsmodref-aa -markmodref ...
Advantages of this pass: (1) records the result
of globalsmodref in the bitcode, meaning it is
available for use by later passes (currently
the pass manager isn't smart enough to magically
make an advanced alias analysis available to all
later passes), which may expose more optimization
opportunities; (2) hopefully speeds up compilation
when code is optimized twice, for example when a
file is compiled to bitcode, then later LTO is done
on it: marking functions readonly/readnone when
producing the initial bitcode should speed up alias
analysis during LTO; (3) good for discovering that
globalsmodref doesn't work very well :)
Not currently turned on by default.

llvm-svn: 55604
 2008-09-01 11:40:11 +00:00
Chris Lattner
2f629c4b80 Add a new trivial -inst-namer pass which makes it possible to diff the 
before/after effects of a pass, crazy!

llvm-svn: 55230
 2008-08-23 06:07:02 +00:00
Owen Anderson
13498aa150 Remove GCSE, ValueNumbering, and LoadValueNumbering. These have been deprecated for almost a year; it's finally time for them to go away. 
llvm-svn: 54822
 2008-08-15 21:31:02 +00:00
Nick Lewycky
d63159dcd4 Add a value range analysis that lazily computes ranges using ScalarEvolutions. 
llvm-svn: 52885
 2008-06-30 00:04:21 +00:00
Owen Anderson
0e26c5897a Force postdom to be linked into opt and bugpoint, even though it is no longer used by any passes. 
llvm-svn: 51686
 2008-05-29 17:00:13 +00:00
Chris Lattner
3ee18d7c51 Add a new LibCallAliasAnalysis pass, which is parameterized 
by an instance of LibCallInfo to provide mod/ref info of
standard library functions.  This is powerful enough to
say that 'sqrt' is readonly except that it modifies errno,
or that "printf doesn't store to memory unless the %n
constraint is present" etc.

llvm-svn: 50827
 2008-05-07 19:53:05 +00:00
Owen Anderson
5b7928f3d2 Rename DeadLoopElimination to LoopDeletion, part 2. 
llvm-svn: 50437
 2008-04-29 20:06:54 +00:00
Owen Anderson
4cc52fd657 Add dead loop elimination, which removes dead loops for which we can compute 
the trip count.

llvm-svn: 50382
 2008-04-29 00:38:34 +00:00
Chris Lattner
c8c74f39db Add a new Jump Threading pass, which will handle cases 
such as those in PR2235.  Right now the pass is not very
effective. :)

llvm-svn: 50000
 2008-04-20 20:35:01 +00:00
Owen Anderson
ca7e0e21f3 Factor a bunch of functionality related to memcpy and memset transforms out of 
GVN and into its own pass.

llvm-svn: 49419
 2008-04-09 08:23:16 +00:00
Devang Patel
494c61fd20 Add new sretpromotion pass. 
llvm-svn: 48032
 2008-03-07 21:07:34 +00:00
Devang Patel
f7d8b7679b Add StripDeadPrototypes pass. 
llvm-svn: 47488
 2008-02-22 18:39:29 +00:00
Chris Lattner
ae2f8bc116 remove the LowerSelect pass. The last client was the old Sparc backend, which is long dead by now. 
llvm-svn: 47323
 2008-02-19 07:49:17 +00:00
Chris Lattner
010e9fb704 remove the lower packed pass. It can never work and even the parts that 
could work don't work fully.  This fixes PR1705.  Oh yeah, we don't have
packed types anymore either ;-)

llvm-svn: 47322
 2008-02-19 07:39:17 +00:00
Bill Wendling
629a569ce9 The CorrelatedExpressionElimination pass is known to be buggy. Remove it. 
This fixes PR1769.

llvm-svn: 46408
 2008-01-27 06:11:41 +00:00
Gordon Henriksen
db4f51e1b9 With this patch, the LowerGC transformation becomes the 
ShadowStackCollector, which additionally has reduced overhead with
no sacrifice in portability.

Considering a function @fun with 8 loop-local roots,
ShadowStackCollector introduces the following overhead
(x86):

; shadowstack prologue
        movl    L_llvm_gc_root_chain$non_lazy_ptr, %eax
        movl    (%eax), %ecx
        movl    $___gc_fun, 20(%esp)
        movl    $0, 24(%esp)
        movl    $0, 28(%esp)
        movl    $0, 32(%esp)
        movl    $0, 36(%esp)
        movl    $0, 40(%esp)
        movl    $0, 44(%esp)
        movl    $0, 48(%esp)
        movl    $0, 52(%esp)
        movl    %ecx, 16(%esp)
        leal    16(%esp), %ecx
        movl    %ecx, (%eax)

; shadowstack loop overhead
        (none)

; shadowstack epilogue
        movl    48(%esp), %edx
        movl    %edx, (%ecx)

; shadowstack metadata
        .align  3
___gc_fun:                              # __gc_fun
        .long   8
        .space  4

In comparison to LowerGC:

; lowergc prologue
        movl    L_llvm_gc_root_chain$non_lazy_ptr, %eax
        movl    (%eax), %ecx
        movl    %ecx, 48(%esp)
        movl    $8, 52(%esp)
        movl    $0, 60(%esp)
        movl    $0, 56(%esp)
        movl    $0, 68(%esp)
        movl    $0, 64(%esp)
        movl    $0, 76(%esp)
        movl    $0, 72(%esp)
        movl    $0, 84(%esp)
        movl    $0, 80(%esp)
        movl    $0, 92(%esp)
        movl    $0, 88(%esp)
        movl    $0, 100(%esp)
        movl    $0, 96(%esp)
        movl    $0, 108(%esp)
        movl    $0, 104(%esp)
        movl    $0, 116(%esp)
        movl    $0, 112(%esp)

; lowergc loop overhead
        leal    44(%esp), %eax
        movl    %eax, 56(%esp)
        leal    40(%esp), %eax
        movl    %eax, 64(%esp)
        leal    36(%esp), %eax
        movl    %eax, 72(%esp)
        leal    32(%esp), %eax
        movl    %eax, 80(%esp)
        leal    28(%esp), %eax
        movl    %eax, 88(%esp)
        leal    24(%esp), %eax
        movl    %eax, 96(%esp)
        leal    20(%esp), %eax
        movl    %eax, 104(%esp)
        leal    16(%esp), %eax
        movl    %eax, 112(%esp)

; lowergc epilogue
        movl    48(%esp), %edx
        movl    %edx, (%ecx)

; lowergc metadata
        (none)

llvm-svn: 45670
 2008-01-07 01:30:53 +00:00
Chris Lattner
6badc24aa5 fix an accidental commit that broke all the testers :( 
llvm-svn: 45659
 2008-01-06 19:18:52 +00:00
Chris Lattner
5489888580 rename isStore -> mayStore to more accurately reflect what it captures. 
llvm-svn: 45656
 2008-01-06 08:36:04 +00:00
Owen Anderson
4cce45354c Didn't mean to commit this. 
llvm-svn: 45606
 2008-01-05 00:42:45 +00:00
Owen Anderson
2adf8c5533 Move some more functionality from MRegisterInfo to TargetInstrInfo. 
llvm-svn: 45603
 2008-01-04 23:57:37 +00:00
Chris Lattner
e0b1ee937a Don't attribute in file headers anymore. See llvmdev for the 
discussion of this change.  Boy are my fingers tired. ;-)

llvm-svn: 45411
 2007-12-29 19:59:42 +00:00
Owen Anderson
a37895cfee Remove RLE from the headers, since the pass itself is gone now. 
llvm-svn: 41971
 2007-09-14 22:54:46 +00:00
Devang Patel
228dc09ff6 Begin loop index split pass. 
llvm-svn: 40883
 2007-08-07 00:25:56 +00:00
Owen Anderson
58e64df595 Rename FastDSE to just DSE. 
llvm-svn: 40668
 2007-08-01 06:36:51 +00:00
Owen Anderson
eb9f1b612c Add a GVN pass, using the value numbering code I developed for GVNPRE and the 
load elimination code from RedundantLoadElimination.

llvm-svn: 40469
 2007-07-24 17:55:58 +00:00
Owen Anderson
5969a3cb91 Rename a lot of things to change FastDLE to RedundantLoadElimination. 
llvm-svn: 40457
 2007-07-24 00:17:04 +00:00
Owen Anderson
8523f2d7c4 Forgot to commit this file. 
llvm-svn: 40447
 2007-07-23 22:00:03 +00:00
Owen Anderson
1eaba31f12 Add FastDSE, a new algorithm for doing dead store elimination. This algorithm is not as accurate 
as the current DSE, but it only a linear scan over each block, rather than quadratic.  Eventually
(once it has been improved somewhat), this will replace the current DSE.

NOTE: This has not yet been extensively tested.
llvm-svn: 38517
 2007-07-11 00:46:18 +00:00
Owen Anderson
d765ae21f7 Put GVN-PRE in all the right places. 
llvm-svn: 37352
 2007-05-29 23:36:32 +00:00
Owen Anderson
ea857029ea Remove ImmediateDominator analysis. The same information can be obtained from DomTree. A lot of code for 
constructing ImmediateDominator is now folded into DomTree construction.

This is part of the ongoing work for PR217.

llvm-svn: 36063
 2007-04-15 08:47:27 +00:00
Owen Anderson
85b0e20f2a Completely purge DomSet. This is the (hopefully) final patch for PR1171. 
llvm-svn: 35731
 2007-04-07 07:17:27 +00:00
Chris Lattner
b30cb05d63 add loop rot 
llvm-svn: 35722
 2007-04-07 04:43:02 +00:00
Chris Lattner
579b1c63d5 Split the sdisel code munging stuff out into its own opt-pass, CodeGenPrepare. 
llvm-svn: 35528
 2007-03-31 04:06:36 +00:00
Chris Lattner
71ced5505c remove some passes 
llvm-svn: 34437
 2007-02-20 05:31:04 +00:00