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11427 Commits

Author SHA1 Message Date
Owen Anderson
df1d2b02f9 Fix an issue where GVN was performing the return slot optimization when it was 
not safe.  This is fixed by more aggressively checking that the return slot is
not used elsewhere in the function.

llvm-svn: 47544
 2008-02-25 04:08:09 +00:00
Owen Anderson
40dca46ddb Fix an issue where GVN would try to use an instruction before its definition when performing return slot optimization. 
llvm-svn: 47541
 2008-02-25 00:40:41 +00:00
Zhou Sheng
aae582ba99 Testcase for Revision 47478. 
llvm-svn: 47531
 2008-02-23 10:59:51 +00:00
Nick Lewycky
fefd0202c9 Correctly fold divide-by-constant, even when faced with overflow. 
llvm-svn: 47287
 2008-02-18 22:48:05 +00:00
Chris Lattner
23fe6630e3 make this just a bit more strict. 
llvm-svn: 47274
 2008-02-18 17:33:10 +00:00
Owen Anderson
3549553262 Add support to GVN for performing sret return slot optimization. This means that, if an sret function tail calls 
another sret function, it should pass its own sret parameter to the tail callee, allowing it to fill in the correct
return value.  llvm-gcc does not emit this by default.  Instead, it allocates space in the caller for the sret of
the tail call and then uses memcpy to copy the result into the caller's sret parameter.  This optimization detects
and optimizes that case.

llvm-svn: 47265
 2008-02-18 09:24:53 +00:00
Chris Lattner
024f8c8f09 optimize away stackrestore calls that have no intervening alloca or call. 
llvm-svn: 47258
 2008-02-18 06:12:38 +00:00
Chris Lattner
c8ec470b52 upgrade this test. 
llvm-svn: 47257
 2008-02-18 06:11:00 +00:00
Chris Lattner
cc22601bc3 Fold (-x + -y) -> -(x+y) which promotes better association, fixing 
the second half of PR2047

llvm-svn: 47244
 2008-02-17 21:03:36 +00:00
Chris Lattner
a70d138457 Split up subtracts into add+negate if they have a reassociable use or operand 
that is also a subtract.  This implements PR2047 and Transforms/Reassociate/subtest2.ll 

llvm-svn: 47241
 2008-02-17 20:51:26 +00:00
Chris Lattner
2de8c2d41f upgrade and simplify this test. 
llvm-svn: 47240
 2008-02-17 20:48:43 +00:00
Duncan Sands
573b3f89e4 Remove any 'nest' parameter attributes if the function 
is not passed as an argument to a trampoline intrinsic.

llvm-svn: 47220
 2008-02-16 20:56:04 +00:00
Devang Patel
2e622e4c2b If loop header is also loop exiting block then OrigPN is incoming value for B loop header. 
Fixes PR 2030.

llvm-svn: 47141
 2008-02-14 23:18:47 +00:00
Chris Lattner
70e294660a Fix PR2029 
llvm-svn: 47129
 2008-02-14 19:18:13 +00:00
Nick Lewycky
9592bb0390 Testcase for PR2032. 
llvm-svn: 47113
 2008-02-14 07:15:11 +00:00
Devang Patel
0ecb76d820 A loop latch phi node may have uses inside loop, not just in loop header. 
llvm-svn: 47093
 2008-02-13 22:23:07 +00:00
Devang Patel
22c3caab6e While moving exit condition, do not drop loop latch on the floor. 
llvm-svn: 47089
 2008-02-13 22:06:36 +00:00
Devang Patel
c281d8031b Keep track of exit value operand number when operands are swapped. 
llvm-svn: 47082
 2008-02-13 19:48:48 +00:00
Eli Friedman
460648abde Add a note pointing to PR1996. 
llvm-svn: 47055
 2008-02-13 07:56:04 +00:00
Eli Friedman
03ec63f29d Add test for PR1996. (This is my first time adding a test for a 
transform, so please review.)

llvm-svn: 47050
 2008-02-13 06:55:57 +00:00
Owen Anderson
00dba4f734 Re-apply the patch to improve the optimizations of memcpy's, with several 
bugs fixed.  This now passes PPC bootstrap.

llvm-svn: 47026
 2008-02-12 21:15:18 +00:00
Devang Patel
26f75e2576 Fix PR 1995. 
llvm-svn: 46898
 2008-02-08 22:49:13 +00:00
Bill Wendling
c676a0329c Temporarily reverting: 
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20080128/057882.html

This is causing a miscompilation on PPC G5 and just now seeing it on iMac x86-64.

llvm-svn: 46822
 2008-02-06 20:03:07 +00:00
Chris Lattner
682a7dc653 Fix a bug compiling PR1978 (perhaps not the only one though) which 
was incorrectly simplifying "x == (gep x, 1, i)" into false, even 
though i could be negative.  As it turns out, all the code to 
handle this already existed, we just need to disable the incorrect
optimization case and let the general case handle it.

llvm-svn: 46739
 2008-02-05 04:45:32 +00:00
Owen Anderson
1a78ae76e4 Make this test more aggressive, to cover recent improvements. 
llvm-svn: 46695
 2008-02-04 04:55:24 +00:00
Owen Anderson
c4a7c41869 Allow GVN to hack on memcpy's, making them open to further optimization. 
llvm-svn: 46693
 2008-02-04 02:59:58 +00:00
Nick Lewycky
56178bc6ad Tag this test with the PR reference. 
llvm-svn: 46688
 2008-02-03 16:35:19 +00:00
Nick Lewycky
3b59214320 There are some cases where icmp(add) can be folded into a new icmp. Handle them. 
llvm-svn: 46687
 2008-02-03 16:33:09 +00:00
Duncan Sands
9aa789fda3 Don't drop function/call return attributes like 'nounwind'. 
llvm-svn: 46645
 2008-02-01 20:37:16 +00:00
Owen Anderson
4e4b116750 Make DSE much more aggressive by performing DCE earlier. Update a testcase to reflect this increased aggressiveness. 
llvm-svn: 46542
 2008-01-30 01:24:47 +00:00
Chris Lattner
b9e5b8fb9e Fix a bug where scalarrepl would discard offset if type would match. 
In practice this can only happen on code with already undefined behavior, 
but this is still a good thing to handle correctly.

llvm-svn: 46539
 2008-01-30 00:39:15 +00:00
Chris Lattner
ade0abb498 Don't let globalopt hack on volatile loads or stores. 
llvm-svn: 46523
 2008-01-29 19:01:37 +00:00
Chris Lattner
17819d971e eliminate additions of 0.0 when they are obviously dead. This has to be careful to 
avoid turning -0.0 + 0.0 -> -0.0 which is incorrect.

llvm-svn: 46499
 2008-01-29 06:52:45 +00:00
Owen Anderson
95bf1d4d7b Add a testcase for eliminating memcpy's at the end of functions. Forgot to commit this with my last commit. 
llvm-svn: 46497
 2008-01-29 06:40:32 +00:00
Devang Patel
67fa0521b6 Filter loops that subtract induction variables. 
These loops are not yet handled.

Fix PR 1912.

llvm-svn: 46484
 2008-01-29 02:20:41 +00:00
Chris Lattner
a116071547 this test is now compiled into the right thing. 
llvm-svn: 46454
 2008-01-28 17:38:46 +00:00
Nick Lewycky
8ea81e8ba4 Handle some more combinations of extend and icmp. Fixes PR1940. 
llvm-svn: 46431
 2008-01-28 03:48:02 +00:00
Chris Lattner
710b441174 Fix PR1932 by disabling an xform invalid for fdiv. 
llvm-svn: 46429
 2008-01-28 00:58:18 +00:00
Chris Lattner
1b706dd680 Fix PR1938 by forcing the code that uses an undefined value to branch one 
way or the other.  Rewriting the code itself prevents subsequent analysis
passes from making contradictory conclusions about the code that could 
cause an infeasible path to be made feasible.

llvm-svn: 46427
 2008-01-28 00:32:30 +00:00
Nick Lewycky
efb16f7057 Be more careful modifying the use_list while also iterating through it. 
llvm-svn: 46417
 2008-01-27 18:35:00 +00:00
Duncan Sands
053c9871cd Revert r46393: readonly/readnone functions are no 
longer allowed to write through byval arguments.

llvm-svn: 46416
 2008-01-27 18:12:58 +00:00
Bill Wendling
8c491162d2 The CorrelatedExpressions pass is now no more. 
llvm-svn: 46409
 2008-01-27 06:13:32 +00:00
Chris Lattner
fa1e7eef30 Fold fptrunc(add (fpextend x), (fpextend y)) -> add(x,y), as GCC does. 
llvm-svn: 46406
 2008-01-27 05:29:54 +00:00
Duncan Sands
dc157a4f0a Invert this test, because it is wrong if we allow 
readonly functions to use byval parameters as local
storage (how much do we want this?).

llvm-svn: 46399
 2008-01-26 12:33:01 +00:00
Owen Anderson
6af19fd1e2 DeadStoreElimination can treat byval parameters as if there were alloca's for the purpose of removing end-of-function stores. 
llvm-svn: 46351
 2008-01-25 10:10:33 +00:00
Nick Lewycky
78712e5b59 Multiply can be evaluated in a different type, so long as the target type has 
a smaller bitwidth.

llvm-svn: 46244
 2008-01-22 05:08:48 +00:00
Evan Cheng
9a93dc9565 Test case for varargs parameter attribute issue I just fixed. 
llvm-svn: 46127
 2008-01-17 07:26:31 +00:00
Chris Lattner
5630c4f217 Fix arg promotion to propagate the correct attrs on the calls to 
promoted functions.  This is important for varargs calls in 
particular.  Thanks to duncan for providing a great testcase.

llvm-svn: 46108
 2008-01-17 01:17:03 +00:00
Devang Patel
b3696e4f14 Do not strip llvm.used values. 
llvm-svn: 46045
 2008-01-16 03:33:05 +00:00
Chris Lattner
f3e1155c41 add a test to ensure that argpromote of one argument doesn't 
break the byval attr on some other argument.

llvm-svn: 46025
 2008-01-15 22:38:12 +00:00