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1564 Commits

Author SHA1 Message Date
Nick Lewycky
e0cfecf47d Correctly fold divide-by-constant, even when faced with overflow. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47287 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 22:48:05 +00:00
Chris Lattner
ea0415957d make this just a bit more strict. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47274 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 17:33:10 +00:00
Owen Anderson
5aa4f2a085 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47265 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 09:24:53 +00:00
Chris Lattner
bf1d8a7099 optimize away stackrestore calls that have no intervening alloca or call. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47258 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 06:12:38 +00:00
Chris Lattner
28cb2051c8 upgrade this test. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47257 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-18 06:11:00 +00:00
Chris Lattner
dd12f96c5e Fold (-x + -y) -> -(x+y) which promotes better association, fixing 
the second half of PR2047


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47244 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-17 21:03:36 +00:00
Chris Lattner
0b0803ae15 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 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47241 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-17 20:51:26 +00:00
Chris Lattner
f06c3c29ac upgrade and simplify this test. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47240 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-17 20:48:43 +00:00
Duncan Sands
3d5378ff8e Remove any 'nest' parameter attributes if the function 
is not passed as an argument to a trampoline intrinsic.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47220 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-16 20:56:04 +00:00
Devang Patel
9b03daa2a3 If loop header is also loop exiting block then OrigPN is incoming value for B loop header. 
Fixes PR 2030.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47141 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-14 23:18:47 +00:00
Chris Lattner
8c5c22f610 Fix PR2029 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47129 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-14 19:18:13 +00:00
Nick Lewycky
c91b49b890 Testcase for PR2032. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47113 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-14 07:15:11 +00:00
Devang Patel
ea06906559 A loop latch phi node may have uses inside loop, not just in loop header. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47093 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-13 22:23:07 +00:00
Devang Patel
23067dfeac While moving exit condition, do not drop loop latch on the floor. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47089 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-13 22:06:36 +00:00
Devang Patel
02c4836f3d Keep track of exit value operand number when operands are swapped. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47082 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-13 19:48:48 +00:00
Eli Friedman
35327b3e57 Add a note pointing to PR1996. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47055 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-13 07:56:04 +00:00
Eli Friedman
261c704da1 Add test for PR1996. (This is my first time adding a test for a 
transform, so please review.)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47050 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-13 06:55:57 +00:00
Owen Anderson
30b4bd4d10 Re-apply the patch to improve the optimizations of memcpy's, with several 
bugs fixed.  This now passes PPC bootstrap.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47026 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-12 21:15:18 +00:00
Devang Patel
82ada54da0 Fix PR 1995. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46898 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-08 22:49:13 +00:00
Bill Wendling
e00fec554b 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46822 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-06 20:03:07 +00:00
Chris Lattner
7c95debb49 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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46739 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-05 04:45:32 +00:00
Owen Anderson
d02c0bc984 Make this test more aggressive, to cover recent improvements. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46695 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-04 04:55:24 +00:00
Owen Anderson
6f7a52d300 Allow GVN to hack on memcpy's, making them open to further optimization. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46693 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-04 02:59:58 +00:00
Nick Lewycky
f2a5f012f3 Tag this test with the PR reference. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46688 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-03 16:35:19 +00:00
Nick Lewycky
5be2920149 There are some cases where icmp(add) can be folded into a new icmp. Handle them. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46687 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-03 16:33:09 +00:00
Duncan Sands
532d022794 Don't drop function/call return attributes like 'nounwind'. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46645 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-01 20:37:16 +00:00
Owen Anderson
772601a885 Make DSE much more aggressive by performing DCE earlier. Update a testcase to reflect this increased aggressiveness. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46542 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-30 01:24:47 +00:00
Chris Lattner
b10e0da065 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46539 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-30 00:39:15 +00:00
Chris Lattner
c69d3c9442 Don't let globalopt hack on volatile loads or stores. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46523 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-29 19:01:37 +00:00
Chris Lattner
2454a2e0c3 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46499 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-29 06:52:45 +00:00
Owen Anderson
cca1867ab7 Add a testcase for eliminating memcpy's at the end of functions. Forgot to commit this with my last commit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46497 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-29 06:40:32 +00:00
Devang Patel
c840da14c6 Filter loops that subtract induction variables. 
These loops are not yet handled.

Fix PR 1912.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46484 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-29 02:20:41 +00:00
Chris Lattner
349c72a35d this test is now compiled into the right thing. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46454 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-28 17:38:46 +00:00
Nick Lewycky
4189a538e4 Handle some more combinations of extend and icmp. Fixes PR1940. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46431 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-28 03:48:02 +00:00
Chris Lattner
25feae555d Fix PR1932 by disabling an xform invalid for fdiv. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46429 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-28 00:58:18 +00:00
Chris Lattner
05bb789430 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46427 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-28 00:32:30 +00:00
Nick Lewycky
c837abee2f Be more careful modifying the use_list while also iterating through it. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46417 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-27 18:35:00 +00:00
Duncan Sands
d82375c1c4 Revert r46393: readonly/readnone functions are no 
longer allowed to write through byval arguments.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46416 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-27 18:12:58 +00:00
Bill Wendling
67fed1c8f2 The CorrelatedExpressions pass is now no more. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46409 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-27 06:13:32 +00:00
Chris Lattner
b753065f6d Fold fptrunc(add (fpextend x), (fpextend y)) -> add(x,y), as GCC does. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46406 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-27 05:29:54 +00:00
Duncan Sands
63b2c2dde7 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?).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46399 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-26 12:33:01 +00:00
Owen Anderson
e3c36f6758 DeadStoreElimination can treat byval parameters as if there were alloca's for the purpose of removing end-of-function stores. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46351 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-25 10:10:33 +00:00
Nick Lewycky
e6b0c0036a Multiply can be evaluated in a different type, so long as the target type has 
a smaller bitwidth.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46244 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-22 05:08:48 +00:00
Evan Cheng
e6d5c77d5d Test case for varargs parameter attribute issue I just fixed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46127 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-17 07:26:31 +00:00
Chris Lattner
ab04e13a1f 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46108 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-17 01:17:03 +00:00
Devang Patel
8c231e5dda Do not strip llvm.used values. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46045 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-16 03:33:05 +00:00
Chris Lattner
beb168992f add a test to ensure that argpromote of one argument doesn't 
break the byval attr on some other argument.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46025 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-15 22:38:12 +00:00
Duncan Sands
b0c9b93bb4 I noticed that the trampoline straightening transformation could 
drop attributes on varargs call arguments.  Also, it could generate
invalid IR if the transformed call already had the 'nest' attribute
somewhere (this can never happen for code coming from llvm-gcc,
but it's a theoretical possibility).  Fix both problems.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45973 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-14 19:52:09 +00:00
Chris Lattner
941db495b8 Fix the miscompilation of MiBench/consumer-lame that was exposed by Evan's 
byval work.  This miscompilation is due to the program indexing an array out
of range and us doing a transformation that broke this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45949 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-14 02:09:12 +00:00
Chris Lattner
37ac608623 Turn a memcpy from a double* into a load/store of double instead of 
a load/store of i64.  The later prevents promotion/scalarrepl of the
source and dest in many cases.

This fixes the 300% performance regression of the byval stuff on 
stepanov_v1p2.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45945 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-14 00:28:35 +00:00