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2564 Commits

Author SHA1 Message Date
Andrew Trick
8de329a9fc LSR should avoid redundant edge splitting. 
This handles the case in which LSR rewrites an IV user that is a phi and
splits critical edges originating from a switch.
Fixes <rdar://problem/6453893> LSR is not splitting edges "nicely"

llvm-svn: 141059
 2011-10-04 03:50:44 +00:00
Andrew Trick
bf51f97c28 Unit test for r140919, loop unroll heuristics. 
llvm-svn: 141049
 2011-10-04 00:07:02 +00:00
Rafael Espindola
cc349c8dd8 Add the returns_twice attribute to LLVM. 
llvm-svn: 141001
 2011-10-03 14:45:37 +00:00
Nick Lewycky
99fb091f65 Add a new icmp+select optz'n. Also shows off the load(cst) folding added in 
r140966.

llvm-svn: 140969
 2011-10-02 10:37:37 +00:00
Jim Grosbach
24ff834671 float comparison to double 'zero' constant can just be a float 'zero.' 
InstCombine was incorrectly considering the conversion of the constant
zero to be unsafe.

We want to transform:
define float @bar(float %x) nounwind readnone optsize ssp {
  %conv = fpext float %x to double
  %cmp = fcmp olt double %conv, 0.000000e+00
  %conv1 = zext i1 %cmp to i32
  %conv2 = sitofp i32 %conv1 to float
  ret float %conv2
}

Into:
define float @bar(float %x) nounwind readnone optsize ssp {
  %cmp = fcmp olt float %x, 0.000000e+00   ; <---- This
  %conv1 = zext i1 %cmp to i32
  %conv2 = sitofp i32 %conv1 to float
  ret float %conv2
}


rdar://10215914

llvm-svn: 140869
 2011-09-30 18:45:50 +00:00
Duncan Sands
d6c0011d92 Add forgotten tests that the cleanup flag is cleared if there 
is a catch-all landingpad clause.

llvm-svn: 140858
 2011-09-30 17:00:34 +00:00
Duncan Sands
5c05579f94 Inlining often produces landingpad instructions with repeated 
catch or repeated filter clauses.  Teach instcombine a bunch
of tricks for simplifying landingpad clauses.  Currently the
code only recognizes the GNU C++ and Ada personality functions,
but that doesn't stop it doing a bunch of "generic" transforms
which are hopefully fine for any real-world personality function.
If these "generic" transforms turn out not to be generic, they
can always be conditioned on the personality function.  Probably
someone should add the ObjC++ personality function.  I didn't as
I don't know anything about it.

llvm-svn: 140852
 2011-09-30 13:12:16 +00:00
Dan Gohman
4ac148dcbc When eliminating unnecessary retain+autorelease on return values, 
handle the case where the retain is in a different basic block.
rdar://10210274.

llvm-svn: 140815
 2011-09-29 22:27:34 +00:00
Dan Gohman
2053a5dd64 Don't eliminate objc_retainBlock calls on stack objects if the 
objc_retainBlock call is potentially responsible for copying
the block to the heap to extend its lifetime. rdar://10209613.

llvm-svn: 140814
 2011-09-29 22:25:23 +00:00
Andrew Trick
8c219ecd1a Test case for r140670: indvars should hoist sext. 
llvm-svn: 140671
 2011-09-28 02:13:32 +00:00
Benjamin Kramer
547b6c5ecd Stop emitting instructions with the name "tmp" they eat up memory and have to be uniqued, without any benefit. 
If someone prefers %tmp42 to %42, run instnamer.

llvm-svn: 140634
 2011-09-27 20:39:19 +00:00
Bill Wendling
90f90da156 Split the landing pad basic block with the correct function. Also merge the 
split landingpad instructions into a PHI node.
PR11016

llvm-svn: 140592
 2011-09-27 00:59:31 +00:00
Eli Friedman
c064f2c33e Convert more tests over to the new atomic instructions. 
llvm-svn: 140559
 2011-09-26 20:27:49 +00:00
Eli Friedman
bda9e7af58 Upgrade a couple more tests to the new atomic instructions. 
llvm-svn: 140558
 2011-09-26 20:15:56 +00:00
Eli Friedman
f9b785f185 PR10987: add a missed safety check to isSafePHIToSpeculate in scalarrepl. 
llvm-svn: 140327
 2011-09-22 18:56:30 +00:00
Eli Friedman
1815b688cc Make sure IPSCCP never marks a tracked call as overdefined in SCCPSolver::ResolvedUndefsIn. If we do, we can end up in a situation where a function is resolved to return a constant, but the caller is marked overdefined, which confuses the code later. 
<rdar://problem/9956541> (again).

llvm-svn: 140210
 2011-09-20 23:28:51 +00:00
Bill Wendling
cf1372d183 Update this test to the new EH model. 
Though I think it may be obsolete with the loop extract changes. And I couldn't
get the old version of LLVM to compile so that I could reduce this testcase.

llvm-svn: 140197
 2011-09-20 22:29:43 +00:00
Bill Wendling
626a6f4160 Update to new EH model. 
llvm-svn: 140177
 2011-09-20 20:21:16 +00:00
Bill Wendling
708d38e06a Update to the new EH syntax. 
llvm-svn: 140103
 2011-09-19 23:50:34 +00:00
Bill Wendling
ff5d9cc389 Dramatically reduce this testcase. 
llvm-svn: 140101
 2011-09-19 23:47:06 +00:00
Bill Wendling
7cdaa3a1a8 Revert r140083 and r140084 until buildbots can be fixed. 
llvm-svn: 140094
 2011-09-19 23:30:41 +00:00
Bill Wendling
d01aee587f Update test to remove the 'unwind' instruction. 
llvm-svn: 140084
 2011-09-19 23:01:11 +00:00
Bill Wendling
8bf0eab34d Replace uses of unwind with unreachable for the same effect. 
llvm-svn: 140077
 2011-09-19 22:16:15 +00:00
Bill Wendling
e7b02b8170 Replace more uses of 'unwind' in the tests with calls to landingpad and 
resume. Note that some of these tests were basically dead.

llvm-svn: 140076
 2011-09-19 22:11:35 +00:00
Eli Friedman
61d7c8a065 Fix an infinite loop where a transform in InstCombiner::visitAnd claims a construct is changed when it is not. (See included testcase.) 
Patch by Xiaoyi Guo.

llvm-svn: 140072
 2011-09-19 21:58:15 +00:00
Bill Wendling
c945f54ea5 This testcase is dead. It doesn't inline even if I add the 'alwaysinline' 
attribute to the @foo function.

llvm-svn: 140067
 2011-09-19 21:14:33 +00:00
Andrew Trick
7251e41b16 [indvars] Fix PR10946: SCEV cannot handle Vector IVs. 
llvm-svn: 140026
 2011-09-19 17:54:39 +00:00
Andrew Trick
74111ee07f Reapply r139759. Disable IV rewriting by default. See PR10916. 
llvm-svn: 139842
 2011-09-15 20:58:37 +00:00
Eli Friedman
888bea0b95 Make demanded-elt simplification for shufflevector slightly stronger. Spotted by inspection. 
llvm-svn: 139768
 2011-09-15 01:14:29 +00:00
Dan Gohman
d4b5e3a4d9 objc_retainBlock is not NoModRef because it can update forwarding pointers 
in memory relevant to the optimizer. rdar://10050579.

llvm-svn: 139708
 2011-09-14 18:13:00 +00:00
Andrew Trick
f9f68b816b [indvars] Revert r139579 until 401.bzip -arch i386 miscompilation is fixed. PR10920. 
llvm-svn: 139583
 2011-09-13 05:23:49 +00:00
Andrew Trick
061d811c51 Disable IV rewriting by default. See PR10916. 
llvm-svn: 139579
 2011-09-13 03:23:21 +00:00
Andrew Trick
5b28cc84f0 Generalize test case to handle multiple indvars modes. 
llvm-svn: 139578
 2011-09-13 03:17:25 +00:00
Andrew Trick
3de5b8e4c1 [indvars] Fix bugs in floating point IV range checks noticed by inspection. 
llvm-svn: 139574
 2011-09-13 01:59:32 +00:00
Andrew Trick
54a109845d Conditionalize indvars test that relies on SCEV expansion of geps, 
which is only relevant with canonical IVs

llvm-svn: 139556
 2011-09-12 23:13:57 +00:00
Andrew Trick
a8315c3f2b indvars test only relevant for -enable-iv-rewrite. 
Otherwise this case is now covered by no-iv-rewrite.ll.

llvm-svn: 139552
 2011-09-12 22:59:00 +00:00
Andrew Trick
d2e61e1f70 Conditionalize indvars tests that rely on SCEV expansion of geps, 
which is relevant with canonical IVs. Anything else being checked by
these tests is already covered by early CSE.

llvm-svn: 139535
 2011-09-12 20:26:34 +00:00
Andrew Trick
30e8db98b8 Removing indvars tests that directly test canonical IVs and nothing else. 
llvm-svn: 139518
 2011-09-12 18:33:08 +00:00
Andrew Trick
183013d8d4 Rename -disable-iv-rewrite to -enable-iv-rewrite=false in preparation for default change. 
llvm-svn: 139517
 2011-09-12 18:28:44 +00:00
Andrew Trick
8c6fb3af6e Test case for r139453, WidenIV::GetExtendedOperandRecurrence. 
llvm-svn: 139504
 2011-09-12 17:20:57 +00:00
Duncan Sands
ba60b04148 Mark the eh.typeid.for intrinsic as being 'const', which it is inside 
any given function.  As pointed out by John McCall, this is needed to
have redundant eh.typeid.for tests be eliminated in the presence of
cleanups.

llvm-svn: 139360
 2011-09-09 07:50:37 +00:00
Duncan Sands
524c33a27f When inlining exception handling code into another function, ensure that 
duplicate tests are eliminated (for example if the two functions both have
a catch clause catching the same type, ensure the redundant one is removed).
Note that it would probably be safe to say that eh.typeid.for is 'const',
but since two calls to it with the same argument can give different results
(but only if the calls are in different functions), it seems more correct to
mark it only 'pure'; this doesn't get in the way of the optimization.

llvm-svn: 139236
 2011-09-07 16:44:14 +00:00
Duncan Sands
d7430cea10 Forgot to add this trampoline testcase. 
llvm-svn: 139229
 2011-09-07 09:21:38 +00:00
Owen Anderson
58704ee442 Try again at r138809 (make DSE more aggressive in removing dead stores at the end of a function), now with less deleting stores before memcpy's. 
llvm-svn: 139150
 2011-09-06 18:14:09 +00:00
Duncan Sands
a098436b32 Split the init.trampoline intrinsic, which currently combines GCC's 
init.trampoline and adjust.trampoline intrinsics, into two intrinsics
like in GCC.  While having one combined intrinsic is tempting, it is
not natural because typically the trampoline initialization needs to
be done in one function, and the result of adjust trampoline is needed
in a different (nested) function.  To get around this llvm-gcc hacks the
nested function lowering code to insert an additional parent variable
holding the adjust.trampoline result that can be accessed from the child
function.  Dragonegg doesn't have the luxury of tweaking GCC code, so it
stored the result of adjust.trampoline in the memory GCC set aside for
the trampoline itself (this is always available in the child function),
and set up some new memory (using an alloca) to hold the trampoline.
Unfortunately this breaks Go which allocates trampoline memory on the
heap and wants to use it even after the parent has exited (!).  Rather
than doing even more hacks to get Go working, it seemed best to just use
two intrinsics like in GCC.  Patch mostly by Sanjoy Das.

llvm-svn: 139140
 2011-09-06 13:37:06 +00:00
Benjamin Kramer
4b79c21ef2 InstSimplify: Don't try to replace an extractvalue/insertvalue pair with the original value if types don't match. 
Fixes clang selfhost.

llvm-svn: 139120
 2011-09-05 18:16:19 +00:00
Duncan Sands
29192d042e Delete trivial landing pads that just continue unwinding the caught 
exception.

llvm-svn: 139117
 2011-09-05 12:57:57 +00:00
Duncan Sands
fd26a954a8 Add some simple insertvalue simplifications, for the purpose of cleaning 
up do-nothing exception handling code produced by dragonegg.

llvm-svn: 139113
 2011-09-05 06:52:48 +00:00
Bill Wendling
4aa2573748 Try to eliminate the use of the 'unwind' instruction. 
llvm-svn: 139046
 2011-09-02 22:41:11 +00:00
Andrew Trick
310a448cfe Test case update for unroll-scev. 
llvm-svn: 139037
 2011-09-02 21:21:03 +00:00