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7811 Commits

Author SHA1 Message Date
Bill Wendling
31d244ead5 * The DSE code that tested for overlapping needed to take into account the fact 
that one of the numbers is signed while the other is unsigned. This could lead
  to a wrong result when the signed was promoted to an unsigned int.

* Add the data layout line to the testcase so that it will test the appropriate
  thing.

Patch by David Terei!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128577 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-30 21:37:19 +00:00
Benjamin Kramer
546739656e InstCombine: If the divisor of an fdiv has an exact inverse, turn it into an fmul. 
Fixes PR9587.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128546 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-30 15:42:35 +00:00
Jay Foad
3ecfc861b4 Remove PHINode::reserveOperandSpace(). Instead, add a parameter to 
PHINode::Create() giving the (known or expected) number of operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128537 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-30 11:28:46 +00:00
Jay Foad
d8b4fb4aab (Almost) always call reserveOperandSpace() on newly created PHINodes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128535 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-30 11:19:20 +00:00
Benjamin Kramer
9822b869fc InstCombine: Add a few missing combines for ANDs and ORs of sign bit tests. 
On x86 we now compile "if (a < 0 && b < 0)" into
	testl	%edi, %esi
	js	IF.THEN

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128496 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-29 22:06:41 +00:00
Benjamin Kramer
ec3f227820 DSE: Remove an early exit optimization that depended on the ordering of a SmallPtrSet. 
Fixes PR9569 and will hopefully make selfhost on ASLR-enabled systems more deterministic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128482 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-29 20:28:57 +00:00
Cameron Zwarich
9827b78b51 Do some simple copy propagation through integer loads and stores when promoting 
vector types. This helps a lot with inlined functions when using the ARM soft
float ABI. Fixes <rdar://problem/9184212>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128453 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-29 05:19:52 +00:00
Nick Lewycky
2bf026e375 Remove tabs I accidentally added. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128413 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-28 17:48:26 +00:00
Jay Foad
fd4a5497b6 Make more use of PHINode::getNumIncomingValues(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128406 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-28 13:03:10 +00:00
Frits van Bommel
f56762a96d Add some debug output when -instcombine uses RAUW. This can make debug output for those cases much clearer since without this it only showed that the original instruction was removed, not what it was replaced with. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128399 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-27 23:32:31 +00:00
Nick Lewycky
675619ca38 Teach the transformation that moves binary operators around selects to preserve 
the subclass optional data.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128388 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-27 19:51:23 +00:00
Benjamin Kramer
d655e6e9dc Use APInt's umul_ov instead of rolling our own overflow detection. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128380 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-27 15:04:38 +00:00
Nick Lewycky
98cd75027c Add a small missed optimization: turn X == C ? X : Y into X == C ? C : Y. This 
removes one use of X which helps it pass the many hasOneUse() checks.

In my analysis, this turns up very often where X = A >>exact B and that can't be
simplified unless X has one use (except by increasing the lifetime of A which is
generally a performance loss).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128373 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-27 07:30:57 +00:00
Bill Wendling
1a4d58af09 Simplification noticed by Frits. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128333 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-26 09:32:07 +00:00
Bill Wendling
150c4a1a89 Rework the logic that determines if a store completely overlaps an ealier store. 
There are two ways that a later store can comletely overlap a previous store:

1. They both start at the same offset, but the earlier store's size is <= the
   later's size, or
2. The earlier store's offset is > the later's offset, but it's offset + size
   doesn't extend past the later's offset + size.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128332 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-26 08:02:59 +00:00
Cameron Zwarich
c77a10fe0a Fix a typo and add a test. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128331 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-26 04:58:50 +00:00
Bill Wendling
e420449e80 PR9561: A store with a negative offset (via GEP) could erroniously say that it 
completely overlaps a previous store, thus mistakenly deleting that store. Check
for this condition.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128319 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-26 01:20:37 +00:00
Nick Lewycky
628b337561 No functionality change, just adjust some whitespace for coding style compliance. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128257 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-25 06:05:50 +00:00
Cameron Zwarich
9035484200 Debug intrinsics must be skipped at the beginning and ends of blocks, lest they 
affect the generated code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128217 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-24 16:34:59 +00:00
Cameron Zwarich
dc31cfeb74 It is enough for the CallInst to have no uses to be made a tail call with a ret 
void; it doesn't need to have a void type.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128212 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-24 15:54:11 +00:00
Devang Patel
52e37df8c0 s/UpdateDT/ModifiedDT/g 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128211 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-24 15:35:25 +00:00
Cameron Zwarich
6e8ffc1c4d Do early taildup of ret in CodeGenPrepare for potential tail calls that have a 
void return type. This fixes PR9487.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128197 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-24 04:52:10 +00:00
Cameron Zwarich
4bae588c75 Use an early return instead of a long if block. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128196 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-24 04:52:07 +00:00
Cameron Zwarich
680c962ebd When UpdateDT is set, DT is invalid, which could cause problems when trying to 
use it later. I couldn't make a test that hits this with the current code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128195 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-24 04:52:04 +00:00
Cameron Zwarich
661a390b83 Check for TLI so that -codegenprepare can be used from opt. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128194 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-24 04:51:51 +00:00
Cameron Zwarich
1537ce75ed Fix PR9464 by correcting some math that just happened to be right in most cases 
that were hit in practice.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128146 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-23 05:25:55 +00:00
Anders Carlsson
807bc2a381 Handle another case that Frits suggested. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128068 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-22 03:21:01 +00:00
Devang Patel
b99462117e Simplify. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128030 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-21 22:04:45 +00:00
Anders Carlsson
b12caf31f4 More cleanups to the OptimizeEmptyGlobalCXXDtors GlobalOpt function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127997 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-21 14:54:40 +00:00
Anders Carlsson
262a862787 As suggested by Nick Lewycky, ignore debugging intrinsics when trying to decide whether a destructor is empty or not. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127985 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-21 02:42:27 +00:00
Nick Lewycky
35ee1c921c Fix comments 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127984 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-21 02:26:01 +00:00
Evan Cheng
485fafc840 Re-apply r127953 with fixes: eliminate empty return block if it has no predecessors; update dominator tree if cfg is modified. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127981 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-21 01:19:09 +00:00
Anders Carlsson
4f735ca185 Don't try to eliminate invokes to __cxa_atexit. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127976 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-20 20:21:33 +00:00
Anders Carlsson
372ec6aa91 Don't segfault on mutual recursion, as pointed out by Frits. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127975 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-20 20:16:43 +00:00
Anders Carlsson
1f7c7ba380 Address comments from Frits van Bommel. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127974 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-20 19:51:13 +00:00
Anders Carlsson
a201c4c2e6 Add an optimization to GlobalOpt that eliminates calls to __cxa_atexit, if the function passed is empty. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127970 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-20 17:59:11 +00:00
Daniel Dunbar
7a90e04fc7 Revert r127953, "SimplifyCFG has stopped duplicating returns into predecessors 
to canonicalize IR", it broke a lot of things.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127954 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-19 21:47:14 +00:00
Evan Cheng
ae16d6b972 SimplifyCFG has stopped duplicating returns into predecessors to canonicalize IR 
to have single return block (at least getting there) for optimizations. This
is general goodness but it would prevent some tailcall optimizations.
One specific case is code like this:
int f1(void);
int f2(void);
int f3(void);
int f4(void);
int f5(void);
int f6(void);
int foo(int x) {
  switch(x) {
  case 1: return f1();
  case 2: return f2();
  case 3: return f3();
  case 4: return f4();
  case 5: return f5();
  case 6: return f6();
  }
}

=>
LBB0_2:                                 ## %sw.bb
  callq   _f1
  popq    %rbp
  ret
LBB0_3:                                 ## %sw.bb1
  callq   _f2
  popq    %rbp
  ret
LBB0_4:                                 ## %sw.bb3
  callq   _f3
  popq    %rbp
  ret

This patch teaches codegenprep to duplicate returns when the return value
is a phi and where the phi operands are produced by tail calls followed by
an unconditional branch:

sw.bb7:                                           ; preds = %entry
  %call8 = tail call i32 @f5() nounwind
  br label %return
sw.bb9:                                           ; preds = %entry
  %call10 = tail call i32 @f6() nounwind
  br label %return
return:
  %retval.0 = phi i32 [ %call10, %sw.bb9 ], [ %call8, %sw.bb7 ], ... [ 0, %entry ]
  ret i32 %retval.0

This allows codegen to generate better code like this:

LBB0_2:                                 ## %sw.bb
        jmp     _f1                     ## TAILCALL
LBB0_3:                                 ## %sw.bb1
        jmp     _f2                     ## TAILCALL
LBB0_4:                                 ## %sw.bb3
        jmp     _f3                     ## TAILCALL

rdar://9147433


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127953 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-19 17:17:39 +00:00
Devang Patel
36fae67831 If an AllocaInst referred by DbgDeclareInst is used by a LoadInst then the LoadInst should also get a corresponding llvm.dbg.value intrinsic. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127924 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-18 23:45:43 +00:00
Devang Patel
79fcad85a4 Remove dead code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127923 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-18 23:33:58 +00:00
Devang Patel
9c5822a966 Consider debug info intrinsics pointing to null value as dead instructions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127922 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-18 23:28:02 +00:00
Andrew Trick
f3e6774880 Remove TargetData and ValueTracking includes. I didn't mean for them to sneak in my last checkin. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127842 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-18 00:36:39 +00:00
Andrew Trick
b12a754cce Added isValidRewrite() to check the result of ScalarEvolutionExpander. 
SCEV may generate expressions composed of multiple pointers, which can
lead to invalid GEP expansion. Until we can teach SCEV to follow strict
pointer rules, make sure no bad GEPs creep into IR.
Fixes rdar://problem/9038671.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127839 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-17 23:51:11 +00:00
Andrew Trick
ead71d59a7 whitespace 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127837 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-17 23:46:48 +00:00
Devang Patel
813c9a0f19 Try to not lose variable's debug info during instcombine. 
This is done by lowering dbg.declare intrinsic into dbg.value intrinsic.
Radar 9143931.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127834 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-17 22:18:16 +00:00
Devang Patel
5ee20680c7 Refactor into a separate utility function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127832 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-17 21:58:19 +00:00
Cameron Zwarich
1bcdb6ffad Fix a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127728 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-16 08:13:42 +00:00
Cameron Zwarich
85b0f468cf Only convert allocas to scalars if it is profitable. The profitability metric I 
chose is having a non-memcpy/memset use and being larger than any native integer
type. Originally I chose having an access of a size smaller than the total size
of the alloca, but this caused some minor issues on the spirit benchmark where
SRoA runs again after some inlining.

This fixes <rdar://problem/8613163>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127718 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-16 00:13:44 +00:00
Cameron Zwarich
deac268f89 Better use initializer lists. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127716 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-16 00:13:37 +00:00
Cameron Zwarich
d4c9c3e6b9 Add a clarifying comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127715 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-16 00:13:35 +00:00