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021c9d3bd4
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Author SHA1 Message Date
Chris Lattner
021c9d3bd4 make this logic a bit simpler. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121689 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 06:36:51 +00:00
Chris Lattner
3d5121314a split all the guts of SimplifyCFGOpt::run out into one function 
per terminator kind.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121688 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 06:25:44 +00:00
Chris Lattner
97bd89ece3 fix a bug in r121680 that upset the various buildbots. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121687 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 05:34:18 +00:00
Chris Lattner
979b8f1d8c refactor the speculative execution logic to be factored into the cond branch code instead of 
doing a cfg search for every block simplified.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121686 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 05:26:52 +00:00
Chris Lattner
eff7edf126 simplify a bunch of code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121685 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 05:20:28 +00:00
Chris Lattner
ef5002ba85 move HoistThenElseCodeToIf up to a more logical and efficient-to-handle place. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121684 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 05:15:29 +00:00
Chris Lattner
ddb97a2bf1 move 'MergeBlocksIntoPredecessor' call earlier. Use 
getSinglePredecessor to simplify code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121683 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 05:10:48 +00:00
Chris Lattner
97fdb898f5 factor new code out to a SimplifyBranchOnICmpChain helper function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121681 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 05:03:41 +00:00
Chris Lattner
7312a22ed6 enhance the "change or icmp's into switch" xform to handle one value in an 
'or sequence' that it doesn't understand.  This allows us to optimize
something insane like this:

int crud (unsigned char c, unsigned x)
 {
   if(((((((((( (int) c <= 32 ||
                    (int) c == 46) || (int) c == 44)
                  || (int) c == 58) || (int) c == 59) || (int) c == 60)
               || (int) c == 62) || (int) c == 34) || (int) c == 92)
            || (int) c == 39) != 0)
     foo();
 }

into:

define i32 @crud(i8 zeroext %c, i32 %x) nounwind ssp noredzone {
entry:
  %cmp = icmp ult i8 %c, 33
  br i1 %cmp, label %if.then, label %switch.early.test

switch.early.test:                                ; preds = %entry
  switch i8 %c, label %if.end [
    i8 39, label %if.then
    i8 44, label %if.then
    i8 58, label %if.then
    i8 59, label %if.then
    i8 60, label %if.then
    i8 62, label %if.then
    i8 46, label %if.then
    i8 92, label %if.then
    i8 34, label %if.then
  ]

by pulling the < comparison out ahead of the newly formed switch.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121680 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 04:50:38 +00:00
Chris Lattner
0aa749bde7 merge two very similar functions into one that has a bool argument. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121678 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 04:26:26 +00:00
Chris Lattner
662269d2ab don't bother handling non-canonical icmp's 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121676 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 04:18:32 +00:00
Chris Lattner
803a29d19f inline a function, making the result much simpler. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121675 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 04:15:19 +00:00
Chris Lattner
abf706703f Fix my previous patch to handle a degenerate case that the llvm-gcc 
bootstrap buildbot tripped over.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121674 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 03:43:57 +00:00
Chris Lattner
28acc13548 convert some methods to be static functions 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121673 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 03:30:12 +00:00
Chris Lattner
fca20f507c zap two more std::sorts. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121672 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 03:24:30 +00:00
Chris Lattner
61c77449c7 fix a fairly serious oversight with switch formation from 
or'd conditions.  Previously we'd compile something like this:

int crud (unsigned char c) {
   return c == 62 || c == 34 || c == 92;
}

into:

  switch i8 %c, label %lor.rhs [
    i8 62, label %lor.end
    i8 34, label %lor.end
  ]

lor.rhs:                                          ; preds = %entry
  %cmp8 = icmp eq i8 %c, 92
  br label %lor.end

lor.end:                                          ; preds = %entry, %entry, %lor.rhs
  %0 = phi i1 [ true, %entry ], [ %cmp8, %lor.rhs ], [ true, %entry ]
  %lor.ext = zext i1 %0 to i32
  ret i32 %lor.ext

which failed to merge the compare-with-92 into the switch.  With this patch
we simplify this all the way to:

  switch i8 %c, label %lor.rhs [
    i8 62, label %lor.end
    i8 34, label %lor.end
    i8 92, label %lor.end
  ]

lor.rhs:                                          ; preds = %entry
  br label %lor.end

lor.end:                                          ; preds = %entry, %entry, %entry, %lor.rhs
  %0 = phi i1 [ true, %entry ], [ false, %lor.rhs ], [ true, %entry ], [ true, %entry ]
  %lor.ext = zext i1 %0 to i32
  ret i32 %lor.ext

which is much better for codegen's switch lowering stuff.  This kicks in 33 times
on 176.gcc (for example) cutting 103 instructions off the generated code.





git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121671 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 03:18:54 +00:00
Chris Lattner
e991b5fdd5 simplify code and reduce indentation 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121670 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 02:38:13 +00:00
Chris Lattner
6d4d21e29d convert an std::sort to array_pod_sort. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121669 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 02:00:58 +00:00
Chris Lattner
cd4b709d73 move the "br (X == 0 | X == 1), T, F" -> switch optimization to a new 
location in simplifycfg.  In the old days, SimplifyCFG was never run on
the entry block, so we had to scan over all preds of the BB passed into
simplifycfg to do this xform, now we can just check blocks ending with
a condbranch.  This avoids a scan over all preds of every simplified 
block, which should be a significant compile-time perf win on functions
with lots of edges.  No functionality change.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121668 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 01:57:34 +00:00
Chris Lattner
9a2b72acc9 reduce indentation and generally simplify code, no functionality change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121667 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 01:47:07 +00:00
Chris Lattner
dcb54ce3da use getFirstNonPHIOrDbg to simplify this code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121664 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-13 01:28:06 +00:00
Benjamin Kramer
2f7228b80c Generalize the and-icmp-select instcombine further by allowing selects of the form 
(x & 2^n) ? 2^m+C : C

we can offset both arms by C to get the "(x & 2^n) ? 2^m : 0" form, optimize the
select to a shift and apply the offset afterwards.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121609 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-11 10:49:22 +00:00
Benjamin Kramer
20e3b4b380 Factor the (x & 2^n) ? 2^m : 0 instcombine into its own method and generalize it 
to catch cases where n != m with a shift.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121608 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-11 09:42:59 +00:00
Chris Lattner
8fdca6a873 enhance memcpyopt to zap memcpy's that have the same src/dst. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121362 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-09 07:45:45 +00:00
Chris Lattner
f7f35467a9 fix PR8753, eliminating a case where we'd infinitely make a 
substitution because it doesn't actually change the IR.  Patch by
Jakub Staszak!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121361 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-09 07:39:50 +00:00
Dan Gohman
d8e0c0438a Really check that the bits that will become zero are actually already zero 
before eliminating the operation that zeros them. This fixes rdar://8739316.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121353 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-09 02:52:17 +00:00
Frits van Bommel
8e8cdc8fe0 Remove some dead code from the jump threading pass. 
The last uses of these functions were removed in r113852 when LazyValueInfo was permanently enabled and removed the need for them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121133 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-07 13:08:07 +00:00
Jay Foad
40f8f6264d PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and 
zextOrTrunc(), and APSInt methods extend(), extOrTrunc() and new method
trunc(), to be const and to return a new value instead of modifying the
object in place.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121120 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-07 08:25:19 +00:00
Chris Lattner
1945d58025 reapply r121100 with a tweak to constant fold ConstExprs with TargetData 
(if available) as we go so that we get simple constantexprs not insane ones.
This fixes the failure of clang/test/CodeGenCXX/virtual-base-ctor.cpp
that the previous iteration of this patch had.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121111 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-07 04:33:29 +00:00
Eric Christopher
6a3e305326 Temporarily revert r121100 as it's causing clang to fail 
CodeGenCXX/virtual-base-ctor.cpp.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121102 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-07 02:41:11 +00:00
Chris Lattner
fb431099c5 fix PR8710 - teach global opt that some constantexprs are too complex to 
put in a global variable's initializer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121100 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-07 01:59:32 +00:00
Frits van Bommel
6033b346e2 Implement jump threading of 'indirectbr' by keeping track of whether we're looking for ConstantInt*s or BlockAddress*s. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121066 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-06 23:36:56 +00:00
Chris Lattner
f51a6cc5bf replace a linear scan with a symtab lookup, reduce indentation. 
No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121042 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-06 21:53:07 +00:00
Chris Lattner
29d8d6b039 Use a stronger predicate here, pointed out by Duncan 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121040 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-06 21:48:10 +00:00
Chris Lattner
a9d4da85d6 add some DEBUG statements. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121038 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-06 21:13:51 +00:00
Chris Lattner
6c3ee0f3c9 Fix PR8735, a really terrible problem in the inliner's "alloca merging" 
optimization.

Consider:
static void foo() {
  A = alloca
  ...
}

static void bar() {
  B = alloca
  ...
  call foo();
}

void main() {
  bar()
}

The inliner proceeds bottom up, but lets pretend it decides not to inline foo
into bar.  When it gets to main, it inlines bar into main(), and says "hey, I
just inlined an alloca "B" into main, lets remember that.  Then it keeps going
and finds that it now contains a call to foo.  It decides to inline foo into
main, and says "hey, foo has an alloca A, and I have an alloca B from another
inlined call site, lets reuse it".  The problem with this of course, is that 
the lifetime of A and B are nested, not disjoint.

Unfortunately I can't create a reasonable testcase for this: the one in the
PR is both huge and extremely sensitive, because you minor tweaks end up
causing foo to get inlined into bar too early.  We already have tests for the
basic alloca merging optimization and this does not break them.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120995 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-06 07:52:42 +00:00
Chris Lattner
39add23dc5 improve comment 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120994 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-06 07:43:04 +00:00
Chris Lattner
7d32b8032d improve -debug output and comments a little. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120993 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-06 07:38:40 +00:00
Chris Lattner
cc10244d77 Fix PR8728, a miscompilation I recently introduced. When optimizing 
memcpy's like:
  memcpy(A, B)
  memcpy(A, C)

we cannot delete the first memcpy as dead if A and C might be aliases.
If so, we actually get:

  memcpy(A, B)
  memcpy(A, A)

which is not correct to transform into:

  memcpy(A, A)

This patch was heavily influenced by Jakub Staszak's patch in PR8728, thanks
Jakub!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120974 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-06 01:48:06 +00:00
Frits van Bommel
ea388f217b Refactor jump threading. 
Should have no functional change other than the order of two transformations that are mutually-exclusive and the exact formatting of debug output.
Internally, it now stores the ConstantInt*s as Constant*s, and actual undef values instead of nulls.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120946 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-05 19:06:41 +00:00
Frits van Bommel
6f9a8307e0 Remove trailing whitespace. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120945 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-05 19:02:47 +00:00
Frits van Bommel
7ac40c3ffa Teach SimplifyCFG to turn 
(indirectbr (select cond, blockaddress(@fn, BlockA),
                            blockaddress(@fn, BlockB)))
into
  (br cond, BlockA, BlockB).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120943 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-05 18:29:03 +00:00
Jay Foad
7a874ddda0 PR5207: Rename overloaded APInt methods set(), clear(), flip() to 
setAllBits(), setBit(unsigned), etc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120564 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-01 08:53:58 +00:00
Chris Lattner
b5a3196f80 fix a bozo bug I introduced in r119930, causing a miscompile of 
20040709-1.c from the gcc testsuite.  I was using the size of a
pointer instead of the pointee.  This fixes rdar://8713376


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120519 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-12-01 01:24:55 +00:00
Chris Lattner
3161ae1867 Enhance DSE to handle the variable index case in PR8657. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120498 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-11-30 23:43:23 +00:00
Chris Lattner
a04096580a teach DSE to use GetPointerBaseWithConstantOffset to analyze 
may-aliasing stores that partially overlap with different base
pointers.  This implements PR6043 and the non-variable part of
PR8657


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120485 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-11-30 23:05:20 +00:00
Chris Lattner
ed58a6f96f move GetPointerBaseWithConstantOffset out of GVN into ValueTracking.h 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120476 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-11-30 22:25:26 +00:00
Chris Lattner
fcf8d7c73d remove a fixed fixme 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120474 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-11-30 22:18:11 +00:00
Chris Lattner
7c80c15a8b Make DeleteDeadInstruction be a static function, move some code around. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120471 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-11-30 21:58:14 +00:00
Chris Lattner
d8d35316de switch RemoveAccessedObjects to use AliasAnalysis::Location to simplify 
the code.  We now get accurate sizes on Loads, though it surely doesn't
matter in practice.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120469 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-11-30 21:47:58 +00:00