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Author SHA1 Message Date
Devang Patel
44c92e5826 Remove oversimplified test case. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92510 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 20:54:06 +00:00
Dan Gohman
b75e8642a6 Add some tests and update an existing test to reflect recent 
x86 isel peeps.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92509 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 20:53:54 +00:00
Dan Gohman
3cc4a307a8 A use by operand 1 or 2 of a SELECT is not a FLAGS use. This 
lets the test-elimination work in more conditional-move cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92508 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 20:52:50 +00:00
Dan Gohman
9ef51c8011 Flags-producing add, and, or, etc. have the same profibility 
rules as normal add, and, or, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92507 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 20:51:50 +00:00
Dan Gohman
43ffe6769a Add SDNPCommutative and SDNPAssociative to several X86 target nodes. 
This lets isel fold loads into them in more cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92506 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 20:51:05 +00:00
Devang Patel
344130e8ab Fix begin and end markers for nested scopes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92505 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 20:44:00 +00:00
Dan Gohman
ba7a662f54 Replace some special-case code which probably was buggy with an assertion 
verifying that the special case does not occur.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92504 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 20:36:57 +00:00
Dan Gohman
537ab90d8d Remove the CPAttrParentAsRoot code, which is unused, and inconvenient 
for a refactoring I'm working on.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92503 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 20:31:55 +00:00
David Greene
6e120a1c70 Change errs() to dbgs(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92502 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 19:57:26 +00:00
Devang Patel
9f5c510df1 The test, derived from optimzed IR, does not mention "bar" in debug info anywhere so the dwarf writer is not expected to emit any debug info for function "bar". 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92499 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 19:41:13 +00:00
David Greene
5957c9b8aa Change errs() to dbgs(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92498 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 19:36:42 +00:00
David Greene
26045e25bf Change errs() to dbgs(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92496 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 19:10:20 +00:00
Chris Lattner
d7f5a58890 Truncate GEP indexes larger than the pointer size down to pointer size 
when doing this transform if the GEP is not inbounds.  No testcase because
it is very difficult to trigger this: instcombine already canonicalizes
GEP indices to pointer size, so it relies specific permutations of the
instcombine worklist.

Thanks to Duncan for pointing this possible problem out.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92495 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 18:57:15 +00:00
Chris Lattner
0cb1e9edd5 silence a bogus 'might be used uninit' warning from GCC. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92494 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 18:48:26 +00:00
Dan Gohman
7ba4e17285 Add a comment. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92492 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 18:38:39 +00:00
David Greene
89d6a24262 Change errs() to dbgs(). 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92490 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 17:47:05 +00:00
Anton Korobeynikov
39784e158a Fix invalid chain folding for memory variant of sdiv / udiv 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92472 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 10:31:54 +00:00
Chris Lattner
f3d1b5dd68 move some more cast-related stuff 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92471 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:59:07 +00:00
Mikhail Glushenkov
ed5cb593ef 80-col violations, trailing whitespace. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92470 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:55:25 +00:00
Chris Lattner
5f0290e0ef move the [Can]EvaluateInDifferentType functions out to InstCombineCasts.cpp 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92469 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:54:59 +00:00
Chris Lattner
80f43d339f split 943 lines of instcombine out to a new InstCombineCasts.cpp 
file.  InstructionCombining.cpp is now down to a svelte 9300 lines :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92468 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:53:58 +00:00
Chris Lattner
02446fc99a split instcombine of compares (visit[FI]Cmp) out to 
a new InstCombineCompares.cpp file.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92467 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:37:31 +00:00
Chris Lattner
a766e19705 update cmakefile 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92466 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:19:55 +00:00
Chris Lattner
e0b4b721aa move the 'SimplifyDemandedFoo' methods out to their own file, cutting 1K lines out of instcombine.cpp 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92465 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:17:19 +00:00
Mikhail Glushenkov
710632d07b Fix the Emacs mode string. 
Also trailing whitespace & 80-col violations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92464 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:16:12 +00:00
Chris Lattner
ac8f2fd2e2 split the instcombine class definition out to a header shared 
among the instcombine library.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92463 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:12:23 +00:00
Chris Lattner
4de84762bd remove a ton of unneeded LLVMContext stuff. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92462 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 07:02:48 +00:00
Chris Lattner
3df5c6fff1 move InstCombineWorklist out to its own header. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92461 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 06:30:00 +00:00
Chris Lattner
ce6daa4c58 forgot to svn add these. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92460 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 06:28:20 +00:00
Chris Lattner
dffbef0d76 move instcombine to its own library, it's past time. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92459 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 06:23:24 +00:00
Chris Lattner
e4412c1f0b implement an instcombine xform needed by clang's codegen 
on the example in PR4216.  This doesn't trigger in the testsuite,
so I'd really appreciate someone scrutinizing the logic for
correctness.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92458 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-04 06:03:59 +00:00
Chris Lattner
d0592d3be6 fix PR5930, allowing the asmprinter to emit difference between 
two labels as a truncate.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92455 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-03 18:33:18 +00:00
Chris Lattner
fa5dd977e4 it isn't safe to speculative load from a malloc, it might have 
returned null, and may not have been big enough in any case.  
Thanks to Jay Foad for pointing this out!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92452 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-03 18:14:24 +00:00
Chris Lattner
2ef90d782e add PR# 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92451 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-03 18:10:58 +00:00
Chris Lattner
5099b31f98 differences between two blockaddress's don't cause a 
global variable initializer to require relocations.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92450 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-03 18:09:40 +00:00
Chris Lattner
a0085af871 pull my debug hooks out, I'm done with this xform for now. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92446 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-03 06:58:48 +00:00
Nick Lewycky
cccbe7e415 Small cleanups, refactor some duplicated code into a single method. No 
functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92445 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-03 04:39:07 +00:00
Chris Lattner
56ba7a74b9 generalize the previous transformation to handle indexing into 
arrays of structs and other arrays, so long as all the subsequent
indexes are constants.  This triggers frequently for stuff like:

@divisions = internal constant [29 x [2 x i32]] [[2 x i32] zeroinitializer, [2 x i32] [i32 0, i32 1], [2 x i32] [i32 0, i32 2], [2 x i32] [i32 0, i32 1], [2 x i32] zeroinitializer, [2 x i32] [i32 0, i32 1], [2 x i32] [i32 0, i32 1], [2 x i32] [i32 0, i32 2], [2 x i32] [i32 0, i32 2], [2 x i32] zeroinitializer, [2 x i32] zeroinitializer, [2 x i32] zeroinitializer, [2 x i32] [i32 0, i32 2], [2 x i32] [i32 0, i32 1], [2 x i32] zeroinitializer, [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 1], [2 x i32] [i32 1, i32 1], [2 x i32] [i32 1, i32 2], [2 x i32] [i32 1, i32 1], [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 2], [2 x i32] [i32 1, i32 2], [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 0], [2 x i32] [i32 1, i32 1], [2 x i32] [i32 1, i32 2], [2 x i32] [i32 1, i32 2]], align 32 ; <[29 x [2 x i32]]*> [#uses=50]

	  %623 = getelementptr inbounds [29 x [2 x i32]]* @divisions, i64 0, i64 %619, i64 0 ; <i32*> [#uses=1]
	   %684 = icmp eq i32 %683, 999 

also for the "my_defs" table in 'gs', etc.




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92444 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-03 03:03:27 +00:00
Nick Lewycky
11ed0317bc Cleanup. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92436 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-03 00:55:31 +00:00
Chris Lattner
df3d63b896 teach instcombine to optimize idioms like A[i]&42 == 0. This 
occurs in 403.gcc in mode_mask_array, in safe-ctype.c (which
is copied in multiple apps) in _sch_istable, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92427 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 22:08:28 +00:00
Chris Lattner
b4f82b4b4f Teach the table lookup optimization to generate range compares 
when a consequtive sequence of elements all satisfies the 
predicate.  Like the double compare case, this generates better
code than the magic constant case and generalizes to more than
32/64 element array lookups.

Here are some examples where it triggers.  From 403.gcc, most
accesses to the rtx_class array are handled, e.g.:

@rtx_class = constant [153 x i8] c"xxxxxmmmmmmmmxxxxxxxxxxxxmxxxxxxiiixxxxxxxxxxxxxxxxxxxooxooooooxxoooooox3x2c21c2222ccc122222ccccaaaaaa<<<<<<<<<<<<<<<<<<111111111111bbooxxxxxxxxxxcc2211x", align 32 ; <[153 x i8]*> [#uses=547]
   %142 = icmp eq i8 %141, 105
@rtx_class = constant [153 x i8] c"xxxxxmmmmmmmmxxxxxxxxxxxxmxxxxxxiiixxxxxxxxxxxxxxxxxxxooxooooooxxoooooox3x2c21c2222ccc122222ccccaaaaaa<<<<<<<<<<<<<<<<<<111111111111bbooxxxxxxxxxxcc2211x", align 32 ; <[153 x i8]*> [#uses=543]
	   %165 = icmp eq i8 %164, 60      

Also, most of the 59-element arrays (mode_class/rid_to_yy, etc) 
optimized before are actually range compares.  This lets 32-bit
machines optimize them.

400.perlbmk has stuff like this:

400.perlbmk: PL_regkind, even for 32-bit:
@PL_regkind = constant [62 x i8] c"\00\00\02\02\02\06\06\06\06\09\09\0B\0B\0D\0E\0E\0E\11\12\12\14\14\16\16\18\18\1A\1A\1C\1C\1E\1F !!!$$&'((((,-.///88886789:;8$", align 32 ; <[62 x i8]*> [#uses=4]
	   %811 = icmp ne i8 %810, 33 

@PL_utf8skip = constant [256 x i8] c"\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\01\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\02\03\03\03\03\03\03\03\03\03\03\03\03\03\03\03\03\04\04\04\04\04\04\04\04\05\05\05\05\06\06\07\0D", align 32 ; <[256 x i8]*> [#uses=94]
	   %12 = icmp ult i8 %10, 2
           
etc.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92426 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 21:50:18 +00:00
Chris Lattner
1c91fae649 theoretically the negate we find could be in a different function, check 
for this case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92425 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 21:46:33 +00:00
Chris Lattner
82602bc089 use enums for the over/underdefined markers for clarity. Switch 
to using -2/-3 instead of -1/-2 for a future xform.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92423 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 20:20:33 +00:00
Chris Lattner
5fadf17709 remove the random sampling framework, which is not maintained anymore. 
If there is interest, it can be resurrected from SVN.  PR4912.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92422 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 20:07:03 +00:00
Nick Lewycky
f994bf00b5 Fix logic error in previous commit. The != case needs to become an or, not an 
and.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92419 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 16:14:56 +00:00
Nick Lewycky
546d63176e Optimize pointer comparison into the typesafe form, now that the backends will 
handle them efficiently. This is the opposite direction of the transformation
we used to have here.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92418 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 15:25:44 +00:00
Chris Lattner
bef37376be Generalize the previous xform to handle cases where exactly 
two elements match or don't match with two comparisons.  For
example, the testcase compiles into:

define i1 @test5(i32 %X) {
  %1 = icmp eq i32 %X, 2                          ; <i1> [#uses=1]
  %2 = icmp eq i32 %X, 7                          ; <i1> [#uses=1]
  %R = or i1 %1, %2                               ; <i1> [#uses=1]
  ret i1 %R
}

This generalizes the previous xforms when the array is larger than
64 elements (and this case matches) and generates better code for
cases where it overlaps with the magic bitshift case.

This generalizes more cases than you might expect.  For example,
400.perlbmk has:

@PL_utf8skip = constant [256 x i8] c"\01\01\01\...
%15 = icmp ult i8 %7, 7

403.gcc has:
@rid_to_yy = internal constant [114 x i16] [i16 259, i16 260, ...
%18 = icmp eq i16 %16, 295 

and xalancbmk has a bunch of examples, such as 
_ZN11xercesc_2_5L15gCombiningCharsE and _ZN11xercesc_2_5L10gBaseCharsE.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92417 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 09:35:17 +00:00
Chris Lattner
33a1ec76c2 fix a miscompilation I introduced of cdecl with a late change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92416 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 09:22:13 +00:00
Chris Lattner
10d514ee58 enhance the compare/load/index optimization to work on *any* load 
from a global with 32/64 elements or less (depending on whether
i64 is native on the target), generating a bitshift idiom to 
determine the result.  For example, on test4 we produce:

define i1 @test4(i32 %X) {
  %1 = lshr i32 933, %X                           ; <i32> [#uses=1]
  %2 = and i32 %1, 1                              ; <i32> [#uses=1]
  %R = icmp ne i32 %2, 0                          ; <i1> [#uses=1]
  ret i1 %R
}

This triggers in a number of interesting cases, for example, here's an
fp case:
@A.3255 = internal constant [4 x double] [double 4.100000e+00, double -3.900000e+00, double -1.000000e+00, double 1.000000e+00], align 32 ; <[4 x double]*> [#uses=7]
...
	   %7 = fcmp olt double %3, 0.000000e+00

In this case we make the slen2_tab global dead, which is nice:
@slen2_tab = internal constant [16 x i32] [i32 0, i32 1, i32 2, i32 3, i32 0, i32 1, i32 2, i32 3, i32 1, i32 2, i32 3, i32 1, i32 2, i32 3, i32 2, i32 3], align 32 ; <[16 x i32]*> [#uses=1]
...
	   %204 = icmp eq i32 %46, 0     

Perl has a bunch of these, also on the 'Perl_regkind' array:
@Perl_yygindex = internal constant [51 x i16] [i16 0, i16 0, i16 0, i16 0, i16 374, i16 351, i16 0, i16 -12, i16 0, i16 946, i16 413, i16 -83, i16 0, i16 0, i16 0, i16 -311, i16 -13, i16 4007, i16 2893, i16 0, i16 0, i16 0, i16 0, i16 0, i16 372, i16 -8, i16 0, i16 0, i16 246, i16 -131, i16 43, i16 86, i16 208, i16 -45, i16 -169, i16 987, i16 0, i16 0, i16 0, i16 0, i16 308, i16 0, i16 -271, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0, i16 0], align 32 ; <[51 x i16]*> [#uses=1]
...
  %1364 = icmp eq i16 %1361, 0

186.crafty really likes this on 64-bit machines, because it triggers on a bunch of globals like this:
@white_outpost = internal constant [64 x i8] c"\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\02\02\00\00\00\00\00\04\05\05\04\00\00\00\00\03\06\06\03\00\00\00\00\00\01\01\00\00\00\00\00\00\00\00\00\00\00", align 32 ; <[64 x i8]*> [#uses=2]

However the big winner is 403.gcc, which triggers hundreds of times, eliminating all the accesses to the 57-element arrays 'mode_class', mode_unit_size, mode_bitsize, regclass_map, etc.

go 64-bit machines :)




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92415 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 08:56:52 +00:00
Mikhail Glushenkov
364cf75c40 Forward -O0 to llvm-gcc. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92414 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-02 08:27:23 +00:00