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84 Commits

Author SHA1 Message Date
Owen Anderson 8f306a779b Re-apply the infamous r108614, with a fix pointed out by Dirk Steinke. 
llvm-svn: 110036
 2010-08-02 09:32:13 +00:00
Daniel Dunbar 0b636a24c7 Speculatively revert r108614, "Another attempt at getting the clang self-host to 
like my instcombine patch.", in an attempt to fix Clang i386 bootstrap.
 - Also PR7719.

llvm-svn: 109953
 2010-07-31 19:51:11 +00:00
Owen Anderson 7d2818b073 Another attempt at getting the clang self-host to like my instcombine patch. 
llvm-svn: 108614
 2010-07-17 06:56:35 +00:00
Eric Christopher 15a81cddb4 Also revert 108422, it's causing some test failures. 
Working on testcases for Owen.

llvm-svn: 108494
 2010-07-16 01:36:12 +00:00
Owen Anderson eaf64d5c1e Speculatively revert r108429 to fix the clang self-host. 
llvm-svn: 108436
 2010-07-15 18:18:57 +00:00
Owen Anderson eb08d01061 Per Chris' suggestion, get rid of the select canonicalization and just add 
the corresponding or-icmp-and pattern.  This has the added benefit of doing
the matching earlier, and thus being less susceptible to being confused by
earlier transforms.

llvm-svn: 108429
 2010-07-15 17:24:23 +00:00
Owen Anderson 7151dfd48a Reapply r108378, with bugfixes, testcase, and improved comment formatting. 
This now passes LIT, nighty test, and llvm-gcc bootstrap on my machine.

llvm-svn: 108422
 2010-07-15 15:00:23 +00:00
Eli Friedman a8b4e3732b Speculatively revert r108378; may be causing bootstrap failures. 
llvm-svn: 108389
 2010-07-15 00:33:00 +00:00
Owen Anderson 37d91d84af Add instcombine transforms to optimize tests of multiple bits of the same value into a single larger comparison. 
llvm-svn: 108378
 2010-07-14 23:33:51 +00:00
Chris Lattner ec0e7b1643 revert r108320, I see the failures now... 
llvm-svn: 108322
 2010-07-14 06:16:35 +00:00
Chris Lattner 658680b2f5 reapply benjamin's instcombine patch, I don't see anything wrong with it and can't repro any problems with a manual self-host. 
llvm-svn: 108320
 2010-07-14 05:59:13 +00:00
Benjamin Kramer 8f36402ac2 Nope, still breaks the release selfhost bots :( 
llvm-svn: 108153
 2010-07-12 16:38:48 +00:00
Benjamin Kramer 07b695e052 Reapply the "or" half of r108136, which seems to be less problematic. 
llvm-svn: 108152
 2010-07-12 16:15:48 +00:00
Benjamin Kramer c719e8ae9e Revert r108141 again, sigh. 
llvm-svn: 108148
 2010-07-12 14:42:04 +00:00
Benjamin Kramer f578c36035 Reapply 108136 with an ugly pasto fixed. 
llvm-svn: 108141
 2010-07-12 13:44:00 +00:00
Benjamin Kramer 11743249e6 Move optimization to avoid redundant matching. 
llvm-svn: 108140
 2010-07-12 13:34:22 +00:00
Benjamin Kramer 9675e759cf Revert r108136 until I figure out why it broke selfhost. 
llvm-svn: 108139
 2010-07-12 12:35:49 +00:00
Benjamin Kramer 35473faa50 instcombine: fold (x & y) | (~x & z) and (x & y) ^ (~x & z) into ((y ^ z) & x) ^ z which is one instruction shorter. (PR6773) 
before:
  %and = and i32 %y, %x
  %neg = xor i32 %x, -1
  %and4 = and i32 %z, %neg
  %xor = xor i32 %and4, %and

after:
  %xor1 = xor i32 %z, %y
  %and2 = and i32 %xor1, %x
  %xor = xor i32 %and2, %z

llvm-svn: 108136
 2010-07-12 11:54:45 +00:00
Dan Gohman 0a8175d1db Minor code simplification. 
llvm-svn: 100859
 2010-04-09 14:53:59 +00:00
Chris Lattner 067459c62b Fix PR6503. This turned into a much more interesting and nasty bug. Various 
parts of the cmp|cmp and cmp&cmp folding logic wasn't prepared for vectors
(unrelated to the bug but noticed while in the code) and the code was 
*definitely* not safe to use by the (cast icmp)|(cast icmp) handling logic
that I added in r95855.  Fix all this up by changing the various routines
to more consistently use IRBuilder and not pass in the I which had the wrong 
type.

llvm-svn: 97801
 2010-03-05 08:46:26 +00:00
Chris Lattner 343d2e48b2 simplify some functions and make them work with vector 
compares, noticed by inspection.

llvm-svn: 97795
 2010-03-05 07:47:57 +00:00
Bill Wendling af13d82945 This test case: 
long test(long x) { return (x & 123124) | 3; }

Currently compiles to:

_test:
        orl     $3, %edi
        movq    %rdi, %rax
        andq    $123127, %rax
        ret

This is because instruction and DAG combiners canonicalize

  (or (and x, C), D) -> (and (or, D), (C | D))

However, this is only profitable if (C & D) != 0. It gets in the way of the
3-addressification because the input bits are known to be zero.

llvm-svn: 97616
 2010-03-03 00:35:56 +00:00
Duncan Sands 19d0b47b1f There are two ways of checking for a given type, for example isa<PointerType>(T) 
and T->isPointerTy().  Convert most instances of the first form to the second form.
Requested by Chris.

llvm-svn: 96344
 2010-02-16 11:11:14 +00:00
Duncan Sands 9dff9bec31 Uniformize the names of type predicates: rather than having isFloatTy and 
isInteger, we now have isFloatTy and isIntegerTy.  Requested by Chris!

llvm-svn: 96223
 2010-02-15 16:12:20 +00:00
Chris Lattner 4e8137d678 Rename ValueRequiresCast to ShouldOptimizeCast, to better reflect 
what it does.  Enhance it to return false to optimizing vector
sign extensions from vector comparisions, which is the idiom used
to get a splatted vector for a vector comparison.

Doing this breaks vector-casts.ll, add some compensating 
transformations to handle the important case they cover without
depending on this canonicalization.

This fixes rdar://7434900 a serious pessimization of vector compares.

llvm-svn: 95855
 2010-02-11 06:26:33 +00:00
Dan Gohman 4a618827de Fix "the the" and similar typos. 
llvm-svn: 95781
 2010-02-10 16:03:48 +00:00
Chris Lattner f4c8d3cea9 simplify this code, duh. 
llvm-svn: 95643
 2010-02-09 01:14:06 +00:00
Chris Lattner 9b6a1789e5 fix PR6193, only considering sign extensions *from i1* for this 
xform.

llvm-svn: 95642
 2010-02-09 01:12:41 +00:00
Chris Lattner 64ffd11d49 fix logical-select to invoke filecheck right, and fix hte instcombine 
xform it is checking to actually pass.  There is no need to match
m_SelectCst<0, -1> since instcombine canonicalizes that into not(sext).

Add matches for sext(not(x)) in addition to not(sext(x)).

llvm-svn: 95420
 2010-02-05 19:53:02 +00:00
Chris Lattner 8e2c471614 don't turn (A & (C0?-1:0)) | (B & ~(C0?-1:0)) -> C0 ? A : B 
for vectors.  Codegen is generating awful code or segfaulting
in various cases (e.g. PR6204).

llvm-svn: 95058
 2010-02-02 02:43:51 +00:00
Chris Lattner 1b35bbe813 change the canonical form of "cond ? -1 : 0" to be 
"sext cond" instead of a select.  This simplifies some instcombine
code, matches the policy for zext (cond ? 1 : 0 -> zext), and allows
us to generate better code for a testcase on ppc.

llvm-svn: 94339
 2010-01-24 00:09:49 +00:00
Chris Lattner 18f49ce2d3 optimize ~(~X >>s Y) --> (X >>s Y), patch by Edmund Grimley 
Evans!

llvm-svn: 93884
 2010-01-19 18:16:19 +00:00
Chris Lattner 9518869423 add one more bitfield optimization, allowing clang to generate 
good code on PR4216:

_test_bitfield:                                             ## @test_bitfield
	orl	$32962, %edi
	movl	$4294941946, %eax
	andq	%rdi, %rax
	ret

instead of:

_test_bitfield:
        movl    $4294941696, %ecx
        movl    %edi, %eax
        orl     $194, %edi
        orl     $32768, %eax
        andq    $250, %rdi
        andq    %rax, %rcx
        movq    %rdi, %rax
        orq     %rcx, %rax
        ret

Evan is looking into the remaining andq+imm -> andl optimization.

llvm-svn: 93147
 2010-01-11 06:55:24 +00:00
Chris Lattner 0a8191ee88 split and/or/xor out into one overly-large (2000LOC) file. However, I think 
it does make sense to keep them together, at least for now.

llvm-svn: 92711
 2010-01-05 07:50:36 +00:00