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280 Commits

Author SHA1 Message Date
Chris Lattner
e7dc7e1e5b a serious "compare CSE" issue that is nontrivial to get right, 
but which is responsible for us doing really bad things to 256.bzip2.

llvm-svn: 126126
 2011-02-21 17:03:47 +00:00
Cameron Zwarich
3384d8f317 A lo/hi mul has higher latency than an imul r,ri, e.g. 5 cycles compared to 3 
on Core 2 and Nehalem, so the code we generate is better than GCC's here.

llvm-svn: 126100
 2011-02-21 01:29:32 +00:00
Cameron Zwarich
b7e676db6c The signed version of our "magic number" computation for the integer approximation 
of a constant had a minor typo introduced when copying it from the book, which
caused it to favor negative approximations over positive approximations in many
cases. Positive approximations require fewer operations beyond the multiplication.

In the case of division by 3, we still generate code that is a single instruction
larger than GCC's code.

llvm-svn: 126097
 2011-02-21 00:22:02 +00:00
Eli Friedman
0ad25251cb Minor x86 README updates. 
llvm-svn: 126054
 2011-02-19 21:54:28 +00:00
Chris Lattner
2aebf9f4ad add a poor division by constant case. 
llvm-svn: 125832
 2011-02-18 05:35:49 +00:00
Chris Lattner
222b24e2de update a bunch of entries. 
llvm-svn: 122700
 2011-01-02 18:31:38 +00:00
Chris Lattner
a6f2b8316f fix some sort of weird pasto 
llvm-svn: 122560
 2010-12-26 12:05:11 +00:00
Chris Lattner
eec079a470 add a note 
llvm-svn: 122559
 2010-12-26 03:53:31 +00:00
Benjamin Kramer
b21118c91b Remove some obsolete README items, add a new one off the top of my head. 
llvm-svn: 122495
 2010-12-23 15:07:02 +00:00
Benjamin Kramer
d8387aa9bd X86: Lower a select directly to a setcc_carry if possible. 
int test(unsigned long a, unsigned long b) { return -(a < b); }
compiles to
  _test:                              ## @test
    cmpq  %rsi, %rdi                  ## encoding: [0x48,0x39,0xf7]
    sbbl  %eax, %eax                  ## encoding: [0x19,0xc0]
    ret                               ## encoding: [0xc3]
instead of
  _test:                              ## @test
    xorl  %ecx, %ecx                  ## encoding: [0x31,0xc9]
    cmpq  %rsi, %rdi                  ## encoding: [0x48,0x39,0xf7]
    movl  $-1, %eax                   ## encoding: [0xb8,0xff,0xff,0xff,0xff]
    cmovael %ecx, %eax                ## encoding: [0x0f,0x43,0xc1]
    ret                               ## encoding: [0xc3]

llvm-svn: 122451
 2010-12-22 23:09:28 +00:00
Benjamin Kramer
5a1721f4ac 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.

llvm-svn: 121608
 2010-12-11 09:42:59 +00:00
Evan Cheng
f7e586d749 Enable sibling call optimization of libcalls which are expanded during 
legalization time. Since at legalization time there is no mapping from
SDNode back to the corresponding LLVM instruction and the return
SDNode is target specific, this requires a target hook to check for
eligibility. Only x86 and ARM support this form of sibcall optimization
right now.
rdar://8707777

llvm-svn: 120501
 2010-11-30 23:55:39 +00:00
Chris Lattner
dd03f96698 apparently tailcalls are better on darwin/x86-64 than on linux? 
llvm-svn: 119947
 2010-11-21 18:59:20 +00:00
Dan Gohman
6824bfc554 Don't narrow the load and store in a load+twiddle+store sequence unless 
there are clearly no stores between the load and the store. This fixes
this miscompile reported as PR7833.

This breaks the test/CodeGen/X86/narrow_op-2.ll optimization, which is
safe, but awkward to prove safe. Move it to X86's README.txt.

llvm-svn: 112861
 2010-09-02 21:18:42 +00:00
Eli Friedman
6ccafafe61 A couple of small missed optimizations. 
llvm-svn: 112411
 2010-08-29 05:07:40 +00:00
Eric Christopher
4924d5fb93 Custom lower the memory barrier instructions and add support 
for lowering without sse2.  Add a couple of new testcases.

Fixes a few libgomp tests and latent bugs.  Remove a few todos.

llvm-svn: 109078
 2010-07-22 02:48:34 +00:00
Eli Friedman
fbfaab45a3 Remove a fixed item, update a couple partially-fixed items. 
llvm-svn: 105375
 2010-06-03 01:01:48 +00:00
Dan Gohman
0d46f3e9e6 This is now done. 
llvm-svn: 97450
 2010-03-01 17:43:57 +00:00
Eli Friedman
63e676c905 A few missed optimizations; the last one could have a significant impact on 
code with lots of bitfields.

llvm-svn: 95809
 2010-02-10 21:26:04 +00:00
Chris Lattner
72a06499b3 this is an SSE-specific issue. 
llvm-svn: 93373
 2010-01-13 23:29:11 +00:00
Chris Lattner
0aa093dbdf X86 if conversion + tail merging issues from PR6032. 
llvm-svn: 93372
 2010-01-13 23:28:40 +00:00
Dan Gohman
f5f090c2c5 Remove some README.txt entries which are now implemented. 
llvm-svn: 92511
 2010-01-04 20:55:05 +00:00
Eli Friedman
50c8e9154f A couple minor README updates. 
llvm-svn: 91823
 2009-12-21 08:03:16 +00:00
Bill Wendling
cb9a2f20d5 Move and clarify note. 
llvm-svn: 85334
 2009-10-27 22:48:31 +00:00
Bill Wendling
2aaf2ae6e1 Note corrected. 
llvm-svn: 85332
 2009-10-27 22:43:24 +00:00
Bill Wendling
3e4dd02a1e Modify note. 
llvm-svn: 85331
 2009-10-27 22:40:45 +00:00
Bill Wendling
3edf1d3854 Add a note. 
llvm-svn: 85329
 2009-10-27 22:34:43 +00:00
Evan Cheng
20a1862b23 Add a note. 
llvm-svn: 77584
 2009-07-30 08:56:19 +00:00
Chris Lattner
7d0212b87d remove a bogus note. 
llvm-svn: 74509
 2009-06-30 05:22:31 +00:00
Chris Lattner
903e3854e0 add a note 
llvm-svn: 74508
 2009-06-30 04:20:46 +00:00
Chris Lattner
001e9a5857 another xform that is target-independent (should be done in instcombine). 
llvm-svn: 73472
 2009-06-16 06:15:56 +00:00
Chris Lattner
b38b0eb4e0 I think instcombine should unconditionally do this xform. 
llvm-svn: 73471
 2009-06-16 06:11:35 +00:00
Eli Friedman
74e9f6c070 Misc x86 README updates: remove a couple of already-fixed issues, 
add a few suggestions from looking at some assembly code.

llvm-svn: 73210
 2009-06-11 23:07:04 +00:00
Chris Lattner
636bd70540 add some late optimizations that GCC does. It thinks these are a win 
even on Core2, not just AMD processors which was a surprise to me.

llvm-svn: 72396
 2009-05-25 20:28:19 +00:00
Chris Lattner
60098b3e93 we should eventually add -march=atom and the new atom movbe instruction. 
llvm-svn: 72387
 2009-05-25 16:34:44 +00:00
Chris Lattner
26a971c4ec Move 3 "(add (select cc, 0, c), x) -> (select cc, x, (add, x, c))" 
related transformations out of target-specific dag combine into the
ARM backend.  These were added by Evan in r37685 with no testcases
and only seems to help ARM (e.g. test/CodeGen/ARM/select_xform.ll).

Add some simple X86-specific (for now) DAG combines that turn things
like cond ? 8 : 0  -> (zext(cond) << 3).  This happens frequently
with the recently added cp constant select optimization, but is a
very general xform.  For example, we now compile the second example
in const-select.ll to:

_test:
        movsd   LCPI2_0, %xmm0
        ucomisd 8(%esp), %xmm0
        seta    %al
        movzbl  %al, %eax
        movl    4(%esp), %ecx
        movsbl  (%ecx,%eax,4), %eax
        ret

instead of:

_test:
        movl    4(%esp), %eax
        leal    4(%eax), %ecx
        movsd   LCPI2_0, %xmm0
        ucomisd 8(%esp), %xmm0
        cmovbe  %eax, %ecx
        movsbl  (%ecx), %eax
        ret

This passes multisource and dejagnu.

llvm-svn: 66779
 2009-03-12 06:52:53 +00:00
Dan Gohman
e15d8f03c3 Add more information to the EFLAGS note. 
llvm-svn: 66515
 2009-03-10 00:26:23 +00:00
Dan Gohman
995c3dd344 Add a note about EFLAGS optimization. 
llvm-svn: 66508
 2009-03-09 23:47:02 +00:00
Chris Lattner
3342ba06d4 add a note. 
llvm-svn: 66360
 2009-03-08 03:04:26 +00:00
Chris Lattner
8ace06fdda add a note. 
llvm-svn: 66359
 2009-03-08 01:54:43 +00:00
Chris Lattner
3b67310686 add a horrible note 
llvm-svn: 64719
 2009-02-17 01:16:14 +00:00
Dan Gohman
856736a187 MachineLICM now handles these cases. 
llvm-svn: 64620
 2009-02-15 23:24:52 +00:00
Chris Lattner
a50a554333 add a note. 
llvm-svn: 64093
 2009-02-08 20:44:19 +00:00
Chris Lattner
00104cf8f8 add a note 
llvm-svn: 60632
 2008-12-06 22:49:05 +00:00
Eli Friedman
3b8efd50d7 A couple small cleanups, plus a new potential optimization. 
llvm-svn: 60286
 2008-11-30 07:52:27 +00:00
Evan Cheng
82b17df2b0 Add a README entry. 
llvm-svn: 59052
 2008-11-11 17:35:52 +00:00
Torok Edwin
e0ecce06a0 move the note to the correct README 
llvm-svn: 58104
 2008-10-24 19:23:07 +00:00
Dan Gohman
69ac9cc00f This is done. 
llvm-svn: 57733
 2008-10-17 21:38:40 +00:00
Evan Cheng
65d29b2553 This is done. 
llvm-svn: 55348
 2008-08-26 01:13:44 +00:00
Nate Begeman
64f8f7f6bb Remove unnecessary readme entry 
llvm-svn: 53722
 2008-07-17 17:21:14 +00:00