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304 Commits

Author SHA1 Message Date
Bill Wendling a205402c16 Add a note. 
llvm-svn: 85329
 2009-10-27 22:34:43 +00:00
Evan Cheng 92df9c3323 Add a note. 
llvm-svn: 77584
 2009-07-30 08:56:19 +00:00
Chris Lattner b127c0684f remove a bogus note. 
llvm-svn: 74509
 2009-06-30 05:22:31 +00:00
Chris Lattner 5ed255e642 add a note 
llvm-svn: 74508
 2009-06-30 04:20:46 +00:00
Chris Lattner 0101f45785 another xform that is target-independent (should be done in instcombine). 
llvm-svn: 73472
 2009-06-16 06:15:56 +00:00
Chris Lattner aba55a69b1 I think instcombine should unconditionally do this xform. 
llvm-svn: 73471
 2009-06-16 06:11:35 +00:00
Eli Friedman 32ad5e9c08 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 9b65031add 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 be31b7b534 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 4147f08e44 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 b0d4009ec8 Add more information to the EFLAGS note. 
llvm-svn: 66515
 2009-03-10 00:26:23 +00:00
Dan Gohman d5b35ee215 Add a note about EFLAGS optimization. 
llvm-svn: 66508
 2009-03-09 23:47:02 +00:00
Chris Lattner 393ac62837 add a note. 
llvm-svn: 66360
 2009-03-08 03:04:26 +00:00
Chris Lattner cfd1f7aa9f add a note. 
llvm-svn: 66359
 2009-03-08 01:54:43 +00:00
Chris Lattner cba4b6f83d add a horrible note 
llvm-svn: 64719
 2009-02-17 01:16:14 +00:00
Dan Gohman f6ccacba36 MachineLICM now handles these cases. 
llvm-svn: 64620
 2009-02-15 23:24:52 +00:00
Chris Lattner 1aca40e349 add a note. 
llvm-svn: 64093
 2009-02-08 20:44:19 +00:00
Chris Lattner 527dd60430 add a note 
llvm-svn: 60632
 2008-12-06 22:49:05 +00:00
Eli Friedman e9ef170d4a A couple small cleanups, plus a new potential optimization. 
llvm-svn: 60286
 2008-11-30 07:52:27 +00:00
Evan Cheng 2d1937ede5 Add a README entry. 
llvm-svn: 59052
 2008-11-11 17:35:52 +00:00
Torok Edwin 33986d8f17 move the note to the correct README 
llvm-svn: 58104
 2008-10-24 19:23:07 +00:00
Dan Gohman b1d8d6ecff This is done. 
llvm-svn: 57733
 2008-10-17 21:38:40 +00:00
Evan Cheng 4884f87822 This is done. 
llvm-svn: 55348
 2008-08-26 01:13:44 +00:00
Nate Begeman 3851e29e20 Remove unnecessary readme entry 
llvm-svn: 53722
 2008-07-17 17:21:14 +00:00
Dan Gohman 02a2aaf2e7 Add a note about a potential PIC optimization. 
llvm-svn: 52663
 2008-06-24 00:53:07 +00:00
Chris Lattner 6e2bf7c67e add a micro optzn. 
llvm-svn: 50681
 2008-05-05 23:19:45 +00:00
Chris Lattner a89143f1e0 Add an ugly note. 
llvm-svn: 50029
 2008-04-21 04:46:30 +00:00
Evan Cheng 81e0c9a32c New entry. 
llvm-svn: 48912
 2008-03-28 07:07:06 +00:00
Evan Cheng 58db865d6e Remove duplicated entries. 
llvm-svn: 48714
 2008-03-23 22:56:07 +00:00
Christopher Lamb 8fe9109469 Fix X86's isTruncateFree to not claim that truncate to i1 is free. This fixes Bill's testcase that failed for r48491. 
llvm-svn: 48542
 2008-03-19 08:30:06 +00:00
Chris Lattner 477d0f5294 Add an issue that is preventing instcombine from doing a simplification. 
llvm-svn: 48356
 2008-03-14 06:00:19 +00:00
Chris Lattner a76e23a935 move these to the appropriate file 
llvm-svn: 48054
 2008-03-08 22:28:45 +00:00
Gabor Greif 636ab19205 some more spelling changes 
llvm-svn: 47996
 2008-03-06 10:51:21 +00:00
Chris Lattner a70df9e2ee Evan implemented these. 
llvm-svn: 47828
 2008-03-02 18:05:14 +00:00
Chris Lattner 83e80cd368 Add a random not very important note 
llvm-svn: 47704
 2008-02-28 04:52:59 +00:00
Eli Friedman 93e8b679a3 A few more small things I've run into. 
llvm-svn: 47702
 2008-02-28 00:21:43 +00:00
Evan Cheng 3d17e4c427 This is done. 
llvm-svn: 47688
 2008-02-27 20:26:32 +00:00
Eli Friedman 5d8fa828f1 A few minor updates, removing implemented stuff and adding a couple of 
new things.

llvm-svn: 47458
 2008-02-21 21:16:49 +00:00
Chris Lattner e86c91f5b2 Dan implemented one multiply issue. Replace it with another. :) 
llvm-svn: 47431
 2008-02-21 06:51:29 +00:00
Chris Lattner a827205670 Add a note about sext from i1 plus flags use. 
llvm-svn: 47278
 2008-02-18 18:30:13 +00:00
Chris Lattner 1f6520842c move PR2053 to here. 
llvm-svn: 47237
 2008-02-17 19:43:57 +00:00
Andrew Lenharth 9b254eed32 llvm.memory.barrier, and impl for x86 and alpha 
llvm-svn: 47204
 2008-02-16 01:24:58 +00:00
Chris Lattner eb63b09206 upgrade some entries, remove stuff that is done. 
llvm-svn: 47109
 2008-02-14 06:19:02 +00:00
Chris Lattner ff5998e66b add a note, remove a done deed. 
llvm-svn: 45869
 2008-01-11 18:00:13 +00:00
Arnold Schwaighofer 6cf72fbbaf Improve tail call optimized call's argument lowering. Before this 
commit all arguments where moved to the stack slot where they would
reside on a normal function call before the lowering to the tail call
stack slot. This was done to prevent arguments overwriting each other.
Now only arguments sourcing from a FORMAL_ARGUMENTS node or a
CopyFromReg node with virtual register (could also be a caller's
argument) are lowered indirectly.

 --This line, and those below, will be ignored--

M    X86/X86ISelLowering.cpp
M    X86/README.txt

llvm-svn: 45867
 2008-01-11 16:49:42 +00:00
Chris Lattner 9129f51f9b add a testcase 
llvm-svn: 45768
 2008-01-09 00:37:18 +00:00
Chris Lattner ef81aa75f6 add a note that is important for some fp apps. 
llvm-svn: 45723
 2008-01-07 21:59:58 +00:00
Chris Lattner 3b6a82118b Fold comparisons against a constant nan, and optimize ORD/UNORD 
comparisons with a constant.  This allows us to compile isnan to:

_foo:
	fcmpu cr7, f1, f1
	mfcr r2
	rlwinm r3, r2, 0, 31, 31
	blr 

instead of:

LCPI1_0:					;  float
	.space	4
_foo:
	lis r2, ha16(LCPI1_0)
	lfs f0, lo16(LCPI1_0)(r2)
	fcmpu cr7, f1, f0
	mfcr r2
	rlwinm r3, r2, 0, 31, 31
	blr 

llvm-svn: 45405
 2007-12-29 08:37:08 +00:00
Chris Lattner 33de0c6e92 this xform is implemented. 
llvm-svn: 45404
 2007-12-29 08:19:39 +00:00
Chris Lattner 8013bd339b avoid going through a stack slot to convert from fpstack to xmm reg 
if we are just going to store it back anyway.  This improves things 
like:
double foo();
void bar(double *P) { *P = foo(); }

llvm-svn: 45399
 2007-12-29 06:41:28 +00:00
Chris Lattner 62ba67c0f7 add a note 
llvm-svn: 45397
 2007-12-29 05:51:58 +00:00
Chris Lattner d798002401 add a note. 
llvm-svn: 45387
 2007-12-28 21:50:40 +00:00
Chris Lattner 6c234bf58f add a simple hack 
llvm-svn: 45343
 2007-12-24 19:27:46 +00:00
Chris Lattner 2583a66295 add an obvious load folding missed optzn. 
llvm-svn: 45161
 2007-12-18 16:48:14 +00:00
Chris Lattner ad05e17491 add a note 
llvm-svn: 44637
 2007-12-05 22:58:19 +00:00
Chris Lattner ab98c41337 add a note 
llvm-svn: 44299
 2007-11-24 06:13:33 +00:00
Chris Lattner 389d430c49 add a note 
llvm-svn: 43642
 2007-11-02 17:04:20 +00:00
Evan Cheng c826ac533b New entry. 
llvm-svn: 43420
 2007-10-28 04:01:09 +00:00
Evan Cheng 7f3d02471d Loosen up iv reuse to allow reuse of the same stride but a larger type when truncating from the larger type to smaller type is free. 
e.g.
Turns this loop:
LBB1_1: # entry.bb_crit_edge
        xorl    %ecx, %ecx
        xorw    %dx, %dx
        movw    %dx, %si
LBB1_2: # bb
        movl    L_X$non_lazy_ptr, %edi
        movw    %si, (%edi)
        movl    L_Y$non_lazy_ptr, %edi
        movw    %dx, (%edi)
		addw    $4, %dx
		incw    %si
		incl    %ecx
		cmpl    %eax, %ecx
		jne     LBB1_2  # bb
	
into

LBB1_1: # entry.bb_crit_edge
        xorl    %ecx, %ecx
        xorw    %dx, %dx
LBB1_2: # bb
        movl    L_X$non_lazy_ptr, %esi
        movw    %cx, (%esi)
        movl    L_Y$non_lazy_ptr, %esi
        movw    %dx, (%esi)
        addw    $4, %dx
		incl    %ecx
        cmpl    %eax, %ecx
        jne     LBB1_2  # bb

llvm-svn: 43375
 2007-10-26 01:56:11 +00:00
Arnold Schwaighofer 1f0da1fefb Corrected many typing errors. And removed 'nest' parameter handling 
for fastcc from X86CallingConv.td.  This means that nested functions
are not supported for calling convention 'fastcc'.

llvm-svn: 42934
 2007-10-12 21:30:57 +00:00
Evan Cheng 409fa443fc Update. 
llvm-svn: 42922
 2007-10-12 18:22:55 +00:00
Arnold Schwaighofer 9ccea99165 Added tail call optimization to the x86 back end. It can be 
enabled by passing -tailcallopt to llc.  The optimization is
performed if the following conditions are satisfied:
* caller/callee are fastcc
* elf/pic is disabled OR
  elf/pic enabled + callee is in module + callee has
  visibility protected or hidden

llvm-svn: 42870
 2007-10-11 19:40:01 +00:00
Dan Gohman 6d28778bfd This is done. 
llvm-svn: 42785
 2007-10-09 15:42:21 +00:00
Evan Cheng 42a13757de This is done. 
llvm-svn: 42656
 2007-10-05 22:34:59 +00:00
Chris Lattner 1f2b5f0e13 add a note. 
llvm-svn: 42607
 2007-10-04 15:47:27 +00:00
Chris Lattner 4bdb84fe53 add a note 
llvm-svn: 42579
 2007-10-03 17:10:03 +00:00
Chris Lattner 21ba176c4b Bill's example is still not enough to repro this, but it has other issues that 
seem significant as well.

llvm-svn: 42564
 2007-10-03 03:40:24 +00:00
Bill Wendling 3efc0758ae Another micro-opt. 
llvm-svn: 42554
 2007-10-02 21:49:31 +00:00
Bill Wendling f214ff8701 Another missed optimization with LICM. 
llvm-svn: 42552
 2007-10-02 21:43:06 +00:00
Bill Wendling 96ed3bb2d4 Now with LL code! 
llvm-svn: 42547
 2007-10-02 20:54:32 +00:00
Bill Wendling 9c4d61b523 Another missed optimization. 
llvm-svn: 42546
 2007-10-02 20:42:59 +00:00
Chris Lattner c9e7b8ec50 move PR1160 here. 
llvm-svn: 42347
 2007-09-26 06:29:31 +00:00
Evan Cheng 8c3c198499 New entry. 
llvm-svn: 41810
 2007-09-10 22:16:37 +00:00
Chris Lattner 6777b72659 Add some notes about better flag handling. 
llvm-svn: 41808
 2007-09-10 21:43:18 +00:00
Chris Lattner 33800d1428 add some notes on really poor codegen. 
llvm-svn: 41319
 2007-08-23 15:22:07 +00:00
Chris Lattner 78846b69ae add a note 
llvm-svn: 41178
 2007-08-20 02:14:33 +00:00
Chris Lattner 750b3dfcf5 expand a note 
llvm-svn: 41021
 2007-08-11 18:19:07 +00:00
Chris Lattner ee44ab5b5f With evan's explicit flag representation, hopefully we will finally be 
able to 3-addressify away stuff like this:

        movl    %ecx, %eax
        decl    %eax

llvm-svn: 41020
 2007-08-11 18:16:46 +00:00
Christopher Lamb 44e79f8aba Use subregs to improve any_extend code generation when feasible. 
llvm-svn: 41013
 2007-08-10 22:22:41 +00:00
Christopher Lamb b372abab14 Increase efficiency of sign_extend_inreg by using subregisters for truncation. As the README suggests sign_extend_subreg is selected to (sext(trunc)). 
llvm-svn: 41010
 2007-08-10 21:48:46 +00:00
Christopher Lamb f0c236fb8a Edit README in light of previous LEA16 commit. 
llvm-svn: 41009
 2007-08-10 21:29:05 +00:00
Chris Lattner 99fbf13dc3 add an observation 
llvm-svn: 40772
 2007-08-03 00:17:42 +00:00
Evan Cheng 7b5b06805a Only adjust esp around calls in presence of alloca. 
llvm-svn: 40028
 2007-07-19 00:42:05 +00:00
Evan Cheng f314055706 New entry. 
llvm-svn: 39998
 2007-07-18 08:21:49 +00:00
Evan Cheng 27ba94bf3b Update. 
llvm-svn: 39977
 2007-07-17 18:39:45 +00:00
Chris Lattner 7ea2df6e2a add a note 
llvm-svn: 37239
 2007-05-18 20:18:14 +00:00
Chris Lattner 623c738fe9 add some notes 
llvm-svn: 36965
 2007-05-10 00:08:04 +00:00
Chris Lattner be8f99ecbb move CodeGen/X86/overlap-add.ll here. 
llvm-svn: 36799
 2007-05-05 22:10:24 +00:00
Chris Lattner 62a8cbe594 SSE4 is apparently public now. 
llvm-svn: 36185
 2007-04-17 00:02:37 +00:00
Chris Lattner e275463e2f add a note 
llvm-svn: 36028
 2007-04-14 23:06:09 +00:00
Chris Lattner a6aa0319f1 done 
llvm-svn: 35884
 2007-04-11 05:34:00 +00:00
Chris Lattner d4a9b92a13 new micro optzn 
llvm-svn: 35867
 2007-04-10 21:14:01 +00:00
Chris Lattner f79fb5cad0 make a new missing features section 
llvm-svn: 35637
 2007-04-03 23:41:34 +00:00
Bill Wendling 2640b4a4ab Updated 
llvm-svn: 35634
 2007-04-03 23:37:20 +00:00
Chris Lattner 2ba38c8711 add a note 
llvm-svn: 35435
 2007-03-28 18:17:19 +00:00
Dale Johannesen a827d03154 add generation of unnecessary push/pop around calls 
llvm-svn: 35241
 2007-03-21 21:16:39 +00:00
Evan Cheng 71face25ef Notes about codegen issues. 
llvm-svn: 35107
 2007-03-14 21:03:53 +00:00
Chris Lattner fc2f52128a add a note 
llvm-svn: 34837
 2007-03-02 05:04:52 +00:00
Chris Lattner 44e9472fc6 more notes 
llvm-svn: 34204
 2007-02-12 21:20:26 +00:00
Chris Lattner b5c89c8d2d add a note 
llvm-svn: 34202
 2007-02-12 20:26:34 +00:00