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a50a554333
Commit Graph

238 Commits

Author SHA1 Message Date
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
Dan Gohman
9941a2dab3 Add a note about a potential PIC optimization. 
llvm-svn: 52663
 2008-06-24 00:53:07 +00:00
Chris Lattner
9f4f2444ea add a micro optzn. 
llvm-svn: 50681
 2008-05-05 23:19:45 +00:00
Chris Lattner
3117d33f74 Add an ugly note. 
llvm-svn: 50029
 2008-04-21 04:46:30 +00:00
Evan Cheng
3b54c5fa08 New entry. 
llvm-svn: 48912
 2008-03-28 07:07:06 +00:00
Evan Cheng
14c5714421 Remove duplicated entries. 
llvm-svn: 48714
 2008-03-23 22:56:07 +00:00
Christopher Lamb
958b0494c3 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
c60749aa4c Add an issue that is preventing instcombine from doing a simplification. 
llvm-svn: 48356
 2008-03-14 06:00:19 +00:00
Chris Lattner
b12697f8bb move these to the appropriate file 
llvm-svn: 48054
 2008-03-08 22:28:45 +00:00
Gabor Greif
92e00c1e50 some more spelling changes 
llvm-svn: 47996
 2008-03-06 10:51:21 +00:00
Chris Lattner
299977b5ca Evan implemented these. 
llvm-svn: 47828
 2008-03-02 18:05:14 +00:00
Chris Lattner
33b1f491a0 Add a random not very important note 
llvm-svn: 47704
 2008-02-28 04:52:59 +00:00
Eli Friedman
912a1d48e1 A few more small things I've run into. 
llvm-svn: 47702
 2008-02-28 00:21:43 +00:00
Evan Cheng
08f11a37d7 This is done. 
llvm-svn: 47688
 2008-02-27 20:26:32 +00:00
Eli Friedman
123fc4b97d 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
b25a98e364 Dan implemented one multiply issue. Replace it with another. :) 
llvm-svn: 47431
 2008-02-21 06:51:29 +00:00
Chris Lattner
6ab061dd2d Add a note about sext from i1 plus flags use. 
llvm-svn: 47278
 2008-02-18 18:30:13 +00:00
Chris Lattner
3e886fa85a move PR2053 to here. 
llvm-svn: 47237
 2008-02-17 19:43:57 +00:00
Andrew Lenharth
c178981b85 llvm.memory.barrier, and impl for x86 and alpha 
llvm-svn: 47204
 2008-02-16 01:24:58 +00:00
Chris Lattner
b714906acf upgrade some entries, remove stuff that is done. 
llvm-svn: 47109
 2008-02-14 06:19:02 +00:00
Chris Lattner
73e9c2c12d add a note, remove a done deed. 
llvm-svn: 45869
 2008-01-11 18:00:13 +00:00
Arnold Schwaighofer
d58f91f376 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
c465555fe6 add a testcase 
llvm-svn: 45768
 2008-01-09 00:37:18 +00:00
Chris Lattner
184daf9101 add a note that is important for some fp apps. 
llvm-svn: 45723
 2008-01-07 21:59:58 +00:00
Chris Lattner
cd147e5596 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
b36a4a7a84 this xform is implemented. 
llvm-svn: 45404
 2007-12-29 08:19:39 +00:00
Chris Lattner
e3515220d2 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
ac72965e02 add a note 
llvm-svn: 45397
 2007-12-29 05:51:58 +00:00
Chris Lattner
2248a22bda add a note. 
llvm-svn: 45387
 2007-12-28 21:50:40 +00:00
Chris Lattner
232e097cff add a simple hack 
llvm-svn: 45343
 2007-12-24 19:27:46 +00:00
Chris Lattner
93d750bbe3 add an obvious load folding missed optzn. 
llvm-svn: 45161
 2007-12-18 16:48:14 +00:00
Chris Lattner
011d2aab51 add a note 
llvm-svn: 44637
 2007-12-05 22:58:19 +00:00
Chris Lattner
9020367ea0 add a note 
llvm-svn: 44299
 2007-11-24 06:13:33 +00:00
Chris Lattner
679e22d547 add a note 
llvm-svn: 43642
 2007-11-02 17:04:20 +00:00
Evan Cheng
053178440a New entry. 
llvm-svn: 43420
 2007-10-28 04:01:09 +00:00
Evan Cheng
53696b7e9f 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
6bcd9e7ec2 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
c36fdf163a Update. 
llvm-svn: 42922
 2007-10-12 18:22:55 +00:00
Arnold Schwaighofer
d47210011e 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
9546d48e97 This is done. 
llvm-svn: 42785
 2007-10-09 15:42:21 +00:00
Evan Cheng
e0e36e4a0e This is done. 
llvm-svn: 42656
 2007-10-05 22:34:59 +00:00
Chris Lattner
4224151a44 add a note. 
llvm-svn: 42607
 2007-10-04 15:47:27 +00:00
Chris Lattner
a31fa80185 add a note 
llvm-svn: 42579
 2007-10-03 17:10:03 +00:00