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57 Commits

Author SHA1 Message Date
Jim Grosbach
b9fd88619e ARM: Add test cleanup entry to the README. 
llvm-svn: 159864
 2012-07-06 21:52:04 +00:00
Jakob Stoklund Olesen
0419ed395c Implement ARMBaseInstrInfo::commuteInstruction() for MOVCCr. 
A MOVCCr instruction can be commuted by inverting the condition. This
can help reduce register pressure and remove unnecessary copies in some
cases.

<rdar://problem/11182914>

llvm-svn: 154033
 2012-04-04 18:23:42 +00:00
Bob Wilson
157561c941 Add a note about a potential optimization for clz/ctz patterns for ARM 
(and other targets).

llvm-svn: 149182
 2012-01-28 18:30:07 +00:00
Evan Cheng
ddc415a907 Add an entry. 
llvm-svn: 135024
 2011-07-13 01:33:00 +00:00
Bob Wilson
72ccdfe148 Add a readme entry for the redundant movw issue for pr9370. 
llvm-svn: 126930
 2011-03-03 06:39:09 +00:00
Eli Friedman
94c9f00dd6 And a bit more non-ASCII stuff. 
llvm-svn: 109458
 2010-07-26 22:28:18 +00:00
Anton Korobeynikov
b71ee4ebbb Drop some non-ascii stuff 
llvm-svn: 109456
 2010-07-26 22:23:07 +00:00
Anton Korobeynikov
5e1e95aed9 Add a note 
llvm-svn: 109448
 2010-07-26 21:48:35 +00:00
Jim Grosbach
270540da7b Add combiner patterns to more effectively utilize the BFI (bitfield insert) 
instruction for non-constant operands. This includes the case referenced
in the README.txt regarding a bitfield copy.

llvm-svn: 108608
 2010-07-17 03:30:54 +00:00
Eli Friedman
fc1680a9af Random note about bswap. 
llvm-svn: 108396
 2010-07-15 02:20:38 +00:00
Eli Friedman
7175d7558d A couple potential optimizations inspired by comment 4 in PR6773. 
llvm-svn: 108328
 2010-07-14 06:58:26 +00:00
Chris Lattner
6a8b488d78 add a note. 
llvm-svn: 99815
 2010-03-29 17:02:02 +00:00
Chris Lattner
f95f8a8c7c add a note, from PR5100 
llvm-svn: 96490
 2010-02-17 18:42:24 +00:00
Chris Lattner
1492d5c447 this is done, tested by CodeGen/ARM/iabs.ll 
llvm-svn: 95609
 2010-02-08 23:48:10 +00:00
Jim Grosbach
231a0d01a9 Fix PR5694. The CMN instructions set the flags differently from CMP, so they 
cannot be directly interchanged for comparisons against negated values.
Disable the CMN instructions for the time being.

llvm-svn: 94119
 2010-01-22 00:08:13 +00:00
Jim Grosbach
ea6c9c17f5 Use Unified Assembly Syntax for the ARM backend. 
llvm-svn: 86494
 2009-11-09 00:11:35 +00:00
Evan Cheng
899d8cb6a0 Refactor code. Fix a potential missing check. Teach isIdentical() about tLDRpci_pic. 
llvm-svn: 86330
 2009-11-07 04:04:34 +00:00
Evan Cheng
e79ff8a615 These are done / no longer care. 
llvm-svn: 85798
 2009-11-02 07:58:25 +00:00
Evan Cheng
532dfd431f Add an entry. 
llvm-svn: 85797
 2009-11-02 07:51:19 +00:00
Bob Wilson
1c2cbe3945 Add a note about Robert Muth's alternate jump table implementation. 
llvm-svn: 85624
 2009-10-30 22:22:46 +00:00
Evan Cheng
54a1a87862 Make ARM and Thumb2 32-bit immediate materialization into a single 32-bit pseudo 
instruction. This makes it re-materializable.

Thumb2 will split it back out into two instructions so IT pass will generate the
right mask. Also, this expose opportunies to optimize the movw to a 16-bit move.

llvm-svn: 82982
 2009-09-28 09:14:39 +00:00
Chris Lattner
edb8650e80 add a random codegen deficiency. 
llvm-svn: 77598
 2009-07-30 16:08:58 +00:00
Evan Cheng
597bf41097 Disable my constant island pass optimization (to make use soimm more effectively). It caused infinite looping on lencod. 
llvm-svn: 76995
 2009-07-24 19:31:03 +00:00
Evan Cheng
f0af946ac8 Add an entry. 
llvm-svn: 76711
 2009-07-22 00:58:27 +00:00
Evan Cheng
093adf3ff9 Implement Thumb2 ldr. 
After much back and forth, I decided to deviate from ARM design and split LDR into 4 instructions (r + imm12, r + imm8, r + r << imm12, constantpool). The advantage of this is 1) it follows the latest ARM technical manual, and 2) makes it easier to reduce the width of the instruction later. The down side is this creates more inconsistency between the two sub-targets. We should split ARM LDR instruction in a similar fashion later. I've added a README entry for this.

llvm-svn: 74420
 2009-06-29 07:51:04 +00:00
Evan Cheng
2eb1525e2a Add a note about commuting conditional move. 
llvm-svn: 74241
 2009-06-26 00:28:48 +00:00
Evan Cheng
f23c8a5c8a These are done / no longer applicable. 
llvm-svn: 74239
 2009-06-26 00:25:27 +00:00
Bob Wilson
6db76aaf10 Add support for ARM's Advanced SIMD (NEON) instruction set. 
This is still a work in progress but most of the NEON instruction set
is supported.

llvm-svn: 73919
 2009-06-22 23:27:02 +00:00
Chris Lattner
706eb604ae several entries got significantly better, though they still aren't done. 
llvm-svn: 44382
 2007-11-27 22:41:52 +00:00
Chris Lattner
d2ee2dad04 implement a trivial readme entry. 
llvm-svn: 44380
 2007-11-27 22:36:16 +00:00
Chris Lattner
57e2fa4ba0 Add an easy microoptimization I noticed. 
llvm-svn: 43164
 2007-10-19 03:29:26 +00:00
Chris Lattner
d4602cc0e7 Add some notes about better flag handling. 
llvm-svn: 41808
 2007-09-10 21:43:18 +00:00
Evan Cheng
05c784cc30 Update. 
llvm-svn: 38513
 2007-07-10 21:49:47 +00:00
Dale Johannesen
d6f582af9d Remove item: thumb padding in constant islands 
llvm-svn: 36586
 2007-04-30 00:32:06 +00:00
Chris Lattner
f7ac47b4e2 add a crazy idea 
llvm-svn: 36273
 2007-04-20 20:18:43 +00:00
Chris Lattner
af5c203dbd add a note 
llvm-svn: 36203
 2007-04-17 18:03:00 +00:00
Evan Cheng
fb9c4c2edc Updated. 
llvm-svn: 35229
 2007-03-20 22:32:39 +00:00
Evan Cheng
a4e410aa9c Minor stuff. 
llvm-svn: 35049
 2007-03-09 19:46:06 +00:00
Evan Cheng
d7201d12af Add comments about LSR / ARM. 
llvm-svn: 35048
 2007-03-09 19:35:33 +00:00
Evan Cheng
2e6f19d8c8 Unfinished work and ideas related to register scavenger. 
llvm-svn: 35047
 2007-03-09 19:34:51 +00:00
Dale Johannesen
10a05b538d apply comments from review of last patch 
llvm-svn: 35045
 2007-03-09 19:18:59 +00:00
Dale Johannesen
23c2498e23 Add some observations from CoreGraphics benchmark. Remove register 
scavenging todo item, since it is now implemented.

llvm-svn: 35044
 2007-03-09 17:58:17 +00:00
Dale Johannesen
5ec68034ee Add intelligence about where to break large blocks. 
llvm-svn: 34755
 2007-02-28 18:41:23 +00:00
Dale Johannesen
f6f34ec2e0 cosmetic changes from review of last patch. obvious 
llvm-svn: 34598
 2007-02-25 18:31:31 +00:00
Dale Johannesen
ccecc12da5 Removed WaterListOffset, inserted BBOffsets. Remove TODO item about this 
from README.
When no water available, use end of block if in range.  (More to do here.)

llvm-svn: 34563
 2007-02-25 00:47:03 +00:00
Dale Johannesen
544968d665 rewrite of constant islands 
llvm-svn: 34523
 2007-02-23 05:02:36 +00:00
Chris Lattner
63479262b4 add a note 
llvm-svn: 33778
 2007-02-02 04:36:46 +00:00
Evan Cheng
c6e1d453d3 ARM backend contribution from Apple. 
llvm-svn: 33353
 2007-01-19 07:51:42 +00:00
Rafael Espindola
e3aafd29a9 add note 
llvm-svn: 32452
 2006-12-11 23:56:10 +00:00
Rafael Espindola
31f59f5b94 add FSTD and FSTS 
llvm-svn: 30996
 2006-10-17 13:36:07 +00:00