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71 Commits

Author SHA1 Message Date
Chris Lattner
eb4c7e43cc we should pattern match the SSE complex arithmetic ops. 
llvm-svn: 112109
 2010-08-25 23:31:42 +00:00
Chris Lattner
f4dfc7aaab random improvement for variable shift codegen. 
llvm-svn: 111813
 2010-08-23 17:30:29 +00:00
Jakob Stoklund Olesen
eeabe43059 Remove obsolete README_SSE note. 
We are generating movaps for all XMM register copies, including scalar
floating point values. This is known to be at least as good as movss and movsd
for all known architectures up to and including Nehalem because it avoids a
partial register stall.

The SSEDomainFix pass will switch movaps to movdqa when appropriate (i.e., when
operands come from the integer unit). We don't now that switching movaps to
movapd has any benefit.

The same applies to andps -> pand.

llvm-svn: 108096
 2010-07-11 17:13:42 +00:00
Chris Lattner
6a9b6e3253 some notes about suboptimal insertps's 
llvm-svn: 107613
 2010-07-05 05:48:41 +00:00
Eli Friedman
37ee2be8cc Remove some already-fixed README entries. 
llvm-svn: 105377
 2010-06-03 01:47:31 +00:00
Eli Friedman
6a9bddea09 Remove README entry which no longer compiles to something sane. 
llvm-svn: 105376
 2010-06-03 01:16:51 +00:00
Dan Gohman
37bf232609 Floating-point add, sub, and mul are now spelled fadd, fsub, and fmul, 
respectively.

llvm-svn: 97531
 2010-03-02 01:11:08 +00:00
Dan Gohman
92b6122204 Fix "the the" and similar typos. 
llvm-svn: 95781
 2010-02-10 16:03:48 +00:00
Chris Lattner
7c64c9ca21 add a note from PR6194 
llvm-svn: 95649
 2010-02-09 05:45:29 +00:00
Chris Lattner
a635219775 move the PR6214 microoptzn to this file. 
llvm-svn: 95299
 2010-02-04 07:32:01 +00:00
Chris Lattner
72a06499b3 this is an SSE-specific issue. 
llvm-svn: 93373
 2010-01-13 23:29:11 +00:00
Chris Lattner
feb6b56242 Bill implemented this. 
llvm-svn: 63752
 2009-02-04 19:09:07 +00:00
Chris Lattner
eae4653469 add a note, this is why we're faster at SciMark-MonteCarlo with 
SSE disabled.

llvm-svn: 63751
 2009-02-04 19:08:01 +00:00
Evan Cheng
2a965124b7 The memory alignment requirement on some of the mov{h|l}p{d|s} patterns are 16-byte. That is overly strict. These instructions read / write f64 memory locations without alignment requirement. 
llvm-svn: 63195
 2009-01-28 08:35:02 +00:00
Chris Lattner
c018045520 add a note 
llvm-svn: 56391
 2008-09-20 19:17:53 +00:00
Chris Lattner
61e771be29 add a note 
llvm-svn: 54964
 2008-08-19 00:41:02 +00:00
Evan Cheng
71fbfe73c1 - Fix a x86 vector isel bug: illegal transformation of a vector_shuffle into a 
shift.
- Add a readme entry for a missing vector_shuffle optimization that results in
  awful codegen.

llvm-svn: 52740
 2008-06-25 20:52:59 +00:00
Evan Cheng
d312ced1cf This is done. 
llvm-svn: 51526
 2008-05-24 00:10:13 +00:00
Evan Cheng
4f660778f0 Use movlps / movhps to modify low / high half of 16-byet memory location. 
llvm-svn: 51501
 2008-05-23 21:23:16 +00:00
Dan Gohman
e8422fc112 Elaborate on the entry on integer vector multiplication by constants. 
llvm-svn: 51491
 2008-05-23 18:05:39 +00:00
Evan Cheng
e7ec4690e1 New entry. 
llvm-svn: 51487
 2008-05-23 17:28:11 +00:00
Chris Lattner
4c1ffef5af we compile multiply-by-constant into horrible code. Doesn't sse4 have some 
instruction for doing this?

llvm-svn: 51473
 2008-05-23 04:29:53 +00:00
Chris Lattner
a11adf725d add a note 
llvm-svn: 51062
 2008-05-13 19:56:20 +00:00
Chris Lattner
c9eb6a7d64 add a note 
llvm-svn: 51060
 2008-05-13 18:48:54 +00:00
Evan Cheng
9e15622879 Instead of a vector load, shuffle and then extract an element. Load the element from address with an offset. 
pshufd $1, (%rdi), %xmm0
        movd %xmm0, %eax
=>
        movl 4(%rdi), %eax

llvm-svn: 51026
 2008-05-13 08:35:03 +00:00
Evan Cheng
e4ee4c2870 On x86, it's safe to treat i32 load anyext as a normal i32 load. Ditto for i8 anyext load to i16. 
llvm-svn: 51019
 2008-05-13 00:54:02 +00:00
Evan Cheng
fcbdc8bd6e Xform bitconvert(build_pair(load a, load b)) to a single load if the load locations are at the right offset from each other. 
llvm-svn: 51008
 2008-05-12 23:04:07 +00:00
Anton Korobeynikov
ad83aeb489 Add note 
llvm-svn: 50959
 2008-05-11 14:33:15 +00:00
Chris Lattner
9f994482f5 add a note, this is actually not too bad to implement. 
llvm-svn: 49466
 2008-04-10 05:54:50 +00:00
Chris Lattner
869325c4c4 move the x86-32 part of PR2108 here. 
llvm-svn: 49465
 2008-04-10 05:37:47 +00:00
Chris Lattner
b628208161 Finish implementing a readme entry: when inserting an i64 variable 
into a vector of zeros or undef, and when the top part is obviously
zero, we can just use movd + shuffle.  This allows us to compile
vec_set-B.ll into:

_test3:
	movl	$1234567, %eax
	andl	4(%esp), %eax
	movd	%eax, %xmm0
	ret

instead of:

_test3:
	subl	$28, %esp
	movl	$1234567, %eax
	andl	32(%esp), %eax
	movl	%eax, (%esp)
	movl	$0, 4(%esp)
	movq	(%esp), %xmm0
	addl	$28, %esp
	ret

llvm-svn: 48090
 2008-03-09 05:42:06 +00:00
Chris Lattner
b741ebba29 add a note 
llvm-svn: 48064
 2008-03-09 01:08:22 +00:00
Chris Lattner
17f68a3075 Implement a readme entry, compiling 
#include <xmmintrin.h>
__m128i doload64(short x) {return _mm_set_epi16(0,0,0,0,0,0,0,1);}

into:
	movl	$1, %eax
	movd	%eax, %xmm0
	ret

instead of a constant pool load.

llvm-svn: 48063
 2008-03-09 01:05:04 +00:00
Chris Lattner
ff9dc0af80 This one looks easy, add a note. 
llvm-svn: 48055
 2008-03-08 22:32:39 +00:00
Chris Lattner
b12697f8bb move these to the appropriate file 
llvm-svn: 48054
 2008-03-08 22:28:45 +00:00
Chris Lattner
83e0b885f8 evan implemented this. 
llvm-svn: 47948
 2008-03-05 17:11:51 +00:00
Chris Lattner
7571a88209 add a note 
llvm-svn: 47939
 2008-03-05 07:22:39 +00:00
Chris Lattner
299977b5ca Evan implemented these. 
llvm-svn: 47828
 2008-03-02 18:05:14 +00:00
Chris Lattner
b714906acf upgrade some entries, remove stuff that is done. 
llvm-svn: 47109
 2008-02-14 06:19:02 +00:00
Nate Begeman
5f18794295 readme updates 
llvm-svn: 47051
 2008-02-13 07:06:12 +00:00
Nate Begeman
5a4e290b70 Enable SSE4 codegen and pattern matching. 
Add some notes to the README.

llvm-svn: 46949
 2008-02-11 04:19:36 +00:00
Chris Lattner
39c52e030b add a note 
llvm-svn: 46413
 2008-01-27 07:31:41 +00:00
Chris Lattner
00183edf55 Add some notes. 
llvm-svn: 46405
 2008-01-26 20:12:07 +00:00
Chris Lattner
d55e743cfe One readme entry is done, one is really easy (Evan, want to investigate 
eliminating the llvm.x86.sse2.loadl.pd intrinsic?), one shuffle optzn
may be done (if shufps is better than pinsw, Evan, please review), and
we already know about LICM of simple instructions.

llvm-svn: 45407
 2007-12-29 19:31:47 +00:00
Evan Cheng
a111629401 New entry. 
llvm-svn: 45280
 2007-12-21 01:31:58 +00:00
Chris Lattner
be8379fac5 add a note. 
llvm-svn: 43444
 2007-10-29 06:19:48 +00:00
Bill Wendling
36f033e53e Small label changes. 
llvm-svn: 42549
 2007-10-02 21:02:53 +00:00
Bill Wendling
a7d5c36215 Now with source code. 
llvm-svn: 42548
 2007-10-02 21:01:16 +00:00
Bill Wendling
5e50716a6b Micro-optimization -- missed LICM opportunity. 
llvm-svn: 42542
 2007-10-02 19:55:05 +00:00
Chris Lattner
2efd3899f2 move PR1264 here. 
llvm-svn: 42345
 2007-09-26 06:15:48 +00:00