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Author SHA1 Message Date
Chris Lattner f076d5eea8 add a note 
llvm-svn: 54964
 2008-08-19 00:41:02 +00:00
Evan Cheng 3fc2372d3a - 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 8647b875cc This is done. 
llvm-svn: 51526
 2008-05-24 00:10:13 +00:00
Evan Cheng 04d24edcbb 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 66eea1b9b3 Elaborate on the entry on integer vector multiplication by constants. 
llvm-svn: 51491
 2008-05-23 18:05:39 +00:00
Evan Cheng d25cb8e0d2 New entry. 
llvm-svn: 51487
 2008-05-23 17:28:11 +00:00
Chris Lattner 3546c2b4e4 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 03ce206143 add a note 
llvm-svn: 51062
 2008-05-13 19:56:20 +00:00
Chris Lattner d17f58ae6e add a note 
llvm-svn: 51060
 2008-05-13 18:48:54 +00:00
Evan Cheng 1120279ae6 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 3f40c69083 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 b980f6fb3d 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 a38e72d247 Add note 
llvm-svn: 50959
 2008-05-11 14:33:15 +00:00
Chris Lattner aeb23a8a34 add a note, this is actually not too bad to implement. 
llvm-svn: 49466
 2008-04-10 05:54:50 +00:00
Chris Lattner c692188075 move the x86-32 part of PR2108 here. 
llvm-svn: 49465
 2008-04-10 05:37:47 +00:00
Chris Lattner b6387c8a74 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 93930dc28c add a note 
llvm-svn: 48064
 2008-03-09 01:08:22 +00:00
Chris Lattner eef374c197 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 35adf46967 This one looks easy, add a note. 
llvm-svn: 48055
 2008-03-08 22:32:39 +00:00
Chris Lattner a76e23a935 move these to the appropriate file 
llvm-svn: 48054
 2008-03-08 22:28:45 +00:00
Chris Lattner 7c08a01698 evan implemented this. 
llvm-svn: 47948
 2008-03-05 17:11:51 +00:00
Chris Lattner 2acd0c25f6 add a note 
llvm-svn: 47939
 2008-03-05 07:22:39 +00:00
Chris Lattner a70df9e2ee Evan implemented these. 
llvm-svn: 47828
 2008-03-02 18:05:14 +00:00
Chris Lattner eb63b09206 upgrade some entries, remove stuff that is done. 
llvm-svn: 47109
 2008-02-14 06:19:02 +00:00
Nate Begeman eea32990a9 readme updates 
llvm-svn: 47051
 2008-02-13 07:06:12 +00:00
Nate Begeman 2d77e8e446 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 2e4719ec55 add a note 
llvm-svn: 46413
 2008-01-27 07:31:41 +00:00
Chris Lattner 2dd23b9f32 Add some notes. 
llvm-svn: 46405
 2008-01-26 20:12:07 +00:00
Chris Lattner d2b8a36f0e 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 78c460c8c4 New entry. 
llvm-svn: 45280
 2007-12-21 01:31:58 +00:00
Chris Lattner 909a54ccd4 add a note. 
llvm-svn: 43444
 2007-10-29 06:19:48 +00:00
Bill Wendling 855011e5c6 Small label changes. 
llvm-svn: 42549
 2007-10-02 21:02:53 +00:00
Bill Wendling 4eb7ca4b4c Now with source code. 
llvm-svn: 42548
 2007-10-02 21:01:16 +00:00
Bill Wendling 88ea107fdb Micro-optimization -- missed LICM opportunity. 
llvm-svn: 42542
 2007-10-02 19:55:05 +00:00
Chris Lattner fef69f5b4a move PR1264 here. 
llvm-svn: 42345
 2007-09-26 06:15:48 +00:00
Chris Lattner 51883acec1 add a note 
llvm-svn: 41359
 2007-08-24 15:17:59 +00:00
Chris Lattner db8adb9941 add a note. 
llvm-svn: 41103
 2007-08-15 16:58:38 +00:00
Chris Lattner bdc69595d9 another missed SSE optimization 
llvm-svn: 39772
 2007-07-12 06:31:38 +00:00
Chris Lattner f51bd666d9 add a note 
llvm-svn: 38507
 2007-07-10 20:03:50 +00:00
Bill Wendling 4ad38abd40 Made this into a bug report: PR1286 
llvm-svn: 35439
 2007-03-28 19:07:34 +00:00
Bill Wendling d551a18783 Support added for shifts and unpacking MMX instructions. 
llvm-svn: 35266
 2007-03-22 18:42:45 +00:00
Chris Lattner 2ebb2e99d1 a note 
llvm-svn: 34670
 2007-02-27 17:21:09 +00:00
Evan Cheng 2455e6937b This is done. 
llvm-svn: 32591
 2006-12-15 05:50:39 +00:00
Evan Cheng ac1fa442a7 This is done. 
llvm-svn: 32584
 2006-12-14 19:45:32 +00:00
Evan Cheng 9ffa6a60ed Add note. 
llvm-svn: 32561
 2006-12-13 20:59:43 +00:00
Chris Lattner 6727f2a5f9 this is done 
llvm-svn: 32424
 2006-12-11 01:01:03 +00:00
Chris Lattner 57a41985e3 Add a perf optzn corresponding to PR1033. 
llvm-svn: 32229
 2006-12-05 18:25:10 +00:00
Evan Cheng 915026cdc3 Add a note. 
llvm-svn: 31650
 2006-11-10 22:09:17 +00:00
Evan Cheng 5b725a71a9 These are done. 
llvm-svn: 31649
 2006-11-10 22:03:35 +00:00
Chris Lattner 35a1471046 add a note 
llvm-svn: 31038
 2006-10-18 17:04:09 +00:00