Evan Cheng
1632782fe9
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.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63195 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-28 08:35:02 +00:00
Chris Lattner
e306b3d0d9
add a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56391 91177308-0d34-0410-b5e6-96231b3b80d8
2008-09-20 19:17:53 +00:00
Chris Lattner
fa7e17d379
add a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54964 91177308-0d34-0410-b5e6-96231b3b80d8
2008-08-19 00:41:02 +00:00
Evan Cheng
ab26227c8c
- Fix a x86 vector isel bug: illegal transformation of a vector_shuffle into a
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shift.
- Add a readme entry for a missing vector_shuffle optimization that results in
awful codegen.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52740 91177308-0d34-0410-b5e6-96231b3b80d8
2008-06-25 20:52:59 +00:00
Evan Cheng
fe5b159ae2
This is done.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51526 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-24 00:10:13 +00:00
Evan Cheng
cd0baf21a1
Use movlps / movhps to modify low / high half of 16-byet memory location.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51501 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-23 21:23:16 +00:00
Dan Gohman
a9e75631a7
Elaborate on the entry on integer vector multiplication by constants.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51491 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-23 18:05:39 +00:00
Evan Cheng
d4083d01d2
New entry.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51487 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-23 17:28:11 +00:00
Chris Lattner
3adaa93700
we compile multiply-by-constant into horrible code. Doesn't sse4 have some
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instruction for doing this?
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51473 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-23 04:29:53 +00:00
Chris Lattner
3b34e1e9e8
add a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51062 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-13 19:56:20 +00:00
Chris Lattner
7171c836a9
add a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51060 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-13 18:48:54 +00:00
Evan Cheng
77f0b7a50a
Instead of a vector load, shuffle and then extract an element. Load the element from address with an offset.
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pshufd $1, (%rdi), %xmm0
movd %xmm0, %eax
=>
movl 4(%rdi), %eax
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51026 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-13 08:35:03 +00:00
Evan Cheng
fa7fd33a26
On x86, it's safe to treat i32 load anyext as a normal i32 load. Ditto for i8 anyext load to i16.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51019 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-13 00:54:02 +00:00
Evan Cheng
9bfa03c6fd
Xform bitconvert(build_pair(load a, load b)) to a single load if the load locations are at the right offset from each other.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51008 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-12 23:04:07 +00:00
Anton Korobeynikov
64d69102a1
Add note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50959 91177308-0d34-0410-b5e6-96231b3b80d8
2008-05-11 14:33:15 +00:00
Chris Lattner
2189c17443
add a note, this is actually not too bad to implement.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49466 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-10 05:54:50 +00:00
Chris Lattner
a825d75f1d
move the x86-32 part of PR2108 here.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49465 91177308-0d34-0410-b5e6-96231b3b80d8
2008-04-10 05:37:47 +00:00
Chris Lattner
67f453aae7
Finish implementing a readme entry: when inserting an i64 variable
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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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48090 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-09 05:42:06 +00:00
Chris Lattner
f68cbceb17
add a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48064 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-09 01:08:22 +00:00
Chris Lattner
62098040a1
Implement a readme entry, compiling
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#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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48063 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-09 01:05:04 +00:00
Chris Lattner
b607f9c822
This one looks easy, add a note.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48055 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-08 22:32:39 +00:00
Chris Lattner
f658ad10f6
move these to the appropriate file
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48054 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-08 22:28:45 +00:00
Chris Lattner
4d93b2f16d
evan implemented this.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47948 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-05 17:11:51 +00:00
Chris Lattner
063d825208
add a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47939 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-05 07:22:39 +00:00
Chris Lattner
767486b1d5
Evan implemented these.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47828 91177308-0d34-0410-b5e6-96231b3b80d8
2008-03-02 18:05:14 +00:00
Chris Lattner
eb05f90c71
upgrade some entries, remove stuff that is done.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47109 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-14 06:19:02 +00:00
Nate Begeman
b5041b3085
readme updates
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47051 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-13 07:06:12 +00:00
Nate Begeman
14d12caf1d
Enable SSE4 codegen and pattern matching.
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Add some notes to the README.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46949 91177308-0d34-0410-b5e6-96231b3b80d8
2008-02-11 04:19:36 +00:00
Chris Lattner
f6b935d8e6
add a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46413 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-27 07:31:41 +00:00
Chris Lattner
4d53049c92
Add some notes.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46405 91177308-0d34-0410-b5e6-96231b3b80d8
2008-01-26 20:12:07 +00:00
Chris Lattner
03c079d5fc
One readme entry is done, one is really easy (Evan, want to investigate
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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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45407 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-29 19:31:47 +00:00
Evan Cheng
0b0102b172
New entry.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45280 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-21 01:31:58 +00:00
Chris Lattner
dc4756bfda
add a note.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43444 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-29 06:19:48 +00:00
Bill Wendling
892d392905
Small label changes.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42549 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-02 21:02:53 +00:00
Bill Wendling
6dbb1b59ae
Now with source code.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42548 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-02 21:01:16 +00:00
Bill Wendling
c720279ac7
Micro-optimization -- missed LICM opportunity.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42542 91177308-0d34-0410-b5e6-96231b3b80d8
2007-10-02 19:55:05 +00:00
Chris Lattner
61001b8bd4
move PR1264 here.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42345 91177308-0d34-0410-b5e6-96231b3b80d8
2007-09-26 06:15:48 +00:00
Chris Lattner
b23f4c5f44
add a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41359 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-24 15:17:59 +00:00
Chris Lattner
d42b8be3da
add a note.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41103 91177308-0d34-0410-b5e6-96231b3b80d8
2007-08-15 16:58:38 +00:00
Chris Lattner
ca23e17adf
another missed SSE optimization
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@39772 91177308-0d34-0410-b5e6-96231b3b80d8
2007-07-12 06:31:38 +00:00
Chris Lattner
36c5155d0f
add a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@38507 91177308-0d34-0410-b5e6-96231b3b80d8
2007-07-10 20:03:50 +00:00
Bill Wendling
03179060ee
Made this into a bug report: PR1286
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35439 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-28 19:07:34 +00:00
Bill Wendling
a348c56fde
Support added for shifts and unpacking MMX instructions.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35266 91177308-0d34-0410-b5e6-96231b3b80d8
2007-03-22 18:42:45 +00:00
Chris Lattner
dbec2d9dcf
a note
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34670 91177308-0d34-0410-b5e6-96231b3b80d8
2007-02-27 17:21:09 +00:00
Evan Cheng
0e51207959
This is done.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32591 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-15 05:50:39 +00:00
Evan Cheng
e89546eb7d
This is done.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32584 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-14 19:45:32 +00:00
Evan Cheng
133b1dd8ad
Add note.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32561 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-13 20:59:43 +00:00
Chris Lattner
b4115ac8f3
this is done
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32424 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-11 01:01:03 +00:00
Chris Lattner
2beb136e0b
Add a perf optzn corresponding to PR1033.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32229 91177308-0d34-0410-b5e6-96231b3b80d8
2006-12-05 18:25:10 +00:00
Evan Cheng
484c7a1295
Add a note.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31650 91177308-0d34-0410-b5e6-96231b3b80d8
2006-11-10 22:09:17 +00:00