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74 Commits

Author SHA1 Message Date
Chris Lattner 1d07b65add add a note 
llvm-svn: 45837
 2008-01-10 18:25:41 +00:00
Chris Lattner 45e5032b1d add a note 
llvm-svn: 45766
 2008-01-09 00:17:57 +00:00
Chris Lattner 730d088be1 possible switch lowering improvement. 
llvm-svn: 45720
 2008-01-07 21:38:14 +00:00
Chris Lattner d7857eafd0 add a note 
llvm-svn: 45698
 2008-01-07 07:46:23 +00:00
Chris Lattner 4e6cbb2fe2 this is done. 
llvm-svn: 45408
 2007-12-29 19:38:02 +00:00
Chris Lattner 7cafd92aa9 expand note. 
llvm-svn: 45393
 2007-12-29 01:05:01 +00:00
Chris Lattner 9d53b611d1 add a note. 
llvm-svn: 45388
 2007-12-28 22:30:05 +00:00
Chris Lattner 180f0e9044 add a note 
llvm-svn: 45377
 2007-12-28 04:42:05 +00:00
Christopher Lamb 8b09a464b4 Fold certain additions through selects (and their compares) so as to eliminate subtractions. This code is often produced by the SMAX expansion in SCEV. 
This implements test/Transforms/InstCombine/2007-12-18-AddSelCmpSub.ll

llvm-svn: 45158
 2007-12-18 09:34:41 +00:00
Chris Lattner 52a9e40789 add a missed case. 
llvm-svn: 45141
 2007-12-18 01:19:18 +00:00
Chris Lattner 7c709a5d08 implement a readme entry, compiling the code into: 
_foo:
	movl	$12, %eax
	andl	4(%esp), %eax
	movl	_array(%eax), %eax
	ret

instead of:

_foo:
	movl	4(%esp), %eax
	shrl	$2, %eax
	andl	$3, %eax
	movl	_array(,%eax,4), %eax
	ret

As it turns out, this triggers all the time, in a wide variety of
situations, for example, I see diffs like this in various programs:

-       movl    8(%eax), %eax
-       shll    $2, %eax
-       andl    $1020, %eax
-       movl    (%esi,%eax), %eax
+       movzbl  8(%eax), %eax
+       movl    (%esi,%eax,4), %eax


-       shll    $2, %edx
-       andl    $1020, %edx
-       movl    (%edi,%edx), %edx
+       andl    $255, %edx
+       movl    (%edi,%edx,4), %edx

Unfortunately, I also see stuff like this, which can be fixed in the
X86 backend:

-       andl    $85, %ebx
-       addl    _bit_count(,%ebx,4), %ebp
+       shll    $2, %ebx
+       andl    $340, %ebx
+       addl    _bit_count(%ebx), %ebp

llvm-svn: 44656
 2007-12-06 07:33:36 +00:00
Chris Lattner 5e224c32f4 add a note 
llvm-svn: 44638
 2007-12-05 23:05:06 +00:00
Chris Lattner 4d4e9cdb62 add a note 
llvm-svn: 42573
 2007-10-03 06:10:59 +00:00
Chris Lattner 9958b82733 add a note 
llvm-svn: 36811
 2007-05-05 22:44:08 +00:00
Chris Lattner 2cca31f77f the mason example is implemented. Move some examples out of llvm/test, 
upgrade the syntax of some other examples.

llvm-svn: 36806
 2007-05-05 22:29:06 +00:00
Chris Lattner 43cab75914 add a bad case evan though of. 
llvm-svn: 35296
 2007-03-24 06:01:32 +00:00
Chris Lattner 9b3e2b4ad9 minor updates 
llvm-svn: 35143
 2007-03-18 22:41:33 +00:00
Nick Lewycky f764441977 This is implemented. We now generate: 
entry:
        icmp ugt i32 %x, 4              ; <i1>:0 [#uses=1]
        br i1 %0, label %cond_true, label %cond_false

cond_true:              ; preds = %entry
        %tmp1 = tail call i32 (...)* @bar( i32 12 )             ; <i32> [#uses=0]
        ret void

cond_false:             ; preds = %entry
        switch i32 %x, label %cond_true15 [
                 i32 4, label %cond_true3
                 i32 3, label %cond_true7
                 i32 2, label %cond_true11
                 i32 0, label %cond_false17
        ]

...

llvm-svn: 35142
 2007-03-18 14:37:20 +00:00
Reid Spencer 09575bac2e For PR1195: 
Change use of "packed" term to "vector" in comments, strings, variable
names, etc.

llvm-svn: 34300
 2007-02-15 03:39:18 +00:00
Chris Lattner 09a32e42bd add a note 
llvm-svn: 34249
 2007-02-13 21:44:43 +00:00
Chris Lattner 89e5813312 add a note: we need whole-function selectiondags :) 
llvm-svn: 33252
 2007-01-16 06:39:48 +00:00
Reid Spencer 266e42b312 For PR950: 
This patch removes the SetCC instructions and replaces them with the ICmp
and FCmp instructions. The SetCondInst instruction has been removed and
been replaced with ICmpInst and FCmpInst.

llvm-svn: 32751
 2006-12-23 06:05:41 +00:00
Chris Lattner feeb9c7be5 Evan implemented the machineinstr improvements. 
The rot example works if the type is cast to ubyte.

Move sroa examples together and upgrade them to HEAD syntax.

llvm-svn: 32423
 2006-12-11 00:44:03 +00:00
Chris Lattner 4d475f6e6e add a note 
llvm-svn: 32347
 2006-12-08 02:01:32 +00:00
Chris Lattner 0d67dde00a done 
llvm-svn: 32013
 2006-11-29 07:21:46 +00:00
Chris Lattner 6dc22332bf add a note 
llvm-svn: 31719
 2006-11-14 01:57:53 +00:00
Nick Lewycky 0df2ada9d4 Cute example from Chris Lattner. 
llvm-svn: 31696
 2006-11-13 00:23:28 +00:00
Chris Lattner 4e03cb1945 add a note about viterbi 
llvm-svn: 31612
 2006-11-10 00:23:26 +00:00
Chris Lattner 7e885005ba add a note 
llvm-svn: 31477
 2006-11-06 21:26:49 +00:00
Chris Lattner 2048373e71 add a note 
llvm-svn: 31429
 2006-11-03 22:27:39 +00:00
Reid Spencer 7e80b0b31e For PR950: 
Make necessary changes to support DIV -> [SUF]Div. This changes llvm to
have three division instructions: signed, unsigned, floating point. The
bytecode and assembler are bacwards compatible, however.

llvm-svn: 31195
 2006-10-26 06:15:43 +00:00
Chris Lattner f054003ba7 new bad case 
llvm-svn: 31156
 2006-10-24 16:12:47 +00:00
Chris Lattner 3cbd1604f8 add a note about a general improvement to the code generator 
llvm-svn: 30642
 2006-09-28 06:01:17 +00:00
Chris Lattner f11327daab more notes 
llvm-svn: 30598
 2006-09-25 17:12:14 +00:00
Chris Lattner b94df039c0 item done 
llvm-svn: 30483
 2006-09-19 06:19:03 +00:00
Chris Lattner 4a13d3b391 This is closer to what we really want. 
llvm-svn: 30451
 2006-09-18 04:54:35 +00:00
Chris Lattner f7e3478745 add a note noticed through source inspection 
llvm-svn: 30418
 2006-09-16 23:57:51 +00:00
Chris Lattner c9dc375d3e add a nate note 
llvm-svn: 30399
 2006-09-15 20:31:36 +00:00
Chris Lattner ac40a81253 We compile this into: 
_swap_16:
        slwi r2, r3, 24
        rlwimi r2, r3, 8, 8, 15
        srwi r3, r2, 16
        blr

now.

llvm-svn: 29864
 2006-08-24 23:06:02 +00:00
Chris Lattner fb6bc15d5d Owen implemented this. 
llvm-svn: 29863
 2006-08-24 23:03:33 +00:00
Chris Lattner a5d4587296 Add a note 
llvm-svn: 28572
 2006-05-30 21:29:15 +00:00
Chris Lattner 80b0a70911 Add a note 
llvm-svn: 28424
 2006-05-21 03:57:07 +00:00
Chris Lattner 29d7bded45 Add a note 
llvm-svn: 28402
 2006-05-19 21:01:38 +00:00
Chris Lattner 240f846495 Move a target-independent note out of the X86 readme. 
llvm-svn: 28398
 2006-05-19 20:45:08 +00:00
Chris Lattner 4cda95b32f add a note 
llvm-svn: 28384
 2006-05-18 18:26:13 +00:00
Chris Lattner d1c3a067ee add a note 
llvm-svn: 27907
 2006-04-20 18:49:28 +00:00
Chris Lattner 7a29cf3c7f New note 
llvm-svn: 27337
 2006-04-02 01:47:20 +00:00
Chris Lattner 0baebb11bf ADd a note 
llvm-svn: 27324
 2006-04-01 04:08:29 +00:00
Evan Cheng dc1161cf53 An entry about packed type alignments. 
llvm-svn: 27321
 2006-03-31 22:35:14 +00:00
Chris Lattner 0affd76182 add a note 
llvm-svn: 27076
 2006-03-24 19:59:17 +00:00