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66 Commits

Author SHA1 Message Date
Christopher Lamb
30f017ad89 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


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45158 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-18 09:34:41 +00:00
Chris Lattner
fd2025e9db add a missed case. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45141 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-18 01:19:18 +00:00
Chris Lattner
e70da20f9a 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



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44656 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-06 07:33:36 +00:00
Chris Lattner
81f2d71d52 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44638 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-05 23:05:06 +00:00
Chris Lattner
e1bb6ab7b0 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42573 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-10-03 06:10:59 +00:00
Chris Lattner
f110a2bdb6 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36811 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-05-05 22:44:08 +00:00
Chris Lattner
5e14b0d3e6 the mason example is implemented. Move some examples out of llvm/test, 
upgrade the syntax of some other examples.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36806 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-05-05 22:29:06 +00:00
Chris Lattner
1a77a556cd add a bad case evan though of. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35296 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-24 06:01:32 +00:00
Chris Lattner
11a3a9d27d minor updates 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35143 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-18 22:41:33 +00:00
Nick Lewycky
7f4ba44f37 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
        ]

...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35142 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-18 14:37:20 +00:00
Reid Spencer
ac9dcb94dd For PR1195: 
Change use of "packed" term to "vector" in comments, strings, variable
names, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34300 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-15 03:39:18 +00:00
Chris Lattner
36e37d2944 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34249 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-13 21:44:43 +00:00
Chris Lattner
03a6d96d32 add a note: we need whole-function selectiondags :) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33252 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-01-16 06:39:48 +00:00
Reid Spencer
e4d87aa2de 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32751 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-23 06:05:41 +00:00
Chris Lattner
a5546fbd10 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32423 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-11 00:44:03 +00:00
Chris Lattner
f9bae438aa add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32347 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-12-08 02:01:32 +00:00
Chris Lattner
641c523599 done 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32013 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-29 07:21:46 +00:00
Chris Lattner
9b62b458c5 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31719 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-14 01:57:53 +00:00
Nick Lewycky
bf63734a1b Cute example from Chris Lattner. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31696 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-13 00:23:28 +00:00
Chris Lattner
578d2df84b add a note about viterbi 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31612 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-10 00:23:26 +00:00
Chris Lattner
8c97c07040 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31477 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-06 21:26:49 +00:00
Chris Lattner
d7c628de89 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31429 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-03 22:27:39 +00:00
Reid Spencer
1628cec4d7 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31195 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-10-26 06:15:43 +00:00
Chris Lattner
cf10391a72 new bad case 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31156 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-10-24 16:12:47 +00:00
Chris Lattner
f308ea01d5 add a note about a general improvement to the code generator 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30642 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-28 06:01:17 +00:00
Chris Lattner
fb981f3fee more notes 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30598 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-25 17:12:14 +00:00
Chris Lattner
f529b08c0d item done 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30483 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-19 06:19:03 +00:00
Chris Lattner
b33a42a21f This is closer to what we really want. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30451 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-18 04:54:35 +00:00
Chris Lattner
7ed96abc09 add a note noticed through source inspection 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30418 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-16 23:57:51 +00:00
Chris Lattner
cbce2f6c1b add a nate note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30399 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-15 20:31:36 +00:00
Chris Lattner
bf16982e86 We compile this into: 
_swap_16:
        slwi r2, r3, 24
        rlwimi r2, r3, 8, 8, 15
        srwi r3, r2, 16
        blr

now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29864 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-08-24 23:06:02 +00:00
Chris Lattner
ad69970c4a Owen implemented this. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29863 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-08-24 23:03:33 +00:00
Chris Lattner
9e18ef5262 Add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28572 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-30 21:29:15 +00:00
Chris Lattner
e8263e6437 Add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28424 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-21 03:57:07 +00:00
Chris Lattner
f00f68ad0d Add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28402 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-19 21:01:38 +00:00
Chris Lattner
870cf1b715 Move a target-independent note out of the X86 readme. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28398 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-19 20:45:08 +00:00
Chris Lattner
16abfdfc22 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28384 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-18 18:26:13 +00:00
Chris Lattner
879acefed5 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27907 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-04-20 18:49:28 +00:00
Chris Lattner
5295122b0d New note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27337 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-04-02 01:47:20 +00:00
Chris Lattner
eaa7c06d86 ADd a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27324 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-04-01 04:08:29 +00:00
Evan Cheng
67d3d4c085 An entry about packed type alignments. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27321 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-31 22:35:14 +00:00
Chris Lattner
e6cd96d467 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27076 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-24 19:59:17 +00:00
Chris Lattner
c04b423f14 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26950 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-22 07:33:46 +00:00
Evan Cheng
d3864b5743 Remind us of exit value substitution 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26862 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-19 06:09:23 +00:00
Nate Begeman
81e8097377 Remove BRTWOWAY* 
Make the PPC backend not dependent on BRTWOWAY_CC and make the branch
selector smarter about the code it generates, fixing a case in the
readme.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26814 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-17 01:40:33 +00:00
Chris Lattner
cbd3cdd239 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26762 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-14 19:31:24 +00:00
Chris Lattner
ad5a3a0265 transformation implemented 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26754 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-14 06:57:34 +00:00
Evan Cheng
e617b085fe Update 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26741 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-13 23:19:10 +00:00
Chris Lattner
2e8a77ff42 remove two implemented items 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26728 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-13 06:52:22 +00:00
Chris Lattner
74cfb7d7b3 add an example 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26709 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-11 20:20:40 +00:00