Chris Lattner
d82b30a996
this is done.
...
llvm-svn: 45408
2007-12-29 19:38:02 +00:00
Chris Lattner
78c7878ca4
expand note.
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llvm-svn: 45393
2007-12-29 01:05:01 +00:00
Chris Lattner
b8e060f7a6
add a note.
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llvm-svn: 45388
2007-12-28 22:30:05 +00:00
Chris Lattner
e53df84267
add a note
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llvm-svn: 45377
2007-12-28 04:42:05 +00:00
Christopher Lamb
aeb76743dc
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
ad090a712a
add a missed case.
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llvm-svn: 45141
2007-12-18 01:19:18 +00:00
Chris Lattner
c467b49c96
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
e3f1487574
add a note
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llvm-svn: 44638
2007-12-05 23:05:06 +00:00
Chris Lattner
17feaa781c
add a note
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llvm-svn: 42573
2007-10-03 06:10:59 +00:00
Chris Lattner
272510387e
add a note
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llvm-svn: 36811
2007-05-05 22:44:08 +00:00
Chris Lattner
0074283b61
the mason example is implemented. Move some examples out of llvm/test,
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upgrade the syntax of some other examples.
llvm-svn: 36806
2007-05-05 22:29:06 +00:00
Chris Lattner
a04981fbda
add a bad case evan though of.
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llvm-svn: 35296
2007-03-24 06:01:32 +00:00
Chris Lattner
a1df6908d2
minor updates
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llvm-svn: 35143
2007-03-18 22:41:33 +00:00
Nick Lewycky
04ecc07c25
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
e7ff3305d6
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
67bdb3aae8
add a note
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llvm-svn: 34249
2007-02-13 21:44:43 +00:00
Chris Lattner
06f52d3e1e
add a note: we need whole-function selectiondags :)
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llvm-svn: 33252
2007-01-16 06:39:48 +00:00
Reid Spencer
4428c3483b
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
48e3989461
Evan implemented the machineinstr improvements.
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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
02a2f33279
add a note
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llvm-svn: 32347
2006-12-08 02:01:32 +00:00
Chris Lattner
e72dff706e
done
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llvm-svn: 32013
2006-11-29 07:21:46 +00:00
Chris Lattner
8913d79def
add a note
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llvm-svn: 31719
2006-11-14 01:57:53 +00:00
Nick Lewycky
f4f28f415d
Cute example from Chris Lattner.
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llvm-svn: 31696
2006-11-13 00:23:28 +00:00
Chris Lattner
48d2b0af37
add a note about viterbi
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llvm-svn: 31612
2006-11-10 00:23:26 +00:00
Chris Lattner
c3e6822514
add a note
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llvm-svn: 31477
2006-11-06 21:26:49 +00:00
Chris Lattner
2cb1391e09
add a note
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llvm-svn: 31429
2006-11-03 22:27:39 +00:00
Reid Spencer
6833ffe8b8
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
efee605648
new bad case
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llvm-svn: 31156
2006-10-24 16:12:47 +00:00
Chris Lattner
6dc95b7b26
add a note about a general improvement to the code generator
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llvm-svn: 30642
2006-09-28 06:01:17 +00:00
Chris Lattner
2281c3f6ca
more notes
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llvm-svn: 30598
2006-09-25 17:12:14 +00:00
Chris Lattner
2b076f26b7
item done
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llvm-svn: 30483
2006-09-19 06:19:03 +00:00
Chris Lattner
a1349de598
This is closer to what we really want.
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llvm-svn: 30451
2006-09-18 04:54:35 +00:00
Chris Lattner
563785bc55
add a note noticed through source inspection
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llvm-svn: 30418
2006-09-16 23:57:51 +00:00
Chris Lattner
bf14089e11
add a nate note
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llvm-svn: 30399
2006-09-15 20:31:36 +00:00
Chris Lattner
b3ab5fac28
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
b8292ee9e7
Owen implemented this.
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llvm-svn: 29863
2006-08-24 23:03:33 +00:00
Chris Lattner
a5c50baaf5
Add a note
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llvm-svn: 28572
2006-05-30 21:29:15 +00:00
Chris Lattner
9d6103087a
Add a note
...
llvm-svn: 28424
2006-05-21 03:57:07 +00:00
Chris Lattner
ec58aa014f
Add a note
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llvm-svn: 28402
2006-05-19 21:01:38 +00:00
Chris Lattner
9c8f608215
Move a target-independent note out of the X86 readme.
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llvm-svn: 28398
2006-05-19 20:45:08 +00:00
Chris Lattner
9c7cab7478
add a note
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llvm-svn: 28384
2006-05-18 18:26:13 +00:00
Chris Lattner
2c1c3896ed
add a note
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llvm-svn: 27907
2006-04-20 18:49:28 +00:00
Chris Lattner
2a24d68439
New note
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llvm-svn: 27337
2006-04-02 01:47:20 +00:00
Chris Lattner
894231e63e
ADd a note
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llvm-svn: 27324
2006-04-01 04:08:29 +00:00
Evan Cheng
403cd8f787
An entry about packed type alignments.
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llvm-svn: 27321
2006-03-31 22:35:14 +00:00
Chris Lattner
045f6bf0ef
add a note
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llvm-svn: 27076
2006-03-24 19:59:17 +00:00
Chris Lattner
64be951e06
add a note
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llvm-svn: 26950
2006-03-22 07:33:46 +00:00
Evan Cheng
9f00d55227
Remind us of exit value substitution
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llvm-svn: 26862
2006-03-19 06:09:23 +00:00
Nate Begeman
42736d46b2
Remove BRTWOWAY*
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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.
llvm-svn: 26814
2006-03-17 01:40:33 +00:00
Chris Lattner
9df7eb4071
add a note
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llvm-svn: 26762
2006-03-14 19:31:24 +00:00