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122 Commits

Author SHA1 Message Date
Chris Lattner
150943c178 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47830 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-03-02 19:27:34 +00:00
Chris Lattner
3be4893dce Evan implemented this. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47827 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-03-02 17:56:29 +00:00
Nate Begeman
a6ed0aa8ec additional missing feature 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46948 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-02-11 04:16:09 +00:00
Chris Lattner
e46307a54c If someone wants to implement ppc TRAP, they can go for it :) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46019 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-15 22:15:02 +00:00
Chris Lattner
fe39edde27 Finally implement correct ordered comparisons for PPC, even though 
the code generated is not wonderful.  This turns a miscompilation into
a code quality bug (noted in the ppc readme).  This fixes PR642, which
is over 2 years old (!).  Nate, please review this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45742 91177308-0d34-0410-b5e6-96231b3b80d8
 2008-01-08 06:46:30 +00:00
Chris Lattner
3fc027df4f implement __builtin_return_addr(0) on ppc. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44700 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-12-08 06:59:59 +00:00
Chris Lattner
bf8ae84a21 Add some notes about better flag handling. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41808 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-09-10 21:43:18 +00:00
Chris Lattner
aabd0359a3 new example 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41318 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-08-23 15:16:03 +00:00
Chris Lattner
fcb1e61a43 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35530 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-31 07:06:25 +00:00
Chris Lattner
86c9c341e9 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35334 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-25 05:10:46 +00:00
Chris Lattner
013e051aac add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35330 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-03-25 04:46:28 +00:00
Chris Lattner
8abcfe11b5 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34101 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-09 17:38:01 +00:00
Nate Begeman
8c541bcc56 Remove fixed item 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34081 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-02-09 04:19:54 +00:00
Chris Lattner
95b9d6e5d8 A relatively simple PPC optimization. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33709 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-01-31 19:49:20 +00:00
Nate Begeman
908049b7b6 Update some of the llvm in the readme 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33630 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-01-29 21:21:22 +00:00
Chris Lattner
afd7a08a76 move contents of PR587 to here. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33333 91177308-0d34-0410-b5e6-96231b3b80d8
 2007-01-18 07:34:57 +00:00
Chris Lattner
54e853b8a6 Rewrite the branch selector to be correct in the face of large functions. 
The algorithm it used before wasn't 100% correct, we now use an iterative
expansion model.  This fixes assembler errors when compiling 403.gcc with
tail merging enabled.

Change the way the branch selector works overall: Now, the isel generates
PPC::BCC instructions (as it used to) directly, and these BCC instructions
are emitted to the output or jitted directly if branches don't need
expansion.  Only if branches need expansion are instructions rewritten
and created.  This should make branch select faster, and eliminates the
Bxx instructions from the .td file.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31837 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-18 00:32:03 +00:00
Chris Lattner
26ddb506ec add note about ugly codegen with preinc 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31617 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-10 01:33:53 +00:00
Chris Lattner
6e11295b23 add a note from viterbi 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31506 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-11-07 18:30:21 +00:00
Chris Lattner
7a498cbc60 this doesn't occur any more in mason 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31236 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-10-27 22:02:19 +00:00
Chris Lattner
4ccf63d8cf the code in question is now: 
cmpw cr0, r7, r3
        ble cr0, LBB1_5 ;bb25
LBB1_8: ;bb17
        cmpw cr0, r8, r5
        bgt cr0, LBB1_2 ;bb

which is just as good as crnand.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31235 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-10-27 22:00:55 +00:00
Chris Lattner
6a250ecc99 add note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30937 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-10-13 20:20:58 +00:00
Nate Begeman
f42f133938 Fold AND and ROTL more often 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30577 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-22 05:01:56 +00:00
Chris Lattner
f142713a30 item done 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30518 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-20 06:41:56 +00:00
Chris Lattner
ac924c8248 This is already done 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30512 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-20 04:59:33 +00:00
Chris Lattner
3836dbd3bd Two improvements: 
1. Codegen this comparison:
     if (X == 0x8000)

as:

        cmplwi cr0, r3, 32768
        bne cr0, LBB1_2 ;cond_next

instead of:

        lis r2, 0
        ori r2, r2, 32768
        cmpw cr0, r3, r2
        bne cr0, LBB1_2 ;cond_next


2. Codegen this comparison:
      if (X == 0x12345678)

as:

        xoris r2, r3, 4660
        cmplwi cr0, r2, 22136
        bne cr0, LBB1_2 ;cond_next

instead of:

        lis r2, 4660
        ori r2, r2, 22136
        cmpw cr0, r3, r2
        bne cr0, LBB1_2 ;cond_next


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30509 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-20 04:25:47 +00:00
Chris Lattner
cc96ac3a7d Add a note that we should match rlwnm better 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30508 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-20 03:59:25 +00:00
Chris Lattner
f0613e1e7c add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30377 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-09-14 20:56:30 +00:00
Chris Lattner
1eeedaea59 Add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29139 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-07-14 04:07:29 +00:00
Chris Lattner
d998938459 Implement Regression/CodeGen/PowerPC/bswap-load-store.ll by folding bswaps 
into i16/i32 load/stores.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29089 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-07-10 20:56:58 +00:00
Chris Lattner
9d62fa4d16 Add a note about a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28355 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-17 19:02:25 +00:00
Nate Begeman
7514620052 Yet more readme updating 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28172 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 20:54:02 +00:00
Nate Begeman
fcf64a91d6 New note about something bad happening in target independent optimizers 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28170 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 20:08:28 +00:00
Nate Begeman
d8624ed07f Proving once again that I am not as smart as the compiler 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28169 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 19:09:24 +00:00
Nate Begeman
4667f2cbad Fold more shifts into inserts, and update the README 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28168 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 17:38:32 +00:00
Nate Begeman
93376b083e Update some stuff now that the new rlwimi code has gone in 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28162 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-08 02:52:38 +00:00
Chris Lattner
55c63257f3 New note, Nate, please check to see if I'm full of it :) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28118 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-05-05 05:36:15 +00:00
Chris Lattner
ed93790517 add a note, move an altivec todo to the altivec list. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27654 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-04-13 16:48:00 +00:00
Chris Lattner
220d2b89d6 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27360 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-04-02 07:20:00 +00:00
Chris Lattner
b86bd2cee2 Split out altivec notes into their own README 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27168 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-27 07:04:16 +00:00
Chris Lattner
420736dc85 #include Intrinsics.h into all dag isels 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27109 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-25 06:47:10 +00:00
Chris Lattner
057f09bc0b add another note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27077 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-24 20:04:27 +00:00
Chris Lattner
716aefcd91 add a note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27000 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-23 21:28:44 +00:00
Chris Lattner
9d86a9dff2 This has been implemented. Tweak it into another note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26944 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-22 05:33:23 +00:00
Nate Begeman
c0a8b6df2a Update readme 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26924 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-21 18:58:20 +00:00
Chris Lattner
ef040dd4a3 minor note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26912 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-21 00:47:09 +00:00
Chris Lattner
28097d086f Add a note about the MUL -> FMADD vector bug. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26874 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-19 22:08:08 +00:00
Chris Lattner
28b1a0b532 notes 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26856 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-19 05:33:30 +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
Nate Begeman
1ad9b3a3cc Notes on how to kill the eeevil brtwoway, and make ppc branch selector 
more target independant, generate better code, and be less conservative.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26809 91177308-0d34-0410-b5e6-96231b3b80d8
 2006-03-16 22:37:48 +00:00