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106 Commits

Author SHA1 Message Date
Chris Lattner
f50d87eb50 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.

llvm-svn: 31837
 2006-11-18 00:32:03 +00:00
Chris Lattner
15c49af63f add note about ugly codegen with preinc 
llvm-svn: 31617
 2006-11-10 01:33:53 +00:00
Chris Lattner
f64e5f5f3e add a note from viterbi 
llvm-svn: 31506
 2006-11-07 18:30:21 +00:00
Chris Lattner
838d0cbb0a this doesn't occur any more in mason 
llvm-svn: 31236
 2006-10-27 22:02:19 +00:00
Chris Lattner
6fe4efd730 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.

llvm-svn: 31235
 2006-10-27 22:00:55 +00:00
Chris Lattner
b22754853b add note 
llvm-svn: 30937
 2006-10-13 20:20:58 +00:00
Nate Begeman
7bcce1a7f6 Fold AND and ROTL more often 
llvm-svn: 30577
 2006-09-22 05:01:56 +00:00
Chris Lattner
6b434ee662 item done 
llvm-svn: 30518
 2006-09-20 06:41:56 +00:00
Chris Lattner
102718b1b2 This is already done 
llvm-svn: 30512
 2006-09-20 04:59:33 +00:00
Chris Lattner
69390a3f80 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

llvm-svn: 30509
 2006-09-20 04:25:47 +00:00
Chris Lattner
ee42b9ae24 Add a note that we should match rlwnm better 
llvm-svn: 30508
 2006-09-20 03:59:25 +00:00
Chris Lattner
ce85ffa396 add a note 
llvm-svn: 30377
 2006-09-14 20:56:30 +00:00
Chris Lattner
9aafd2b441 Add a note 
llvm-svn: 29139
 2006-07-14 04:07:29 +00:00
Chris Lattner
abaaddc214 Implement Regression/CodeGen/PowerPC/bswap-load-store.ll by folding bswaps 
into i16/i32 load/stores.

llvm-svn: 29089
 2006-07-10 20:56:58 +00:00
Chris Lattner
477732bab9 Add a note about a note 
llvm-svn: 28355
 2006-05-17 19:02:25 +00:00
Nate Begeman
db854c6772 Yet more readme updating 
llvm-svn: 28172
 2006-05-08 20:54:02 +00:00
Nate Begeman
1ff4d8f2fe New note about something bad happening in target independent optimizers 
llvm-svn: 28170
 2006-05-08 20:08:28 +00:00
Nate Begeman
b8fa6337df Proving once again that I am not as smart as the compiler 
llvm-svn: 28169
 2006-05-08 19:09:24 +00:00
Nate Begeman
a706539a72 Fold more shifts into inserts, and update the README 
llvm-svn: 28168
 2006-05-08 17:38:32 +00:00
Nate Begeman
591488077e Update some stuff now that the new rlwimi code has gone in 
llvm-svn: 28162
 2006-05-08 02:52:38 +00:00
Chris Lattner
4978a4f2f4 New note, Nate, please check to see if I'm full of it :) 
llvm-svn: 28118
 2006-05-05 05:36:15 +00:00
Chris Lattner
cec07adf4d add a note, move an altivec todo to the altivec list. 
llvm-svn: 27654
 2006-04-13 16:48:00 +00:00
Chris Lattner
fa82c33ae7 add a note 
llvm-svn: 27360
 2006-04-02 07:20:00 +00:00
Chris Lattner
f1d6a9483f Split out altivec notes into their own README 
llvm-svn: 27168
 2006-03-27 07:04:16 +00:00
Chris Lattner
e199d55073 #include Intrinsics.h into all dag isels 
llvm-svn: 27109
 2006-03-25 06:47:10 +00:00
Chris Lattner
8840036091 add another note 
llvm-svn: 27077
 2006-03-24 20:04:27 +00:00
Chris Lattner
2e5162fa6e add a note 
llvm-svn: 27000
 2006-03-23 21:28:44 +00:00
Chris Lattner
5141ebb2c4 This has been implemented. Tweak it into another note 
llvm-svn: 26944
 2006-03-22 05:33:23 +00:00
Nate Begeman
4bd73df4bd Update readme 
llvm-svn: 26924
 2006-03-21 18:58:20 +00:00
Chris Lattner
9e611a25c7 minor note 
llvm-svn: 26912
 2006-03-21 00:47:09 +00:00
Chris Lattner
ada41aad4d Add a note about the MUL -> FMADD vector bug. 
llvm-svn: 26874
 2006-03-19 22:08:08 +00:00
Chris Lattner
d3910ca755 notes 
llvm-svn: 26856
 2006-03-19 05:33:30 +00:00
Nate Begeman
42736d46b2 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.

llvm-svn: 26814
 2006-03-17 01:40:33 +00:00
Nate Begeman
63c4456867 Notes on how to kill the eeevil brtwoway, and make ppc branch selector 
more target independant, generate better code, and be less conservative.

llvm-svn: 26809
 2006-03-16 22:37:48 +00:00
Chris Lattner
8a756c5171 add a note 
llvm-svn: 26807
 2006-03-16 22:25:55 +00:00
Nate Begeman
cbca1b3d14 Another case we could do better on. 
llvm-svn: 26795
 2006-03-16 18:50:44 +00:00
Chris Lattner
24aa564456 add a note 
llvm-svn: 26605
 2006-03-08 00:25:47 +00:00
Chris Lattner
ae34bbf56b add a note 
llvm-svn: 26585
 2006-03-07 04:42:59 +00:00
Chris Lattner
caec0d887c add a note 
llvm-svn: 26448
 2006-03-01 06:36:20 +00:00
Chris Lattner
137c02aa60 Compile this: 
void foo(float a, int *b) { *b = a; }

to this:

_foo:
        fctiwz f0, f1
        stfiwx f0, 0, r4
        blr

instead of this:

_foo:
        fctiwz f0, f1
        stfd f0, -8(r1)
        lwz r2, -4(r1)
        stw r2, 0(r4)
        blr

This implements CodeGen/PowerPC/stfiwx.ll, and also incidentally does the
right thing for GCC bugzilla 26505.

llvm-svn: 26447
 2006-03-01 05:50:56 +00:00
Chris Lattner
6ba976b557 Use a target-specific dag-combine to implement CodeGen/PowerPC/fp-int-fp.ll. 
llvm-svn: 26445
 2006-03-01 04:57:39 +00:00
Chris Lattner
866634d77f remove implemented item 
llvm-svn: 26418
 2006-02-28 06:36:04 +00:00
Nate Begeman
56a4dafd8d readme updates 
llvm-svn: 26405
 2006-02-27 22:08:36 +00:00
Chris Lattner
881c8c12ff Move emails from nate into public places 
llvm-svn: 26051
 2006-02-08 06:43:51 +00:00
Chris Lattner
59378e7675 add a note 
llvm-svn: 25984
 2006-02-05 05:27:35 +00:00
Nate Begeman
ba19f3f93c Remove some stuff that now works 
llvm-svn: 25963
 2006-02-04 07:29:35 +00:00
Chris Lattner
393e9d10dd add a note 
llvm-svn: 25944
 2006-02-03 22:06:45 +00:00
Chris Lattner
172cf85d48 remove some target-indep and implemented notes 
llvm-svn: 25930
 2006-02-03 06:22:11 +00:00
Nate Begeman
85f3c9f566 Flesh out a couple of the items in the README 
llvm-svn: 25928
 2006-02-03 05:17:06 +00:00
Chris Lattner
06f54e7cb3 Add a note 
llvm-svn: 25921
 2006-02-03 01:49:49 +00:00