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Author SHA1 Message Date
Chris Lattner
87514ca04c Implement trivial DSE. If two stores are neighbors and store to the same 
location, replace them with a new store of the last value.  This occurs
in the same neighborhood in 197.parser, speeding it up about 1.5%


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23691 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 22:31:19 +00:00
Chris Lattner
01a2202138 Add support for CombineTo, allowing the dag combiner to replace nodes with 
multiple results.

Use this support to implement trivial store->load forwarding, implementing
CodeGen/PowerPC/store-load-fwd.ll.  Though this is the most simple case and
can be extended in the future, it is still useful.  For example, it speeds
up 197.parser by 6.2% by avoiding an LSU reject in xalloc:

        stw r6, lo16(l5_end_of_array)(r2)
        addi r2, r5, -4
        stwx r5, r4, r2
-       lwzx r5, r4, r2
-       rlwinm r5, r5, 0, 0, 30
        stwx r5, r4, r2
        lwz r2, -4(r4)
        ori r2, r2, 1


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23690 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 22:04:48 +00:00
Chris Lattner
e64dfbc10b new testcase 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23689 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 21:57:37 +00:00
Nate Begeman
07ed417df2 Teach the DAGCombiner several new tricks, teaching it how to turn 
sext_inreg into zext_inreg based on the signbit (fires a lot), srem into
urem, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23688 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 21:26:48 +00:00
Chris Lattner
1628947362 A testcase sitting in my tree 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23687 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 21:21:36 +00:00
Chris Lattner
d739075cbb Fix comment 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23686 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 16:52:03 +00:00
Chris Lattner
bba9aa3475 Add ISD::ADD to MaskedValueIsZero 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23685 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 16:51:40 +00:00
Chris Lattner
3892560680 This function is now dead 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23684 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 16:49:22 +00:00
Chris Lattner
af21d55aee Enable Nate's excellent DAG combiner work by default. This allows the 
removal of a bunch of ad-hoc and crufty code from SelectionDAG.cpp.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23682 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 16:47:10 +00:00
Chris Lattner
7b1fe15de0 These definitions have been moved to common code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23681 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 06:01:00 +00:00
Chris Lattner
17f2cf05b3 Pull DAG ISel generation nodes out of the PowerPC backend to where they 
can be used by other targets.  For those targets that want to use it,
have at.  :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23680 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-10 06:00:30 +00:00
Chris Lattner
a19cea061e add a todo for something I noticed 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23679 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 22:59:08 +00:00
Chris Lattner
ee899e6bfc (X & Y) & C == 0 if either X&C or Y&C are zero 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23678 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 22:12:36 +00:00
Chris Lattner
5fb0deb43a Make MaskedValueIsZero a bit more aggressive 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23677 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 22:08:50 +00:00
Andrew Lenharth
fa08fb2c78 This seems useful from the original patch that added the function. If there is a reason it is not useful on a RISC type target, let me know and I will pull it out 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23676 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 20:11:35 +00:00
Chris Lattner
60de63d0b6 Fix funky xcode indentation 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23674 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 06:36:35 +00:00
Chris Lattner
a18af06360 Hrm, you didn't see this. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23673 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 06:24:02 +00:00
Chris Lattner
7305ae28df Fix a source of non-determinism in the backend: the order of processing 
IV strides dependend on the pointer order of the strides in memory.
Non-determinism is bad.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23672 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 06:20:55 +00:00
Chris Lattner
089c25ccb3 When emiting a CopyFromReg and the source is already a vreg, do not bother 
creating a new vreg and inserting a copy: just use the input vreg directly.

This speeds up the compile (e.g. about 5% on mesa with a debug build of llc)
by not adding a bunch of copies and vregs to be coallesced away.  On mesa,
for example, this reduces the number of intervals from 168601 to 129040
going into the coallescer.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23671 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 05:58:56 +00:00
Chris Lattner
65a419a104 Disable formation of rlwinm instructions from SRA bases. This fixes 
the 177.mesa failure from last night, and fixes the
CodeGen/PowerPC/2005-10-08-ArithmeticRotate.ll regression test I added.
If this code cannot be fixed, it should be removed for good, but I'll leave
it to Nate to decide its fate.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23670 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 05:36:17 +00:00
Chris Lattner
0cb34c4714 Testcase that is miscompiled by the ppc backend 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23669 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-09 05:31:47 +00:00
Nate Begeman
7d47a61496 Remove another unused file. Preparing for the great "enable i64 on ppc32" 
merge, and using subtarget info for ptr size.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23668 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-08 01:32:34 +00:00
Chris Lattner
b995c5e118 remove a comma to compile with pedantic gcc 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23667 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-08 01:24:19 +00:00
Nate Begeman
02f77d1e83 Remove a file that is no longer used 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23666 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-08 01:21:27 +00:00
Nate Begeman
f845b4563a Lo and behold, the last bits of SelectionDAG.cpp have been moved over. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23665 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-08 00:29:44 +00:00
Chris Lattner
cf01a70550 When preselecting, favor things that have low depth to select first. This 
is faster and uses less stack space.  This reduces our stack requirement
enough to compile sixtrack, and though it's a hack, should be enough until
we switch to iterative isel


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23664 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 22:10:27 +00:00
Chris Lattner
9a9719eea1 remove debugging code 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23663 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 15:31:26 +00:00
Chris Lattner
c4ced268d8 implement CodeGen/PowerPC/div-2.ll:test2-4 by propagating zero bits through 
C-X's


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23662 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 15:30:32 +00:00
Chris Lattner
a77e86e73e These don't need to be sdivs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23661 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 15:27:12 +00:00
Chris Lattner
6c4dad0b8b fix indentation 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23660 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 06:37:02 +00:00
Chris Lattner
094c8fcd14 Turn sdivs into udivs when we can prove the sign bits are clear. This 
implements CodeGen/PowerPC/div-2.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23659 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 06:10:46 +00:00
Chris Lattner
babac05a95 New testcase, should turn into a ushr 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23658 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 06:10:03 +00:00
Jeff Cohen
cadee65f54 Remove prolific source of VC++ truncation warnings. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23657 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 05:29:25 +00:00
Jeff Cohen
68d98e0bdc Remove useless variable. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23656 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 05:28:29 +00:00
Chris Lattner
71abaab1d2 add a hack to work around broken VC++ scoping rules. Thx to JeffC for pointing 
this out to me


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23655 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 05:23:36 +00:00
Chris Lattner
eb5d47d99d Fix a CQ regression from my patch to split F32/F64 into seperate register 
classes on PPC.  We were emitting fmr instructions to do fp extensions, which
weren't getting coallesced.  This fixes Regression/CodeGen/PowerPC/fpcopy.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23654 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 05:00:52 +00:00
Chris Lattner
602b02a8f4 double to float casts should nto result in an fmr 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23653 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 04:59:41 +00:00
Chris Lattner
7a7c979ddd Fix CodeGen/Generic/bool-to-double.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23652 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 04:50:48 +00:00
Chris Lattner
ee738803c4 test broken in the IA64 backend. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23651 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-07 04:49:00 +00:00
Chris Lattner
6a16f6a14f Pull out Call, reducing stack frame size from 6032 bytes to 5184 bytes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23650 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-06 19:07:45 +00:00
Chris Lattner
222adac30a Pull out setcc, this reduces stack frame size from 7520 to 6032 bytes 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23649 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-06 19:03:35 +00:00
Chris Lattner
2b63e4c5e2 Pull two more methods out, reducing stack frame size from 8224 -> 7520 bytes 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23648 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-06 18:56:10 +00:00
Chris Lattner
bd937b98f4 Add a recursive-iterative hybrid stage to attempt to reduce stack space, this 
helps but not enough.

Start pulling cases out of PPC32DAGToDAGISel::Select.  With GCC 4, this function
required 8512 bytes of stack space for each invocation (GCC 3 required less
than 700 bytes).  Pulling this first function out gets us down to 8224.  More
to come :(


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23647 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-06 18:45:51 +00:00
Chris Lattner
cf5c79b34f silence a bogus GCC warning 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23646 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-06 17:39:10 +00:00
Chris Lattner
8a61a7524a Fix the LLC regressions on X86 last night. In particular, when undoing 
previous copy elisions and we discover we need to reload a register, make
sure to use the regclass of the original register for the reload, not the
class of the current register.  This avoid using 16-bit loads to reload 32-bit
values.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23645 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-06 17:19:06 +00:00
Andrew Lenharth
f3fb71bfd7 This is suppose to work now 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23644 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-06 16:54:29 +00:00
Andrew Lenharth
d5613debf9 remove VAX compatibility instruction, we will never use this 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23643 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-06 16:53:32 +00:00
Chris Lattner
32fca00a23 Make the legalizer completely non-recursive 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23642 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-06 01:20:27 +00:00
Nate Begeman
0558f61b0c Let the combiner handle more cases 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23641 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-05 21:44:43 +00:00
Nate Begeman
829cb81806 Remove some bad code from Legalize 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23640 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-10-05 21:44:10 +00:00