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365774f457
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1742 Commits

Author SHA1 Message Date
Chris Lattner
365774f457 Don't create zero sized stack objects even for array allocas with a zero 
number of elements.

llvm-svn: 23219
 2005-09-02 18:41:28 +00:00
Chris Lattner
7d89863a77 Fix the release build, noticed by Eric van Riet Paap 
llvm-svn: 23215
 2005-09-02 07:09:28 +00:00
Chris Lattner
86bed2f90b Make sure to legalize assert[zs]ext's operand correctly 
llvm-svn: 23208
 2005-09-02 01:15:01 +00:00
Chris Lattner
4919477f39 Teach live intervals to not crash on dead livein regs 
llvm-svn: 23206
 2005-09-02 00:20:32 +00:00
Chris Lattner
8a6c15f4f4 For values that are live across basic blocks and need promotion, use ANY_EXTEND 
instead of ZERO_EXTEND to eliminate extraneous extensions.  This eliminates
dead zero extensions on formal arguments and other cases on PPC, implementing
the newly tightened up test/Regression/CodeGen/PowerPC/small-arguments.ll test.

llvm-svn: 23205
 2005-09-02 00:19:37 +00:00
Chris Lattner
aae61e684c legalize ANY_EXTEND appropriately 
llvm-svn: 23204
 2005-09-02 00:18:10 +00:00
Chris Lattner
3f7fbe14a8 Add support for ANY_EXTEND and add a few minor folds for it 
llvm-svn: 23203
 2005-09-02 00:17:32 +00:00
Nate Begeman
626c46f8d9 Fix some code in the current node combining code, spotted when it was moved 
over to DAGCombiner.cpp

1. Don't assume that SetCC returns i1 when folding (xor (setcc) constant)
2. Don't duplicate code in folding AND with AssertZext that is handled by
   MaskedValueIsZero

llvm-svn: 23196
 2005-09-01 23:25:49 +00:00
Nate Begeman
18f456b8e3 Implement first round of feedback from chris (there's still a couple things 
left to do).

llvm-svn: 23195
 2005-09-01 23:24:04 +00:00
Chris Lattner
f2b775d686 It is NDEBUG not _NDEBUG 
llvm-svn: 23186
 2005-09-01 18:44:10 +00:00
Nate Begeman
517e40a5bb Add the rest of the currently implemented visit routines to the switch 
statement in visit().

llvm-svn: 23185
 2005-09-01 00:33:32 +00:00
Nate Begeman
be2fa8f86f First pass at the DAG Combiner. It isn't used anywhere yet, but it should 
be mostly functional.  It currently has all folds from SelectionDAG.cpp
that do not involve a condition code.

llvm-svn: 23184
 2005-09-01 00:19:25 +00:00
Chris Lattner
b8dcea186c If a function has live ins/outs, print them 
llvm-svn: 23181
 2005-08-31 22:34:59 +00:00
Chris Lattner
fc612f96ec Allow targets to custom expand shifts that are too large for their registers 
llvm-svn: 23173
 2005-08-31 19:01:53 +00:00
Jeff Cohen
8c454a3024 Fix VC++ precedence warnings 
llvm-svn: 23169
 2005-08-31 02:47:06 +00:00
Nate Begeman
64ea782435 Sigh, not my day. Fix typo. 
llvm-svn: 23166
 2005-08-31 00:43:49 +00:00
Nate Begeman
d286f16856 Fix a mistake in my previous patch pointed out by sabre; the AssertZext 
case in MaskedValueIsZero was wrong.

llvm-svn: 23165
 2005-08-31 00:43:08 +00:00
Nate Begeman
d754412b26 Remove some unnecessary casts, and add the AssertZext case to 
MaskedValueIsZero.

llvm-svn: 23164
 2005-08-31 00:27:53 +00:00
Chris Lattner
87d45af685 Allow physregs to occur in the dag with multiple types. Though I don't likethis, it is a requirement on PPC, which can have an f32 value in r3 at onepoint in a function and a f64 value in r3 at another point. :( 
This fixes compilation of mesa

llvm-svn: 23161
 2005-08-30 22:38:38 +00:00
Chris Lattner
36461b2e37 When checking the fixed intervals, don't forget to check for register aliases. 
This fixes PR621 and Regression/CodeGen/X86/2005-08-30-RegAllocAliasProblem.ll

llvm-svn: 23158
 2005-08-30 21:03:36 +00:00
Chris Lattner
6a990c392c Fix FreeBench/fourinarow with the dag isel, by not adding a bogus result 
to SHIFT_PARTS nodes

llvm-svn: 23151
 2005-08-30 17:21:17 +00:00
Chris Lattner
772c8814b6 Fix a miscompile of PtrDist/bc. Sign extending bools is not the right thing, 
at least tends to expose problems elsewhere.

llvm-svn: 23149
 2005-08-30 16:56:19 +00:00
Nate Begeman
25755f7f00 Remove a bogus piece of my AssertSext/AssertZext patch. oops. 
llvm-svn: 23148
 2005-08-30 02:54:28 +00:00
Nate Begeman
dc36f47d99 Add support for AssertSext and AssertZext, folding other extensions with 
them.  This allows for elminination of redundant extends in the entry
blocks of functions on PowerPC.

Add support for i32 x i32 -> i64 multiplies, by recognizing when the inputs
to ISD::MUL in ExpandOp are actually just extended i32 values and not real
i64 values.  this allows us to codegen

int mulhs(int a, int b) { return ((long long)a * b) >> 32; }
as:
_mulhs:
        mulhw r3, r4, r3
        blr

instead of:
_mulhs:
        mulhwu r2, r4, r3
        srawi r5, r3, 31
        mullw r5, r4, r5
        add r2, r2, r5
        srawi r4, r4, 31
        mullw r3, r4, r3
        add r3, r2, r3
        blr

with a similar improvement on x86.

llvm-svn: 23147
 2005-08-30 02:44:00 +00:00
Chris Lattner
a611caeec8 Name this variable to be what it really is! 
llvm-svn: 23145
 2005-08-30 01:58:51 +00:00
Chris Lattner
56051a0f92 Handle CopyToReg nodes with flag operands correctly 
llvm-svn: 23144
 2005-08-30 01:57:23 +00:00
Chris Lattner
774b9718dc Add a hack to avoid some horrible code in some cases by always emitting 
token chains first.  For this C function:

int test() {
  int i;
  for (i = 0; i < 100000; ++i)
    foo();
}

Instead of emitting this (condition before call)

.LBB_test_1:    ; no_exit
        addi r30, r30, 1
        lis r2, 1
        ori r2, r2, 34464
        cmpw cr2, r30, r2
        bl L_foo$stub
        bne cr2, .LBB_test_1    ; no_exit

Emit this:

.LBB_test_1:    ; no_exit
        bl L_foo$stub
        addi r30, r30, 1
        lis r2, 1
        ori r2, r2, 34464
        cmpw cr0, r30, r2
        bne cr0, .LBB_test_1    ; no_exit

Which makes it so we don't have to save/restore cr2 in the prolog/epilog of
the function.

This also makes the code much more similar to what the pattern isel produces.

llvm-svn: 23135
 2005-08-29 23:21:29 +00:00
Chris Lattner
32609690c3 Add a new API for Nate 
llvm-svn: 23131
 2005-08-29 21:59:31 +00:00
Andrew Lenharth
f580b078b6 Some of us cared about the the promote path 
llvm-svn: 23130
 2005-08-29 20:46:51 +00:00
Chris Lattner
b0e46fa671 Fix an infinite loop on x86 
llvm-svn: 23129
 2005-08-29 17:30:00 +00:00
Chris Lattner
21400573a7 Fix a bug in my previous patch that was using the wrong iterator. This fixes 
Olden/bisort among others.

llvm-svn: 23124
 2005-08-29 00:10:46 +00:00
Chris Lattner
44dcf508a1 Fix a bug in ReplaceAllUsesWith 
llvm-svn: 23122
 2005-08-28 23:59:36 +00:00
Chris Lattner
e0eae3d244 Disable this code, which broke many tests last night 
llvm-svn: 23114
 2005-08-27 16:16:51 +00:00
Chris Lattner
6bf97cff13 fix PHI node emission for basic blocks that have select_cc's in them on ppc32 
llvm-svn: 23113
 2005-08-27 00:58:02 +00:00
Chris Lattner
35a82f5f79 Nate noticed that Andrew never did this. This fixes PR600 
llvm-svn: 23110
 2005-08-26 22:50:40 +00:00
Chris Lattner
e9cc12f5c4 Don't copy regs that are only used in the entry block into a vreg. This 
changes the code generated for:

short %test(short %A) {
  %B = xor short %A, -32768
  ret short %B
}

to:

_test:
        xori r2, r3, 32768
        xoris r2, r2, 65535
        extsh r3, r2
        blr

instead of:

_test:
        rlwinm r2, r3, 0, 16, 31
        xori r2, r3, 32768
        xoris r2, r2, 65535
        extsh r3, r2
        blr

llvm-svn: 23109
 2005-08-26 22:49:59 +00:00
Chris Lattner
5f55dd72af Make this code safe for when loadRegFromStackSlot inserts multiple instructions. 
llvm-svn: 23108
 2005-08-26 22:18:32 +00:00
Chris Lattner
7efca0c312 Checking types here is not safe, because multiple types can map to the same 
register class.

llvm-svn: 23103
 2005-08-26 21:39:15 +00:00
Chris Lattner
faa96209d8 Call the InsertAtEndOfBasicBlock hook if the usesCustomDAGSchedInserter 
flag is set on an instruction.

llvm-svn: 23098
 2005-08-26 20:54:47 +00:00
Chris Lattner
3e0bfc0cc1 Revampt ReplaceAllUsesWith to be more efficient and easier to use. 
llvm-svn: 23087
 2005-08-26 18:36:28 +00:00
Chris Lattner
a31708e6b3 Change ConstantPoolSDNode to actually hold the Constant itself instead of 
putting it into the constant pool.  This allows the isel machinery to
create constants that it will end up deciding are not needed, without them
ending up in the resultant function constant pool.

llvm-svn: 23081
 2005-08-26 17:15:30 +00:00
Chris Lattner
929c00e9e9 Fix a huge annoyance: SelectNodeTo took types before the opcode unlike 
every other SD API.  Fix it to take the opcode before the types.

llvm-svn: 23079
 2005-08-26 16:36:26 +00:00
Chris Lattner
6d22117d76 the 5th operand is the 4th number 
llvm-svn: 23074
 2005-08-26 00:43:46 +00:00
Chris Lattner
f25ec1b7b9 Add support for targets that want to custom expand select_cc in some cases. 
llvm-svn: 23071
 2005-08-26 00:23:59 +00:00
Chris Lattner
7e68d39877 Allow LowerOperation to return a null SDOperand in case it wants to lower 
some things given to it, but not all.

llvm-svn: 23070
 2005-08-26 00:14:16 +00:00
Chris Lattner
2c3fbbab05 Fix a nasty bug from a previous patch of mine 
llvm-svn: 23069
 2005-08-26 00:13:12 +00:00
Nate Begeman
54f44ad750 New fold for SELECT_CC 
llvm-svn: 23058
 2005-08-25 20:04:38 +00:00
Chris Lattner
18572f3c67 Don't auto-cse nodes that return flags 
llvm-svn: 23055
 2005-08-25 19:12:10 +00:00
Chris Lattner
cb3910fa74 add printer support for flag operands 
llvm-svn: 23054
 2005-08-25 17:59:23 +00:00
Chris Lattner
7c7a447220 simplify the code a bit using isOperationLegal 
llvm-svn: 23053
 2005-08-25 17:54:58 +00:00