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d3713a9b9a
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139 Commits

Author SHA1 Message Date
Evan Cheng
d3713a9b9a Prevent folding of a node with multiple uses if the node already folds a load! 
Here is an example where the load ended up being done twice:

%A = global uint 0

uint %test(uint %B, ubyte %C) {
	%tmp = load uint *%A;
	%X = shl uint %tmp, ubyte %C
	%Cv = sub ubyte 32, %C
	%Y = shr uint %B, ubyte %Cv
	%Z = or uint %Y, %X
	store uint %Z, uint* %A
	ret uint %Z
}

==>

	subl $4, %esp
	movl %ebx, (%esp)
	movl 8(%esp), %edx
	movl A, %eax
	movb 12(%esp), %bl
	movb %bl, %cl
	shldl %cl, %edx, %eax
	movb %bl, %cl
	shldl %cl, %edx, A
	movl (%esp), %ebx
	addl $4, %esp
	ret

llvm-svn: 25471
 2006-01-20 01:11:03 +00:00
Evan Cheng
4a3ee9d5a6 Bug fix. Flag operand number may be calculated incorrectly. 
llvm-svn: 25465
 2006-01-19 21:57:10 +00:00
Evan Cheng
f168c680e5 Use pattern information to determine whether the use expects this 
instruction to produce a result. e.g MUL8m, the instruction does not
produce a explicit result. However it produces an implicit result in
AL which would be copied to a temp. The root operator of the matching
pattern is a mul so the use would expect it to produce a result.

llvm-svn: 25458
 2006-01-19 10:12:58 +00:00
Evan Cheng
49fa8f2cea Prevent unnecessary CopyToReg when the same HW register appears in two spots 
in the pattern.

llvm-svn: 25437
 2006-01-19 01:55:45 +00:00
Evan Cheng
e840301269 Emit a type matching check for ComplexPatterns. 
llvm-svn: 25392
 2006-01-17 07:36:41 +00:00
Evan Cheng
ddc62a9b61 Type inferencing bug 
llvm-svn: 25337
 2006-01-15 10:04:45 +00:00
Evan Cheng
dc7ec6c63e Allow transformation from GlobalAddress to TargetGlobalAddress and 
ExternalSymbol to TargetExternalSymbol.

llvm-svn: 25252
 2006-01-12 19:35:54 +00:00
Evan Cheng
bbe910088d GlobalAddress -> TargetGlobalAddress; ExternalSymbol -> TargetExternalSymbol 
llvm-svn: 25245
 2006-01-12 07:54:57 +00:00
Evan Cheng
5fa1397b29 Some minor fixes. 
llvm-svn: 25227
 2006-01-11 22:16:13 +00:00
Chris Lattner
4e465047c1 Always select target registers to themselves 
llvm-svn: 25218
 2006-01-11 19:52:27 +00:00
Chris Lattner
0343518492 Emit an error instead of an assertion if trying to do bogus things in result patterns. 
llvm-svn: 25194
 2006-01-11 01:33:49 +00:00
Evan Cheng
7b8f8c317e * Remove instruction fields hasInFlag / hasOutFlag and added SNDPInFlag and 
SNDPOutFlag to DAG nodes. These properties do not belong to target specific
instructions.
* Added DAG node property SNDPOptInFlag. It's same as SNDPInFlag except it's
optional. Used by ret / call, etc.

llvm-svn: 25154
 2006-01-09 18:27:06 +00:00
Evan Cheng
353958d60c Pattern complexity calculation fix. 
llvm-svn: 25133
 2006-01-06 22:19:44 +00:00
Evan Cheng
1d376c6eb2 Tweak pattern complexity calc. 
llvm-svn: 25122
 2006-01-06 02:30:23 +00:00
Evan Cheng
c6ad7a02a8 Bug fix wrt chain operand. 
llvm-svn: 25115
 2006-01-06 00:41:12 +00:00
Jeff Cohen
2230844c7b Replace fix with one less disruptive to the original code. 
Also note that GCC 4.1 also correctly flags the syntax error.

llvm-svn: 25076
 2006-01-04 03:23:30 +00:00
Jeff Cohen
8c5173a440 Tblgen was generating syntactically illegal C++ code like: 
SDOperand Tmp0,Tmp1,Tmp2,Tmp3,;

GCC has a bug (24907) in which is fails to catch this, but VC++ correctly
notes its illegality, so tblgen must be taught to only generate legal C++.

llvm-svn: 25075
 2006-01-04 03:15:19 +00:00
Chris Lattner
5a6761490a Remove obsolete comment, make things look a bit nicer 
llvm-svn: 25070
 2006-01-04 00:32:01 +00:00
Chris Lattner
ae035f3604 reduce stack usage of the recursive SelectCode function by out-lining each 
case of the switch statement into its own method.

llvm-svn: 25069
 2006-01-04 00:25:00 +00:00
Chris Lattner
f6418363ba Remove my previous ugly hack that tries to reduce the stack space usage 
of SelectCode to make way for a better solution.

llvm-svn: 25068
 2006-01-03 22:55:16 +00:00
Duraid Madina
d3cf232a4f HP-UX DVDs are crunchy and good to eat 
llvm-svn: 25052
 2005-12-30 16:41:48 +00:00
Nate Begeman
ec7c28a28c Add support for generating v4i32 altivec code 
llvm-svn: 25046
 2005-12-30 00:12:56 +00:00
Evan Cheng
231b11ba87 Added field noResults to Instruction. 
Currently tblgen cannot tell which operands in the operand list are results so
it assumes the first one is a result. This is bad. Ideally we would fix this
by separating results from inputs, e.g. (res R32:$dst),
(ops R32:$src1, R32:$src2). But that's a more distruptive change. Adding
'let noResults = 1' is the workaround to tell tblgen that the instruction does
not produces a result. It works for now since tblgen does not support
instructions which produce multiple results.

llvm-svn: 25017
 2005-12-26 09:11:45 +00:00
Andrew Lenharth
b42cc57048 support targetexternalsym 
llvm-svn: 25005
 2005-12-24 23:36:59 +00:00
Evan Cheng
bd79f871a2 * Support for hasInFlag and hasOutFlag (on instructions). Remove nameless FLAG 
support which is fragile.
* Fixed a number of bugs.

llvm-svn: 24996
 2005-12-23 22:11:47 +00:00
Chris Lattner
d752db6276 silence some bogus gcc warnings 
llvm-svn: 24962
 2005-12-22 20:37:36 +00:00
Evan Cheng
b18b8c847f Attempt to fix a crash on WIN32. 
llvm-svn: 24936
 2005-12-22 02:35:21 +00:00
Evan Cheng
578fad3f9d * Added support for FLAG - a special nameless flag register. Can be used as 
either an operand or a result.
* Fixed some more flag / chain bugs.

llvm-svn: 24933
 2005-12-22 02:24:50 +00:00
Evan Cheng
3b09247bb9 Allows instructions which no explicit operands. e.g. X86 RET which has but 
an implicit flag operand.

llvm-svn: 24916
 2005-12-21 20:20:49 +00:00
Chris Lattner
643e6c2b9e Eliminate some GCC warnings from the generated code 
llvm-svn: 24897
 2005-12-21 05:31:05 +00:00
Evan Cheng
4106feae54 Fix the semantic of Requires<[cond]> to mean if (!cond) goto PXXFail; 
llvm-svn: 24883
 2005-12-20 20:08:01 +00:00
Chris Lattner
28cf136707 This ugly patch works around a GCC bug where it is compiling SelectCode to 
use too much stack space, overflowing the stack for large functions.  Instead
of emitting new SDOperands in each match block, we emit some common ones at
the top of SelectCode then reuse them when possible.

This reduces the stack size of SelectCode from 28K to 21K.  Note that GCC
compiles it to 512 bytes :-/

I've filed GCC PR 25505 to track this.

llvm-svn: 24882
 2005-12-20 19:41:03 +00:00
Evan Cheng
98c6b52236 Now support instructions with implicit write to non-flag registers. 
llvm-svn: 24878
 2005-12-20 07:37:41 +00:00
Evan Cheng
63d897b0e2 Lefted out a fix in the previous check in. 
llvm-svn: 24873
 2005-12-20 00:06:17 +00:00
Evan Cheng
e93635d0ac Fix another bug related to chain / flag. 
llvm-svn: 24868
 2005-12-19 22:40:04 +00:00
Evan Cheng
c56f9824db Fixes for a number of bugs: save flag results in CodeGenMap, folded chains 
may not all have ResNo == 0.

llvm-svn: 24858
 2005-12-19 07:18:51 +00:00
Chris Lattner
abadc27396 Handle basic block nodes 
llvm-svn: 24833
 2005-12-18 21:05:44 +00:00
Chris Lattner
5dfbcbb8be More fixes for Selection of copyto/fromreg with a flag 
llvm-svn: 24829
 2005-12-18 15:45:51 +00:00
Chris Lattner
5322894560 Select copytoreg and copyfromreg nodes that have flag operands correctly. 
llvm-svn: 24827
 2005-12-18 15:28:25 +00:00
Evan Cheng
54695fd38d Support for read / write from explicit registers with FlagVT type. 
llvm-svn: 24753
 2005-12-17 01:19:28 +00:00
Evan Cheng
297c23d2e7 Added support to specify predicates. 
llvm-svn: 24715
 2005-12-14 22:02:59 +00:00
Evan Cheng
81f4683257 Skip over srcvalue nodes when generating ISEL code. 
llvm-svn: 24704
 2005-12-14 02:21:57 +00:00
Evan Cheng
518610154b Bug fix: CodeGenMap[N] = ... -> CodeGenMap[N.getValue(0)] = ... 
llvm-svn: 24680
 2005-12-12 23:45:21 +00:00
Evan Cheng
1bc6443c22 At top of generated isel SelectCode() is this: 
if (!N.Val->hasOneUse()) {
    std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(N);
    if (CGMI != CodeGenMap.end()) return CGMI->second;
  }

Suppose a DAG like this:

           X
         ^   ^
        /     \
      USE1    USE2

Suppose USE1 is being selected first and during which X is selected and
returned a new node. After this, USE1 is no longer an use of X. During USE2
selection, X will be selected again since it has only one use!

The fix is to always query CodeGenMap.

llvm-svn: 24679
 2005-12-12 23:22:48 +00:00
Evan Cheng
e7f40a3b8b Bug fix: finding the correct incoming chain for pattern with nested src operand. And a minor change to make output code slightly more readible. 
llvm-svn: 24669
 2005-12-12 19:37:43 +00:00
Nate Begeman
a0e26b25f4 Add support for TargetConstantPool nodes to the dag isel emitter, and use 
them in the PPC backend, to simplify some logic out of Select and
SelectAddr.

llvm-svn: 24657
 2005-12-10 02:36:00 +00:00
Evan Cheng
c8ebe5f6eb Stop emitting a redudant type check for complex pattern node. 
llvm-svn: 24655
 2005-12-10 01:57:33 +00:00
Evan Cheng
8300ae66d1 For instructions which produce no result, e.g. store, chain's Resno == 0. 
llvm-svn: 24652
 2005-12-10 00:09:17 +00:00
Chris Lattner
aaec1f6faa Add a new SDTCisPtrTy constraint, which indicates that an operand must have 
the same type as the pointer type for a target.

llvm-svn: 24649
 2005-12-09 22:57:42 +00:00
Evan Cheng
9586e87904 * Do not allow nodes which produce chain results (e.g. loads) to be folded if 
it has more than one real use (non-chain uses).
* Record folded chain producing node in CodeGenMap.
* Do not fold a chain producing node if it has already been selected as an
  operand of a chain use.

llvm-svn: 24647
 2005-12-09 22:45:35 +00:00