4108bb01cf
Don't call SelectionDAG.getRoot() directly, go through a forwarding method.
...
llvm-svn: 19642
2005-01-17 19:43:36 +00:00
e3c2cf4854
Implement a target independent optimization to codegen arguments only into
...
the basic block that uses them if possible. This is a big win on X86, as it
lets us fold the argument loads into instructions and reduce register pressure
(by not loading all of the arguments in the entry block).
For this (contrived to show the optimization) testcase:
int %argtest(int %A, int %B) {
%X = sub int 12345, %A
br label %L
L:
%Y = add int %X, %B
ret int %Y
}
we used to produce:
argtest:
mov %ECX, DWORD PTR [%ESP + 4]
mov %EAX, 12345
sub %EAX, %ECX
mov %EDX, DWORD PTR [%ESP + 8]
.LBBargtest_1: # L
add %EAX, %EDX
ret
now we produce:
argtest:
mov %EAX, 12345
sub %EAX, DWORD PTR [%ESP + 4]
.LBBargtest_1: # L
add %EAX, DWORD PTR [%ESP + 8]
ret
This also fixes the FIXME in the code.
BTW, this occurs in real code. 164.gzip shrinks from 8623 to 8608 lines of
.s file. The stack frame in huft_build shrinks from 1644->1628 bytes,
inflate_codes shrinks from 116->108 bytes, and inflate_block from 2620->2612,
due to fewer spills.
Take that alkis. :-)
llvm-svn: 19639
2005-01-17 17:55:19 +00:00
16f64df93a
Refactor code into a new method.
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llvm-svn: 19635
2005-01-17 17:15:02 +00:00
897cd7dc0a
add method stub
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llvm-svn: 19612
2005-01-16 07:28:41 +00:00
209f585033
Add support for promoted registers being live across blocks.
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llvm-svn: 19595
2005-01-16 02:23:07 +00:00
d58384fca6
Use the new TLI method to get this.
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llvm-svn: 19582
2005-01-16 01:11:19 +00:00
a8d34fb8c6
Add support for targets that require promotions.
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llvm-svn: 19579
2005-01-16 00:37:38 +00:00
1001c6e2cd
Add new SIGN_EXTEND_INREG, ZERO_EXTEND_INREG, and FP_ROUND_INREG operators.
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llvm-svn: 19568
2005-01-15 06:17:04 +00:00
3b8e719d1d
Adjust to CopyFromReg changes, implement deletion of truncating/extending
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stores/loads.
llvm-svn: 19562
2005-01-14 22:38:01 +00:00
e727af06c8
Add new ImplicitDef node, rename CopyRegSDNode class to RegSDNode.
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llvm-svn: 19535
2005-01-13 20:50:02 +00:00
2451684678
Don't forget the existing root.
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llvm-svn: 19531
2005-01-13 19:53:14 +00:00
718b5c2f82
Codegen independent ops as being independent.
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llvm-svn: 19528
2005-01-13 17:59:43 +00:00
e05a461f1d
Add an option to view the selection dags as they are generated.
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llvm-svn: 19498
2005-01-12 03:41:21 +00:00
613f79fcbb
add an assertion, avoid creating copyfromreg/copytoreg pairs that are the
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same for PHI nodes.
llvm-svn: 19484
2005-01-11 22:03:46 +00:00
875def9b71
Turn memset/memcpy/memmove into the corresponding operations.
...
llvm-svn: 19463
2005-01-11 05:56:49 +00:00
a2c5d9168c
Handle static alloca arguments to PHI nodes.
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llvm-svn: 19409
2005-01-09 01:16:24 +00:00
58cfd7945d
Use new interfaces to correctly lower varargs and return/frame address intrinsics.
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llvm-svn: 19407
2005-01-09 00:00:49 +00:00
18d2b34637
Add support for llvm.setjmp and longjmp. Only 3 SingleSource/UnitTests fail now.
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llvm-svn: 19404
2005-01-08 22:48:57 +00:00
d006195517
Silence VS warnings.
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llvm-svn: 19384
2005-01-08 19:52:31 +00:00
1f45cd7418
Adjust to changes in LowerCAllTo interfaces
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llvm-svn: 19374
2005-01-08 19:26:18 +00:00
2a6db3c351
Add support for FP->INT conversions and back.
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llvm-svn: 19369
2005-01-08 08:08:56 +00:00
19a83990e1
Implement support for long GEP indices on 32-bit archs and support for
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int GEP indices on 64-bit archs.
llvm-svn: 19354
2005-01-07 21:56:57 +00:00
8ea875fb05
Fix handling of dead PHI nodes.
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llvm-svn: 19349
2005-01-07 21:34:19 +00:00
7a60d91953
Initial implementation of the SelectionDAGISel class. This contains most
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of the code for lowering from LLVM code to a SelectionDAG.
llvm-svn: 19331
2005-01-07 07:47:53 +00:00
Chris Lattner