1//===- README.txt - Notes for improving CellSPU-specific code gen ---------===//
2
3This code was contributed by a team from the Computer Systems Research
4Department in The Aerospace Corporation:
5
6- Scott Michel (head bottle washer and much of the non-floating point
7 instructions)
8- Mark Thomas (floating point instructions)
9- Michael AuYeung (intrinsics)
10- Chandler Carruth (LLVM expertise)
11- Nehal Desai (debugging, i32 operations, RoadRunner SPU expertise)
12
13Some minor fixes added by Kalle Raiskila.
14
15THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
17MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT, OR
18OTHERWISE. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE FOR DAMAGES
19OF ANY KIND OR NATURE WHETHER BASED IN CONTRACT, TORT, OR OTHERWISE ARISING
20OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE INCLUDING, WITHOUT
21LIMITATION, DAMAGES RESULTING FROM LOST OR CONTAMINATED DATA, LOST PROFITS OR
22REVENUE, COMPUTER MALFUNCTION, OR FOR ANY SPECIAL, INCIDENTAL, CONSEQUENTIAL,
23OR PUNITIVE DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR
24SUCH DAMAGES ARE FORESEEABLE.
25
26---------------------------------------------------------------------------
27--WARNING--:
28--WARNING--: The CellSPU work is work-in-progress and "alpha" quality code.
29--WARNING--:
30
31If you are brave enough to try this code or help to hack on it, be sure
32to add 'spu' to configure's --enable-targets option, e.g.:
33
34 ./configure <your_configure_flags_here> \
35 --enable-targets=x86,x86_64,powerpc,spu
36
37---------------------------------------------------------------------------
38
39TODO:
40* Create a machine pass for performing dual-pipeline scheduling specifically
41 for CellSPU, and insert branch prediction instructions as needed.
42
43* i32 instructions:
44
45 * i32 division (work-in-progress)
46
47* i64 support (see i64operations.c test harness):
48
49 * shifts and comparison operators: done
50 * sign and zero extension: done
51 * addition: done
52 * subtraction: needed
53 * multiplication: done
54
55* i128 support:
56
57 * zero extension, any extension: done
58 * sign extension: done
59 * arithmetic operators (add, sub, mul, div): needed
60 * logical operations (and, or, shl, srl, sra, xor, nor, nand): needed
61
62 * or: done
63
64* f64 support
65
66 * Comparison operators:
67 SETOEQ unimplemented
68 SETOGT unimplemented
69 SETOGE unimplemented
70 SETOLT unimplemented
71 SETOLE unimplemented
72 SETONE unimplemented
73 SETO done (lowered)
74 SETUO done (lowered)
75 SETUEQ unimplemented
76 SETUGT unimplemented
77 SETUGE unimplemented
78 SETULT unimplemented
79 SETULE unimplemented
80 SETUNE unimplemented
81
82* LLVM vector suport
83
84 * VSETCC needs to be implemented. It's pretty straightforward to code, but
85 needs implementation.
86
87* Intrinsics
88
89 * spu.h instrinsics added but not tested. Need to have an operational
90 llvm-spu-gcc in order to write a unit test harness.
91
92===-------------------------------------------------------------------------===
93