1 //===- README.txt - Notes for improving CellSPU-specific code gen ---------===//
3 This code was contributed by a team from the Computer Systems Research
4 Department in The Aerospace Corporation:
6 - Scott Michel (head bottle washer and much of the non-floating point
8 - Mark Thomas (floating point instructions)
9 - Michael AuYeung (intrinsics)
10 - Chandler Carruth (LLVM expertise)
11 - Nehal Desai (debugging, i32 operations, RoadRunner SPU expertise)
13 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
15 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NONINFRINGEMENT, OR
16 OTHERWISE. IN NO EVENT SHALL THE AEROSPACE CORPORATION BE LIABLE FOR DAMAGES
17 OF ANY KIND OR NATURE WHETHER BASED IN CONTRACT, TORT, OR OTHERWISE ARISING
18 OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE INCLUDING, WITHOUT
19 LIMITATION, DAMAGES RESULTING FROM LOST OR CONTAMINATED DATA, LOST PROFITS OR
20 REVENUE, COMPUTER MALFUNCTION, OR FOR ANY SPECIAL, INCIDENTAL, CONSEQUENTIAL,
21 OR PUNITIVE DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES OR
22 SUCH DAMAGES ARE FORESEEABLE.
24 ---------------------------------------------------------------------------
26 --WARNING--: The CellSPU work is work-in-progress and "alpha" quality code.
29 If you are brave enough to try this code or help to hack on it, be sure
30 to add 'spu' to configure's --enable-targets option, e.g.:
32 ./configure <your_configure_flags_here> \
33 --enable-targets=x86,x86_64,powerpc,spu
35 ---------------------------------------------------------------------------
38 * Create a machine pass for performing dual-pipeline scheduling specifically
39 for CellSPU, and insert branch prediction instructions as needed.
43 * i32 division (work-in-progress)
45 * i64 support (see i64operations.c test harness):
47 * shifts and comparison operators: done
48 * sign and zero extension: done
51 * multiplication: done
55 * zero extension, any extension: done
56 * sign extension: needed
57 * arithmetic operators (add, sub, mul, div): needed
58 * logical operations (and, or, shl, srl, sra, xor, nor, nand): needed
64 * Comparison operators:
82 * VSETCC needs to be implemented. It's pretty straightforward to code, but
87 * spu.h instrinsics added but not tested. Need to have an operational
88 llvm-spu-gcc in order to write a unit test harness.
90 ===-------------------------------------------------------------------------===