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LLVM backend for 6502
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b990a2f249
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Evan Cheng b990a2f249 Teach two-address pass to do some coalescing while eliminating REG_SEQUENCE 
instructions.

e.g.
%reg1026<def> = VLDMQ %reg1025<kill>, 260, pred:14, pred:%reg0
%reg1027<def> = EXTRACT_SUBREG %reg1026, 6
%reg1028<def> = EXTRACT_SUBREG %reg1026<kill>, 5
...
%reg1029<def> = REG_SEQUENCE %reg1028<kill>, 5, %reg1027<kill>, 6, %reg1028, 7, %reg1027, 8, %reg1028, 9, %reg1027, 10, %reg1030<kill>, 11, %reg1032<kill>, 12

After REG_SEQUENCE is eliminated, we are left with:

%reg1026<def> = VLDMQ %reg1025<kill>, 260, pred:14, pred:%reg0
%reg1029:6<def> = EXTRACT_SUBREG %reg1026, 6
%reg1029:5<def> = EXTRACT_SUBREG %reg1026<kill>, 5

The regular coalescer will not be able to coalesce reg1026 and reg1029 because it doesn't
know how to combine sub-register indices 5 and 6. Now 2-address pass will consult the
target whether sub-registers 5 and 6 of reg1026 can be combined to into a larger
sub-register (or combined to be reg1026 itself as is the case here). If it is possible, 
it will be able to replace references of reg1026 with reg1029 + the larger sub-register
index.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103835 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-14 23:21:14 +00:00
autoconf Add new configure option, --disable-timestamps, intended to turn off anything which would mess up binary/object comparisons. Currently: 2010-05-10 20:11:56 +00:00
bindings add attributes and module level asm to the ocaml bindings, 2010-04-10 17:52:58 +00:00
cmake Tell Valgrind when we modify already-executed machine code so it knows 2010-03-15 04:57:55 +00:00
docs I got tired of VISIBILITY_HIDDEN colliding with the gcc enum. Rename it 2010-05-11 20:16:09 +00:00
examples Remove the -enable-sjlj-eh option, which doesn't do anything. 2010-05-02 15:36:26 +00:00
include Teach two-address pass to do some coalescing while eliminating REG_SEQUENCE 2010-05-14 23:21:14 +00:00
lib Teach two-address pass to do some coalescing while eliminating REG_SEQUENCE 2010-05-14 23:21:14 +00:00
projects
runtime Delete a blank line. 2010-04-16 13:32:55 +00:00
test SystemZ really does mean "has calls" and not just "adjusts stack." Go ahead and 2010-05-14 22:17:42 +00:00
tools Use regular PassManager instead of FunctionPassManager in opt, since it 2010-05-14 15:36:54 +00:00
unittests Fix const ilist_node::get{Prev,Next}Node() to actually compile. Picky, picky. 2010-05-13 18:35:02 +00:00
utils Added a QQQQ register file to model 4-consecutive Q registers. 2010-05-14 02:13:41 +00:00
website
build-for-llvm-top.sh
CMakeLists.txt CMake: Add options for using static runtime on MSVC++ build. 2010-03-18 13:52:05 +00:00
configure Add new configure option, --disable-timestamps, intended to turn off anything which would mess up binary/object comparisons. Currently: 2010-05-10 20:11:56 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in
Makefile Update for CIndex rename. 2010-04-30 23:36:47 +00:00
Makefile.common
Makefile.config.in Add new configure option, --disable-timestamps, intended to turn off anything which would mess up binary/object comparisons. Currently: 2010-05-10 20:11:56 +00:00
Makefile.rules Add new configure option, --disable-timestamps, intended to turn off anything which would mess up binary/object comparisons. Currently: 2010-05-10 20:11:56 +00:00
ModuleInfo.txt
README.txt Give packagers some advice about how to build LLVM so it's useful to 2010-02-26 00:54:42 +00:00

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