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LLVM backend for 6502
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4662a9f270
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Jakob Stoklund Olesen 4662a9f270 Allow coalescing with reserved physregs in certain cases: 
When a virtual register has a single value that is defined as a copy of a
reserved register, permit that copy to be joined. These virtual register are
usually copies of the stack pointer:

  %vreg75<def> = COPY %ESP; GR32:%vreg75
  MOV32mr %vreg75, 1, %noreg, 0, %noreg, %vreg74<kill>
  MOV32mi %vreg75, 1, %noreg, 8, %noreg, 0
  MOV32mi %vreg75<kill>, 1, %noreg, 4, %noreg, 0
  CALLpcrel32 ...

Coalescing these virtual registers early decreases register pressure.
Previously, they were coalesced by RALinScan::attemptTrivialCoalescing after
register allocation was completed.

The lower register pressure causes the mcinst-lowering-cmp0.ll test case to fail
because it depends on linear scan spilling a particular register.

I am deleting 2008-08-05-SpillerBug.ll because it is counting the number of
instructions emitted, and its revision history shows the 'correct' count being
edited many times.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128845 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-04 21:00:03 +00:00
autoconf Check that the AsmParser exists for the native target to enable initialization 2011-03-14 22:12:35 +00:00
bindings Fix compiling the ocaml kaleidoscope tutorials 2011-02-09 18:32:02 +00:00
cmake Fix typos on LLVM.cmake. Export LLVM_ON_UNIX & LLVM_ON_WIN32. 2011-04-03 16:12:38 +00:00
docs Dragonegg release notes. 2011-04-04 11:09:08 +00:00
examples Remove PHINode::reserveOperandSpace(). Instead, add a parameter to 2011-03-30 11:28:46 +00:00
include Stop caching basic block index ranges now that SlotIndexes can keep up. 2011-04-04 15:32:15 +00:00
lib Allow coalescing with reserved physregs in certain cases: 2011-04-04 21:00:03 +00:00
projects Regen configure 2010-12-12 21:42:01 +00:00
runtime Implementation of path profiling. 2011-01-29 01:09:53 +00:00
test Allow coalescing with reserved physregs in certain cases: 2011-04-04 21:00:03 +00:00
tools Update BreakpointPrinter to emit original function names only. 2011-04-04 19:51:17 +00:00
unittests While testing dragonegg I noticed that isCastable and getCastOpcode 2011-04-01 03:34:54 +00:00
utils Add support for the VIA PadLock instructions. 2011-04-04 16:58:13 +00:00
website
.gitignore Cleanup and document .gitignore. 2010-12-17 17:22:50 +00:00
build-for-llvm-top.sh Patch to build llvm with srcdir != objdir from 2009-01-23 08:42:38 +00:00
CMakeLists.txt Supports building with a list of targets that does not contain 2011-03-23 17:42:13 +00:00
configure Check that the AsmParser exists for the native target to enable initialization 2011-03-14 22:12:35 +00:00
CREDITS.TXT Another git svn dcommit test. This time let's hope it doesn't kill my repo. 2010-12-10 14:45:10 +00:00
LICENSE.TXT 2010 is upon us. 2010-01-09 18:40:31 +00:00
llvm.spec.in
Makefile Merge System into Support. 2010-11-29 18:16:10 +00:00
Makefile.common Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
Makefile.config.in autoconf: Add --disable-embed-stdcxx to suppress linking libstdc++.a into llvm.dll with --enable-shared on Cygming. 2010-12-29 03:59:14 +00:00
Makefile.rules Makefile.rules: [PR2928] "make install" may install include files along explicit pattern, not to install CMake's building stuff. 2011-03-09 09:11:27 +00:00
ModuleInfo.txt Remove trailing space. This is just an excuse to poke the 2010-10-05 20:32:15 +00:00
README.txt Test commit. 2011-02-11 19:11:57 +00:00

README.txt 

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