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LLVM backend for 6502
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Jakob Stoklund Olesen 4a0a18af4a Permit remat of partial register defs when it is safe. 
An instruction may define part of a register where the other bits are
undefined. In that case, it is safe to rematerialize the instruction.
For example:

  %vreg2:ssub_0<def> = VLDRS <cp#0>, 0, pred:14, pred:%noreg, %vreg2<imp-def>

The extra <imp-def> operand indicates that the instruction does not read
the other parts of the virtual register, so a remat is safe.

This patch simply allows multiple def operands for the virtual register.
It is MI->readsVirtualRegister() that determines if we depend on a
previous value so remat is impossible.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138953 91177308-0d34-0410-b5e6-96231b3b80d8
2011-09-01 18:27:51 +00:00
autoconf Update config.sub, config.guess and configure. 2011-08-23 06:43:49 +00:00
bindings Remove the build_unwind function from the OCaml bindings. 2011-08-10 01:10:17 +00:00
cmake CMake: [MSVC] Suppress C4551 'function call missing argument list'. 2011-08-17 01:28:30 +00:00
docs Remove the old tail duplication pass. It is not used and is unable to update 2011-08-30 23:03:45 +00:00
examples Move TargetRegistry and TargetSelect from Target to Support where they belong. 2011-08-24 18:08:43 +00:00
include Remove the old tail duplication pass. It is not used and is unable to update 2011-08-30 23:03:45 +00:00
lib Permit remat of partial register defs when it is safe. 2011-09-01 18:27:51 +00:00
projects
runtime
test Permit remat of partial register defs when it is safe. 2011-09-01 18:27:51 +00:00
tools Teach macho-dump to dump the uleb128s referred to by linkedit_data segments. 2011-08-30 22:10:58 +00:00
unittests Fix C++0x narrowing errors when char is unsigned. 2011-08-30 20:53:29 +00:00
utils Fix up r137380 based on post-commit review by Jim Grosbach. 2011-09-01 18:02:14 +00:00
website
.gitignore .gitignore: Ignore /autom4te.cache. We can execute "PATH=/path/to/autotools/bin autoconf/AutoRegen.sh". 2011-08-12 07:47:50 +00:00
build-for-llvm-top.sh
CMakeLists.txt
configure Update config.sub, config.guess and configure. 2011-08-23 06:43:49 +00:00
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