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LLVM backend for 6502
If we have an add (or an or that is really an add), where one operand is a FrameIndex and the other operand is a small constant, we can combine the lowering of the FrameIndex (which is lowered as an add of the FI and a zero offset) with the constant operand. Amusingly, this is an old potential improvement entry from lib/Target/PowerPC/README.txt which had never been resolved. In short, we used to lower: %X = alloca { i32, i32 } %Y = getelementptr {i32,i32}* %X, i32 0, i32 1 ret i32* %Y as: addi 3, 1, -8 ori 3, 3, 4 blr and now we produce: addi 3, 1, -4 blr which is much more sensible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224071 91177308-0d34-0410-b5e6-96231b3b80d8 |
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autoconf | ||
bindings | ||
cmake | ||
docs | ||
examples | ||
include | ||
lib | ||
projects | ||
test | ||
tools | ||
unittests | ||
utils | ||
.arcconfig | ||
.clang-format | ||
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.gitignore | ||
CMakeLists.txt | ||
CODE_OWNERS.TXT | ||
configure | ||
CREDITS.TXT | ||
LICENSE.TXT | ||
llvm.spec.in | ||
LLVMBuild.txt | ||
Makefile | ||
Makefile.common | ||
Makefile.config.in | ||
Makefile.rules | ||
README.txt |
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