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LLVM backend for 6502
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Andrea Di Biagio 8a712ba229 [X86] Improve the lowering of BITCAST dag nodes from type f64 to type v2i32 (and vice versa). 
Before this patch, the backend always emitted a store+load sequence to
bitconvert from f64 to i64 the input operand of a ISD::BITCAST dag node that
performed a bitconvert from type MVT::f64 to type MVT::v2i32. The resulting
i64 node was then used to build a v2i32 vector.

With this patch, the backend now produces a cheaper SCALAR_TO_VECTOR from
MVT::f64 to MVT::v2f64. That SCALAR_TO_VECTOR is then followed by a "free"
bitcast to type MVT::v4i32. The elements of the resulting
v4i32 are then extracted to build a v2i32 vector (which is illegal and
therefore promoted to MVT::v2i64).

This is in general cheaper than emitting a stack store+load sequence
to bitconvert the operand from type f64 to type i64.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208107 91177308-0d34-0410-b5e6-96231b3b80d8
2014-05-06 17:09:03 +00:00
autoconf ARM64: initial backend import 2014-03-29 10:18:08 +00:00
bindings [OCaml] Add an ocamlfind package llvm.all_backends. 2014-05-01 21:00:52 +00:00
cmake Disable -Wcomment when building with GCC. 2014-05-06 09:46:06 +00:00
docs Implememting named register intrinsics 2014-05-06 16:51:25 +00:00
examples Try to fix the msvc build. 2014-04-29 23:37:02 +00:00
include Implememting named register intrinsics 2014-05-06 16:51:25 +00:00
lib [X86] Improve the lowering of BITCAST dag nodes from type f64 to type v2i32 (and vice versa). 2014-05-06 17:09:03 +00:00
projects Remove projects/sample. 2014-03-12 22:40:22 +00:00
test [X86] Improve the lowering of BITCAST dag nodes from type f64 to type v2i32 (and vice versa). 2014-05-06 17:09:03 +00:00
tools Have the SubtargetFeature help routine just not return a number and 2014-05-06 16:29:50 +00:00
unittests Disable -Wcomment when building with GCC. 2014-05-06 09:46:06 +00:00
utils AArch64/ARM64: implement diagnosis of unpredictable loads & stores 2014-05-06 14:15:14 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.gitignore Remove projects/sample. 2014-03-12 22:40:22 +00:00
CMakeLists.txt Added Sphinx documentation generation to CMake build system. 2014-04-18 21:45:25 +00:00
CODE_OWNERS.TXT ARM Linux support 2014-04-02 23:03:28 +00:00
configure ARM64: initial backend import 2014-03-29 10:18:08 +00:00
CREDITS.TXT Test commit. 2014-04-10 22:25:51 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in Add a --enable-clang-plugin-support option to configure. 2014-03-10 16:58:35 +00:00
Makefile.rules [Build] Add rule to generate fully-expanded .td file 2014-05-06 03:49:45 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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documentation setup.

If you're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.