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LLVM backend for 6502
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c143dd4f63
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Evan Cheng c143dd4f63 Fix buggy fcopysign lowering. 
This
define float @foo(float %x, float %y) nounwind readnone {
entry:
  %0 = tail call float @copysignf(float %x, float %y) nounwind readnone
  ret float %0
}

Was compiled to:
    vmov     s0, r1
    bic      r0, r0, #-2147483648
    vmov     s1, r0
    vcmpe.f32    s0, #0
    vmrs         apsr_nzcv, fpscr
    it           lt
    vneglt.f32   s1, s1
    vmov         r0, s1
    bx           lr

This fails to copy the sign of -0.0f because it's lost during the float to int
conversion. Also, it's sub-optimal when the inputs are in GPR registers.

Now it uses integer and + or operations when it's profitable. And it's correct!
    lsrs    r1, r1, #31
    bfi     r0, r1, #31, #1
    bx      lr
rdar://8984306


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125357 91177308-0d34-0410-b5e6-96231b3b80d8
2011-02-11 02:28:55 +00:00
autoconf lib/Support/Errno.cpp: Check strerror_s() with HAVE_DECL_STRERROR_S in config.h.*. 2011-02-09 04:18:48 +00:00
bindings Fix compiling the ocaml kaleidoscope tutorials 2011-02-09 18:32:02 +00:00
cmake CMake: LLVM_LIT_TOOLS_DIR is needed only on Win32 hosts to use GnuWin32 tools. 2011-02-10 10:29:42 +00:00
docs Don't run ocamldoc if it's not installed 2011-02-09 18:32:04 +00:00
examples Fix compiling the ocaml kaleidoscope tutorials 2011-02-09 18:32:02 +00:00
include Remove trailing whitespace. 2011-02-11 01:21:00 +00:00
lib Fix buggy fcopysign lowering. 2011-02-11 02:28:55 +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 Fix buggy fcopysign lowering. 2011-02-11 02:28:55 +00:00
tools CMake: LLVM_NO_RTTI must be obsolete now! 2011-02-10 09:13:39 +00:00
unittests build: Add MAKEFILE_UNITTEST_NO_INCLUDE_COMMON build variable, to be leveraged 2011-02-04 17:12:18 +00:00
utils lit/TestFormats.py: Unittests may be found with suffix .exe also on Cygwin. 2011-02-10 09:11:57 +00:00
website
.gitignore Cleanup and document .gitignore. 2010-12-17 17:22:50 +00:00
build-for-llvm-top.sh
CMakeLists.txt Moved more stuff to HandleLLVMOptions.cmake 2011-02-05 19:08:42 +00:00
configure lib/Support/Errno.cpp: Check strerror_s() with HAVE_DECL_STRERROR_S in config.h.*. 2011-02-09 04:18:48 +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
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 Factor the computation of the basename of libraries. This avoids renaming 2011-02-03 22:01:15 +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

README.txt 

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================================

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