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LLVM backend for 6502
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8b8a636843
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Bill Wendling 8b8a636843 Implement a special algorithm for converting uint_to_fp for i32 values on 
X86. This code:

void f() {
  uint32_t x;
  float y = (float)x;
}

used to be:

     movl     %eax, -8(%ebp)
     movl     [2^52 double], -4(%ebp)
     movsd    -8(%ebp), %xmm0
     subsd    [2^52 double], %xmm0
     cvtsd2ss %xmm0, %xmm0

Is now:

   movsd        [2^52 double], %xmm0
   movsd        %xmm0, %xmm1
   movd         %ecx, %xmm2
   orps         %xmm2, %xmm1
   subsd        %xmm0, %xmm1
   cvtsd2ss     %xmm1, %xmm0

This is faster on X86. Note that there's an extra load of %xmm0 into %xmm1. That
will be fixed in a later coalescer fix.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62404 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-17 03:56:04 +00:00
autoconf Modify the unittests Makefiles so that they don't rebuild parts of LLVM just to 2009-01-04 23:12:21 +00:00
bindings Rename getABITypeSize to getTypePaddedSize, as 2009-01-12 20:38:59 +00:00
cmake CMake: replace `rm' with portable invocations of cmake. 2009-01-07 19:24:44 +00:00
docs Support for multi-valued options in CommandLine 2009-01-16 22:54:19 +00:00
examples
include introduce typedef for complicated vector, and use it too 2009-01-17 00:09:08 +00:00
lib Implement a special algorithm for converting uint_to_fp for i32 values on 2009-01-17 03:56:04 +00:00
projects
runtime
test Simplify extract element of a scalar to vector. 2009-01-17 00:07:25 +00:00
tools Registry.h should not depend on CommandLine.h. 2009-01-16 07:02:28 +00:00
unittests Fix naming of file. 2009-01-11 01:25:51 +00:00
utils Avoid triggering an assertion failure when an instruction pattern 2009-01-16 21:30:55 +00:00
website
win32
Xcode
build-for-llvm-top.sh
CMakeLists.txt
configure Regenerate. 2009-01-04 23:12:30 +00:00
CREDITS.TXT * Moved author attribution to CREDITS.TXT 2009-01-08 16:40:25 +00:00
LICENSE.TXT Renamed Google Test license file from COPYING to LICENSE.TXT to match LLVM 2009-01-05 17:42:15 +00:00
llvm.spec.in
Makefile Removed trailing whitespace. 2009-01-08 02:11:55 +00:00
Makefile.common Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
Makefile.config.in Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
Makefile.rules Support llvmc plugins in out-of-tree projects. 2009-01-09 16:31:01 +00:00
ModuleInfo.txt
README.txt

README.txt 

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

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