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LLVM backend for 6502
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668f7ac9e4
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Victor Umansky 668f7ac9e4 Fix for the following bug in AVX codegen for double-to-int conversions: 
.	"fptosi" and "fptoui" IR instructions are defined with round-to-zero rounding mode.
.	Currently for AVX mode for <4xdouble> and <8xdouble>  the "VCVTPD2DQ.128" and "VCVTPD2DQ.256" instructions are selected (for .fp_to_sint. DAG node operation ) by AVX codegen. However they use round-to-nearest-even rounding mode.
.	Consequently, the conversion produces incorrect numbers.
 
The fix is to replace selection of VCVTPD2DQ instructions with VCVTTPD2DQ instructions. The latter use truncate (i.e. round-to-zero) rounding mode. 
As .fp_to_sint. DAG node operation is used only for lowering of  "fptosi" and "fptoui" IR instructions, the fix in X86InstrSSE.td definition file doesn.t have an impact on other LLVM flows.
 
The patch includes changes in the .td file, LIT test for the changes and a fix in a legacy LIT test (which produced asm code conflicting with LLVN IR spec). 



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149056 91177308-0d34-0410-b5e6-96231b3b80d8
2012-01-26 08:51:39 +00:00
autoconf Makefile: add missing files to FilesToConfig 2012-01-17 02:56:49 +00:00
bindings Tidy up. s/Low Level Virtual Machine/LLVM/. 2012-01-25 22:00:23 +00:00
cmake -fvisibility-inlines-hidden is a c++ only option. 2012-01-25 03:39:26 +00:00
docs Tidy up. s/Low Level Virtual Machine/LLVM/. 2012-01-25 22:00:23 +00:00
examples
include eliminate the Constant::getVectorElements method. There are better (and 2012-01-26 02:51:13 +00:00
lib Fix for the following bug in AVX codegen for double-to-int conversions: 2012-01-26 08:51:39 +00:00
projects revert r147542 after comments from Joerg Sonnenberger 2012-01-05 18:28:46 +00:00
runtime
test Fix for the following bug in AVX codegen for double-to-int conversions: 2012-01-26 08:51:39 +00:00
tools llvm-config: Add support for CMake build trees in which the build 2012-01-26 01:31:38 +00:00
unittests Additional methods for SmallString. 2012-01-24 23:43:59 +00:00
utils Tidy up. Trailing whitespace. 2012-01-24 21:06:59 +00:00
.gitignore
CMakeLists.txt
configure revert r147542 after comments from Joerg Sonnenberger 2012-01-05 18:28:46 +00:00
CREDITS.TXT
LICENSE.TXT
llvm.spec.in Tidy up. s/Low Level Virtual Machine/LLVM/. 2012-01-25 22:00:23 +00:00
LLVMBuild.txt
Makefile Makefile: add missing files to FilesToConfig 2012-01-17 02:56:49 +00:00
Makefile.common
Makefile.config.in
Makefile.rules
README.txt

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