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LLVM backend for 6502
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01cdb1b367
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Chris Lattner 01cdb1b367 By far, one of the most common uses of isnan is to make 'isunordered' 
comparisons.  In an 'isunordered' predicate, which looks like this at
the LLVM level:

        %a = call bool %llvm.isnan(double %X)
        %b = call bool %llvm.isnan(double %Y)
        %COM = or bool %a, %b

We used to generate this code:

        fxch %ST(1)
        fucomip %ST(0), %ST(0)
        setp %AL
        fucomip %ST(0), %ST(0)
        setp %AH
        or %AL, %AH

With this patch, we generate this code:

        fucomip %ST(0), %ST(1)
        fstp %ST(0)
        setp %AL

Which should make alkis happy.  Tested as X86/compare_folding.llx:test1


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14148 91177308-0d34-0410-b5e6-96231b3b80d8
2004-06-11 05:33:49 +00:00
autoconf Added checks for mkstemp and getrusage. 2004-06-07 14:26:24 +00:00
docs Bug fixed, new feature 2004-06-11 04:35:21 +00:00
examples/ModuleMaker Configure script for ModuleMaker. 2003-11-25 20:02:07 +00:00
include Revert an unneeded interface change to Instruction.h 2004-06-11 03:06:43 +00:00
lib By far, one of the most common uses of isnan is to make 'isunordered' 2004-06-11 05:33:49 +00:00
projects Add support for dos-style files 2004-05-27 18:28:32 +00:00
runtime Continue the implementation 2004-05-27 05:51:31 +00:00
test Test that the X86 backend is only emitting one fucom instruction 2004-06-11 05:30:34 +00:00
tools Clean up documentation and naming of variables. 2004-06-10 18:38:44 +00:00
utils Allow dates with slashes in them in $DateRE. 2004-06-10 07:44:28 +00:00
.cvsignore Ok, try #2, this time I'll not be stupid 2003-08-03 18:33:24 +00:00
configure Added checks for mkstemp and getrusage. 2004-06-07 14:26:24 +00:00
CREDITS.TXT Just testing the "Reid has CVS commit access" system 2004-05-06 18:06:18 +00:00
LICENSE.TXT Add spiff 2004-06-01 20:37:41 +00:00
llvm.spec RPM spec file for LLVM tools and libraries. 2004-02-10 03:57:51 +00:00
llvm.spec.in RPM spec file for LLVM tools and libraries. 2004-02-10 03:57:51 +00:00
Makefile Change tags rule to pipe output from find through etags command so that it 2004-06-11 03:10:27 +00:00
Makefile.common Standardize header comments of top-level Makefiles. 2004-04-24 00:10:56 +00:00
Makefile.config.in Added the EXEEXT variable so that Makefiles can figure out what extension 2004-06-01 19:04:38 +00:00
Makefile.rules Explicitly specify libtool tag "CXX" so that if you setenv CXX to something 2004-06-08 18:52:45 +00:00
README.txt This file has been superseded by docs/index.html . 2004-05-12 02:48:30 +00:00

README.txt 

This file is a placeholder; see docs/index.html for documentation.