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01cdb1b367
llvm-6502/lib/Target/X86
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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
..
.cvsignore Tell CVS to ignore all .inc files 2003-08-03 15:50:17 +00:00
FloatingPoint.cpp Fix bug in previous checkin 2004-06-11 05:22:44 +00:00
InstSelectPattern.cpp Clean up a lot of the code I added yesterday by exposing the IntrinsicLowering 2003-12-28 21:23:38 +00:00
InstSelectSimple.cpp By far, one of the most common uses of isnan is to make 'isunordered' 2004-06-11 05:33:49 +00:00
Makefile Tablgen files for really simple instruction selector 2004-04-06 19:34:00 +00:00
PeepholeOptimizer.cpp Convert to the new TargetMachine interface. 2004-06-02 05:55:25 +00:00
Printer.cpp Convert to the new TargetMachine interface. 2004-06-02 05:55:25 +00:00
X86.h Tablgen files for really simple instruction selector 2004-04-06 19:34:00 +00:00
X86.td Add support for the printImplicitDefsBefore flag 2004-04-13 17:18:39 +00:00
X86AsmPrinter.cpp Convert to the new TargetMachine interface. 2004-06-02 05:55:25 +00:00
X86CodeEmitter.cpp Convert to the new TargetMachine interface. 2004-06-02 05:55:25 +00:00
X86FloatingPoint.cpp Fix bug in previous checkin 2004-06-11 05:22:44 +00:00
X86InstrBuilder.h Add assertion for scale verification. 2004-03-04 18:05:02 +00:00
X86InstrInfo.cpp A big X86 instruction rename. The instructions are renamed to make 2004-02-29 08:50:03 +00:00
X86InstrInfo.h Introduce a new FP instruction type to separate the compare cases from the 2004-06-11 04:41:24 +00:00
X86InstrInfo.td No really, these are dead now 2004-06-11 04:50:14 +00:00
X86InstrSel.td Tablgen files for really simple instruction selector 2004-04-06 19:34:00 +00:00
X86InstrSelInfo.td Tablgen files for really simple instruction selector 2004-04-06 19:34:00 +00:00
X86ISelPattern.cpp Clean up a lot of the code I added yesterday by exposing the IntrinsicLowering 2003-12-28 21:23:38 +00:00
X86ISelSimple.cpp By far, one of the most common uses of isnan is to make 'isunordered' 2004-06-11 05:33:49 +00:00
X86JITInfo.h Clean up a lot of the code I added yesterday by exposing the IntrinsicLowering 2003-12-28 21:23:38 +00:00
X86PeepholeOpt.cpp Convert to the new TargetMachine interface. 2004-06-02 05:55:25 +00:00
X86RegisterInfo.cpp Add support for the setp instructions 2004-06-11 04:30:06 +00:00
X86RegisterInfo.h Another API change to MRegisterInfo::foldMemoryOperand. Instead of a 2004-03-14 20:14:27 +00:00
X86RegisterInfo.td Improve allocation order: 2004-02-29 09:17:01 +00:00
X86SimpInstrSelector.cpp Now that compare instructions aren't lumped in with the other twoargfp instructions, 2004-06-11 04:49:02 +00:00
X86TargetMachine.cpp Fix the fixed stack offset, patch contributed by Vladimir Prus 2004-06-10 06:19:25 +00:00
X86TargetMachine.h Convert to the new TargetMachine interface. 2004-06-02 05:55:25 +00:00