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