Add Intel encodings for the fcmp instruction.

Not all floating point condition codes are directly supported by the
ucimiss/ucomisd instructions. Some inequalities need to be reversed and
eq+ne require two separate tests.

lib/cretonne/meta/isa/intel/defs.py

@@ -7,9 +7,22 @@ from __future__ import absolute_import
 from cdsl.isa import TargetISA, CPUMode
 import base.instructions
 from . import instructions as x86
+from base.immediates import floatcc
 
 ISA = TargetISA('intel', [base.instructions.GROUP, x86.GROUP])
 
 # CPU modes for 32-bit and 64-bit operation.
 I64 = CPUMode('I64', ISA)
 I32 = CPUMode('I32', ISA)
+
+# The set of floating point condition codes that are directly supported.
+# Other condition codes need to be reversed or expressed as two tests.
+supported_floatccs = [
+        floatcc.ord,
+        floatcc.uno,
+        floatcc.one,
+        floatcc.ueq,
+        floatcc.gt,
+        floatcc.ge,
+        floatcc.ult,
+        floatcc.ule]