Add a trapff instruction.

This is the floating point equivalent of trapif: Trap when a given
condition is in the floating-point flags.

Define Intel encodings comparable to the trapif encodings.

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

@@ -357,6 +357,8 @@ I64.enc(base.trap, *r.trap(0x0f, 0x0b))
 # Using a standard EncRecipe, not the TailRecipe.
 I32.enc(base.trapif, r.trapif, 0)
 I64.enc(base.trapif, r.trapif, 0)
+I32.enc(base.trapff, r.trapff, 0)
+I64.enc(base.trapff, r.trapff, 0)
 
 #
 # Comparisons

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

@@ -8,7 +8,7 @@ from cdsl.registers import RegClass
 from base.formats import Unary, UnaryImm, Binary, BinaryImm, MultiAry, NullAry
 from base.formats import Trap, Call, IndirectCall, Store, Load
 from base.formats import IntCompare, FloatCompare, IntCond, FloatCond
-from base.formats import IntSelect, IntCondTrap
+from base.formats import IntSelect, IntCondTrap, FloatCondTrap
 from base.formats import Jump, Branch, BranchInt, BranchFloat
 from base.formats import Ternary, FuncAddr, UnaryGlobalVar
 from base.formats import RegMove, RegSpill, RegFill, CopySpecial
@@ -292,6 +292,20 @@ trapif = EncRecipe(
         sink.put1(0x0b);
         ''')
 
+trapff = EncRecipe(
+        'trapff', FloatCondTrap, size=4, ins=FLAG.eflags, outs=(),
+        clobbers_flags=False,
+        instp=floatccs(FloatCondTrap),
+        emit='''
+        // Jump over a 2-byte ud2.
+        sink.put1(0x70 | (fcc2opc(cond.inverse()) as u8));
+        sink.put1(2);
+        // ud2.
+        sink.put1(0x0f);
+        sink.put1(0x0b);
+        ''')
+
+
 # XX /r
 rr = TailRecipe(
         'rr', Binary, size=1, ins=(GPR, GPR), outs=0,