Fix generated code for ISA predicates on encoding recipes.

The generated code had syntax errors and inverted logic.

Add an SSE 4.1 requirement to the floating point rounding instructions.

lib/cretonne/meta/gen_encoding.py

@@ -169,15 +169,19 @@ def emit_recipe_predicates(isa, fmt):
         # Generate the predicate function.
         with fmt.indented(
                 'fn {}({}: ::settings::PredicateView, '
-                'inst: &ir::InstructionData) -> bool {{'
+                '{}: &ir::InstructionData) -> bool {{'
                 .format(
                     name,
-                    'isap' if isap else '_'), '}'):
+                    'isap' if isap else '_',
+                    'inst' if instp else '_'), '}'):
             if isap:
                 n = isa.settings.predicate_number[isap]
-                with fmt.indented('if isap.test({})'.format(n), '}'):
+                with fmt.indented('if !isap.test({}) {{'.format(n), '}'):
                     fmt.line('return false;')
-            emit_instp(instp, fmt)
+            if instp:
+                emit_instp(instp, fmt)
+            else:
+                fmt.line('true')
 
     # Generate the static table.
     with fmt.indented(

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

@@ -13,6 +13,7 @@ from base.formats import Ternary, FuncAddr, UnaryGlobalVar
 from base.formats import RegMove, RegSpill, RegFill, CopySpecial
 from .registers import GPR, ABCD, FPR, GPR8, FPR8, FLAG, StackGPR32, StackFPR32
 from .defs import supported_floatccs
+from .settings import use_sse41
 
 try:
     from typing import Tuple, Dict, Sequence, Any  # noqa
@@ -372,6 +373,7 @@ rfurm = TailRecipe(
 # XX /r, RMI form for one of the roundXX SSE 4.1 instructions.
 furmi_rnd = TailRecipe(
         'furmi_rnd', Unary, size=2, ins=FPR, outs=FPR,
+        isap=use_sse41,
         emit='''
         PUT_OP(bits, rex2(in_reg0, out_reg0), sink);
         modrm_rr(in_reg0, out_reg0, sink);