VAX: Fix predicates and constraints for bit-field comparison insns

It makes no sense for insn operand predicates, as long as they accept a
register operand, to be more restrictive than the set of the associated
constraints, because expand will choose the insn based on the relevant
operand being a pseudo register then and reload keep it happily as a
memory reference if a constraint permits it.  So the restriction posed
by such a predicate will be happily ignored, and moreover if a splitter
is added, such as required for MODE_CC support, the new instructions
will reject the original operands supplied, causing an ICE.  An actual
example will be given with a subsequent change.

Therefore, similarly to EXTV/EXTZV/INSV insns, remove inconsistencies
with predicates and constraints of bit-field comparison insns, observing
that a bit-field located in memory is byte-addressed by the respective
machine instructions and therefore SImode may only be used with a
register or an offsettable memory operand (i.e. not an indexed,
pre-decremented, or post-incremented one).

Also give the insns names, for easier reference here and elsewhere.

	gcc/
	* config/vax/vax.md (*cmpv_2): Name insn.
	(*cmpv, *cmpzv, *cmpzv_2): Likewise.  Fix location predicate and
	constraint.

diff --git a/gcc/config/vax/vax.md b/gcc/config/vax/vax.md
index d8774cd..34fdf67 100644 (file)
--- a/gcc/config/vax/vax.md
+++ b/gcc/config/vax/vax.md
@@ -853,20 +853,20 @@
 \f
 ;; Register and non-offsettable-memory SImode cases of bit-field insns.
 
-(define_insn ""
+(define_insn "*cmpv"
   [(set (cc0)
        (compare
-        (sign_extract:SI (match_operand:SI 0 "register_operand" "r")
+        (sign_extract:SI (match_operand:SI 0 "nonimmediate_operand" "ro")
                          (match_operand:QI 1 "general_operand" "g")
                          (match_operand:SI 2 "general_operand" "nrmT"))
         (match_operand:SI 3 "general_operand" "nrmT")))]
   ""
   "cmpv %2,%1,%0,%3")
 
-(define_insn ""
+(define_insn "*cmpzv"
   [(set (cc0)
        (compare
-        (zero_extract:SI (match_operand:SI 0 "register_operand" "r")
+        (zero_extract:SI (match_operand:SI 0 "nonimmediate_operand" "ro")
                          (match_operand:QI 1 "general_operand" "g")
                          (match_operand:SI 2 "general_operand" "nrmT"))
         (match_operand:SI 3 "general_operand" "nrmT")))]
@@ -921,7 +921,7 @@
 ;; nonimmediate_operand is used to make sure that mode-ambiguous cases
 ;; don't match these (and therefore match the cases above instead).
 
-(define_insn ""
+(define_insn "*cmpv_2"
   [(set (cc0)
        (compare
         (sign_extract:SI (match_operand:QI 0 "memory_operand" "m")
@@ -931,10 +931,10 @@
   ""
   "cmpv %2,%1,%0,%3")
 
-(define_insn ""
+(define_insn "*cmpzv_2"
   [(set (cc0)
        (compare
-        (zero_extract:SI (match_operand:QI 0 "nonimmediate_operand" "rm")
+        (zero_extract:SI (match_operand:QI 0 "memory_operand" "m")
                          (match_operand:QI 1 "general_operand" "g")
                          (match_operand:SI 2 "general_operand" "nrmT"))
         (match_operand:SI 3 "general_operand" "nrmT")))]