i386.md: Create new [right,left] rotate and right shift patterns to optimize shift by 1...

	* i386.md: Create new [right,left] rotate and right shift
	patterns to optimize shift by 1 bit for certain ia32 processors.
	Update patterns which perform left shifts to optimize shift by
	1 bit for certain ia32 processors.
	* i386.c (const_int_1_operand): New predicate.
	* i386.h (PREDICATE_CODES): Handle const_int_1_operand.
	* i386-protos.h (const_int_1_operand): Prototype.

From-SVN: r34569

gcc/ChangeLog

+Thu Jun 15 18:56:12 2000  Jeffrey A Law  (law@cygnus.com)
+
+	* i386.md: Create new [right,left] rotate and right shift
+	patterns to optimize shift by 1 bit for certain ia32 processors.
+	Update patterns which perform left shifts to optimize shift by
+	1 bit for certain ia32 processors.
+	* i386.c (const_int_1_operand): New predicate.
+	* i386.h (PREDICATE_CODES): Handle const_int_1_operand.
+	* i386-protos.h (const_int_1_operand): Prototype.
+
 Wed Jun 14 23:46:26 2000  J"orn Rennecke <amylaar@cygnus.co.uk>
 
 	* mips.c (machine_dependent_reorg): Fix braces for nested if.

gcc/config/i386/i386-protos.h

@@ -41,6 +41,7 @@ extern int ix86_aligned_p PARAMS ((rtx));
 extern int standard_80387_constant_p PARAMS ((rtx));
 extern int symbolic_reference_mentioned_p PARAMS ((rtx));
 
+extern int const_int_1_operand PARAMS ((rtx, enum machine_mode));
 extern int symbolic_operand PARAMS ((rtx, enum machine_mode));
 extern int pic_symbolic_operand PARAMS ((rtx, enum machine_mode));
 extern int call_insn_operand PARAMS ((rtx, enum machine_mode));

gcc/config/i386/i386.c

@@ -981,6 +981,17 @@ function_arg (cum, mode, type, named)
   return ret;
 }
 
+
+/* Return nonzero if OP is (const_int 1), else return zero.  */
+
+int
+const_int_1_operand (op, mode)
+     rtx op;
+     enum machine_mode mode ATTRIBUTE_UNUSED;
+{
+  return (GET_CODE (op) == CONST_INT && INTVAL (op) == 1);
+}
+
 /* Returns 1 if OP is either a symbol reference or a sum of a symbol
    reference and a constant.  */
 

gcc/config/i386/i386.h

@@ -2496,6 +2496,7 @@ do { long l;						\
 /* Define the codes that are matched by predicates in i386.c.  */
 
 #define PREDICATE_CODES							\
+  {"const_int_1_operand", {CONST_INT}},					\
   {"symbolic_operand", {SYMBOL_REF, LABEL_REF, CONST}},			\
   {"aligned_operand", {CONST_INT, CONST_DOUBLE, CONST, SYMBOL_REF,	\
 		       LABEL_REF, SUBREG, REG, MEM}},			\