i386.md (HI to SImode promoting splitters): Rewrite.

	* i386.md (HI to SImode promoting splitters): Rewrite.
	(pushsf mem peep2): New.
	(testhi to andhi peep2): Remove.
	* i386.h (x86_promote_QImode): New.
	(TARGET_PROMOTE_QImode): New.
	(PREDICATE_CODES): Add promotable_binary_operator.
	* i386.c (x86_promote_QImode0: New.
	(promotable_binary_operator): New.
	* i386-protos.h (promotable_binary_operator): New.

From-SVN: r30985

gcc/ChangeLog

 Fri Dec 17 01:32:38 MET 1999  Jan Hubicka  <hubicka@freesoft.cz>
 
+	* i386.md (HI to SImode promoting splitters): Rewrite.
+	(pushsf mem peep2): New.
+	(testhi to andhi peep2): Remove.
+	* i386.h (x86_promote_QImode): New.
+	(TARGET_PROMOTE_QImode): New.
+	(PREDICATE_CODES): Add promotable_binary_operator.
+	* i386.c (x86_promote_QImode0: New.
+	(promotable_binary_operator): New.
+	* i386-protos.h (promotable_binary_operator): New.
+
 	* i386.md (test?i_1): Use "nonmemory_operand" predicate, simplify
 	condition.
 	(one_cmpl?i*): Pass "NOT" to unary_operator_ok.

gcc/config/i386/i386-protos.h

@@ -60,6 +60,7 @@ extern int binary_fp_operator PROTO((rtx, enum machine_mode));
 extern int mult_operator PROTO((rtx, enum machine_mode));
 extern int div_operator PROTO((rtx, enum machine_mode));
 extern int arith_or_logical_operator PROTO((rtx, enum machine_mode));
+extern int promotable_binary_operator PROTO((rtx, enum machine_mode));
 extern int memory_displacement_operand PROTO((rtx, enum machine_mode));
 extern int cmpsi_operand PROTO((rtx, enum machine_mode));
 extern int long_memory_operand PROTO((rtx, enum machine_mode));

gcc/config/i386/i386.c

@@ -205,6 +205,7 @@ const int x86_use_cltd = ~(m_PENT | m_K6);
 const int x86_read_modify_write = ~m_PENT;
 const int x86_read_modify = ~(m_PENT | m_PPRO);
 const int x86_split_long_moves = m_PPRO;
+const int x86_promote_QImode = m_K6 | m_PENT | m_386 | m_486;
 
 #define AT_BP(mode) (gen_rtx_MEM ((mode), frame_pointer_rtx))
 
@@ -1177,6 +1178,30 @@ fcmov_comparison_operator (op, mode)
 	  && GET_CODE (op) == unsigned_condition (GET_CODE (op)));
 }
 
+/* Return 1 if OP is a binary operator that can be promoted to wider mode.  */
+
+int
+promotable_binary_operator (op, mode)
+     register rtx op;
+     enum machine_mode mode ATTRIBUTE_UNUSED;
+{
+  switch (GET_CODE (op))
+    {
+    case MULT:
+      /* Modern CPUs have same latency for HImode and SImode multiply,
+         but 386 and 486 do HImode multiply faster.  */
+      return ix86_cpu > PROCESSOR_I486;
+    case PLUS:
+    case AND:
+    case IOR:
+    case XOR:
+    case ASHIFT:
+      return 1;
+    default:
+      return 0;
+    }
+}
+
 /* Nearly general operand, but accept any const_double, since we wish
    to be able to drop them into memory rather than have them get pulled
    into registers.  */

gcc/config/i386/i386.h

@@ -161,6 +161,7 @@ extern const int x86_double_with_add, x86_partial_reg_stall, x86_movx;
 extern const int x86_use_loop, x86_use_fiop, x86_use_mov0;
 extern const int x86_use_cltd, x86_read_modify_write;
 extern const int x86_read_modify, x86_split_long_moves;
+extern const int x86_promote_QImode;
 
 #define TARGET_USE_LEAVE (x86_use_leave & CPUMASK)
 #define TARGET_PUSH_MEMORY (x86_push_memory & CPUMASK)
@@ -182,6 +183,7 @@ extern const int x86_read_modify, x86_split_long_moves;
 #define TARGET_SPLIT_LONG_MOVES (x86_split_long_moves & CPUMASK)
 #define TARGET_READ_MODIFY_WRITE (x86_read_modify_write & CPUMASK)
 #define TARGET_READ_MODIFY (x86_read_modify & CPUMASK)
+#define TARGET_PROMOTE_QImode (x86_promote_QImode & CPUMASK)
 
 #define TARGET_STACK_PROBE (target_flags & MASK_STACK_PROBE)
 
@@ -2437,6 +2439,7 @@ do { long l;						\
 				 UMIN, UMAX, COMPARE, MINUS, DIV, MOD,	\
 				 UDIV, UMOD, ASHIFT, ROTATE, ASHIFTRT,	\
 				 LSHIFTRT, ROTATERT}},			\
+  {"promotable_binary_operator", {PLUS, MULT, AND, IOR, XOR, ASHIFT}},	\
   {"memory_displacement_operand", {MEM}},				\
   {"cmpsi_operand", {CONST_INT, CONST_DOUBLE, CONST, SYMBOL_REF,	\
 		     LABEL_REF, SUBREG, REG, MEM, AND}},		\