msp430.md (ashlhi3): Optimize one bit shifts.

	* config/msp430/msp430.md (ashlhi3): Optimize one bit shifts.
	(ashrhi3): Likewise.
	(lshrhi3): Likewise.

From-SVN: r235410

gcc/ChangeLog

+2016-04-25  DJ Delorie  <dj@redhat.com>
+
+	* config/msp430/msp430.md (ashlhi3): Optimize one bit shifts.
+	(ashrhi3): Likewise.
+	(lshrhi3): Likewise.
+
 2016-04-25  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/70780

gcc/config/msp430/msp430.md

@@ -756,6 +756,9 @@
         && REG_P (operands[1])
         && CONST_INT_P (operands[2]))
       emit_insn (gen_430x_shift_left (operands[0], operands[1], operands[2]));
+    else if (CONST_INT_P (operands[2])
+	     && INTVAL (operands[2]) == 1)
+      emit_insn (gen_slli_1 (operands[0], operands[1]));
     else		 
       msp430_expand_helper (operands, \"__mspabi_slli\", true);
     DONE;
@@ -825,6 +828,9 @@
         && REG_P (operands[1])
         && CONST_INT_P (operands[2]))
       emit_insn (gen_430x_arithmetic_shift_right (operands[0], operands[1], operands[2]));
+    else if (CONST_INT_P (operands[2])
+	     && INTVAL (operands[2]) == 1)
+      emit_insn (gen_srai_1 (operands[0], operands[1]));
     else		 
        msp430_expand_helper (operands, \"__mspabi_srai\", true);
    DONE;
@@ -910,6 +916,9 @@
         && REG_P (operands[1])
         && CONST_INT_P (operands[2]))
       emit_insn (gen_430x_logical_shift_right (operands[0], operands[1], operands[2]));
+    else if (CONST_INT_P (operands[2])
+	     && INTVAL (operands[2]) == 1)
+      emit_insn (gen_srli_1 (operands[0], operands[1]));
     else		 
       msp430_expand_helper (operands, \"__mspabi_srli\", true);
     DONE;