MSP430: Tweaks to generation of 430X instructions

gcc/ChangeLog:

2019-10-24  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	* config/msp430/constraints.md: Allow post_inc for "Ya" constraint.
	* config/msp430/msp430.md (430x_shift_left): Use RLAM when the constant
	shift amount is between 1 and 4.
	(430x_arithmetic_shift_right): Use RRAM when the constant shift amount
	is between 1 and 4.

gcc/testsuite/ChangeLog:

2019-10-24  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

	* gcc.target/msp430/emulate-slli.c: Skip for -mcpu=msp430.
	Add shift by a constant 5 bits.
	Update scan-assembler directives.
	* gcc.target/msp430/emulate-srai.c: Likewise.
	* gcc.target/msp430/emulate-srli.c: Skip for -mcpu=msp430.

From-SVN: r277394

gcc/ChangeLog

+2019-10-24  Jozef Lawrynowicz  <jozef.l@mittosystems.com>
+
+	* config/msp430/constraints.md: Allow post_inc for "Ya" constraint.
+	* config/msp430/msp430.md (430x_shift_left): Use RLAM when the constant
+	shift amount is between 1 and 4.
+	(430x_arithmetic_shift_right): Use RRAM when the constant shift amount
+	is between 1 and 4.
+
 2019-10-24  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/92205

gcc/config/msp430/constraints.md

@@ -82,6 +82,7 @@
 		  (match_test ("CONST_INT_P (XEXP (XEXP (op, 0), 1))"))
 		  (match_test ("IN_RANGE (INTVAL (XEXP (XEXP (op, 0), 1)), HOST_WIDE_INT_M1U << 15, (1 << 15)-1)"))))
 	(match_code "reg" "0")
+	(match_code "post_inc" "0")
 	)))
 
 (define_constraint "Yc"

gcc/config/msp430/msp430.md

@@ -875,8 +875,10 @@
 		   (match_operand    2 "immediate_operand" "n")))]
   "msp430x"
   "*
-  if (INTVAL (operands[2]) > 0 && INTVAL (operands[2]) < 16)
-    return \"rpt\t%2 { rlax.w\t%0\";
+  if (INTVAL (operands[2]) > 0 && INTVAL (operands[2]) < 5)
+    return \"RLAM.W\t%2, %0\";
+  else if (INTVAL (operands[2]) >= 5 && INTVAL (operands[2]) < 16)
+    return \"RPT\t%2 { RLAX.W\t%0\";
   return \"# nop left shift\";
   "
 )
@@ -960,8 +962,10 @@
 		     (match_operand    2 "immediate_operand" "n")))]
   "msp430x"
   "*
-  if (INTVAL (operands[2]) > 0 && INTVAL (operands[2]) < 16)
-    return \"rpt\t%2 { rrax.w\t%0\";
+  if (INTVAL (operands[2]) > 0 && INTVAL (operands[2]) < 5)
+    return \"RRAM.W\t%2, %0\";
+  else if (INTVAL (operands[2]) >= 5 && INTVAL (operands[2]) < 16)
+    return \"RPT\t%2 { RRAX.W\t%0\";
   return \"# nop arith right shift\";
   "
 )

gcc/testsuite/ChangeLog

+2019-10-24  Jozef Lawrynowicz  <jozef.l@mittosystems.com>
+
+	* gcc.target/msp430/emulate-slli.c: Skip for -mcpu=msp430.
+	Add shift by a constant 5 bits.
+	Update scan-assembler directives.
+	* gcc.target/msp430/emulate-srai.c: Likewise.
+	* gcc.target/msp430/emulate-srli.c: Skip for -mcpu=msp430.
+
 2019-10-24  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/92205

gcc/testsuite/gcc.target/msp430/emulate-slli.c

 /* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-mcpu=msp430" } { "" } } */
 /* { dg-options "-Os" } */
 /* { dg-final { scan-assembler-not "mspabi_slli" } } */
-/* { dg-final { scan-assembler "rlax" } } */
+/* { dg-final { scan-assembler "RLAM.W\t#4" } } */
+/* { dg-final { scan-assembler "RPT\t#5 \{ RLAX.W" } } */
 
 /* Ensure that HImode shifts with source operand in memory are emulated with a
    rotate instructions.  */
 
 int a;
+int b;
 
 void
 foo (void)
 {
   a = a << 4;
+  b = b << 5;
 }

gcc/testsuite/gcc.target/msp430/emulate-srai.c

 /* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-mcpu=msp430" } { "" } } */
 /* { dg-options "-Os" } */
 /* { dg-final { scan-assembler-not "mspabi_srai" } } */
-/* { dg-final { scan-assembler "rrax" } } */
+/* { dg-final { scan-assembler "RRAM.W\t#4" } } */
+/* { dg-final { scan-assembler "RPT\t#5 \{ RRAX.W" } } */
 
 /* Ensure that HImode shifts with source operand in memory are emulated with a
    rotate instructions.  */
 
 int a;
+int b;
 
 void
 foo (void)
 {
   a = a >> 4;
+  b = b >> 5;
 }

gcc/testsuite/gcc.target/msp430/emulate-srli.c

 /* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-mcpu=msp430" } { "" } } */
 /* { dg-options "-Os" } */
 /* { dg-final { scan-assembler-not "mspabi_srli" } } */
 /* { dg-final { scan-assembler "rrum" } } */