[PATCH, GCC/ARM] Fix MVE scalar shift tests

*** gcc/ChangeLog ***

2020-02-21  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>

	* config/arm/arm.md: Prevent scalar shifts from being
	used when big endian is enabled.

*** gcc/testsuite/ChangeLog ***

2020-02-21  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>

	* gcc.target/arm/armv8_1m-shift-imm-1.c: Add MVE target checks.
	* gcc.target/arm/armv8_1m-shift-reg-1.c: Likewise.
	* lib/target-supports.exp
	(check_effective_target_arm_v8_1m_mve_ok_nocache): New.
	(check_effective_target_arm_v8_1m_mve_ok): New.
	(add_options_for_v8_1m_mve): New.

gcc/ChangeLog

+2020-02-21  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
+
+	* config/arm/arm.md: Prevent scalar shifts from being used when big
+	endian is enabled.
+
 2020-02-21  Jan Hubicka  <hubicka@ucw.cz>
 	    Richard Biener  <rguenther@suse.de>
 

gcc/config/arm/arm.md

@@ -4399,7 +4399,7 @@
                    (match_operand:SI 2 "reg_or_int_operand")))]
   "TARGET_32BIT"
   "
-  if (TARGET_HAVE_MVE)
+  if (TARGET_HAVE_MVE && !BYTES_BIG_ENDIAN)
     {
       if (!reg_or_int_operand (operands[2], SImode))
         operands[2] = force_reg (SImode, operands[2]);
@@ -4443,7 +4443,7 @@
   "TARGET_32BIT"
   "
   /* Armv8.1-M Mainline double shifts are not expanded.  */
-  if (TARGET_HAVE_MVE
+  if (TARGET_HAVE_MVE && !BYTES_BIG_ENDIAN
       && arm_reg_or_long_shift_imm (operands[2], GET_MODE (operands[2])))
     {
       if (!reg_overlap_mentioned_p(operands[0], operands[1]))
@@ -4478,7 +4478,7 @@
   "TARGET_32BIT"
   "
   /* Armv8.1-M Mainline double shifts are not expanded.  */
-  if (TARGET_HAVE_MVE
+  if (TARGET_HAVE_MVE && !BYTES_BIG_ENDIAN
     && long_shift_imm (operands[2], GET_MODE (operands[2])))
     {
       if (!reg_overlap_mentioned_p(operands[0], operands[1]))

gcc/testsuite/ChangeLog

+2020-02-21  Mihail-Calin Ionescu  <mihail.ionescu@arm.com>
+
+	* gcc.target/arm/armv8_1m-shift-imm-1.c: Add MVE target checks.
+	* gcc.target/arm/armv8_1m-shift-reg-1.c: Likewise.
+	* lib/target-supports.exp
+	(check_effective_target_arm_v8_1m_mve_ok_nocache): New.
+	(check_effective_target_arm_v8_1m_mve_ok): New.
+	(add_options_for_v8_1m_mve): New.
+
 2020-02-21  Uroš Bizjak  <ubizjak@gmail.com>
 
 	* gcc.dg/vect/vect-epilogues.c (scan-tree-dump): Require

gcc/testsuite/gcc.target/arm/armv8_1m-shift-imm-1.c

 /* { dg-do compile } */
-/* { dg-options "-O2 -march=armv8.1-m.main+mve -mfloat-abi=softfp" } */
+/* { dg-options "-O2 -mfloat-abi=softfp -mlittle-endian" } */
+/* { dg-require-effective-target arm_v8_1m_mve_ok } */
+/* { dg-add-options arm_v8_1m_mve } */
 
 long long longval1;
 long long unsigned longval2;

gcc/testsuite/gcc.target/arm/armv8_1m-shift-reg-1.c

 /* { dg-do compile } */
-/* { dg-options "-O2 -march=armv8.1-m.main+mve -mfloat-abi=softfp" } */
+/* { dg-options "-O2 -mfloat-abi=softfp -mlittle-endian" } */
+/* { dg-require-effective-target arm_v8_1m_mve_ok } */
+/* { dg-add-options arm_v8_1m_mve } */
 
 long long longval2;
 int intval2;

gcc/testsuite/lib/target-supports.exp

@@ -4828,6 +4828,48 @@ proc check_effective_target_arm_v8_2a_dotprod_neon_ok_nocache { } {
     return 0;
 }
 
+# Return 1 if the target supports ARMv8.1-M MVE
+# instructions, 0 otherwise.  The test is valid for ARM.
+# Record the command line options needed.
+
+proc check_effective_target_arm_v8_1m_mve_ok_nocache { } {
+    global et_arm_v8_1m_mve_flags
+    set et_arm_v8_1m_mve_flags ""
+
+    if { ![istarget arm*-*-*] } {
+        return 0;
+    }
+
+    # Iterate through sets of options to find the compiler flags that
+    # need to be added to the -march option.
+    foreach flags {"" "-mfloat-abi=softfp -mfpu=auto" "-mfloat-abi=hard -mfpu=auto"} {
+        if { [check_no_compiler_messages_nocache \
+                  arm_v8_1m_mve_ok object {
+            #if !defined (__ARM_FEATURE_MVE)
+            #error "__ARM_FEATURE_MVE not defined"
+            #endif
+        } "$flags -mthumb"] } {
+            set et_arm_v8_1m_mve_flags "$flags -mthumb"
+            return 1
+        }
+    }
+
+    return 0;
+}
+
+proc check_effective_target_arm_v8_1m_mve_ok { } {
+    return [check_cached_effective_target arm_v8_1m_mve_ok \
+                check_effective_target_arm_v8_1m_mve_ok_nocache]
+}
+
+proc add_options_for_arm_v8_1m_mve { flags } {
+    if { ! [check_effective_target_arm_v8_1m_mve_ok] } {
+        return "$flags"
+    }
+    global et_arm_v8_1m_mve_flags
+    return "$flags $et_arm_v8_1m_mve_flags"
+}
+
 proc check_effective_target_arm_v8_2a_dotprod_neon_ok { } {
     return [check_cached_effective_target arm_v8_2a_dotprod_neon_ok \
                 check_effective_target_arm_v8_2a_dotprod_neon_ok_nocache]