ARM: fix -masm-syntax-unified (PR88648)

This allows to use unified asm syntax when compiling for the
ARM instruction. This matches documentation and seems what the
initial patch was intended doing when the flag got added.

2019-01-10  Stefan Agner  <stefan@agner.ch>

	PR target/88648
	* config/arm/arm.c (arm_option_override_internal): Force
	opts->x_inline_asm_unified to true only if TARGET_THUMB2_P.

	* gcc.target/arm/pr88648-asm-syntax-unified.c: Add test to
	check if -masm-syntax-unified gets applied properly.

From-SVN: r267804

gcc/ChangeLog

+2019-01-10  Stefan Agner  <stefan@agner.ch>
+
+	PR target/88648
+	* config/arm/arm.c (arm_option_override_internal): Force
+	opts->x_inline_asm_unified to true only if TARGET_THUMB2_P.
+
 2019-01-10  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/88568

gcc/config/arm/arm.c

@@ -3101,7 +3101,8 @@ arm_option_override_internal (struct gcc_options *opts,
 
   /* Thumb2 inline assembly code should always use unified syntax.
      This will apply to ARM and Thumb1 eventually.  */
-  opts->x_inline_asm_unified = TARGET_THUMB2_P (opts->x_target_flags);
+  if (TARGET_THUMB2_P (opts->x_target_flags))
+    opts->x_inline_asm_unified = true;
 
 #ifdef SUBTARGET_OVERRIDE_INTERNAL_OPTIONS
   SUBTARGET_OVERRIDE_INTERNAL_OPTIONS;

gcc/testsuite/ChangeLog

+2019-01-10  Stefan Agner  <stefan@agner.ch>
+
+	PR target/88648
+	* gcc.target/arm/pr88648-asm-syntax-unified.c: Add test to
+	check if -masm-syntax-unified gets applied properly.
+
 2019-01-10  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/88568

gcc/testsuite/gcc.target/arm/pr88648-asm-syntax-unified.c

+/* Test for unified syntax assembly generation.  */
+/* { dg-do compile } */
+/* { dg-require-effective-target arm_arch_v7a_ok } */
+/* { dg-add-options arm_arch_v7a } */
+/* { dg-options "-marm -march=armv7-a -masm-syntax-unified" } */
+
+void test ()
+{
+  asm("nop");
+}
+
+/* { dg-final { scan-assembler-times {\.syntax\sunified} 3 } } */
+/* { dg-final { scan-assembler-not {\.syntax\sdivided} } } */
+