target: [PR102941] Fix inline-asm flags with non-REG_P output

So the problem here is that arm_md_asm_adjust would
just create a set directly to the output memory which is wrong.
It needs to output to a temp register first and then do a
move.

OK? Bootstrapped and tested on aarch64-linux-gnu with no regressions.
I have no way to test on arm even though this touches common code.

	PR target/102941

gcc/ChangeLog:

	* config/arm/aarch-common.c (arm_md_asm_adjust):
	Use a temp if !REG_P.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/asm-flag-7.c: New test.
	* gcc.target/arm/asm-flag-7.c: New test.

gcc/config/arm/aarch-common.c

@@ -641,7 +641,7 @@ arm_md_asm_adjust (vec<rtx> &outputs, vec<rtx> & /*inputs*/,
       rtx x = gen_rtx_REG (mode, CC_REGNUM);
       x = gen_rtx_fmt_ee (code, word_mode, x, const0_rtx);
 
-      if (dest_mode == word_mode)
+      if (dest_mode == word_mode && REG_P (dest))
 	emit_insn (gen_rtx_SET (dest, x));
       else
 	{

gcc/testsuite/gcc.target/aarch64/asm-flag-7.c

@@ -0,0 +1,22 @@
+/* Test that "=@cc*" works with MEM_P RTX  */
+/* PR target/102941 */
+/* { dg-do compile } */
+/* { dg-options "-O" } */
+
+#ifndef __GCC_ASM_FLAG_OUTPUTS__
+#error "missing preprocessor define"
+#endif
+int test_cmpu_x;
+
+void f(long *);
+long
+test_cmpu_y() {
+  long le;
+  f(&le);
+  __asm__("cmp %"
+          "[x], %"
+          "[y]"
+          : "=@ccls"(le)
+          : [x] ""(test_cmpu_x), [y] ""(test_cmpu_y));
+    return le;
+}

gcc/testsuite/gcc.target/arm/asm-flag-7.c

@@ -0,0 +1,23 @@
+/* Test that "=@cc*" works with MEM_P RTX  */
+/* PR target/102941 */
+/* { dg-do compile } */
+/* { dg-options "-O" } */
+/* { dg-skip-if "" { arm_thumb1 } } */
+
+#ifndef __GCC_ASM_FLAG_OUTPUTS__
+#error "missing preprocessor define"
+#endif
+int test_cmpu_x;
+
+void f(long *);
+long
+test_cmpu_y() {
+  long le;
+  f(&le);
+  __asm__("cmp %"
+          "[x], %"
+          "[y]"
+          : "=@ccls"(le)
+          : [x] ""(test_cmpu_x), [y] ""(test_cmpu_y));
+    return le;
+}