+2012-12-19 Terry Guo <terry.guo@arm.com>
+
+ * config/arm/arm.c (thumb_find_work_register): Check argument
+ register number based on current PCS.
+
2012-12-18 Jakub Jelinek <jakub@redhat.com>
PR target/55562
if (! cfun->machine->uses_anonymous_args
&& crtl->args.size >= 0
&& crtl->args.size <= (LAST_ARG_REGNUM * UNITS_PER_WORD)
- && crtl->args.info.nregs < 4)
+ && (TARGET_AAPCS_BASED
+ ? crtl->args.info.aapcs_ncrn < 4
+ : crtl->args.info.nregs < 4))
return LAST_ARG_REGNUM;
/* Otherwise look for a call-saved register that is going to be pushed. */
--- /dev/null
+/* Wrong method to get number of arg reg will cause argument corruption. */
+/* { dg-do run } */
+/* { dg-require-effective-target arm_eabi } */
+/* { dg-options "-mthumb -O1" } */
+
+extern void abort (void);
+
+int foo (int, int, int, int) __attribute__((noinline));
+
+int
+foo (int a, int b, int c, int d)
+{
+ register int m asm ("r8");
+
+ m = a;
+ m += b;
+ m += c;
+ m += d;
+
+ asm ("" : "=r" (m) : "0" (m));
+
+ return m;
+}
+
+int
+main ()
+{
+ volatile int a = 10;
+ volatile int b = 20;
+ volatile int c = 30;
+ volatile int d = 40;
+ volatile int sum = 0;
+
+ sum = foo (a, b, c, d);
+
+ if (sum != 100)
+ abort ();
+
+ return 0;
+}