GDB 7.6.50

gdb/testsuite/gdb.arch/mips-octeon-bbit.c

+typedef unsigned long long uint64_t;
+void abort (void);
+
+#define BASE 0x1234567812345678ull
+
+#define DEF_BBIT_TAKEN(BRANCH_IF, BIT)                                  \
+  int bbit_is_taken_##BRANCH_IF##_##BIT (volatile uint64_t *p)          \
+  {                                                                     \
+    int ret;                                                            \
+    asm (".set push                             \n\t"                   \
+         ".set noreorder                        \n\t"                   \
+         "bbit" #BRANCH_IF " %1, " #BIT ", 1f   \n\t"                   \
+         "nop                                   \n\t"                   \
+         "li %0, 0                              \n\t"                   \
+         "b 2f                                  \n\t"                   \
+         "nop                                   \n\t"                   \
+         "1:                                    \n\t"                   \
+         "li %0, 1                              \n\t"                   \
+         "2:                                    \n\t"                   \
+         ".set pop"                                                     \
+         : "=r"(ret) : "r"(*p));                                        \
+    return ret;                                                         \
+  }                                                                     \
+  volatile uint64_t taken_##BRANCH_IF##_##BIT =                         \
+    BASE & (~(1ull << BIT)) | ((uint64_t) BRANCH_IF << BIT);            \
+  volatile uint64_t not_taken_##BRANCH_IF##_##BIT =                     \
+    BASE & (~(1ull << BIT)) | (((uint64_t) !BRANCH_IF) << BIT);  
+
+DEF_BBIT_TAKEN (0, 10);
+DEF_BBIT_TAKEN (0, 36);
+DEF_BBIT_TAKEN (1, 20);
+DEF_BBIT_TAKEN (1, 49);
+
+#define EXPECT(X) if (!(X)) abort ();
+
+main ()
+{
+  EXPECT (bbit_is_taken_0_10 (&taken_0_10));
+  EXPECT (!bbit_is_taken_0_10 (&not_taken_0_10));
+
+  EXPECT (bbit_is_taken_0_36 (&taken_0_36));
+  EXPECT (!bbit_is_taken_0_36 (&not_taken_0_36));
+
+  EXPECT (bbit_is_taken_1_20 (&taken_1_20));
+  EXPECT (!bbit_is_taken_1_20 (&not_taken_1_20));
+
+  EXPECT (bbit_is_taken_1_49 (&taken_1_49));
+  EXPECT (!bbit_is_taken_1_49 (&not_taken_1_49));
+}