gcc-4_9/gcc/testsuite/gcc.target/mips/branch-helper.h

   1 /* DN(X) generates 2**N copies of asm instruction X.  */
   2 #define D0(X) X
   3 #define D1(X) X "\n\t" X
   4 #define D2(X) D1 (D1 (X))
   5 #define D3(X) D2 (D1 (X))
   6 #define D4(X) D2 (D2 (X))
   7 #define D5(X) D4 (D1 (X))
   8 #define D6(X) D4 (D2 (X))
   9 #define D7(X) D4 (D2 (D1 (X)))
  10 #define D8(X) D4 (D4 (X))
  11 #define D9(X) D8 (D1 (X))
  12 #define D10(X) D8 (D2 (X))
  13 #define D11(X) D8 (D2 (D1 (X)))
  14 #define D12(X) D8 (D4 (X))
  15 #define D13(X) D8 (D4 (D1 (X)))
  16 #define D14(X) D8 (D4 (D2 (X)))
  17
  18 /* Emit something that is 0x1fff8 bytes long, which is the largest
  19    permissible range for non-MIPS16 forward branches.  */
  20 #define OCCUPY_0x1fff8 \
  21   asm (D14 ("nop") "\n\t" \
  22        D13 ("nop") "\n\t" \
  23        D12 ("nop") "\n\t" \
  24        D11 ("nop") "\n\t" \
  25        D10 ("nop") "\n\t" \
  26        D9 ("nop") "\n\t" \
  27        D8 ("nop") "\n\t" \
  28        D7 ("nop") "\n\t" \
  29        D6 ("nop") "\n\t" \
  30        D5 ("nop") "\n\t" \
  31        D4 ("nop") "\n\t" \
  32        D3 ("nop") "\n\t" \
  33        D2 ("nop") "\n\t" \
  34        D1 ("nop"))
  35
  36 /* Likewise emit something that is 0x1fffc bytes long.  */
  37 #define OCCUPY_0x1fffc do { asm ("nop"); OCCUPY_0x1fff8; } while (0)