Subversion Repositories openrisc_2011-10-31

.EXTERN MY_LABEL2;

.section .text;

//

//2 Program Flow Control

//

//JUMP ( Preg ) ; /* indirect to an absolute (not PC-relative)address (a) */

//Preg: P5-0, SP, FP

JUMP (P0);

JUMP (P1);

JUMP (P2);

JUMP (P3);

JUMP (P4);

JUMP (P5);

JUMP (SP);

JUMP (FP);

//JUMP ( PC + Preg ) ; /* PC-relative, indexed (a) */

JUMP (PC+P0);

JUMP (PC+P1);

JUMP (PC+P2);

JUMP (PC+P3);

JUMP (PC+P4);

JUMP (PC+P5);

JUMP (PC+SP);

JUMP (PC+FP);

//JUMP pcrelm2 ; /* PC-relative, immediate (a) or (b) */

JUMP 0X0;

JUMP 1234;

JUMP -1234;

JUMP 2;

JUMP -2;

MY_LABEL1:

//JUMP.S pcrel13m2 ; /* PC-relative, immediate, short (a) */

JUMP.S 0X0;

JUMP.S 1234;

JUMP.S -1234;

JUMP.S 2;

JUMP.S -2;

//JUMP.L pcrel25m2 ; /* PC-relative, immediate, long (b) */

JUMP.L 0XFF800000;

JUMP.L 0X007FFFFE;

JUMP.L 0X0;

JUMP.L 1234;

JUMP.L -1234;

JUMP.L 2;

JUMP.L -2;

//JUMP user_label ; /* user-defined absolute address label, */

JUMP MY_LABEL1;

JUMP MY_LABEL2;

JUMP MY_LABEL1-2;

JUMP MY_LABEL2-2;

//IF CC JUMP pcrel11m2 ; /* branch if CC=1, branch predicted as not taken (a) */

IF CC JUMP 0xFFFFFE08;

IF CC JUMP 0x0B4;

IF CC JUMP 0;

//IF CC JUMP pcrel11m2 (bp) ; /* branch if CC=1, branch predicted as taken (a) */

IF CC JUMP 0xFFFFFE08(bp);

IF CC JUMP 0x0B4(bp);

//IF !CC JUMP pcrel11m2 ; /* branch if CC=0, branch predicted as not taken (a) */

IF !CC JUMP 0xFFFFFF22;

IF !CC JUMP 0X120;

//IF !CC JUMP pcrel11m2 (bp) ; /* branch if CC=0, branch predicted as taken (a) */

IF !CC JUMP 0xFFFFFF22(bp);

IF !CC JUMP 0X120(bp);

//IF CC JUMP user_label ; /* user-defined absolute address label, resolved by the assembler/linker to the appropriate PC-relative instruction (a) */

IF CC JUMP MY_LABEL1;

IF CC JUMP MY_LABEL2;

//IF CC JUMP user_label (bp) ; /* user-defined absolute address label, resolved by the assembler/linker to the appropriate PC-relative instruction (a) */

IF CC JUMP MY_LABEL1(bp);

IF CC JUMP MY_LABEL2(bp);

//IF !CC JUMP user_label ; /* user-defined absolute address label, resolved by the assembler/linker to the appropriate PC-relative instruction (a) */

IF !CC JUMP MY_LABEL1;

IF !CC JUMP MY_LABEL2;

//IF !CC JUMP user_label (bp) ; /* user-defined absolute address label, resolved by the assembler/linker to the appropriate PC-relative instruction (a) */

IF !CC JUMP MY_LABEL1(bp);

IF !CC JUMP MY_LABEL2(bp);

//CALL ( Preg ) ; /* indirect to an absolute (not PC-relative) address (a) */

CALL(P0);

CALL(P1);

CALL(P2);

CALL(P3);

CALL(P4);

CALL(P5);

//CALL ( PC + Preg ) ; /* PC-relative, indexed (a) */

CALL(PC+P0);

CALL(PC+P1);

CALL(PC+P2);

CALL(PC+P3);

CALL(PC+P4);

CALL(PC+P5);

//CALL pcrel25m2 ; /* PC-relative, immediate (b) */

CALL 0x123456 ;

CALL -1234;

//CALL user_label ; /* user-defined absolute address label,resolved by the assembler/linker to the appropriate PC-relative instruction (a) or (b) */

CALL MY_LABEL1;

CALL MY_LABEL2;

RTS ; // Return from Subroutine (a)

RTI ; // Return from Interrupt (a)

RTX ; // Return from Exception (a)

RTN ; // Return from NMI (a)

RTE ; // Return from Emulation (a)

lsetup ( 4, 4 ) lc0 ;

lsetup ( beg_poll_bit, end_poll_bit ) lc0 ;

NOP;NOP;

beg_poll_bit: R0=1(Z);

end_poll_bit: R1=2(Z);

lsetup ( 4, 6 ) lc1 ;

lsetup ( FIR_filter, bottom_of_FIR_filter ) lc1 ;

NOP;

FIR_filter: R0=1(Z);

bottom_of_FIR_filter: R1=2(Z);

lsetup ( 4, 8 ) lc0 = p1 ;

lsetup ( 4, 8 ) lc0 = p1>>1 ;

loop DoItSome LC0 ; /* define loop DoItSome with Loop Counter 0 */

loop_begin DoItSome ; /* place before the first instruction in the loop */

R0=1;

R1=2;

loop_end DoItSome ; /* place after the last instruction in the loop */

loop DoItSomeMore LC1 ; /* define loop MyLoop with Loop Counter 1*/