1 /* 2 * Unconditional branch, 8-bit offset. 3 * 4 * The branch distance is a signed code-unit offset, which we need to 5 * double to get a byte offset. 6 */ 7 /* goto +AA */ 8 #if MTERP_PROFILE_BRANCHES 9 sll a0, rINST, 16 # a0 <- AAxx0000 10 sra rINST, a0, 24 # rINST <- ssssssAA (sign-extended) 11 EXPORT_PC() 12 move a0, rSELF 13 addu a1, rFP, OFF_FP_SHADOWFRAME 14 move a2, rINST 15 JAL(MterpProfileBranch) # (self, shadow_frame, offset) 16 bnez v0, MterpOnStackReplacement # Note: offset must be in rINST 17 addu a2, rINST, rINST # a2 <- byte offset 18 FETCH_ADVANCE_INST_RB(a2) # update rPC, load rINST 19 /* If backwards branch refresh rIBASE */ 20 bgez a2, 1f 21 lw ra, THREAD_FLAGS_OFFSET(rSELF) 22 b MterpCheckSuspendAndContinue 23 1: 24 GET_INST_OPCODE(t0) # extract opcode from rINST 25 GOTO_OPCODE(t0) # jump to next instruction 26 #else 27 sll a0, rINST, 16 # a0 <- AAxx0000 28 sra rINST, a0, 24 # rINST <- ssssssAA (sign-extended) 29 addu a2, rINST, rINST # a2 <- byte offset 30 FETCH_ADVANCE_INST_RB(a2) # update rPC, load rINST 31 /* If backwards branch refresh rIBASE */ 32 bgez a1, 1f 33 lw ra, THREAD_FLAGS_OFFSET(rSELF) 34 b MterpCheckSuspendAndContinue 35 1: 36 GET_INST_OPCODE(t0) # extract opcode from rINST 37 GOTO_OPCODE(t0) # jump to next instruction 38 #endif 39
