1 /* 2 * Unconditional branch, 32-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 * Unlike most opcodes, this one is allowed to branch to itself, so 8 * our "backward branch" test must be "<=0" instead of "<0". 9 */ 10 /* goto/32 +AAAAAAAA */ 11 .extern MterpProfileBranch 12 lh rINST, 2(rPC) # rINST <- aaaa (low) 13 lh a1, 4(rPC) # a1 <- AAAA (high) 14 ins rINST, a1, 16, 16 # rINST <- offset (sign-extended AAAAaaaa) 15 #if MTERP_PROFILE_BRANCHES 16 EXPORT_PC 17 move a0, rSELF 18 daddu a1, rFP, OFF_FP_SHADOWFRAME 19 move a2, rINST 20 jal MterpProfileBranch # (self, shadow_frame, offset) 21 bnezc v0, MterpOnStackReplacement # Note: offset must be in rINST 22 #endif 23 dlsa rPC, rINST, rPC, 1 # rPC <- rPC + offset * 2 24 lw ra, THREAD_FLAGS_OFFSET(rSELF) # Preload flags for MterpCheckSuspendAndContinue 25 move a0, rINST # a0 <- offset 26 FETCH_INST # load rINST 27 blez a0, MterpCheckSuspendAndContinue # suspend check if backwards branch 28 GET_INST_OPCODE v0 # extract opcode from rINST 29 GOTO_OPCODE v0 # jump to next instruction 30
