1%default { "func":"MterpDoPackedSwitch" }
2    /*
3     * Handle a packed-switch or sparse-switch instruction.  In both cases
4     * we decode it and hand it off to a helper function.
5     *
6     * We don't really expect backward branches in a switch statement, but
7     * they're perfectly legal, so we check for them here.
8     *
9     * for: packed-switch, sparse-switch
10     */
11    /* op vAA, +BBBBBBBB */
12    .extern $func
13    .extern MterpProfileBranch
14    lh      a0, 2(rPC)                  # a0 <- bbbb (lo)
15    lh      a1, 4(rPC)                  # a1 <- BBBB (hi)
16    srl     a3, rINST, 8                # a3 <- AA
17    ins     a0, a1, 16, 16              # a0 <- BBBBbbbb
18    GET_VREG a1, a3                     # a1 <- vAA
19    dlsa    a0, a0, rPC, 1              # a0 <- PC + BBBBbbbb*2
20    jal     $func                       # v0 <- code-unit branch offset
21    move    rINST, v0
22#if MTERP_PROFILE_BRANCHES
23    EXPORT_PC
24    move    a0, rSELF
25    daddu   a1, rFP, OFF_FP_SHADOWFRAME
26    move    a2, rINST
27    jal     MterpProfileBranch          # (self, shadow_frame, offset)
28    bnezc   v0, MterpOnStackReplacement # Note: offset must be in rINST
29#endif
30    dlsa    rPC, rINST, rPC, 1          # rPC <- rPC + offset * 2
31    lw      ra, THREAD_FLAGS_OFFSET(rSELF)  # Preload flags for MterpCheckSuspendAndContinue
32    move    a0, rINST                   # a0 <- offset
33    FETCH_INST                          # load rINST
34    blez    a0, MterpCheckSuspendAndContinue  # suspend check if backwards branch
35    GET_INST_OPCODE v0                  # extract opcode from rINST
36    GOTO_OPCODE v0                      # jump to next instruction
37