Hexagon (target/hexagon) Use direct block chaining for direct jump/branch

Direct block chaining is documented here
https://qemu.readthedocs.io/en/latest/devel/tcg.html#direct-block-chaining

Recall that Hexagon allows packets with multiple jumps where only the
first one with a true predicate will actually jump.  We can  use
tcg_gen_goto_tb/tcg_gen_exit_tb when the packet contains a single
PC-relative branch or jump.  If not, we use tcg_gen_lookup_and_goto_ptr.

We add the following to DisasContext in order to delay the branching
until the end of packet commit (in gen_end_tb)
    branch_cond
        The TCGCond condition under which the branch is taken
        When branch_cond == TCG_COND_NEVER, there isn't a single
        direct branch in this packet.
        When branch_cond != TCG_COND_ALWAYS, the value is in
        hex_branch_taken
    branch_dest
        The destination of the branch

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <20221108162906.3166-11-tsimpson@quicinc.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/target/hexagon/translate.h b/target/hexagon/translate.h
index 96509a4da7..aacf0b0921 100644
--- a/target/hexagon/translate.h
+++ b/target/hexagon/translate.h
@@ -57,6 +57,8 @@ typedef struct DisasContext {
     bool qreg_is_predicated[NUM_QREGS];
     int qreg_log_idx;
     bool pre_commit;
+    TCGCond branch_cond;
+    target_ulong branch_dest;
 } DisasContext;
 
 static inline void ctx_log_reg_write(DisasContext *ctx, int rnum)