Hexagon (target/hexagon) Only use branch_taken when packet has multi cof

When a packet has more than one change-of-flow instruction, only the first
one to branch is considered.  We use the branch_taken variable to keep
track of this.

However, when there is a single cof instruction, we don't need the same
amount of bookkeeping.

We add the pkt_has_multi_cof member to the Packet structure, and pass this
information to the needed functions.

When there is a generated helper function with cof, the generator will
pass this pkt_has_multi_cof as a runtime value.

Acked-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Message-Id: <20221108162906.3166-5-tsimpson@quicinc.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/target/hexagon/gen_tcg_funcs.py b/target/hexagon/gen_tcg_funcs.py
index ca5fde9..bd199dc 100755
--- a/target/hexagon/gen_tcg_funcs.py
+++ b/target/hexagon/gen_tcg_funcs.py
@@ -622,6 +622,9 @@ def gen_tcg_func(f, tag, regs, imms):
         ## Generate the call to the helper
         for immlett,bits,immshift in imms:
             gen_helper_decl_imm(f,immlett)
+        if hex_common.need_pkt_has_multi_cof(tag):
+            f.write("    TCGv pkt_has_multi_cof = ")
+            f.write("tcg_constant_tl(ctx->pkt->pkt_has_multi_cof);\n")
         if hex_common.need_part1(tag):
             f.write("    TCGv part1 = tcg_constant_tl(insn->part1);\n")
         if hex_common.need_slot(tag):
@@ -654,6 +657,8 @@ def gen_tcg_func(f, tag, regs, imms):
         for immlett,bits,immshift in imms:
             gen_helper_call_imm(f,immlett)
 
+        if hex_common.need_pkt_has_multi_cof(tag):
+            f.write(", pkt_has_multi_cof")
         if hex_common.need_slot(tag): f.write(", slot")
         if hex_common.need_part1(tag): f.write(", part1" )
         f.write(");\n")