| Message ID | 20240226201722.391879-5-ltaylorsimpson@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Hexagon (target/hexagon) Clean up .new decode and scripts | expand |
On Mon, 26 Feb 2024 13:17:17 -0700 Taylor Simpson <ltaylorsimpson@gmail.com> wrote: > > diff --git a/target/hexagon/gen_trans_funcs.py b/target/hexagon/gen_trans_funcs.py > index 07292e0170..f1972fd2dd 100755 > --- a/target/hexagon/gen_trans_funcs.py > +++ b/target/hexagon/gen_trans_funcs.py > @@ -86,6 +86,7 @@ def gen_trans_funcs(f): > > new_read_idx = -1 > dest_idx = -1 > + has_pred_dest = "false" > for regno, regstruct in enumerate(regs): > reg_type, reg_id, _, _ = regstruct > reg = hex_common.get_register(tag, reg_type, reg_id) > @@ -96,6 +97,8 @@ def gen_trans_funcs(f): > new_read_idx = regno > if reg.is_written() and dest_idx == -1: > dest_idx = regno > + if reg_type == "P" and not reg.is_read(): > + has_pred_dest = "true" I got a bit confused here. Why do we use "not reg.is_read()"? I though this would be "reg.is_written()".
> -----Original Message----- > From: Matheus Tavares Bernardino <quic_mathbern@quicinc.com> > Sent: Tuesday, February 27, 2024 8:21 AM > To: Taylor Simpson <ltaylorsimpson@gmail.com> > Cc: qemu-devel@nongnu.org; bcain@quicinc.com; > quic_mathbern@quicinc.com; sidneym@quicinc.com; > quic_mliebel@quicinc.com; richard.henderson@linaro.org; > philmd@linaro.org; ale@rev.ng; anjo@rev.ng > Subject: Re: [PATCH 4/9] Hexagon (target/hexagon) Mark has_pred_dest in > trans functions > > On Mon, 26 Feb 2024 13:17:17 -0700 Taylor Simpson > <ltaylorsimpson@gmail.com> wrote: > > > > diff --git a/target/hexagon/gen_trans_funcs.py > > b/target/hexagon/gen_trans_funcs.py > > index 07292e0170..f1972fd2dd 100755 > > --- a/target/hexagon/gen_trans_funcs.py > > +++ b/target/hexagon/gen_trans_funcs.py > > @@ -86,6 +86,7 @@ def gen_trans_funcs(f): > > > > new_read_idx = -1 > > dest_idx = -1 > > + has_pred_dest = "false" > > for regno, regstruct in enumerate(regs): > > reg_type, reg_id, _, _ = regstruct > > reg = hex_common.get_register(tag, reg_type, reg_id) @@ > > -96,6 +97,8 @@ def gen_trans_funcs(f): > > new_read_idx = regno > > if reg.is_written() and dest_idx == -1: > > dest_idx = regno > > + if reg_type == "P" and not reg.is_read(): > > + has_pred_dest = "true" > > I got a bit confused here. Why do we use "not reg.is_read()"? I though this > would be "reg.is_written()". The original C code is if ((strstr(opcode_wregs[opcode], "Pd4") || strstr(opcode_wregs[opcode], "Pe4")) && Checking for reg.is_written() would also match Px4, which is read-write. Would it be more clear if we checked for reg.is_written() and non reg.is_read()? Thanks, Taylor
diff --git a/target/hexagon/insn.h b/target/hexagon/insn.h index a770379958..24dcf7fe9f 100644 --- a/target/hexagon/insn.h +++ b/target/hexagon/insn.h @@ -41,6 +41,7 @@ struct Instruction { uint32_t new_value_producer_slot:4; int32_t new_read_idx; int32_t dest_idx; + bool has_pred_dest; bool part1; /* * cmp-jumps are split into two insns. diff --git a/target/hexagon/decode.c b/target/hexagon/decode.c index a4d8500fea..84a3899556 100644 --- a/target/hexagon/decode.c +++ b/target/hexagon/decode.c @@ -366,6 +366,9 @@ static void decode_shuffle_for_execution(Packet *packet) for (flag = false, i = 0; i < last_insn + 1; i++) { int opcode = packet->insn[i].opcode; + g_assert(packet->insn[i].has_pred_dest == + (strstr(opcode_wregs[opcode], "Pd4") || + strstr(opcode_wregs[opcode], "Pe4"))); if ((strstr(opcode_wregs[opcode], "Pd4") || strstr(opcode_wregs[opcode], "Pe4")) && GET_ATTRIB(opcode, A_STORE) == 0) { diff --git a/target/hexagon/gen_trans_funcs.py b/target/hexagon/gen_trans_funcs.py index 07292e0170..f1972fd2dd 100755 --- a/target/hexagon/gen_trans_funcs.py +++ b/target/hexagon/gen_trans_funcs.py @@ -86,6 +86,7 @@ def gen_trans_funcs(f): new_read_idx = -1 dest_idx = -1 + has_pred_dest = "false" for regno, regstruct in enumerate(regs): reg_type, reg_id, _, _ = regstruct reg = hex_common.get_register(tag, reg_type, reg_id) @@ -96,6 +97,8 @@ def gen_trans_funcs(f): new_read_idx = regno if reg.is_written() and dest_idx == -1: dest_idx = regno + if reg_type == "P" and not reg.is_read(): + has_pred_dest = "true" if len(imms) != 0: mark_which_imm_extended(f, tag) @@ -119,6 +122,7 @@ def gen_trans_funcs(f): f.write(code_fmt(f"""\ insn->new_read_idx = {new_read_idx}; insn->dest_idx = {dest_idx}; + insn->has_pred_dest = {has_pred_dest}; """)) f.write(textwrap.dedent(f"""\ return true;
Check that the value matches opcode_wregs Signed-off-by: Taylor Simpson <ltaylorsimpson@gmail.com> --- target/hexagon/insn.h | 1 + target/hexagon/decode.c | 3 +++ target/hexagon/gen_trans_funcs.py | 4 ++++ 3 files changed, 8 insertions(+)