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Hexagon (target/hexagon) Change decision to set pkt_has_store_s[01]

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We have found cases where pkt_has_store_s[01] is set incorrectly.
This leads to generating an unnecessary store that is left over
from a previous packet.

Add an attribute to determine if an instruction is a scalar store
The attribute is attached to the fSTORE macro (hex_common.py)
Update the logic in decode.c that sets pkt_has_store_s[01]

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220920080746.26791-4-tsimpson@quicinc.com>
This commit is contained in:
Taylor Simpson 2022-09-20 01:07:46 -07:00
parent b772528acb
commit e2be9a5c5f
4 changed files with 17 additions and 10 deletions
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1
target/hexagon/attribs_def.h.inc
View File

@ -44,6 +44,7 @@ DEF_ATTRIB(MEMSIZE_1B, "Memory width is 1 byte", "", "")
DEF_ATTRIB(MEMSIZE_2B, "Memory width is 2 bytes", "", "")
DEF_ATTRIB(MEMSIZE_4B, "Memory width is 4 bytes", "", "")
DEF_ATTRIB(MEMSIZE_8B, "Memory width is 8 bytes", "", "")
DEF_ATTRIB(SCALAR_STORE, "Store is scalar", "", "")
DEF_ATTRIB(REGWRSIZE_1B, "Memory width is 1 byte", "", "")
DEF_ATTRIB(REGWRSIZE_2B, "Memory width is 2 bytes", "", "")
DEF_ATTRIB(REGWRSIZE_4B, "Memory width is 4 bytes", "", "")

13
target/hexagon/decode.c
View File

@ -1,5 +1,5 @@
/*
* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
* Copyright(c) 2019-2022 Qualcomm Innovation Center, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -402,10 +402,13 @@ static void decode_set_insn_attr_fields(Packet *pkt)
}
if (GET_ATTRIB(opcode, A_STORE)) {
if (pkt->insn[i].slot == 0) {
pkt->pkt_has_store_s0 = true;
} else {
pkt->pkt_has_store_s1 = true;
if (GET_ATTRIB(opcode, A_SCALAR_STORE) &&
!GET_ATTRIB(opcode, A_MEMSIZE_0B)) {
if (pkt->insn[i].slot == 0) {
pkt->pkt_has_store_s0 = true;
} else {
pkt->pkt_has_store_s1 = true;
}
}
}

3
target/hexagon/hex_common.py
View File

@ -1,7 +1,7 @@
#!/usr/bin/env python3
##
## Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
## Copyright(c) 2019-2022 Qualcomm Innovation Center, Inc. All Rights Reserved.
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
@ -75,6 +75,7 @@ def calculate_attribs():
add_qemu_macro_attrib('fWRITE_P3', 'A_WRITES_PRED_REG')
add_qemu_macro_attrib('fSET_OVERFLOW', 'A_IMPLICIT_WRITES_USR')
add_qemu_macro_attrib('fSET_LPCFG', 'A_IMPLICIT_WRITES_USR')
add_qemu_macro_attrib('fSTORE', 'A_SCALAR_STORE')
# Recurse down macros, find attributes from sub-macros
macroValues = list(macros.values())

10
target/hexagon/translate.c
View File

@ -1,5 +1,5 @@
/*
* Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
* Copyright(c) 2019-2022 Qualcomm Innovation Center, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -499,10 +499,12 @@ static void process_store_log(DisasContext *ctx, Packet *pkt)
* slot 1 and then slot 0. This will be important when
* the memory accesses overlap.
*/
if (pkt->pkt_has_store_s1 && !pkt->pkt_has_dczeroa) {
if (pkt->pkt_has_store_s1) {
g_assert(!pkt->pkt_has_dczeroa);
process_store(ctx, pkt, 1);
}
if (pkt->pkt_has_store_s0 && !pkt->pkt_has_dczeroa) {
if (pkt->pkt_has_store_s0) {
g_assert(!pkt->pkt_has_dczeroa);
process_store(ctx, pkt, 0);
}
}
@ -665,7 +667,7 @@ static void gen_commit_packet(CPUHexagonState *env, DisasContext *ctx,
* The dczeroa will be the store in slot 0, check that we don't have
* a store in slot 1 or an HVX store.
*/
g_assert(has_store_s0 && !has_store_s1 && !has_hvx_store);
g_assert(!has_store_s1 && !has_hvx_store);
process_dczeroa(ctx, pkt);
} else if (has_hvx_store) {
TCGv mem_idx = tcg_constant_tl(ctx->mem_idx);