Hexagon (target/hexagon) move store size tracking to translation

The store width is needed for packet commit, so it is stored in
ctx->store_width.  Currently, it is set when a store has a TCG
override instead of a QEMU helper.  In the QEMU helper case, the
ctx->store_width is not set, we invoke a helper during packet commit
that uses the runtime store width.

This patch ensures ctx->store_width is set for all store instructions,
so performance is improved because packet commit can generate the proper
TCG store rather than the generic helper.

We do this by
- Use the attributes from the instructions during translation to
  set ctx->store_width
- Remove setting of ctx->store_width from genptr.c

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220920080746.26791-3-tsimpson@quicinc.com>

3 files changed, 41 insertions, 28 deletions

diff --git a/target/hexagon/genptr.c b/target/hexagon/genptr.c
index 8a334ba07b..806d0974ff 100644
--- a/target/hexagon/genptr.c
+++ b/target/hexagon/genptr.c
@@ -401,62 +401,50 @@ static inline void gen_store32(TCGv vaddr, TCGv src, int width, int slot)
     tcg_gen_mov_tl(hex_store_val32[slot], src);
 }
 
-static inline void gen_store1(TCGv_env cpu_env, TCGv vaddr, TCGv src,
-                              DisasContext *ctx, int slot)
+static inline void gen_store1(TCGv_env cpu_env, TCGv vaddr, TCGv src, int slot)
 {
     gen_store32(vaddr, src, 1, slot);
-    ctx->store_width[slot] = 1;
 }
 
-static inline void gen_store1i(TCGv_env cpu_env, TCGv vaddr, int32_t src,
-                               DisasContext *ctx, int slot)
+static inline void gen_store1i(TCGv_env cpu_env, TCGv vaddr, int32_t src, int slot)
 {
     TCGv tmp = tcg_constant_tl(src);
-    gen_store1(cpu_env, vaddr, tmp, ctx, slot);
+    gen_store1(cpu_env, vaddr, tmp, slot);
 }
 
-static inline void gen_store2(TCGv_env cpu_env, TCGv vaddr, TCGv src,
-                              DisasContext *ctx, int slot)
+static inline void gen_store2(TCGv_env cpu_env, TCGv vaddr, TCGv src, int slot)
 {
     gen_store32(vaddr, src, 2, slot);
-    ctx->store_width[slot] = 2;
 }
 
-static inline void gen_store2i(TCGv_env cpu_env, TCGv vaddr, int32_t src,
-                               DisasContext *ctx, int slot)
+static inline void gen_store2i(TCGv_env cpu_env, TCGv vaddr, int32_t src, int slot)
 {
     TCGv tmp = tcg_constant_tl(src);
-    gen_store2(cpu_env, vaddr, tmp, ctx, slot);
+    gen_store2(cpu_env, vaddr, tmp, slot);
 }
 
-static inline void gen_store4(TCGv_env cpu_env, TCGv vaddr, TCGv src,
-                              DisasContext *ctx, int slot)
+static inline void gen_store4(TCGv_env cpu_env, TCGv vaddr, TCGv src, int slot)
 {
     gen_store32(vaddr, src, 4, slot);
-    ctx->store_width[slot] = 4;
 }
 
-static inline void gen_store4i(TCGv_env cpu_env, TCGv vaddr, int32_t src,
-                               DisasContext *ctx, int slot)
+static inline void gen_store4i(TCGv_env cpu_env, TCGv vaddr, int32_t src, int slot)
 {
     TCGv tmp = tcg_constant_tl(src);
-    gen_store4(cpu_env, vaddr, tmp, ctx, slot);
+    gen_store4(cpu_env, vaddr, tmp, slot);
 }
 
-static inline void gen_store8(TCGv_env cpu_env, TCGv vaddr, TCGv_i64 src,
-                              DisasContext *ctx, int slot)
+static inline void gen_store8(TCGv_env cpu_env, TCGv vaddr, TCGv_i64 src, int slot)
 {
     tcg_gen_mov_tl(hex_store_addr[slot], vaddr);
     tcg_gen_movi_tl(hex_store_width[slot], 8);
     tcg_gen_mov_i64(hex_store_val64[slot], src);
-    ctx->store_width[slot] = 8;
 }
 
-static inline void gen_store8i(TCGv_env cpu_env, TCGv vaddr, int64_t src,
-                               DisasContext *ctx, int slot)
+static inline void gen_store8i(TCGv_env cpu_env, TCGv vaddr, int64_t src, int slot)
 {
     TCGv_i64 tmp = tcg_constant_i64(src);
-    gen_store8(cpu_env, vaddr, tmp, ctx, slot);
+    gen_store8(cpu_env, vaddr, tmp, slot);
 }
 
 static TCGv gen_8bitsof(TCGv result, TCGv value)
diff --git a/target/hexagon/macros.h b/target/hexagon/macros.h
index 92eb8bbf05..c8805bdaeb 100644
--- a/target/hexagon/macros.h
+++ b/target/hexagon/macros.h
@@ -156,7 +156,7 @@
         __builtin_choose_expr(TYPE_TCGV(X), \
             gen_store1, (void)0))
 #define MEM_STORE1(VA, DATA, SLOT) \
-    MEM_STORE1_FUNC(DATA)(cpu_env, VA, DATA, ctx, SLOT)
+    MEM_STORE1_FUNC(DATA)(cpu_env, VA, DATA, SLOT)
 
 #define MEM_STORE2_FUNC(X) \
     __builtin_choose_expr(TYPE_INT(X), \
@@ -164,7 +164,7 @@
         __builtin_choose_expr(TYPE_TCGV(X), \
             gen_store2, (void)0))
 #define MEM_STORE2(VA, DATA, SLOT) \
-    MEM_STORE2_FUNC(DATA)(cpu_env, VA, DATA, ctx, SLOT)
+    MEM_STORE2_FUNC(DATA)(cpu_env, VA, DATA, SLOT)
 
 #define MEM_STORE4_FUNC(X) \
     __builtin_choose_expr(TYPE_INT(X), \
@@ -172,7 +172,7 @@
         __builtin_choose_expr(TYPE_TCGV(X), \
             gen_store4, (void)0))
 #define MEM_STORE4(VA, DATA, SLOT) \
-    MEM_STORE4_FUNC(DATA)(cpu_env, VA, DATA, ctx, SLOT)
+    MEM_STORE4_FUNC(DATA)(cpu_env, VA, DATA, SLOT)
 
 #define MEM_STORE8_FUNC(X) \
     __builtin_choose_expr(TYPE_INT(X), \
@@ -180,7 +180,7 @@
         __builtin_choose_expr(TYPE_TCGV_I64(X), \
             gen_store8, (void)0))
 #define MEM_STORE8(VA, DATA, SLOT) \
-    MEM_STORE8_FUNC(DATA)(cpu_env, VA, DATA, ctx, SLOT)
+    MEM_STORE8_FUNC(DATA)(cpu_env, VA, DATA, SLOT)
 #else
 #define MEM_LOAD1s(VA) ((int8_t)mem_load1(env, slot, VA))
 #define MEM_LOAD1u(VA) ((uint8_t)mem_load1(env, slot, VA))
diff --git a/target/hexagon/translate.c b/target/hexagon/translate.c
index b6b834b4ee..2329177537 100644
--- a/target/hexagon/translate.c
+++ b/target/hexagon/translate.c
@@ -327,6 +327,30 @@ static void mark_implicit_pred_writes(DisasContext *ctx, Insn *insn)
     mark_implicit_pred_write(ctx, insn, A_IMPLICIT_WRITES_P3, 3);
 }
 
+static void mark_store_width(DisasContext *ctx, Insn *insn)
+{
+    uint16_t opcode = insn->opcode;
+    uint32_t slot = insn->slot;
+    uint8_t width = 0;
+
+    if (GET_ATTRIB(opcode, A_SCALAR_STORE)) {
+        if (GET_ATTRIB(opcode, A_MEMSIZE_1B)) {
+            width |= 1;
+        }
+        if (GET_ATTRIB(opcode, A_MEMSIZE_2B)) {
+            width |= 2;
+        }
+        if (GET_ATTRIB(opcode, A_MEMSIZE_4B)) {
+            width |= 4;
+        }
+        if (GET_ATTRIB(opcode, A_MEMSIZE_8B)) {
+            width |= 8;
+        }
+        tcg_debug_assert(is_power_of_2(width));
+        ctx->store_width[slot] = width;
+    }
+}
+
 static void gen_insn(CPUHexagonState *env, DisasContext *ctx,
                      Insn *insn, Packet *pkt)
 {
@@ -334,6 +358,7 @@ static void gen_insn(CPUHexagonState *env, DisasContext *ctx,
         mark_implicit_reg_writes(ctx, insn);
         insn->generate(env, ctx, insn, pkt);
         mark_implicit_pred_writes(ctx, insn);
+        mark_store_width(ctx, insn);
     } else {
         gen_exception_end_tb(ctx, HEX_EXCP_INVALID_OPCODE);
     }