[RFC PATCH 4/5] tcg: Restrict tcg_out_op() to arrays of TCG_MAX_OP_ARGS elements

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

tcg_reg_alloc_op() allocates arrays of TCG_MAX_OP_ARGS elements.

The Aarch64 target already does this since commit 8d8db193f25
("tcg-aarch64: Hoist common argument loads in tcg_out_op"),
SPARC since commit b357f902bff ("tcg-sparc: Hoist common argument
loads in tcg_out_op").

RISCV missed it upon introduction in commit bdf503819ee
("tcg/riscv: Add the out op decoder"), MIPS since commit
22ee3a987d5 ("tcg-mips: Hoist args loads") and i386 since
commit 42d5b514928 ("tcg/i386: Hoist common arguments in
tcg_out_op").

Provide this information as a hint to the compiler in the function
prototype, and update the funtion definitions.

This fixes this warning (using GCC 11):

    tcg/aarch64/tcg-target.c.inc:1855:37: error: argument 3 of type 'const TCGArg[16]' {aka 'const long unsigned int[16]'} with mismatched bound [-Werror=array-parameter=]
    tcg/aarch64/tcg-target.c.inc:1856:34: error: argument 4 of type 'const int[16]' with mismatched bound [-Werror=array-parameter=]

Reported-by: Miroslav Rezanina <mrezanin@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
RFC because such compiler hint is somehow "new" to me.

Also I expect this to be superseeded by Richard 'tcg constant'
branch mentioned here:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg771401.html
---
 tcg/tcg.c                  | 5 +++--
 tcg/i386/tcg-target.c.inc  | 3 ++-
 tcg/mips/tcg-target.c.inc  | 3 ++-
 tcg/riscv/tcg-target.c.inc | 3 ++-
 tcg/tci/tcg-target.c.inc   | 5 +++--
 5 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/tcg/tcg.c b/tcg/tcg.c
index 472bf1755bf..97d074d8fab 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -110,8 +110,9 @@ static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg1,
 static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg);
 static void tcg_out_movi(TCGContext *s, TCGType type,
                          TCGReg ret, tcg_target_long arg);
-static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
-                       const int *const_args);
+static void tcg_out_op(TCGContext *s, TCGOpcode opc,
+                       const TCGArg args[TCG_MAX_OP_ARGS],
+                       const int const_args[TCG_MAX_OP_ARGS]);
 #if TCG_TARGET_MAYBE_vec
 static bool tcg_out_dup_vec(TCGContext *s, TCGType type, unsigned vece,
                             TCGReg dst, TCGReg src);
diff --git a/tcg/i386/tcg-target.c.inc b/tcg/i386/tcg-target.c.inc
index 46e856f4421..d121dca8789 100644
--- a/tcg/i386/tcg-target.c.inc
+++ b/tcg/i386/tcg-target.c.inc
@@ -2215,7 +2215,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is64)
 }
 
 static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
-                              const TCGArg *args, const int *const_args)
+                              const TCGArg args[TCG_MAX_OP_ARGS],
+                              const int const_args[TCG_MAX_OP_ARGS])
 {
     TCGArg a0, a1, a2;
     int c, const_a2, vexop, rexw = 0;
diff --git a/tcg/mips/tcg-target.c.inc b/tcg/mips/tcg-target.c.inc
index add157f6c32..b9bb54f0ecc 100644
--- a/tcg/mips/tcg-target.c.inc
+++ b/tcg/mips/tcg-target.c.inc
@@ -1691,7 +1691,8 @@ static void tcg_out_clz(TCGContext *s, MIPSInsn opcv2, MIPSInsn opcv6,
 }
 
 static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
-                              const TCGArg *args, const int *const_args)
+                              const TCGArg args[TCG_MAX_OP_ARGS],
+                              const int const_args[TCG_MAX_OP_ARGS])
 {
     MIPSInsn i1, i2;
     TCGArg a0, a1, a2;
diff --git a/tcg/riscv/tcg-target.c.inc b/tcg/riscv/tcg-target.c.inc
index c60b91ba58f..5bf0d069532 100644
--- a/tcg/riscv/tcg-target.c.inc
+++ b/tcg/riscv/tcg-target.c.inc
@@ -1238,7 +1238,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is_64)
 static const tcg_insn_unit *tb_ret_addr;
 
 static void tcg_out_op(TCGContext *s, TCGOpcode opc,
-                       const TCGArg *args, const int *const_args)
+                       const TCGArg args[TCG_MAX_OP_ARGS],
+                       const int const_args[TCG_MAX_OP_ARGS])
 {
     TCGArg a0 = args[0];
     TCGArg a1 = args[1];
diff --git a/tcg/tci/tcg-target.c.inc b/tcg/tci/tcg-target.c.inc
index d5a4d9d37cf..60464524f3d 100644
--- a/tcg/tci/tcg-target.c.inc
+++ b/tcg/tci/tcg-target.c.inc
@@ -553,8 +553,9 @@ static inline void tcg_out_call(TCGContext *s, const tcg_insn_unit *arg)
     old_code_ptr[1] = s->code_ptr - old_code_ptr;
 }
 
-static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
-                       const int *const_args)
+static void tcg_out_op(TCGContext *s, TCGOpcode opc,
+                       const TCGArg args[TCG_MAX_OP_ARGS],
+                       const int const_args[TCG_MAX_OP_ARGS])
 {
     uint8_t *old_code_ptr = s->code_ptr;
 
-- 
2.26.2