tcg: Introduce tcg_target_has_memory_bswap

Replace the unparameterized TCG_TARGET_HAS_MEMORY_BSWAP macro
with a function with a memop argument.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/aarch64/tcg-target.c.inc

@@ -1595,6 +1595,11 @@ typedef struct {
     TCGType index_ext;
 } HostAddress;
 
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return false;
+}
+
 static const TCGLdstHelperParam ldst_helper_param = {
     .ntmp = 1, .tmp = { TCG_REG_TMP }
 };

tcg/aarch64/tcg-target.h

@@ -154,7 +154,6 @@ extern bool have_lse2;
 #define TCG_TARGET_HAS_cmpsel_vec       0
 
 #define TCG_TARGET_DEFAULT_MO (0)
-#define TCG_TARGET_HAS_MEMORY_BSWAP     0
 #define TCG_TARGET_NEED_LDST_LABELS
 #define TCG_TARGET_NEED_POOL_LABELS
 

tcg/arm/tcg-target.c.inc

@@ -1325,6 +1325,11 @@ typedef struct {
     bool index_scratch;
 } HostAddress;
 
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return false;
+}
+
 static TCGReg ldst_ra_gen(TCGContext *s, const TCGLabelQemuLdst *l, int arg)
 {
     /* We arrive at the slow path via "BLNE", so R14 contains l->raddr. */

tcg/arm/tcg-target.h

@@ -150,7 +150,6 @@ extern bool use_neon_instructions;
 #define TCG_TARGET_HAS_cmpsel_vec       0
 
 #define TCG_TARGET_DEFAULT_MO (0)
-#define TCG_TARGET_HAS_MEMORY_BSWAP     0
 #define TCG_TARGET_NEED_LDST_LABELS
 #define TCG_TARGET_NEED_POOL_LABELS
 

tcg/i386/tcg-target.c.inc

@@ -1776,6 +1776,11 @@ typedef struct {
     int seg;
 } HostAddress;
 
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return have_movbe;
+}
+
 /*
  * Because i686 has no register parameters and because x86_64 has xchg
  * to handle addr/data register overlap, we have placed all input arguments

tcg/i386/tcg-target.h

@@ -240,9 +240,6 @@ extern bool have_atomic16;
 #include "tcg/tcg-mo.h"
 
 #define TCG_TARGET_DEFAULT_MO (TCG_MO_ALL & ~TCG_MO_ST_LD)
-
-#define TCG_TARGET_HAS_MEMORY_BSWAP  have_movbe
-
 #define TCG_TARGET_NEED_LDST_LABELS
 #define TCG_TARGET_NEED_POOL_LABELS
 

tcg/loongarch64/tcg-target.c.inc

@@ -828,6 +828,11 @@ typedef struct {
     TCGReg index;
 } HostAddress;
 
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return false;
+}
+
 /*
  * For softmmu, perform the TLB load and compare.
  * For useronly, perform any required alignment tests.

tcg/loongarch64/tcg-target.h

@@ -173,6 +173,4 @@ typedef enum {
 
 #define TCG_TARGET_NEED_LDST_LABELS
 
-#define TCG_TARGET_HAS_MEMORY_BSWAP 0
-
 #endif /* LOONGARCH_TCG_TARGET_H */

tcg/mips/tcg-target.c.inc

@@ -1141,6 +1141,11 @@ typedef struct {
     MemOp align;
 } HostAddress;
 
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return false;
+}
+
 /*
  * For softmmu, perform the TLB load and compare.
  * For useronly, perform any required alignment tests.

tcg/mips/tcg-target.h

@@ -205,8 +205,6 @@ extern bool use_mips32r2_instructions;
 #endif
 
 #define TCG_TARGET_DEFAULT_MO           0
-#define TCG_TARGET_HAS_MEMORY_BSWAP     0
-
 #define TCG_TARGET_NEED_LDST_LABELS
 
 #endif

tcg/ppc/tcg-target.c.inc

@@ -2017,6 +2017,11 @@ typedef struct {
     TCGReg index;
 } HostAddress;
 
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return true;
+}
+
 /*
  * For softmmu, perform the TLB load and compare.
  * For useronly, perform any required alignment tests.

tcg/ppc/tcg-target.h

@@ -179,7 +179,6 @@ extern bool have_vsx;
 #define TCG_TARGET_HAS_cmpsel_vec       0
 
 #define TCG_TARGET_DEFAULT_MO (0)
-#define TCG_TARGET_HAS_MEMORY_BSWAP     1
 #define TCG_TARGET_NEED_LDST_LABELS
 #define TCG_TARGET_NEED_POOL_LABELS
 

tcg/riscv/tcg-target.c.inc

@@ -853,6 +853,11 @@ static void tcg_out_goto(TCGContext *s, const tcg_insn_unit *target)
     tcg_debug_assert(ok);
 }
 
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return false;
+}
+
 /* We have three temps, we might as well expose them. */
 static const TCGLdstHelperParam ldst_helper_param = {
     .ntmp = 3, .tmp = { TCG_REG_TMP0, TCG_REG_TMP1, TCG_REG_TMP2 }

tcg/riscv/tcg-target.h

@@ -168,6 +168,4 @@ typedef enum {
 #define TCG_TARGET_NEED_LDST_LABELS
 #define TCG_TARGET_NEED_POOL_LABELS
 
-#define TCG_TARGET_HAS_MEMORY_BSWAP 0
-
 #endif

tcg/s390x/tcg-target.c.inc

@@ -1574,6 +1574,11 @@ typedef struct {
     int disp;
 } HostAddress;
 
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return true;
+}
+
 static void tcg_out_qemu_ld_direct(TCGContext *s, MemOp opc, TCGReg data,
                                    HostAddress h)
 {

tcg/s390x/tcg-target.h

@@ -172,8 +172,6 @@ extern uint64_t s390_facilities[3];
 #define TCG_TARGET_CALL_ARG_I128        TCG_CALL_ARG_BY_REF
 #define TCG_TARGET_CALL_RET_I128        TCG_CALL_RET_BY_REF
 
-#define TCG_TARGET_HAS_MEMORY_BSWAP   1
-
 #define TCG_TARGET_DEFAULT_MO (TCG_MO_ALL & ~TCG_MO_ST_LD)
 #define TCG_TARGET_NEED_LDST_LABELS
 #define TCG_TARGET_NEED_POOL_LABELS

tcg/sparc64/tcg-target.c.inc

@@ -1011,6 +1011,11 @@ typedef struct {
     TCGReg index;
 } HostAddress;
 
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return true;
+}
+
 /*
  * For softmmu, perform the TLB load and compare.
  * For useronly, perform any required alignment tests.

tcg/sparc64/tcg-target.h

@@ -154,7 +154,6 @@ extern bool use_vis3_instructions;
 #define TCG_AREG0 TCG_REG_I0
 
 #define TCG_TARGET_DEFAULT_MO (0)
-#define TCG_TARGET_HAS_MEMORY_BSWAP     1
 #define TCG_TARGET_NEED_LDST_LABELS
 #define TCG_TARGET_NEED_POOL_LABELS
 

tcg/tcg-internal.h

@@ -126,4 +126,6 @@ static inline TCGv_i64 TCGV128_HIGH(TCGv_i128 t)
     return temp_tcgv_i64(tcgv_i128_temp(t) + o);
 }
 
+bool tcg_target_has_memory_bswap(MemOp memop);
+
 #endif /* TCG_INTERNAL_H */

tcg/tcg-op.c

@@ -2959,7 +2959,7 @@ void tcg_gen_qemu_ld_i32(TCGv_i32 val, TCGv addr, TCGArg idx, MemOp memop)
     oi = make_memop_idx(memop, idx);
 
     orig_memop = memop;
-    if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
+    if ((memop & MO_BSWAP) && !tcg_target_has_memory_bswap(memop)) {
         memop &= ~MO_BSWAP;
         /* The bswap primitive benefits from zero-extended input.  */
         if ((memop & MO_SSIZE) == MO_SW) {
@@ -2996,7 +2996,7 @@ void tcg_gen_qemu_st_i32(TCGv_i32 val, TCGv addr, TCGArg idx, MemOp memop)
     memop = tcg_canonicalize_memop(memop, 0, 1);
     oi = make_memop_idx(memop, idx);
 
-    if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
+    if ((memop & MO_BSWAP) && !tcg_target_has_memory_bswap(memop)) {
         swap = tcg_temp_ebb_new_i32();
         switch (memop & MO_SIZE) {
         case MO_16:
@@ -3045,7 +3045,7 @@ void tcg_gen_qemu_ld_i64(TCGv_i64 val, TCGv addr, TCGArg idx, MemOp memop)
     oi = make_memop_idx(memop, idx);
 
     orig_memop = memop;
-    if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
+    if ((memop & MO_BSWAP) && !tcg_target_has_memory_bswap(memop)) {
         memop &= ~MO_BSWAP;
         /* The bswap primitive benefits from zero-extended input.  */
         if ((memop & MO_SIGN) && (memop & MO_SIZE) < MO_64) {
@@ -3091,7 +3091,7 @@ void tcg_gen_qemu_st_i64(TCGv_i64 val, TCGv addr, TCGArg idx, MemOp memop)
     memop = tcg_canonicalize_memop(memop, 1, 1);
     oi = make_memop_idx(memop, idx);
 
-    if (!TCG_TARGET_HAS_MEMORY_BSWAP && (memop & MO_BSWAP)) {
+    if ((memop & MO_BSWAP) && !tcg_target_has_memory_bswap(memop)) {
         swap = tcg_temp_ebb_new_i64();
         switch (memop & MO_SIZE) {
         case MO_16:
@@ -3157,11 +3157,6 @@ static void canonicalize_memop_i128_as_i64(MemOp ret[2], MemOp orig)
     tcg_debug_assert((orig & MO_SIZE) == MO_128);
     tcg_debug_assert((orig & MO_SIGN) == 0);
 
-    /* Use a memory ordering implemented by the host. */
-    if (!TCG_TARGET_HAS_MEMORY_BSWAP && (orig & MO_BSWAP)) {
-        mop_1 &= ~MO_BSWAP;
-    }
-
     /* Reduce the size to 64-bit. */
     mop_1 = (mop_1 & ~MO_SIZE) | MO_64;
 
@@ -3191,6 +3186,13 @@ static void canonicalize_memop_i128_as_i64(MemOp ret[2], MemOp orig)
     default:
         g_assert_not_reached();
     }
+
+    /* Use a memory ordering implemented by the host. */
+    if ((orig & MO_BSWAP) && !tcg_target_has_memory_bswap(mop_1)) {
+        mop_1 &= ~MO_BSWAP;
+        mop_2 &= ~MO_BSWAP;
+    }
+
     ret[0] = mop_1;
     ret[1] = mop_2;
 }

tcg/tci/tcg-target.c.inc

@@ -963,3 +963,8 @@ static void tcg_target_init(TCGContext *s)
 static inline void tcg_target_qemu_prologue(TCGContext *s)
 {
 }
+
+bool tcg_target_has_memory_bswap(MemOp memop)
+{
+    return true;
+}

tcg/tci/tcg-target.h

@@ -176,6 +176,4 @@ typedef enum {
    We prefer consistency across hosts on this.  */
 #define TCG_TARGET_DEFAULT_MO  (0)
 
-#define TCG_TARGET_HAS_MEMORY_BSWAP     1
-
 #endif /* TCG_TARGET_H */