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tcg/aarch64: Unset TCG_TARGET_HAS_MEMORY_BSWAP
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The memory bswap support in the aarch64 backend merely dates from
a time when it was required.  There is nothing special about the
backend support that could not have been provided by the middle-end
even prior to the introduction of the bswap flags.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@rth7680
rth7680 committed Jun 29, 2021
1 parent 843b824 commit 51c559c
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Showing 2 changed files with 32 additions and 57 deletions.
87 changes: 31 additions & 56 deletions tcg/aarch64/tcg-target.c.inc
View file
Expand Up @@ -1547,28 +1547,34 @@ static void tcg_out_cltz(TCGContext *s, TCGType ext, TCGReg d,
/* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
* TCGMemOpIdx oi, uintptr_t ra)
*/
static void * const qemu_ld_helpers[16] = {
[MO_UB] = helper_ret_ldub_mmu,
[MO_LEUW] = helper_le_lduw_mmu,
[MO_LEUL] = helper_le_ldul_mmu,
[MO_LEQ] = helper_le_ldq_mmu,
[MO_BEUW] = helper_be_lduw_mmu,
[MO_BEUL] = helper_be_ldul_mmu,
[MO_BEQ] = helper_be_ldq_mmu,
static void * const qemu_ld_helpers[4] = {
[MO_8] = helper_ret_ldub_mmu,
#ifdef HOST_WORDS_BIGENDIAN
[MO_16] = helper_be_lduw_mmu,
[MO_32] = helper_be_ldul_mmu,
[MO_64] = helper_be_ldq_mmu,
#else
[MO_16] = helper_le_lduw_mmu,
[MO_32] = helper_le_ldul_mmu,
[MO_64] = helper_le_ldq_mmu,
#endif
};

/* helper signature: helper_ret_st_mmu(CPUState *env, target_ulong addr,
* uintxx_t val, TCGMemOpIdx oi,
* uintptr_t ra)
*/
static void * const qemu_st_helpers[16] = {
[MO_UB] = helper_ret_stb_mmu,
[MO_LEUW] = helper_le_stw_mmu,
[MO_LEUL] = helper_le_stl_mmu,
[MO_LEQ] = helper_le_stq_mmu,
[MO_BEUW] = helper_be_stw_mmu,
[MO_BEUL] = helper_be_stl_mmu,
[MO_BEQ] = helper_be_stq_mmu,
static void * const qemu_st_helpers[4] = {
[MO_8] = helper_ret_stb_mmu,
#ifdef HOST_WORDS_BIGENDIAN
[MO_16] = helper_be_stw_mmu,
[MO_32] = helper_be_stl_mmu,
[MO_64] = helper_be_stq_mmu,
#else
[MO_16] = helper_le_stw_mmu,
[MO_32] = helper_le_stl_mmu,
[MO_64] = helper_le_stq_mmu,
#endif
};

static inline void tcg_out_adr(TCGContext *s, TCGReg rd, const void *target)
Expand All @@ -1592,7 +1598,7 @@ static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
tcg_out_mov(s, TARGET_LONG_BITS == 64, TCG_REG_X1, lb->addrlo_reg);
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_X2, oi);
tcg_out_adr(s, TCG_REG_X3, lb->raddr);
tcg_out_call(s, qemu_ld_helpers[opc & (MO_BSWAP | MO_SIZE)]);
tcg_out_call(s, qemu_ld_helpers[opc & MO_SIZE]);
if (opc & MO_SIGN) {
tcg_out_sxt(s, lb->type, size, lb->datalo_reg, TCG_REG_X0);
} else {
Expand All @@ -1618,7 +1624,7 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
tcg_out_mov(s, size == MO_64, TCG_REG_X2, lb->datalo_reg);
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_X3, oi);
tcg_out_adr(s, TCG_REG_X4, lb->raddr);
tcg_out_call(s, qemu_st_helpers[opc & (MO_BSWAP | MO_SIZE)]);
tcg_out_call(s, qemu_st_helpers[opc & MO_SIZE]);
tcg_out_goto(s, lb->raddr);
return true;
}
Expand Down Expand Up @@ -1714,7 +1720,8 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, MemOp memop, TCGType ext,
TCGReg data_r, TCGReg addr_r,
TCGType otype, TCGReg off_r)
{
const MemOp bswap = memop & MO_BSWAP;
/* Byte swapping is left to middle-end expansion. */
tcg_debug_assert((memop & MO_BSWAP) == 0);

switch (memop & MO_SSIZE) {
case MO_UB:
Expand All @@ -1726,40 +1733,19 @@ static void tcg_out_qemu_ld_direct(TCGContext *s, MemOp memop, TCGType ext,
break;
case MO_UW:
tcg_out_ldst_r(s, I3312_LDRH, data_r, addr_r, otype, off_r);
if (bswap) {
tcg_out_rev(s, TCG_TYPE_I32, MO_16, data_r, data_r);
}
break;
case MO_SW:
if (bswap) {
tcg_out_ldst_r(s, I3312_LDRH, data_r, addr_r, otype, off_r);
tcg_out_rev(s, TCG_TYPE_I32, MO_16, data_r, data_r);
tcg_out_sxt(s, ext, MO_16, data_r, data_r);
} else {
tcg_out_ldst_r(s, (ext ? I3312_LDRSHX : I3312_LDRSHW),
data_r, addr_r, otype, off_r);
}
tcg_out_ldst_r(s, (ext ? I3312_LDRSHX : I3312_LDRSHW),
data_r, addr_r, otype, off_r);
break;
case MO_UL:
tcg_out_ldst_r(s, I3312_LDRW, data_r, addr_r, otype, off_r);
if (bswap) {
tcg_out_rev(s, TCG_TYPE_I32, MO_32, data_r, data_r);
}
break;
case MO_SL:
if (bswap) {
tcg_out_ldst_r(s, I3312_LDRW, data_r, addr_r, otype, off_r);
tcg_out_rev(s, TCG_TYPE_I32, MO_32, data_r, data_r);
tcg_out_sxt(s, TCG_TYPE_I64, MO_32, data_r, data_r);
} else {
tcg_out_ldst_r(s, I3312_LDRSWX, data_r, addr_r, otype, off_r);
}
tcg_out_ldst_r(s, I3312_LDRSWX, data_r, addr_r, otype, off_r);
break;
case MO_Q:
tcg_out_ldst_r(s, I3312_LDRX, data_r, addr_r, otype, off_r);
if (bswap) {
tcg_out_rev(s, TCG_TYPE_I64, MO_64, data_r, data_r);
}
break;
default:
tcg_abort();
Expand All @@ -1770,31 +1756,20 @@ static void tcg_out_qemu_st_direct(TCGContext *s, MemOp memop,
TCGReg data_r, TCGReg addr_r,
TCGType otype, TCGReg off_r)
{
const MemOp bswap = memop & MO_BSWAP;
/* Byte swapping is left to middle-end expansion. */
tcg_debug_assert((memop & MO_BSWAP) == 0);

switch (memop & MO_SIZE) {
case MO_8:
tcg_out_ldst_r(s, I3312_STRB, data_r, addr_r, otype, off_r);
break;
case MO_16:
if (bswap && data_r != TCG_REG_XZR) {
tcg_out_rev(s, TCG_TYPE_I32, MO_16, TCG_REG_TMP, data_r);
data_r = TCG_REG_TMP;
}
tcg_out_ldst_r(s, I3312_STRH, data_r, addr_r, otype, off_r);
break;
case MO_32:
if (bswap && data_r != TCG_REG_XZR) {
tcg_out_rev(s, TCG_TYPE_I32, MO_32, TCG_REG_TMP, data_r);
data_r = TCG_REG_TMP;
}
tcg_out_ldst_r(s, I3312_STRW, data_r, addr_r, otype, off_r);
break;
case MO_64:
if (bswap && data_r != TCG_REG_XZR) {
tcg_out_rev(s, TCG_TYPE_I64, MO_64, TCG_REG_TMP, data_r);
data_r = TCG_REG_TMP;
}
tcg_out_ldst_r(s, I3312_STRX, data_r, addr_r, otype, off_r);
break;
default:
Expand Down
2 changes: 1 addition & 1 deletion tcg/aarch64/tcg-target.h
View file
Expand Up @@ -148,7 +148,7 @@ typedef enum {
#define TCG_TARGET_HAS_cmpsel_vec 0

#define TCG_TARGET_DEFAULT_MO (0)
#define TCG_TARGET_HAS_MEMORY_BSWAP 1
#define TCG_TARGET_HAS_MEMORY_BSWAP 0

void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t);

Expand Down

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