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tcg/arm: Reserve a register for guest_base 

Reserve a register for the guest_base using aarch64 for reference.
By doing so, we do not have to recompute it for every memory load.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-08-09 17:44:50 -10:00
parent 8821ec2323
commit 4bb802073f
1 changed files with 28 additions and 11 deletions
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39
tcg/arm/tcg-target.c.inc
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@ -84,6 +84,9 @@ static const int tcg_target_call_oarg_regs[2] = {
#define TCG_REG_TMP TCG_REG_R12
#define TCG_VEC_TMP TCG_REG_Q15
#ifndef CONFIG_SOFTMMU
#define TCG_REG_GUEST_BASE TCG_REG_R11
#endif
typedef enum {
COND_EQ = 0x0,
@ -1593,7 +1596,8 @@ static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *lb)
static void tcg_out_qemu_ld_index(TCGContext *s, MemOp opc,
TCGReg datalo, TCGReg datahi,
TCGReg addrlo, TCGReg addend)
TCGReg addrlo, TCGReg addend,
bool scratch_addend)
{
/* Byte swapping is left to middle-end expansion. */
tcg_debug_assert((opc & MO_BSWAP) == 0);
@ -1619,7 +1623,7 @@ static void tcg_out_qemu_ld_index(TCGContext *s, MemOp opc,
if (get_alignment_bits(opc) >= MO_64
&& (datalo & 1) == 0 && datahi == datalo + 1) {
tcg_out_ldrd_r(s, COND_AL, datalo, addrlo, addend);
} else if (datalo != addend) {
} else if (scratch_addend) {
tcg_out_ld32_rwb(s, COND_AL, datalo, addend, addrlo);
tcg_out_ld32_12(s, COND_AL, datahi, addend, 4);
} else {
@ -1703,14 +1707,14 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is64)
label_ptr = s->code_ptr;
tcg_out_bl_imm(s, COND_NE, 0);
tcg_out_qemu_ld_index(s, opc, datalo, datahi, addrlo, addend);
tcg_out_qemu_ld_index(s, opc, datalo, datahi, addrlo, addend, true);
add_qemu_ldst_label(s, true, oi, datalo, datahi, addrlo, addrhi,
s->code_ptr, label_ptr);
#else /* !CONFIG_SOFTMMU */
if (guest_base) {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP, guest_base);
tcg_out_qemu_ld_index(s, opc, datalo, datahi, addrlo, TCG_REG_TMP);
tcg_out_qemu_ld_index(s, opc, datalo, datahi,
addrlo, TCG_REG_GUEST_BASE, false);
} else {
tcg_out_qemu_ld_direct(s, opc, datalo, datahi, addrlo);
}
@ -1719,7 +1723,8 @@ static void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, bool is64)
static void tcg_out_qemu_st_index(TCGContext *s, ARMCond cond, MemOp opc,
TCGReg datalo, TCGReg datahi,
TCGReg addrlo, TCGReg addend)
TCGReg addrlo, TCGReg addend,
bool scratch_addend)
{
/* Byte swapping is left to middle-end expansion. */
tcg_debug_assert((opc & MO_BSWAP) == 0);
@ -1739,9 +1744,14 @@ static void tcg_out_qemu_st_index(TCGContext *s, ARMCond cond, MemOp opc,
if (get_alignment_bits(opc) >= MO_64
&& (datalo & 1) == 0 && datahi == datalo + 1) {
tcg_out_strd_r(s, cond, datalo, addrlo, addend);
} else {
} else if (scratch_addend) {
tcg_out_st32_rwb(s, cond, datalo, addend, addrlo);
tcg_out_st32_12(s, cond, datahi, addend, 4);
} else {
tcg_out_dat_reg(s, cond, ARITH_ADD, TCG_REG_TMP,
addend, addrlo, SHIFT_IMM_LSL(0));
tcg_out_st32_12(s, cond, datalo, TCG_REG_TMP, 0);
tcg_out_st32_12(s, cond, datahi, TCG_REG_TMP, 4);
}
break;
default:
@ -1804,7 +1814,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is64)
mem_index = get_mmuidx(oi);
addend = tcg_out_tlb_read(s, addrlo, addrhi, opc, mem_index, 0);
tcg_out_qemu_st_index(s, COND_EQ, opc, datalo, datahi, addrlo, addend);
tcg_out_qemu_st_index(s, COND_EQ, opc, datalo, datahi,
addrlo, addend, true);
/* The conditional call must come last, as we're going to return here. */
label_ptr = s->code_ptr;
@ -1814,9 +1825,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args, bool is64)
s->code_ptr, label_ptr);
#else /* !CONFIG_SOFTMMU */
if (guest_base) {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP, guest_base);
tcg_out_qemu_st_index(s, COND_AL, opc, datalo,
datahi, addrlo, TCG_REG_TMP);
tcg_out_qemu_st_index(s, COND_AL, opc, datalo, datahi,
addrlo, TCG_REG_GUEST_BASE, false);
} else {
tcg_out_qemu_st_direct(s, opc, datalo, datahi, addrlo);
}
@ -2958,6 +2968,13 @@ static void tcg_target_qemu_prologue(TCGContext *s)
tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]);
#ifndef CONFIG_SOFTMMU
if (guest_base) {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_GUEST_BASE, guest_base);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_GUEST_BASE);
}
#endif
tcg_out_b_reg(s, COND_AL, tcg_target_call_iarg_regs[1]);
/*