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tcg-aarch64: Handle constant operands to add, sub, and compare 

Signed-off-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
Tested-by: Claudio Fontana <claudio.fontana@huawei.com>
This commit is contained in:
Richard Henderson 2013-08-14 09:56:14 -07:00
parent 7d11fc7c2b
commit 90f1cd9138
1 changed files with 78 additions and 22 deletions
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100
tcg/aarch64/tcg-target.c
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@ -110,6 +110,9 @@ static inline void patch_reloc(uint8_t *code_ptr, int type,
}
}
#define TCG_CT_CONST_IS32 0x100
#define TCG_CT_CONST_AIMM 0x200
/* parse target specific constraints */
static int target_parse_constraint(TCGArgConstraint *ct,
const char **pct_str)
@ -133,6 +136,12 @@ static int target_parse_constraint(TCGArgConstraint *ct,
tcg_regset_reset_reg(ct->u.regs, TCG_REG_X3);
#endif
break;
case 'w': /* The operand should be considered 32-bit. */
ct->ct |= TCG_CT_CONST_IS32;
break;
case 'A': /* Valid for arithmetic immediate (positive or negative). */
ct->ct |= TCG_CT_CONST_AIMM;
break;
default:
return -1;
}
@ -142,14 +151,25 @@ static int target_parse_constraint(TCGArgConstraint *ct,
return 0;
}
static inline int tcg_target_const_match(tcg_target_long val,
const TCGArgConstraint *arg_ct)
static inline bool is_aimm(uint64_t val)
{
return (val & ~0xfff) == 0 || (val & ~0xfff000) == 0;
}
static int tcg_target_const_match(tcg_target_long val,
const TCGArgConstraint *arg_ct)
{
int ct = arg_ct->ct;
if (ct & TCG_CT_CONST) {
return 1;
}
if (ct & TCG_CT_CONST_IS32) {
val = (int32_t)val;
}
if ((ct & TCG_CT_CONST_AIMM) && (is_aimm(val) || is_aimm(-val))) {
return 1;
}
return 0;
}
@ -553,10 +573,20 @@ static inline void tcg_out_rotl(TCGContext *s, TCGType ext,
tcg_out_extr(s, ext, rd, rn, rn, bits - (m & max));
}
static void tcg_out_cmp(TCGContext *s, TCGType ext, TCGReg rn, TCGReg rm)
static void tcg_out_cmp(TCGContext *s, TCGType ext, TCGReg a,
tcg_target_long b, bool const_b)
{
/* Using CMP alias SUBS wzr, Wn, Wm */
tcg_out_insn(s, 3502, SUBS, ext, TCG_REG_XZR, rn, rm);
if (const_b) {
/* Using CMP or CMN aliases. */
if (b >= 0) {
tcg_out_insn(s, 3401, SUBSI, ext, TCG_REG_XZR, a, b);
} else {
tcg_out_insn(s, 3401, ADDSI, ext, TCG_REG_XZR, a, -b);
}
} else {
/* Using CMP alias SUBS wzr, Wn, Wm */
tcg_out_insn(s, 3502, SUBS, ext, TCG_REG_XZR, a, b);
}
}
static inline void tcg_out_cset(TCGContext *s, TCGType ext,
@ -748,6 +778,16 @@ static inline void tcg_out_uxt(TCGContext *s, int s_bits,
tcg_out_ubfm(s, 0, rd, rn, 0, bits);
}
static void tcg_out_addsubi(TCGContext *s, int ext, TCGReg rd,
TCGReg rn, int64_t aimm)
{
if (aimm >= 0) {
tcg_out_insn(s, 3401, ADDI, ext, rd, rn, aimm);
} else {
tcg_out_insn(s, 3401, SUBI, ext, rd, rn, -aimm);
}
}
#ifdef CONFIG_SOFTMMU
/* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
* int mmu_idx, uintptr_t ra)
@ -863,7 +903,7 @@ static void tcg_out_tlb_read(TCGContext *s, TCGReg addr_reg,
(is_read ? offsetof(CPUTLBEntry, addr_read)
: offsetof(CPUTLBEntry, addr_write)));
/* Perform the address comparison. */
tcg_out_cmp(s, (TARGET_LONG_BITS == 64), TCG_REG_X0, TCG_REG_X3);
tcg_out_cmp(s, (TARGET_LONG_BITS == 64), TCG_REG_X0, TCG_REG_X3, 0);
*label_ptr = s->code_ptr;
/* If not equal, we jump to the slow path. */
tcg_out_goto_cond_noaddr(s, TCG_COND_NE);
@ -1124,14 +1164,26 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
a0, a1, a2);
break;
case INDEX_op_add_i64:
case INDEX_op_add_i32:
tcg_out_insn(s, 3502, ADD, ext, a0, a1, a2);
a2 = (int32_t)a2;
/* FALLTHRU */
case INDEX_op_add_i64:
if (c2) {
tcg_out_addsubi(s, ext, a0, a1, a2);
} else {
tcg_out_insn(s, 3502, ADD, ext, a0, a1, a2);
}
break;
case INDEX_op_sub_i64:
case INDEX_op_sub_i32:
tcg_out_insn(s, 3502, SUB, ext, a0, a1, a2);
a2 = (int32_t)a2;
/* FALLTHRU */
case INDEX_op_sub_i64:
if (c2) {
tcg_out_addsubi(s, ext, a0, a1, -a2);
} else {
tcg_out_insn(s, 3502, SUB, ext, a0, a1, a2);
}
break;
case INDEX_op_and_i64:
@ -1200,15 +1252,19 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
}
break;
case INDEX_op_brcond_i64:
case INDEX_op_brcond_i32:
tcg_out_cmp(s, ext, a0, a1);
a1 = (int32_t)a1;
/* FALLTHRU */
case INDEX_op_brcond_i64:
tcg_out_cmp(s, ext, a0, a1, const_args[1]);
tcg_out_goto_label_cond(s, a2, args[3]);
break;
case INDEX_op_setcond_i64:
case INDEX_op_setcond_i32:
tcg_out_cmp(s, ext, a1, a2);
a2 = (int32_t)a2;
/* FALLTHRU */
case INDEX_op_setcond_i64:
tcg_out_cmp(s, ext, a1, a2, c2);
tcg_out_cset(s, 0, a0, args[3]);
break;
@ -1329,10 +1385,10 @@ static const TCGTargetOpDef aarch64_op_defs[] = {
{ INDEX_op_st32_i64, { "r", "r" } },
{ INDEX_op_st_i64, { "r", "r" } },
{ INDEX_op_add_i32, { "r", "r", "r" } },
{ INDEX_op_add_i64, { "r", "r", "r" } },
{ INDEX_op_sub_i32, { "r", "r", "r" } },
{ INDEX_op_sub_i64, { "r", "r", "r" } },
{ INDEX_op_add_i32, { "r", "r", "rwA" } },
{ INDEX_op_add_i64, { "r", "r", "rA" } },
{ INDEX_op_sub_i32, { "r", "r", "rwA" } },
{ INDEX_op_sub_i64, { "r", "r", "rA" } },
{ INDEX_op_mul_i32, { "r", "r", "r" } },
{ INDEX_op_mul_i64, { "r", "r", "r" } },
{ INDEX_op_and_i32, { "r", "r", "r" } },
@ -1353,10 +1409,10 @@ static const TCGTargetOpDef aarch64_op_defs[] = {
{ INDEX_op_rotl_i64, { "r", "r", "ri" } },
{ INDEX_op_rotr_i64, { "r", "r", "ri" } },
{ INDEX_op_brcond_i32, { "r", "r" } },
{ INDEX_op_setcond_i32, { "r", "r", "r" } },
{ INDEX_op_brcond_i64, { "r", "r" } },
{ INDEX_op_setcond_i64, { "r", "r", "r" } },
{ INDEX_op_brcond_i32, { "r", "rwA" } },
{ INDEX_op_brcond_i64, { "r", "rA" } },
{ INDEX_op_setcond_i32, { "r", "r", "rwA" } },
{ INDEX_op_setcond_i64, { "r", "r", "rA" } },
{ INDEX_op_qemu_ld8u, { "r", "l" } },
{ INDEX_op_qemu_ld8s, { "r", "l" } },