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target-m68k: Inline addx, subx, negx 

Signed-off-by: Richard Henderson <rth@twiddle.net>

And add opcodes for 680x0

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2015-08-14 07:59:26 -07:00 committed by Laurent Vivier
parent beff27ab3a
commit a665a820e5
3 changed files with 180 additions and 62 deletions
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40
target-m68k/helper.c
View File

@ -277,46 +277,6 @@ uint32_t HELPER(sats)(uint32_t val, uint32_t v)
return val;
}
uint32_t HELPER(subx_cc)(CPUM68KState *env, uint32_t op1, uint32_t op2)
{
uint32_t res, new_x;
if (env->cc_x) {
new_x = (op1 <= op2);
res = op1 - (op2 + 1);
} else {
new_x = (op1 < op2);
res = op1 - op2;
}
env->cc_x = new_x;
env->cc_c = new_x;
env->cc_n = res;
env->cc_z |= res; /* !Z is sticky */
env->cc_v = (res ^ op1) & (op1 ^ op2);
return res;
}
uint32_t HELPER(addx_cc)(CPUM68KState *env, uint32_t op1, uint32_t op2)
{
uint32_t res, new_x;
if (env->cc_x) {
res = op1 + op2 + 1;
new_x = (res <= op2);
} else {
res = op1 + op2;
new_x = (res < op2);
}
env->cc_x = new_x;
env->cc_c = new_x;
env->cc_n = res;
env->cc_z |= res; /* !Z is sticky. */
env->cc_v = (res ^ op1) & ~(op1 ^ op2);
return res;
}
void HELPER(set_sr)(CPUM68KState *env, uint32_t val)
{
env->sr = val & 0xffe0;

2
target-m68k/helper.h
View File

@ -3,8 +3,6 @@ DEF_HELPER_1(ff1, i32, i32)
DEF_HELPER_FLAGS_2(sats, TCG_CALL_NO_RWG_SE, i32, i32, i32)
DEF_HELPER_2(divu, void, env, i32)
DEF_HELPER_2(divs, void, env, i32)
DEF_HELPER_3(addx_cc, i32, env, i32, i32)
DEF_HELPER_3(subx_cc, i32, env, i32, i32)
DEF_HELPER_3(shl_cc, i32, env, i32, i32)
DEF_HELPER_3(shr_cc, i32, env, i32, i32)
DEF_HELPER_3(sar_cc, i32, env, i32, i32)

200
target-m68k/translate.c
View File

@ -1536,11 +1536,44 @@ DISAS_INSN(move)
DISAS_INSN(negx)
{
TCGv reg;
TCGv z;
TCGv src;
TCGv addr;
int opsize;
gen_flush_flags(s);
reg = DREG(insn, 0);
gen_helper_subx_cc(reg, cpu_env, tcg_const_i32(0), reg);
opsize = insn_opsize(insn);
SRC_EA(env, src, opsize, 1, &addr);
gen_flush_flags(s); /* compute old Z */
/* Perform substract with borrow.
* (X, N) = -(src + X);
*/
z = tcg_const_i32(0);
tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, src, z, QREG_CC_X, z);
tcg_gen_sub2_i32(QREG_CC_N, QREG_CC_X, z, z, QREG_CC_N, QREG_CC_X);
tcg_temp_free(z);
gen_ext(QREG_CC_N, QREG_CC_N, opsize, 1);
tcg_gen_andi_i32(QREG_CC_X, QREG_CC_X, 1);
/* Compute signed-overflow for negation. The normal formula for
* subtraction is (res ^ src) & (src ^ dest), but with dest==0
* this simplies to res & src.
*/
tcg_gen_and_i32(QREG_CC_V, QREG_CC_N, src);
/* Copy the rest of the results into place. */
tcg_gen_or_i32(QREG_CC_Z, QREG_CC_Z, QREG_CC_N); /* !Z is sticky */
tcg_gen_mov_i32(QREG_CC_C, QREG_CC_X);
set_cc_op(s, CC_OP_FLAGS);
/* result is in QREG_CC_N */
DEST_EA(env, insn, opsize, QREG_CC_N, &addr);
}
DISAS_INSN(lea)
@ -1975,15 +2008,75 @@ DISAS_INSN(suba)
tcg_gen_sub_i32(reg, reg, src);
}
DISAS_INSN(subx)
static inline void gen_subx(DisasContext *s, TCGv src, TCGv dest, int opsize)
{
TCGv reg;
TCGv src;
TCGv tmp;
gen_flush_flags(s);
reg = DREG(insn, 9);
src = DREG(insn, 0);
gen_helper_subx_cc(reg, cpu_env, reg, src);
gen_flush_flags(s); /* compute old Z */
/* Perform substract with borrow.
* (X, N) = dest - (src + X);
*/
tmp = tcg_const_i32(0);
tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, src, tmp, QREG_CC_X, tmp);
tcg_gen_sub2_i32(QREG_CC_N, QREG_CC_X, dest, tmp, QREG_CC_N, QREG_CC_X);
gen_ext(QREG_CC_N, QREG_CC_N, opsize, 1);
tcg_gen_andi_i32(QREG_CC_X, QREG_CC_X, 1);
/* Compute signed-overflow for substract. */
tcg_gen_xor_i32(QREG_CC_V, QREG_CC_N, dest);
tcg_gen_xor_i32(tmp, dest, src);
tcg_gen_and_i32(QREG_CC_V, QREG_CC_V, tmp);
tcg_temp_free(tmp);
/* Copy the rest of the results into place. */
tcg_gen_or_i32(QREG_CC_Z, QREG_CC_Z, QREG_CC_N); /* !Z is sticky */
tcg_gen_mov_i32(QREG_CC_C, QREG_CC_X);
set_cc_op(s, CC_OP_FLAGS);
/* result is in QREG_CC_N */
}
DISAS_INSN(subx_reg)
{
TCGv dest;
TCGv src;
int opsize;
opsize = insn_opsize(insn);
src = gen_extend(DREG(insn, 0), opsize, 1);
dest = gen_extend(DREG(insn, 9), opsize, 1);
gen_subx(s, src, dest, opsize);
gen_partset_reg(opsize, DREG(insn, 9), QREG_CC_N);
}
DISAS_INSN(subx_mem)
{
TCGv src;
TCGv addr_src;
TCGv dest;
TCGv addr_dest;
int opsize;
opsize = insn_opsize(insn);
addr_src = AREG(insn, 0);
tcg_gen_subi_i32(addr_src, addr_src, opsize);
src = gen_load(s, opsize, addr_src, 1);
addr_dest = AREG(insn, 9);
tcg_gen_subi_i32(addr_dest, addr_dest, opsize);
dest = gen_load(s, opsize, addr_dest, 1);
gen_subx(s, src, dest, opsize);
gen_store(s, opsize, addr_dest, QREG_CC_N);
}
DISAS_INSN(mov3q)
@ -2102,15 +2195,74 @@ DISAS_INSN(adda)
tcg_gen_add_i32(reg, reg, src);
}
DISAS_INSN(addx)
static inline void gen_addx(DisasContext *s, TCGv src, TCGv dest, int opsize)
{
TCGv reg;
TCGv src;
TCGv tmp;
gen_flush_flags(s);
reg = DREG(insn, 9);
src = DREG(insn, 0);
gen_helper_addx_cc(reg, cpu_env, reg, src);
gen_flush_flags(s); /* compute old Z */
/* Perform addition with carry.
* (X, N) = src + dest + X;
*/
tmp = tcg_const_i32(0);
tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, QREG_CC_X, tmp, dest, tmp);
tcg_gen_add2_i32(QREG_CC_N, QREG_CC_X, QREG_CC_N, QREG_CC_X, src, tmp);
gen_ext(QREG_CC_N, QREG_CC_N, opsize, 1);
/* Compute signed-overflow for addition. */
tcg_gen_xor_i32(QREG_CC_V, QREG_CC_N, src);
tcg_gen_xor_i32(tmp, dest, src);
tcg_gen_andc_i32(QREG_CC_V, QREG_CC_V, tmp);
tcg_temp_free(tmp);
/* Copy the rest of the results into place. */
tcg_gen_or_i32(QREG_CC_Z, QREG_CC_Z, QREG_CC_N); /* !Z is sticky */
tcg_gen_mov_i32(QREG_CC_C, QREG_CC_X);
set_cc_op(s, CC_OP_FLAGS);
/* result is in QREG_CC_N */
}
DISAS_INSN(addx_reg)
{
TCGv dest;
TCGv src;
int opsize;
opsize = insn_opsize(insn);
dest = gen_extend(DREG(insn, 9), opsize, 1);
src = gen_extend(DREG(insn, 0), opsize, 1);
gen_addx(s, src, dest, opsize);
gen_partset_reg(opsize, DREG(insn, 9), QREG_CC_N);
}
DISAS_INSN(addx_mem)
{
TCGv src;
TCGv addr_src;
TCGv dest;
TCGv addr_dest;
int opsize;
opsize = insn_opsize(insn);
addr_src = AREG(insn, 0);
tcg_gen_subi_i32(addr_src, addr_src, opsize_bytes(opsize));
src = gen_load(s, opsize, addr_src, 1);
addr_dest = AREG(insn, 9);
tcg_gen_subi_i32(addr_dest, addr_dest, opsize_bytes(opsize));
dest = gen_load(s, opsize, addr_dest, 1);
gen_addx(s, src, dest, opsize);
gen_store(s, opsize, addr_dest, QREG_CC_N);
}
/* TODO: This could be implemented without helper functions. */
@ -3109,6 +3261,8 @@ void register_m68k_insns (CPUM68KState *env)
BASE(move, 3000, f000);
INSN(strldsr, 40e7, ffff, CF_ISA_APLUSC);
INSN(negx, 4080, fff8, CF_ISA_A);
INSN(negx, 4000, ff00, M68000);
INSN(undef, 40c0, ffc0, M68000);
INSN(move_from_sr, 40c0, fff8, CF_ISA_A);
INSN(move_from_sr, 40c0, ffc0, M68000);
BASE(lea, 41c0, f1c0);
@ -3179,7 +3333,10 @@ void register_m68k_insns (CPUM68KState *env)
BASE(or, 8000, f000);
BASE(divw, 80c0, f0c0);
BASE(addsub, 9000, f000);
INSN(subx, 9180, f1f8, CF_ISA_A);
INSN(undef, 90c0, f0c0, CF_ISA_A);
INSN(subx_reg, 9180, f1f8, CF_ISA_A);
INSN(subx_reg, 9100, f138, M68000);
INSN(subx_mem, 9108, f138, M68000);
INSN(suba, 91c0, f1c0, CF_ISA_A);
BASE(undef_mac, a000, f000);
@ -3211,7 +3368,10 @@ void register_m68k_insns (CPUM68KState *env)
INSN(exg_da, c188, f1f8, M68000);
BASE(mulw, c0c0, f0c0);
BASE(addsub, d000, f000);
INSN(addx, d180, f1f8, CF_ISA_A);
INSN(undef, d0c0, f0c0, CF_ISA_A);
INSN(addx_reg, d180, f1f8, CF_ISA_A);
INSN(addx_reg, d100, f138, M68000);
INSN(addx_mem, d108, f138, M68000);
INSN(adda, d1c0, f1c0, CF_ISA_A);
INSN(adda, d0c0, f0c0, M68000);
INSN(shift_im, e080, f0f0, CF_ISA_A);