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Diffstat (limited to 'target-i386/translate.c')
-rw-r--r--target-i386/translate.c237
1 files changed, 121 insertions, 116 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c
index 74694d180b..6b109e853b 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -1698,167 +1698,172 @@ static inline void tcg_gen_lshift(TCGv ret, TCGv arg1, target_long arg2)
tcg_gen_shri_tl(ret, arg1, -arg2);
}
-static void gen_rot_rm_T1(DisasContext *s, int ot, int op1,
- int is_right)
+static void gen_rot_rm_T1(DisasContext *s, int ot, int op1, int is_right)
{
- target_ulong mask;
- int label1, label2, data_bits;
- TCGv t0, t1, t2, a0;
-
- /* XXX: inefficient, but we must use local temps */
- t0 = tcg_temp_local_new();
- t1 = tcg_temp_local_new();
- t2 = tcg_temp_local_new();
- a0 = tcg_temp_local_new();
-
- if (ot == OT_QUAD)
- mask = 0x3f;
- else
- mask = 0x1f;
+ target_ulong mask = (ot == OT_QUAD ? 0x3f : 0x1f);
+ TCGv_i32 t0, t1;
/* load */
if (op1 == OR_TMP0) {
- tcg_gen_mov_tl(a0, cpu_A0);
- gen_op_ld_v(ot + s->mem_index, t0, a0);
+ gen_op_ld_T0_A0(ot + s->mem_index);
} else {
- gen_op_mov_v_reg(ot, t0, op1);
+ gen_op_mov_TN_reg(ot, 0, op1);
}
- tcg_gen_mov_tl(t1, cpu_T[1]);
-
- tcg_gen_andi_tl(t1, t1, mask);
-
- /* Must test zero case to avoid using undefined behaviour in TCG
- shifts. */
- label1 = gen_new_label();
- tcg_gen_brcondi_tl(TCG_COND_EQ, t1, 0, label1);
-
- if (ot <= OT_WORD)
- tcg_gen_andi_tl(cpu_tmp0, t1, (1 << (3 + ot)) - 1);
- else
- tcg_gen_mov_tl(cpu_tmp0, t1);
-
- gen_extu(ot, t0);
- tcg_gen_mov_tl(t2, t0);
+ tcg_gen_andi_tl(cpu_T[1], cpu_T[1], mask);
- data_bits = 8 << ot;
- /* XXX: rely on behaviour of shifts when operand 2 overflows (XXX:
- fix TCG definition) */
- if (is_right) {
- tcg_gen_shr_tl(cpu_tmp4, t0, cpu_tmp0);
- tcg_gen_subfi_tl(cpu_tmp0, data_bits, cpu_tmp0);
- tcg_gen_shl_tl(t0, t0, cpu_tmp0);
- } else {
- tcg_gen_shl_tl(cpu_tmp4, t0, cpu_tmp0);
- tcg_gen_subfi_tl(cpu_tmp0, data_bits, cpu_tmp0);
- tcg_gen_shr_tl(t0, t0, cpu_tmp0);
+ switch (ot) {
+ case OT_BYTE:
+ /* Replicate the 8-bit input so that a 32-bit rotate works. */
+ tcg_gen_ext8u_tl(cpu_T[0], cpu_T[0]);
+ tcg_gen_muli_tl(cpu_T[0], cpu_T[0], 0x01010101);
+ goto do_long;
+ case OT_WORD:
+ /* Replicate the 16-bit input so that a 32-bit rotate works. */
+ tcg_gen_deposit_tl(cpu_T[0], cpu_T[0], cpu_T[0], 16, 16);
+ goto do_long;
+ do_long:
+#ifdef TARGET_X86_64
+ case OT_LONG:
+ tcg_gen_trunc_tl_i32(cpu_tmp2_i32, cpu_T[0]);
+ tcg_gen_trunc_tl_i32(cpu_tmp3_i32, cpu_T[1]);
+ if (is_right) {
+ tcg_gen_rotr_i32(cpu_tmp2_i32, cpu_tmp2_i32, cpu_tmp3_i32);
+ } else {
+ tcg_gen_rotl_i32(cpu_tmp2_i32, cpu_tmp2_i32, cpu_tmp3_i32);
+ }
+ tcg_gen_extu_i32_tl(cpu_T[0], cpu_tmp2_i32);
+ break;
+#endif
+ default:
+ if (is_right) {
+ tcg_gen_rotr_tl(cpu_T[0], cpu_T[0], cpu_T[1]);
+ } else {
+ tcg_gen_rotl_tl(cpu_T[0], cpu_T[0], cpu_T[1]);
+ }
+ break;
}
- tcg_gen_or_tl(t0, t0, cpu_tmp4);
- gen_set_label(label1);
/* store */
if (op1 == OR_TMP0) {
- gen_op_st_v(ot + s->mem_index, t0, a0);
+ gen_op_st_T0_A0(ot + s->mem_index);
} else {
- gen_op_mov_reg_v(ot, op1, t0);
+ gen_op_mov_reg_T0(ot, op1);
}
-
- /* update eflags. It is needed anyway most of the time, do it always. */
- gen_compute_eflags(s);
- assert(s->cc_op == CC_OP_EFLAGS);
- label2 = gen_new_label();
- tcg_gen_brcondi_tl(TCG_COND_EQ, t1, 0, label2);
+ /* We'll need the flags computed into CC_SRC. */
+ gen_compute_eflags(s);
- tcg_gen_andi_tl(cpu_cc_src, cpu_cc_src, ~(CC_O | CC_C));
- tcg_gen_xor_tl(cpu_tmp0, t2, t0);
- tcg_gen_lshift(cpu_tmp0, cpu_tmp0, 11 - (data_bits - 1));
- tcg_gen_andi_tl(cpu_tmp0, cpu_tmp0, CC_O);
- tcg_gen_or_tl(cpu_cc_src, cpu_cc_src, cpu_tmp0);
+ /* The value that was "rotated out" is now present at the other end
+ of the word. Compute C into CC_DST and O into CC_SRC2. Note that
+ since we've computed the flags into CC_SRC, these variables are
+ currently dead. */
if (is_right) {
- tcg_gen_shri_tl(t0, t0, data_bits - 1);
+ tcg_gen_shri_tl(cpu_cc_src2, cpu_T[0], mask - 1);
+ tcg_gen_shri_tl(cpu_cc_dst, cpu_T[0], mask);
+ } else {
+ tcg_gen_shri_tl(cpu_cc_src2, cpu_T[0], mask);
+ tcg_gen_andi_tl(cpu_cc_dst, cpu_T[0], 1);
}
- tcg_gen_andi_tl(t0, t0, CC_C);
- tcg_gen_or_tl(cpu_cc_src, cpu_cc_src, t0);
-
- gen_set_label(label2);
-
- tcg_temp_free(t0);
- tcg_temp_free(t1);
- tcg_temp_free(t2);
- tcg_temp_free(a0);
+ tcg_gen_andi_tl(cpu_cc_src2, cpu_cc_src2, 1);
+ tcg_gen_xor_tl(cpu_cc_src2, cpu_cc_src2, cpu_cc_dst);
+
+ /* Now conditionally store the new CC_OP value. If the shift count
+ is 0 we keep the CC_OP_EFLAGS setting so that only CC_SRC is live.
+ Otherwise reuse CC_OP_ADCOX which have the C and O flags split out
+ exactly as we computed above. */
+ t0 = tcg_const_i32(0);
+ t1 = tcg_temp_new_i32();
+ tcg_gen_trunc_tl_i32(t1, cpu_T[1]);
+ tcg_gen_movi_i32(cpu_tmp2_i32, CC_OP_ADCOX);
+ tcg_gen_movi_i32(cpu_tmp3_i32, CC_OP_EFLAGS);
+ tcg_gen_movcond_i32(TCG_COND_NE, cpu_cc_op, t1, t0,
+ cpu_tmp2_i32, cpu_tmp3_i32);
+ tcg_temp_free_i32(t0);
+ tcg_temp_free_i32(t1);
+
+ /* The CC_OP value is no longer predictable. */
+ set_cc_op(s, CC_OP_DYNAMIC);
}
static void gen_rot_rm_im(DisasContext *s, int ot, int op1, int op2,
int is_right)
{
- int mask;
- int data_bits;
- TCGv t0, t1, a0;
-
- /* XXX: inefficient, but we must use local temps */
- t0 = tcg_temp_local_new();
- t1 = tcg_temp_local_new();
- a0 = tcg_temp_local_new();
-
- if (ot == OT_QUAD)
- mask = 0x3f;
- else
- mask = 0x1f;
+ int mask = (ot == OT_QUAD ? 0x3f : 0x1f);
+ int shift;
/* load */
if (op1 == OR_TMP0) {
- tcg_gen_mov_tl(a0, cpu_A0);
- gen_op_ld_v(ot + s->mem_index, t0, a0);
+ gen_op_ld_T0_A0(ot + s->mem_index);
} else {
- gen_op_mov_v_reg(ot, t0, op1);
+ gen_op_mov_TN_reg(ot, 0, op1);
}
- gen_extu(ot, t0);
- tcg_gen_mov_tl(t1, t0);
-
op2 &= mask;
- data_bits = 8 << ot;
if (op2 != 0) {
- int shift = op2 & ((1 << (3 + ot)) - 1);
- if (is_right) {
- tcg_gen_shri_tl(cpu_tmp4, t0, shift);
- tcg_gen_shli_tl(t0, t0, data_bits - shift);
- }
- else {
- tcg_gen_shli_tl(cpu_tmp4, t0, shift);
- tcg_gen_shri_tl(t0, t0, data_bits - shift);
+ switch (ot) {
+#ifdef TARGET_X86_64
+ case OT_LONG:
+ tcg_gen_trunc_tl_i32(cpu_tmp2_i32, cpu_T[0]);
+ if (is_right) {
+ tcg_gen_rotri_i32(cpu_tmp2_i32, cpu_tmp2_i32, op2);
+ } else {
+ tcg_gen_rotli_i32(cpu_tmp2_i32, cpu_tmp2_i32, op2);
+ }
+ tcg_gen_extu_i32_tl(cpu_T[0], cpu_tmp2_i32);
+ break;
+#endif
+ default:
+ if (is_right) {
+ tcg_gen_rotri_tl(cpu_T[0], cpu_T[0], op2);
+ } else {
+ tcg_gen_rotli_tl(cpu_T[0], cpu_T[0], op2);
+ }
+ break;
+ case OT_BYTE:
+ mask = 7;
+ goto do_shifts;
+ case OT_WORD:
+ mask = 15;
+ do_shifts:
+ shift = op2 & mask;
+ if (is_right) {
+ shift = mask + 1 - shift;
+ }
+ gen_extu(ot, cpu_T[0]);
+ tcg_gen_shli_tl(cpu_tmp0, cpu_T[0], shift);
+ tcg_gen_shri_tl(cpu_T[0], cpu_T[0], mask + 1 - shift);
+ tcg_gen_or_tl(cpu_T[0], cpu_T[0], cpu_tmp0);
+ break;
}
- tcg_gen_or_tl(t0, t0, cpu_tmp4);
}
/* store */
if (op1 == OR_TMP0) {
- gen_op_st_v(ot + s->mem_index, t0, a0);
+ gen_op_st_T0_A0(ot + s->mem_index);
} else {
- gen_op_mov_reg_v(ot, op1, t0);
+ gen_op_mov_reg_T0(ot, op1);
}
if (op2 != 0) {
- /* update eflags */
+ /* Compute the flags into CC_SRC. */
gen_compute_eflags(s);
- assert(s->cc_op == CC_OP_EFLAGS);
- tcg_gen_andi_tl(cpu_cc_src, cpu_cc_src, ~(CC_O | CC_C));
- tcg_gen_xor_tl(cpu_tmp0, t1, t0);
- tcg_gen_lshift(cpu_tmp0, cpu_tmp0, 11 - (data_bits - 1));
- tcg_gen_andi_tl(cpu_tmp0, cpu_tmp0, CC_O);
- tcg_gen_or_tl(cpu_cc_src, cpu_cc_src, cpu_tmp0);
+ /* The value that was "rotated out" is now present at the other end
+ of the word. Compute C into CC_DST and O into CC_SRC2. Note that
+ since we've computed the flags into CC_SRC, these variables are
+ currently dead. */
if (is_right) {
- tcg_gen_shri_tl(t0, t0, data_bits - 1);
+ tcg_gen_shri_tl(cpu_cc_src2, cpu_T[0], mask - 1);
+ tcg_gen_shri_tl(cpu_cc_dst, cpu_T[0], mask);
+ } else {
+ tcg_gen_shri_tl(cpu_cc_src2, cpu_T[0], mask);
+ tcg_gen_andi_tl(cpu_cc_dst, cpu_T[0], 1);
}
- tcg_gen_andi_tl(t0, t0, CC_C);
- tcg_gen_or_tl(cpu_cc_src, cpu_cc_src, t0);
+ tcg_gen_andi_tl(cpu_cc_src2, cpu_cc_src2, 1);
+ tcg_gen_xor_tl(cpu_cc_src2, cpu_cc_src2, cpu_cc_dst);
+ set_cc_op(s, CC_OP_ADCOX);
}
-
- tcg_temp_free(t0);
- tcg_temp_free(t1);
- tcg_temp_free(a0);
}
/* XXX: add faster immediate = 1 case */
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-20 10:13:04 +0000