[Qemu-devel] [PATCH v3 46/69] target/arm: Convert T16 data-processing (two low regs)

[Richard Henderson <richard.henderson@linaro.org>]

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/translate.c | 152 ++---------------------------------------
 target/arm/t16.decode  |  36 ++++++++++
 2 files changed, 43 insertions(+), 145 deletions(-)

diff --git a/target/arm/translate.c b/target/arm/translate.c
index 106ef08ada..6e841c346f 100644
--- a/target/arm/translate.c
+++ b/target/arm/translate.c
@@ -445,13 +445,6 @@ static inline void gen_logic_CC(TCGv_i32 var)
     tcg_gen_mov_i32(cpu_ZF, var);
 }
 
-/* T0 += T1 + CF.  */
-static void gen_adc(TCGv_i32 t0, TCGv_i32 t1)
-{
-    tcg_gen_add_i32(t0, t0, t1);
-    tcg_gen_add_i32(t0, t0, cpu_CF);
-}
-
 /* dest = T0 + T1 + CF. */
 static void gen_add_carry(TCGv_i32 dest, TCGv_i32 t0, TCGv_i32 t1)
 {
@@ -7527,6 +7520,11 @@ static int t32_branch24(DisasContext *s, int x)
     return x << 1;
 }
 
+static int t16_setflags(DisasContext *s)
+{
+    return s->condexec_mask == 0;
+}
+
 /*
  * Include the generated decoders.
  */
@@ -10838,145 +10836,9 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
 
         /*
          * 0b0100_00xx_xxxx_xxxx
-         *  - Data-processing (two low registers)
+         *  - Data-processing (two low registers), in decodetree
          */
-        rd = insn & 7;
-        rm = (insn >> 3) & 7;
-        op = (insn >> 6) & 0xf;
-        if (op == 2 || op == 3 || op == 4 || op == 7) {
-            /* the shift/rotate ops want the operands backwards */
-            val = rm;
-            rm = rd;
-            rd = val;
-            val = 1;
-        } else {
-            val = 0;
-        }
-
-        if (op == 9) { /* neg */
-            tmp = tcg_temp_new_i32();
-            tcg_gen_movi_i32(tmp, 0);
-        } else if (op != 0xf) { /* mvn doesn't read its first operand */
-            tmp = load_reg(s, rd);
-        } else {
-            tmp = NULL;
-        }
-
-        tmp2 = load_reg(s, rm);
-        switch (op) {
-        case 0x0: /* and */
-            tcg_gen_and_i32(tmp, tmp, tmp2);
-            if (!s->condexec_mask)
-                gen_logic_CC(tmp);
-            break;
-        case 0x1: /* eor */
-            tcg_gen_xor_i32(tmp, tmp, tmp2);
-            if (!s->condexec_mask)
-                gen_logic_CC(tmp);
-            break;
-        case 0x2: /* lsl */
-            if (s->condexec_mask) {
-                gen_shl(tmp2, tmp2, tmp);
-            } else {
-                gen_helper_shl_cc(tmp2, cpu_env, tmp2, tmp);
-                gen_logic_CC(tmp2);
-            }
-            break;
-        case 0x3: /* lsr */
-            if (s->condexec_mask) {
-                gen_shr(tmp2, tmp2, tmp);
-            } else {
-                gen_helper_shr_cc(tmp2, cpu_env, tmp2, tmp);
-                gen_logic_CC(tmp2);
-            }
-            break;
-        case 0x4: /* asr */
-            if (s->condexec_mask) {
-                gen_sar(tmp2, tmp2, tmp);
-            } else {
-                gen_helper_sar_cc(tmp2, cpu_env, tmp2, tmp);
-                gen_logic_CC(tmp2);
-            }
-            break;
-        case 0x5: /* adc */
-            if (s->condexec_mask) {
-                gen_adc(tmp, tmp2);
-            } else {
-                gen_adc_CC(tmp, tmp, tmp2);
-            }
-            break;
-        case 0x6: /* sbc */
-            if (s->condexec_mask) {
-                gen_sub_carry(tmp, tmp, tmp2);
-            } else {
-                gen_sbc_CC(tmp, tmp, tmp2);
-            }
-            break;
-        case 0x7: /* ror */
-            if (s->condexec_mask) {
-                tcg_gen_andi_i32(tmp, tmp, 0x1f);
-                tcg_gen_rotr_i32(tmp2, tmp2, tmp);
-            } else {
-                gen_helper_ror_cc(tmp2, cpu_env, tmp2, tmp);
-                gen_logic_CC(tmp2);
-            }
-            break;
-        case 0x8: /* tst */
-            tcg_gen_and_i32(tmp, tmp, tmp2);
-            gen_logic_CC(tmp);
-            rd = 16;
-            break;
-        case 0x9: /* neg */
-            if (s->condexec_mask)
-                tcg_gen_neg_i32(tmp, tmp2);
-            else
-                gen_sub_CC(tmp, tmp, tmp2);
-            break;
-        case 0xa: /* cmp */
-            gen_sub_CC(tmp, tmp, tmp2);
-            rd = 16;
-            break;
-        case 0xb: /* cmn */
-            gen_add_CC(tmp, tmp, tmp2);
-            rd = 16;
-            break;
-        case 0xc: /* orr */
-            tcg_gen_or_i32(tmp, tmp, tmp2);
-            if (!s->condexec_mask)
-                gen_logic_CC(tmp);
-            break;
-        case 0xd: /* mul */
-            tcg_gen_mul_i32(tmp, tmp, tmp2);
-            if (!s->condexec_mask)
-                gen_logic_CC(tmp);
-            break;
-        case 0xe: /* bic */
-            tcg_gen_andc_i32(tmp, tmp, tmp2);
-            if (!s->condexec_mask)
-                gen_logic_CC(tmp);
-            break;
-        case 0xf: /* mvn */
-            tcg_gen_not_i32(tmp2, tmp2);
-            if (!s->condexec_mask)
-                gen_logic_CC(tmp2);
-            val = 1;
-            rm = rd;
-            break;
-        }
-        if (rd != 16) {
-            if (val) {
-                store_reg(s, rm, tmp2);
-                if (op != 0xf)
-                    tcg_temp_free_i32(tmp);
-            } else {
-                store_reg(s, rd, tmp);
-                tcg_temp_free_i32(tmp2);
-            }
-        } else {
-            tcg_temp_free_i32(tmp);
-            tcg_temp_free_i32(tmp2);
-        }
-        break;
+        goto illegal_op;
 
     case 5:
         /* load/store register offset.  */
diff --git a/target/arm/t16.decode b/target/arm/t16.decode
index e954f61fe4..44e7250c55 100644
--- a/target/arm/t16.decode
+++ b/target/arm/t16.decode
@@ -18,3 +18,39 @@
 #
 # This file is processed by scripts/decodetree.py
 #
+
+&s_rrr_shi       !extern s rd rn rm shim shty
+&s_rrr_shr       !extern s rn rd rm rs shty
+&s_rri_rot       !extern s rn rd imm rot
+&s_rrrr          !extern s rd rn rm ra
+
+# Set S if the instruction is outside of an IT block.
+%s               !function=t16_setflags
+
+# Data-processing (two low registers)
+
+%reg_0           0:3
+
+@lll_noshr       ...... .... rm:3 rd:3 \
+                 &s_rrr_shi %s rn=%reg_0 shim=0 shty=0
+@xll_noshr       ...... .... rm:3 rn:3 \
+                 &s_rrr_shi s=1 rd=0 shim=0 shty=0
+@lxl_shr         ...... .... rs:3 rd:3 \
+                 &s_rrr_shr %s rm=%reg_0 rn=0
+
+AND_rrri         010000 0000 ... ...            @lll_noshr
+EOR_rrri         010000 0001 ... ...            @lll_noshr
+MOV_rxrr         010000 0010 ... ...            @lxl_shr shty=0  # LSL
+MOV_rxrr         010000 0011 ... ...            @lxl_shr shty=1  # LSR
+MOV_rxrr         010000 0100 ... ...            @lxl_shr shty=2  # ASR
+ADC_rrri         010000 0101 ... ...            @lll_noshr
+SBC_rrri         010000 0110 ... ...            @lll_noshr
+MOV_rxrr         010000 0111 ... ...            @lxl_shr shty=3  # ROR
+TST_xrri         010000 1000 ... ...            @xll_noshr
+RSB_rri          010000 1001 rn:3 rd:3          &s_rri_rot %s imm=0 rot=0
+CMP_xrri         010000 1010 ... ...            @xll_noshr
+CMN_xrri         010000 1011 ... ...            @xll_noshr
+ORR_rrri         010000 1100 ... ...            @lll_noshr
+MUL              010000 1101 rn:3 rd:3          &s_rrrr %s rm=%reg_0 ra=0
+BIC_rrri         010000 1110 ... ...            @lll_noshr
+MVN_rxri         010000 1111 ... ...            @lll_noshr
-- 
2.17.1