tcg/tci: Clean up deposit operations

Use the correct set of asserts during code generation.
We do not require the first input to overlap the output;
the existing interpreter already supported that.

Split out tci_args_rrrbb in the translator.
Use the deposit32/64 functions rather than inline expansion.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

tcg/tci.c

@@ -168,6 +168,7 @@ static tcg_target_ulong tci_read_label(const uint8_t **tb_ptr)
  *   tci_args_<arguments>
  * where arguments is a sequence of
  *
+ *   b = immediate (bit position)
  *   c = condition (TCGCond)
  *   i = immediate (uint32_t)
  *   I = immediate (tcg_target_ulong)
@@ -238,6 +239,16 @@ static void tci_args_rrrc(const uint8_t **tb_ptr,
     *c3 = tci_read_b(tb_ptr);
 }
 
+static void tci_args_rrrbb(const uint8_t **tb_ptr, TCGReg *r0, TCGReg *r1,
+                           TCGReg *r2, uint8_t *i3, uint8_t *i4)
+{
+    *r0 = tci_read_r(tb_ptr);
+    *r1 = tci_read_r(tb_ptr);
+    *r2 = tci_read_r(tb_ptr);
+    *i3 = tci_read_b(tb_ptr);
+    *i4 = tci_read_b(tb_ptr);
+}
+
 #if TCG_TARGET_REG_BITS == 32
 static void tci_args_rrrr(const uint8_t **tb_ptr,
                           TCGReg *r0, TCGReg *r1, TCGReg *r2, TCGReg *r3)
@@ -434,11 +445,9 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
         TCGReg r0, r1, r2;
         tcg_target_ulong t0;
         tcg_target_ulong t1;
-        tcg_target_ulong t2;
         TCGCond condition;
         target_ulong taddr;
-        uint8_t tmp8;
-        uint16_t tmp16;
+        uint8_t pos, len;
         uint32_t tmp32;
         uint64_t tmp64;
 #if TCG_TARGET_REG_BITS == 32
@@ -629,13 +638,8 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
 #endif
 #if TCG_TARGET_HAS_deposit_i32
         case INDEX_op_deposit_i32:
-            t0 = *tb_ptr++;
-            t1 = tci_read_rval(regs, &tb_ptr);
-            t2 = tci_read_rval(regs, &tb_ptr);
-            tmp16 = *tb_ptr++;
-            tmp8 = *tb_ptr++;
-            tmp32 = (((1 << tmp8) - 1) << tmp16);
-            tci_write_reg(regs, t0, (t1 & ~tmp32) | ((t2 << tmp16) & tmp32));
+            tci_args_rrrbb(&tb_ptr, &r0, &r1, &r2, &pos, &len);
+            regs[r0] = deposit32(regs[r1], pos, len, regs[r2]);
             break;
 #endif
         case INDEX_op_brcond_i32:
@@ -791,13 +795,8 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
 #endif
 #if TCG_TARGET_HAS_deposit_i64
         case INDEX_op_deposit_i64:
-            t0 = *tb_ptr++;
-            t1 = tci_read_rval(regs, &tb_ptr);
-            t2 = tci_read_rval(regs, &tb_ptr);
-            tmp16 = *tb_ptr++;
-            tmp8 = *tb_ptr++;
-            tmp64 = (((1ULL << tmp8) - 1) << tmp16);
-            tci_write_reg(regs, t0, (t1 & ~tmp64) | ((t2 << tmp16) & tmp64));
+            tci_args_rrrbb(&tb_ptr, &r0, &r1, &r2, &pos, &len);
+            regs[r0] = deposit64(regs[r1], pos, len, regs[r2]);
             break;
 #endif
         case INDEX_op_brcond_i64:

tcg/tci/tcg-target-con-set.h

@@ -13,7 +13,6 @@ C_O0_I2(r, r)
 C_O0_I3(r, r, r)
 C_O0_I4(r, r, r, r)
 C_O1_I1(r, r)
-C_O1_I2(r, 0, r)
 C_O1_I2(r, r, r)
 C_O1_I4(r, r, r, r, r)
 C_O2_I1(r, r, r)

tcg/tci/tcg-target.c.inc

@@ -126,11 +126,9 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
     case INDEX_op_rotr_i64:
     case INDEX_op_setcond_i32:
     case INDEX_op_setcond_i64:
-        return C_O1_I2(r, r, r);
-
     case INDEX_op_deposit_i32:
     case INDEX_op_deposit_i64:
-        return C_O1_I2(r, 0, r);
+        return C_O1_I2(r, r, r);
 
     case INDEX_op_brcond_i32:
     case INDEX_op_brcond_i64:
@@ -480,13 +478,19 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
         break;
 
     CASE_32_64(deposit)  /* Optional (TCG_TARGET_HAS_deposit_*). */
-        tcg_out_r(s, args[0]);
-        tcg_out_r(s, args[1]);
-        tcg_out_r(s, args[2]);
-        tcg_debug_assert(args[3] <= UINT8_MAX);
-        tcg_out8(s, args[3]);
-        tcg_debug_assert(args[4] <= UINT8_MAX);
-        tcg_out8(s, args[4]);
+        {
+            TCGArg pos = args[3], len = args[4];
+            TCGArg max = opc == INDEX_op_deposit_i32 ? 32 : 64;
+
+            tcg_debug_assert(pos < max);
+            tcg_debug_assert(pos + len <= max);
+
+            tcg_out_r(s, args[0]);
+            tcg_out_r(s, args[1]);
+            tcg_out_r(s, args[2]);
+            tcg_out8(s, pos);
+            tcg_out8(s, len);
+        }
         break;
 
     CASE_32_64(brcond)