tcg/riscv: Simplify constraints on qemu_ld/st

The softmmu tlb uses TCG_REG_TMP[0-2], not any of the normally available
registers.  Now that we handle overlap betwen inputs and helper arguments,
we can allow any allocatable reg.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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

@@ -10,10 +10,8 @@
  * tcg-target-con-str.h; the constraint combination is inclusive or.
  */
 C_O0_I1(r)
-C_O0_I2(LZ, L)
 C_O0_I2(rZ, r)
 C_O0_I2(rZ, rZ)
-C_O1_I1(r, L)
 C_O1_I1(r, r)
 C_O1_I2(r, r, ri)
 C_O1_I2(r, r, rI)

tcg/riscv/tcg-target-con-str.h

@@ -9,7 +9,6 @@
  * REGS(letter, register_mask)
  */
 REGS('r', ALL_GENERAL_REGS)
-REGS('L', ALL_GENERAL_REGS & ~SOFTMMU_RESERVE_REGS)
 
 /*
  * Define constraint letters for constants:

tcg/riscv/tcg-target.c.inc

@@ -125,17 +125,7 @@ static TCGReg tcg_target_call_oarg_reg(TCGCallReturnKind kind, int slot)
 #define TCG_CT_CONST_N12   0x400
 #define TCG_CT_CONST_M12   0x800
 
-#define ALL_GENERAL_REGS      MAKE_64BIT_MASK(0, 32)
-/*
- * For softmmu, we need to avoid conflicts with the first 5
- * argument registers to call the helper.  Some of these are
- * also used for the tlb lookup.
- */
-#ifdef CONFIG_SOFTMMU
-#define SOFTMMU_RESERVE_REGS  MAKE_64BIT_MASK(TCG_REG_A0, 5)
-#else
-#define SOFTMMU_RESERVE_REGS  0
-#endif
+#define ALL_GENERAL_REGS   MAKE_64BIT_MASK(0, 32)
 
 #define sextreg  sextract64
 
@@ -1600,10 +1590,10 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
 
     case INDEX_op_qemu_ld_i32:
     case INDEX_op_qemu_ld_i64:
-        return C_O1_I1(r, L);
+        return C_O1_I1(r, r);
     case INDEX_op_qemu_st_i32:
     case INDEX_op_qemu_st_i64:
-        return C_O0_I2(LZ, L);
+        return C_O0_I2(rZ, r);
 
     default:
         g_assert_not_reached();