tcg/riscv: Accept constant first argument to sub_vec
Use vrsub.vi to subtract from a constant.
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/tcg/riscv/tcg-target-con-set.h b/tcg/riscv/tcg-target-con-set.h
index 97e6ecd..d8ce541 100644
--- a/tcg/riscv/tcg-target-con-set.h
+++ b/tcg/riscv/tcg-target-con-set.h
@@ -25,6 +25,7 @@
C_O1_I1(v, r)
C_O1_I1(v, v)
C_O1_I2(v, v, v)
+C_O1_I2(v, vK, v)
C_O1_I2(v, v, vK)
C_O1_I2(v, v, vL)
C_O1_I4(v, v, vL, vK, vK)
diff --git a/tcg/riscv/tcg-target.c.inc b/tcg/riscv/tcg-target.c.inc
index ce8d6d0..1ce2f29 100644
--- a/tcg/riscv/tcg-target.c.inc
+++ b/tcg/riscv/tcg-target.c.inc
@@ -2350,7 +2350,11 @@
break;
case INDEX_op_sub_vec:
set_vtype_len_sew(s, type, vece);
- tcg_out_opc_vv(s, OPC_VSUB_VV, a0, a1, a2);
+ if (const_args[1]) {
+ tcg_out_opc_vi(s, OPC_VRSUB_VI, a0, a2, a1);
+ } else {
+ tcg_out_opc_vv(s, OPC_VSUB_VV, a0, a1, a2);
+ }
break;
case INDEX_op_and_vec:
set_vtype_len(s, type);
@@ -2565,7 +2569,7 @@
case INDEX_op_xor_vec:
return C_O1_I2(v, v, vK);
case INDEX_op_sub_vec:
- return C_O1_I2(v, v, v);
+ return C_O1_I2(v, vK, v);
case INDEX_op_cmp_vec:
return C_O1_I2(v, v, vL);
case INDEX_op_cmpsel_vec:
