[PATCH] RISC-V: Support (set (mem) (const_poly_int))

[juzhe . zhong]

From: Ju-Zhe Zhong <juzhe.zh...@rivai.ai>

gcc/ChangeLog:

        * config/riscv/riscv.cc (riscv_legitimize_move): Support (set (mem) 
(const_poly_int)).

---
 gcc/config/riscv/riscv.cc | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 90a39047dd7..f7694ba043c 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -1958,6 +1958,20 @@ riscv_legitimize_move (machine_mode mode, rtx dest, rtx 
src)
 {
   if (CONST_POLY_INT_P (src))
     {
+      /*
+       Handle:
+         (insn 183 182 184 6 (set (mem:QI (plus:DI (reg/f:DI 156)
+                 (const_int 96 [0x60])) [0  S1 A8])
+         (const_poly_int:QI [8, 8]))
+       "../../../../riscv-gcc/libgcc/unwind-dw2.c":1579:3 -1 (nil))
+      */
+      if (MEM_P (dest))
+       {
+         rtx tmp = gen_reg_rtx (mode);
+         emit_move_insn (tmp, src);
+         emit_move_insn (dest, tmp);
+         return true;
+       }
       poly_int64 value = rtx_to_poly_int64 (src);
       if (!value.is_constant () && !TARGET_VECTOR)
        {
-- 
2.36.1