[PATCH] RISC-V: Support (set (mem) (const_poly_int)) handling and remove TI/TF.

[juzhe . zhong]

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

gcc/ChangeLog:

        * config/riscv/riscv-vector-switch.def (ENTRY): Remove TI/TF.
        * config/riscv/riscv.cc (riscv_legitimize_move): Support (set (mem) 
(const_poly_int)).

---
 gcc/config/riscv/riscv-vector-switch.def |  4 ----
 gcc/config/riscv/riscv.cc                | 14 ++++++++++++++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/gcc/config/riscv/riscv-vector-switch.def 
b/gcc/config/riscv/riscv-vector-switch.def
index cacfccb6d29..ee8ebd5f1cc 100644
--- a/gcc/config/riscv/riscv-vector-switch.def
+++ b/gcc/config/riscv/riscv-vector-switch.def
@@ -155,10 +155,6 @@ ENTRY (VNx4DF, TARGET_VECTOR_FP64)
 ENTRY (VNx2DF, TARGET_VECTOR_FP64)
 ENTRY (VNx1DF, TARGET_VECTOR_FP64)
 
-/* SEW = 128. Disable all of them.  */
-ENTRY (VNx2TI, false)
-ENTRY (VNx2TF, false)
-
 #undef TARGET_VECTOR_FP32
 #undef TARGET_VECTOR_FP64
 #undef ENTRY
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