[Hook] Add even-odd pair of register support in TARGET_HARD_REGNO_MOD…

…E_OK hook
riscvarchive · May 31, 2021 · 82035e7 · 82035e7
1 parent 1759d4c
commit 82035e7
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/gcc/config/riscv/riscv.c b/gcc/config/riscv/riscv.c
@@ -4516,6 +4516,14 @@ riscv_hard_regno_mode_ok (unsigned int regno, machine_mode mode)
 	!= call_used_or_fixed_reg_p (regno + i))
       return false;
 
+  /* use even/odd pair of registers in rv32 zpsf subset */
+  if (TARGET_ZPSF && !TARGET_64BIT)
+    {
+      if ((GET_MODE_CLASS (mode) == MODE_INT || 
+          GET_MODE_CLASS (mode) == MODE_VECTOR_INT) &&
+          GET_MODE_UNIT_SIZE (mode) == GET_MODE_SIZE (DImode))
+        return !(regno & 1);
+    }
   return true;
 }