poly_int: GET_MODE_SIZE

[thirdparty/gcc.git] / gcc / regcprop.c

diff --git a/gcc/regcprop.c b/gcc/regcprop.c
index a9fbcae6f00ddb951c80320a8e4b11aae282a8e0..e2a78a2b0e15f779599b33961c6867fdd39c1207 100644 (file)
--- a/gcc/regcprop.c
+++ b/gcc/regcprop.c
@@ -406,8 +406,11 @@ maybe_mode_change (machine_mode orig_mode, machine_mode copy_mode,
     {
       int copy_nregs = hard_regno_nregs (copy_regno, copy_mode);
       int use_nregs = hard_regno_nregs (copy_regno, new_mode);
-      int copy_offset
-       = GET_MODE_SIZE (copy_mode) / copy_nregs * (copy_nregs - use_nregs);
+      poly_uint64 bytes_per_reg;
+      if (!can_div_trunc_p (GET_MODE_SIZE (copy_mode),
+                           copy_nregs, &bytes_per_reg))
+       return NULL_RTX;
+      poly_uint64 copy_offset = bytes_per_reg * (copy_nregs - use_nregs);
       poly_uint64 offset
        = subreg_size_lowpart_offset (GET_MODE_SIZE (new_mode) + copy_offset,
                                      GET_MODE_SIZE (orig_mode));