[Bug target/82725] [8 Regression] [x86_64] internal compiler error: in change_address_1, at emit-rtl.c:2162

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82725

--- Comment #6 from Uroš Bizjak <ubizjak at gmail dot com> ---
I'm testing following patch:

--cut here--
Index: i386.c
===================================================================
--- i386.c      (revision 254199)
+++ i386.c      (working copy)
@@ -15079,10 +15079,16 @@ legitimate_pic_address_disp_p (rtx disp)
            break;
          op0 = XEXP (XEXP (disp, 0), 0);
          op1 = XEXP (XEXP (disp, 0), 1);
-         if (!CONST_INT_P (op1)
-             || INTVAL (op1) >= 16*1024*1024
+         if (!CONST_INT_P (op1))
+           break;
+         if (GET_CODE (op0) == UNSPEC
+             && (XINT (op0, 1) == UNSPEC_DTPOFF
+                 || XINT (op0, 1) == UNSPEC_NTPOFF)
+             && trunc_int_for_mode (INTVAL (op1), SImode) == INTVAL (op1))
+           return true;
+         if (INTVAL (op1) >= 16*1024*1024
              || INTVAL (op1) < -16*1024*1024)
-            break;
+           break;
          if (GET_CODE (op0) == LABEL_REF)
            return true;
          if (GET_CODE (op0) == CONST
--cut here--

As suggested, the patch allows offsetted UNSPEC_DTPOFF/UNSPEC_NTPOFF
relocations in legitimate_pic_address_disp_p. In fact, these are already
allowed in x86_64_immediate_operand, with the immediate limited to SImode
values.