diff --git a/dwz.patch b/dwz.patch
new file mode 100644
index 0000000..1bc9cef
--- /dev/null
+++ b/dwz.patch
@@ -0,0 +1,87 @@
+diff --git a/dwz.c b/dwz.c
+index 308bcba..a6ea5ec 100644
+--- a/dwz.c
++++ b/dwz.c
+@@ -3580,7 +3580,14 @@ checksum_die (DSO *dso, dw_cu_ref cu, dw_die_ref top_die, dw_die_ref die)
+ 	  ptr += ptr_size;
+ 	  break;
+ 	case DW_FORM_flag_present:
++	  break;
+ 	case DW_FORM_implicit_const:
++	  if (!handled && die->die_ck_state != CK_BAD)
++	    {
++	      handled = true;
++	      die->u.p1.die_hash
++		= iterative_hash_object (t->values[i], die->u.p1.die_hash);
++	    }
+ 	  break;
+ 	case DW_FORM_flag:
+ 	case DW_FORM_data1:
+@@ -4837,7 +4844,11 @@ die_eq_1 (dw_cu_ref cu1, dw_cu_ref cu2,
+ 	  ptr2 += ptr_size;
+ 	  break;
+ 	case DW_FORM_flag_present:
++	  break;
+ 	case DW_FORM_implicit_const:
++	  if ((!ignore_locus || old_ptr1)
++	      && t1->values[i] != t2->values[j])
++	    FAIL;
+ 	  break;
+ 	case DW_FORM_flag:
+ 	case DW_FORM_data1:
+@@ -10456,19 +10467,18 @@ build_abbrevs_for_die (htab_t h, dw_cu_ref cu, dw_die_ref die,
+ 		    case DW_FORM_data4: value = read_32 (ptr); break;
+ 		    case DW_FORM_data8: value = read_64 (ptr); break;
+ 		    case DW_FORM_udata: value = read_uleb128 (ptr); break;
+-		    case DW_FORM_implicit_const: break;
++		    case DW_FORM_implicit_const:
++		      value = reft->values[i];
++		      break;
+ 		    default:
+ 		      error (0, 0, "Unhandled %s for %s",
+ 			     get_DW_FORM_str (form),
+ 			     get_DW_AT_str (reft->attr[i].attr));
+ 		      return 1;
+ 		    }
+-		  /* Note that the value is only used for calculating the
+-		     DIE size and possibly change form. Doesn't change the
+-		     implicit_const from or value.  */
++		  value = line_htab_lookup (refcu, value);
+ 		  if (form != DW_FORM_implicit_const)
+ 		    {
+-		      value = line_htab_lookup (refcu, value);
+ 		      if (value <= 0xff)
+ 			{
+ 			  form = DW_FORM_data1;
+@@ -10488,7 +10498,7 @@ build_abbrevs_for_die (htab_t h, dw_cu_ref cu, dw_die_ref die,
+ 		  t->attr[j].attr = reft->attr[i].attr;
+ 		  t->attr[j].form = form;
+ 		  if (form == DW_FORM_implicit_const)
+-		    t->values[j] = reft->values[i];
++		    t->values[j] = value;
+ 		  j++;
+ 		  continue;
+ 		}
+@@ -12088,10 +12098,8 @@ write_die (unsigned char *ptr, dw_cu_ref cu, dw_die_ref die,
+ 		  update = true;
+ 		  break;
+ 		case DW_FORM_implicit_const:
+-		  /* Negative means, already transformed.  */
+-		  if (reft->values[i] >= 0)
+-		    update = true;
+-		  value = reft->values[i];
++		  /* DW_FORM_implicit_const should have been updated
++		     already when computing abbrevs.  */
+ 		  break;
+ 		default: abort ();
+ 		}
+@@ -12104,9 +12112,6 @@ write_die (unsigned char *ptr, dw_cu_ref cu, dw_die_ref die,
+ 		    case DW_FORM_data2: write_16 (ptr, value); break;
+ 		    case DW_FORM_data4: write_32 (ptr, value); break;
+ 		    case DW_FORM_udata: write_uleb128 (ptr, value); break;
+-		    case DW_FORM_implicit_const:
+-		      reft->values[i] = -value; /* Note, negated.  */
+-		      break;
+ 		    default: abort ();
+ 		    }
+ 		}
diff --git a/dwz.spec b/dwz.spec
index 6491899..94b5512 100644
--- a/dwz.spec
+++ b/dwz.spec
@@ -1,11 +1,12 @@
 Summary: DWARF optimization and duplicate removal tool
 Name: dwz
 Version: 0.13
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: GPLv2+ and GPLv3+
 #Source: https://sourceware.org/ftp/dwz/releases/%{name}-%{version}.tar.xz
 #git clone git://sourceware.org/git/dwz; cd dwz; git archive --format=tar --prefix=dwz/ 40d5efd4edc52a7d2ed02f8400a9beb129053271 | xz -9e > ../dwz-20210118.tar.xz
 Source: %{name}-20210118.tar.xz
+Patch: %{name}.patch
 BuildRequires: gcc, gcc-c++, gdb, elfutils-libelf-devel, dejagnu
 BuildRequires: make
 
@@ -20,6 +21,7 @@ and using DW_TAG_imported_unit to import it into each CU that needs it.
 
 %prep
 %setup -q -n dwz
+%patch -p1
 
 %build
 %make_build CFLAGS='%{optflags}' LDFLAGS='%{build_ldflags}' \
@@ -38,6 +40,9 @@ make check
 %{_mandir}/man1/dwz.1*
 
 %changelog
+* Wed Jan 20 2021 Jakub Jelinek <jakub@redhat.com> 0.13-6
+- DW_FORM_implicit_const handling fixes (sw#27212, sw#27213)
+
 * Mon Jan 18 2021 Jakub Jelinek <jakub@redhat.com> 0.13-5
 - update to latest git snapshot
   - DWARF5 support