rs6000: Delete HAVE_AS_DCI

diff --git a/gcc/config.in b/gcc/config.in
index 1242326..4db8aa1 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -309,12 +309,6 @@ 
 #endif
 
 
-/* Define if your assembler supports the DCI/ICI instructions. */
-#ifndef USED_FOR_TARGET
-#undef HAVE_AS_DCI
-#endif
-
-
 /* Define if your assembler supports the --debug-prefix-map option. */
 #ifndef USED_FOR_TARGET
 #undef HAVE_AS_DEBUG_PREFIX_MAP
diff --git a/gcc/config/powerpcspe/powerpcspe.h b/gcc/config/powerpcspe/powerpcspe.h
index 2bb32c7..df0676a 100644
--- a/gcc/config/powerpcspe/powerpcspe.h
+++ b/gcc/config/powerpcspe/powerpcspe.h
@@ -77,11 +77,7 @@ 
 #define ASM_CPU_POWER8_SPEC "-mpower8"
 #define ASM_CPU_POWER9_SPEC "-mpower9"
 
-#ifdef HAVE_AS_DCI
 #define ASM_CPU_476_SPEC "-m476"
-#else
-#define ASM_CPU_476_SPEC "-mpower4"
-#endif
 
 /* Common ASM definitions used by ASM_SPEC among the various targets for
    handling -mcpu=xxx switches.  There is a parallel list in driver-powerpcspe.c to
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h
index d2fe795..855de7c 100644
--- a/gcc/config/rs6000/rs6000.h
+++ b/gcc/config/rs6000/rs6000.h
@@ -78,11 +78,7 @@ 
 #define ASM_CPU_POWER8_SPEC "-mpower8"
 #define ASM_CPU_POWER9_SPEC "-mpower9"
 
-#ifdef HAVE_AS_DCI
 #define ASM_CPU_476_SPEC "-m476"
-#else
-#define ASM_CPU_476_SPEC "-mpower4"
-#endif
 
 /* Common ASM definitions used by ASM_SPEC among the various targets for
    handling -mcpu=xxx switches.  There is a parallel list in driver-rs6000.c to
diff --git a/gcc/configure b/gcc/configure
index 5d2fd18..9fb0eb57 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -26722,51 +26722,6 @@  $as_echo "#define HAVE_AS_VSX 1" >>confdefs.h
 fi
 
 
-    case $target in
-      *-*-aix*) conftest_s='	.machine "476"
-	.csect .text[PR]
-	dci 0';;
-      *) conftest_s='	.machine "476"
-	.text
-	dci 0';;
-    esac
-
-    { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for data cache invalidate support" >&5
-$as_echo_n "checking assembler for data cache invalidate support... " >&6; }
-if test "${gcc_cv_as_powerpc_dci+set}" = set; then :
-  $as_echo_n "(cached) " >&6
-else
-  gcc_cv_as_powerpc_dci=no
-    if test $in_tree_gas = yes; then
-    if test $gcc_cv_gas_vers -ge `expr \( \( 9 \* 1000 \) + 99 \) \* 1000 + 0`
-  then gcc_cv_as_powerpc_dci=yes
-fi
-  elif test x$gcc_cv_as != x; then
-    $as_echo "$conftest_s" > conftest.s
-    if { ac_try='$gcc_cv_as $gcc_cv_as_flags -a32 -o conftest.o conftest.s >&5'
-  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
-  (eval $ac_try) 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; }
-    then
-	gcc_cv_as_powerpc_dci=yes
-    else
-      echo "configure: failed program was" >&5
-      cat conftest.s >&5
-    fi
-    rm -f conftest.o conftest.s
-  fi
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_powerpc_dci" >&5
-$as_echo "$gcc_cv_as_powerpc_dci" >&6; }
-if test $gcc_cv_as_powerpc_dci = yes; then
-
-$as_echo "#define HAVE_AS_DCI 1" >>confdefs.h
-
-fi
-
-
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for .gnu_attribute support" >&5
 $as_echo_n "checking assembler for .gnu_attribute support... " >&6; }
 if test "${gcc_cv_as_powerpc_gnu_attribute+set}" = set; then :
diff --git a/gcc/configure.ac b/gcc/configure.ac
index 3c1e0ad..ca51cdf 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -4557,21 +4557,6 @@  LCF0:
       [AC_DEFINE(HAVE_AS_VSX, 1,
 	  [Define if your assembler supports VSX instructions.])])
 
-    case $target in
-      *-*-aix*) conftest_s='	.machine "476"
-	.csect .text[[PR]]
-	dci 0';;
-      *) conftest_s='	.machine "476"
-	.text
-	dci 0';;
-    esac
-
-    gcc_GAS_CHECK_FEATURE([data cache invalidate support],
-      gcc_cv_as_powerpc_dci, [9,99,0], -a32,
-      [$conftest_s],,
-      [AC_DEFINE(HAVE_AS_DCI, 1,
-	  [Define if your assembler supports the DCI/ICI instructions.])])
-
     gcc_GAS_CHECK_FEATURE([.gnu_attribute support],
       gcc_cv_as_powerpc_gnu_attribute, [2,18,0],,
       [.gnu_attribute 4,1],,