diff --git a/.gitignore b/.gitignore
index 7cbbc04..afd3a9c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -40,3 +40,4 @@
 /gcc-8.0.1-20180220.tar.xz
 /gcc-8.0.1-20180222.tar.xz
 /gcc-8.0.1-20180310.tar.xz
+/gcc-8.0.1-20180312.tar.xz
diff --git a/gcc.spec b/gcc.spec
index 9d78e24..f3c3709 100644
--- a/gcc.spec
+++ b/gcc.spec
@@ -1,17 +1,17 @@
-%global DATE 20180310
-%global SVNREV 258420
+%global DATE 20180312
+%global SVNREV 258461
 %global gcc_version 8.0.1
 %global gcc_major 8
 # Note, gcc_release must be integer, if you want to add suffixes to
 # %%{release}, append them after %%{gcc_release} on Release: line.
-%global gcc_release 0.17
+%global gcc_release 0.18
 %global nvptx_tools_gitrev c28050f60193b3b95a18866a96f03334e874e78f
 %global nvptx_newlib_gitrev aadc8eb0ec43b7cd0dd2dfb484bae63c8b05ef24
 %global _unpackaged_files_terminate_build 0
 %global _performance_build 1
 # Hardening slows the compiler way too much.
 %undefine _hardened_build
-%if 0%{?fedora} > 27
+%if 0%{?fedora} > 27 || 0%{?rhel} >= 8
 # Until annobin is fixed (#1519165).
 %undefine _annotated_build
 %endif
@@ -131,7 +131,7 @@ URL: http://gcc.gnu.org
 # Need binutils which support --no-add-needed >= 2.20.51.0.2-12
 # Need binutils which support -plugin
 # Need binutils which support .loc view >= 2.30
-%if %{?fedora} >= 29
+%if %{?fedora} >= 29 || 0%{?rhel} >= 8
 BuildRequires: binutils >= 2.30
 %else
 BuildRequires: binutils >= 2.24
@@ -200,7 +200,7 @@ Requires: cpp = %{version}-%{release}
 # Need binutils that support --no-add-needed
 # Need binutils that support -plugin
 # Need binutils that support .loc view >= 2.30
-%if %{?fedora} >= 29
+%if %{?fedora} >= 29 || 0%{?rhel} >= 8
 Requires: binutils >= 2.30
 %else
 Requires: binutils >= 2.24
@@ -1886,7 +1886,7 @@ cd obj-%{gcc_target_platform}
 
 # run the tests.
 make %{?_smp_mflags} -k check ALT_CC_UNDER_TEST=gcc ALT_CXX_UNDER_TEST=g++ \
-%if 0%{?fedora} >= 20
+%if 0%{?fedora} >= 20 || 0%{?rhel} >= 8
      RUNTESTFLAGS="--target_board=unix/'{,-fstack-protector-strong}'" || :
 %else
      RUNTESTFLAGS="--target_board=unix/'{,-fstack-protector}'" || :
@@ -3064,7 +3064,14 @@ fi
 %endif
 
 %changelog
+* Mon Mar 12 2018 Jakub Jelinek <jakub@redhat.com> 8.0.1-0.18
+- update from the trunk
+  - PRs c++/84355, c++/84802, c++/84813, debug/58150, fortran/83939,
+	fortran/84546, rtl-optimization/84780, tree-optimization/83456,
+	tree-optimization/84777, tree-optimization/84803
 - add pconfigintrin.h and wbnoinvdintrin.h headers (#1554279)
+- fix -march=knl from emitting AVX512VL instructions (PR target/84786)
+- fix C++ constexpr RANGE_EXPR splitting (PR c++/84808)
 
 * Sat Mar 10 2018 Jakub Jelinek <jakub@redhat.com> 8.0.1-0.17
 - update from the trunk
diff --git a/gcc8-pr84786.patch b/gcc8-pr84786.patch
new file mode 100644
index 0000000..739f8c3
--- /dev/null
+++ b/gcc8-pr84786.patch
@@ -0,0 +1,76 @@
+2018-03-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/84786
+	* config/i386/sse.md (sse2_loadhpd): Use Yv constraint rather than v
+	on the last operand.
+
+	* gcc.target/i386/avx512f-pr84786-1.c: New test.
+	* gcc.target/i386/avx512f-pr84786-2.c: New test.
+
+--- gcc/config/i386/sse.md.jj	2018-03-05 17:00:24.568655800 +0100
++++ gcc/config/i386/sse.md	2018-03-12 11:05:48.917401886 +0100
+@@ -9022,14 +9022,14 @@ (define_expand "sse2_loadhpd_exp"
+ ;; see comment above inline_secondary_memory_needed function in i386.c
+ (define_insn "sse2_loadhpd"
+   [(set (match_operand:V2DF 0 "nonimmediate_operand"
+-	  "=x,v,x,v,o,o ,o")
++	  "=x,v,x,v ,o,o ,o")
+ 	(vec_concat:V2DF
+ 	  (vec_select:DF
+ 	    (match_operand:V2DF 1 "nonimmediate_operand"
+-	  " 0,v,0,v,0,0 ,0")
++	  " 0,v,0,v ,0,0 ,0")
+ 	    (parallel [(const_int 0)]))
+ 	  (match_operand:DF 2 "nonimmediate_operand"
+-	  " m,m,x,v,x,*f,r")))]
++	  " m,m,x,Yv,x,*f,r")))]
+   "TARGET_SSE2 && !(MEM_P (operands[1]) && MEM_P (operands[2]))"
+   "@
+    movhpd\t{%2, %0|%0, %2}
+--- gcc/testsuite/gcc.target/i386/avx512f-pr84786-1.c.jj	2018-03-12 11:32:33.563665173 +0100
++++ gcc/testsuite/gcc.target/i386/avx512f-pr84786-1.c	2018-03-12 11:35:33.964695384 +0100
+@@ -0,0 +1,25 @@
++/* PR target/84786 */
++/* { dg-do run { target { ! ia32 } } } */
++/* { dg-options "-mavx512f -mno-avx512vl -O2" } */
++/* { dg-require-effective-target avx512f } */
++
++#include "avx512f-check.h"
++
++typedef double V __attribute__((vector_size (16)));
++
++__attribute__((noipa)) V
++foo (V x, double y)
++{
++  register double z __asm ("xmm18");
++  asm volatile ("" : "=v" (z) : "0" (y));
++  x[1] = z;
++  return x;
++}
++
++static void
++avx512f_test (void)
++{
++  V a = foo ((V) { 1.0, 2.0 }, 3.0);
++  if (a[0] != 1.0 || a[1] != 3.0)
++    abort ();
++}
+--- gcc/testsuite/gcc.target/i386/avx512f-pr84786-2.c.jj	2018-03-12 11:32:43.445666826 +0100
++++ gcc/testsuite/gcc.target/i386/avx512f-pr84786-2.c	2018-03-12 11:35:45.260697279 +0100
+@@ -0,0 +1,16 @@
++/* PR target/84786 */
++/* { dg-do compile { target { ! ia32 } } } */
++/* { dg-options "-mavx512f -mno-avx512vl -O2" } */
++
++typedef double V __attribute__((vector_size (16)));
++
++__attribute__((noipa)) V
++foo (V x, double y)
++{
++  register double z __asm ("xmm18");
++  asm volatile ("" : "=v" (z) : "0" (y));
++  x[1] = z;
++  return x;
++}
++
++/* { dg-final { scan-assembler-not "vunpcklpd\[\^\n\r]*xmm(1\[6-9]|\[23]\[0-9])" } } */
diff --git a/gcc8-pr84808.patch b/gcc8-pr84808.patch
new file mode 100644
index 0000000..8689258
--- /dev/null
+++ b/gcc8-pr84808.patch
@@ -0,0 +1,82 @@
+2018-03-12  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/84808
+	* constexpr.c (find_array_ctor_elt): Don't use elt reference after
+	first potential CONSTRUCTOR_ELTS reallocation.  Convert dindex to
+	sizetype.  Formatting fixes.
+
+	* g++.dg/cpp1y/constexpr-84808.C: New test.
+
+--- gcc/cp/constexpr.c.jj	2018-03-07 22:52:02.000000000 +0100
++++ gcc/cp/constexpr.c	2018-03-12 12:39:46.890321137 +0100
+@@ -2194,9 +2194,9 @@ find_array_ctor_elt (tree ary, tree dind
+      that the same is true of the other elements and index directly.  */
+   if (end > 0)
+     {
+-      tree cindex = (*elts)[end-1].index;
++      tree cindex = (*elts)[end - 1].index;
+       if (TREE_CODE (cindex) == INTEGER_CST
+-	  && compare_tree_int (cindex, end-1) == 0)
++	  && compare_tree_int (cindex, end - 1) == 0)
+ 	{
+ 	  if (i < end)
+ 	    return i;
+@@ -2225,6 +2225,8 @@ find_array_ctor_elt (tree ary, tree dind
+ 	      constructor_elt e;
+ 	      tree lo = TREE_OPERAND (idx, 0);
+ 	      tree hi = TREE_OPERAND (idx, 1);
++	      tree value = elt.value;
++	      dindex = fold_convert (sizetype, dindex);
+ 	      if (tree_int_cst_lt (lo, dindex))
+ 		{
+ 		  /* There are still some lower elts; shorten the range.  */
+@@ -2238,7 +2240,7 @@ find_array_ctor_elt (tree ary, tree dind
+ 		  /* Append the element we want to insert.  */
+ 		  ++middle;
+ 		  e.index = dindex;
+-		  e.value = unshare_constructor (elt.value);
++		  e.value = unshare_constructor (value);
+ 		  vec_safe_insert (CONSTRUCTOR_ELTS (ary), middle, e);
+ 		}
+ 	      else
+@@ -2254,8 +2256,8 @@ find_array_ctor_elt (tree ary, tree dind
+ 		    e.index = hi;
+ 		  else
+ 		    e.index = build2 (RANGE_EXPR, sizetype, new_lo, hi);
+-		  e.value = unshare_constructor (elt.value);
+-		  vec_safe_insert (CONSTRUCTOR_ELTS (ary), middle+1, e);
++		  e.value = unshare_constructor (value);
++		  vec_safe_insert (CONSTRUCTOR_ELTS (ary), middle + 1, e);
+ 		}
+ 	    }
+ 	  return middle;
+--- gcc/testsuite/g++.dg/cpp1y/constexpr-84808.C.jj	2018-03-12 12:45:29.472374837 +0100
++++ gcc/testsuite/g++.dg/cpp1y/constexpr-84808.C	2018-03-12 12:46:11.742381465 +0100
+@@ -0,0 +1,27 @@
++// PR c++/84808
++// { dg-do compile { target c++14 } }
++
++struct A { int i; constexpr A () : i() {} };
++struct B { A a[24]; };
++
++constexpr int
++foo (int n)
++{
++  B b;
++  ++b.a[n + 20].i;
++  ++b.a[n + 18].i;
++  ++b.a[n + 16].i;
++  ++b.a[n + 14].i;
++  ++b.a[n + 12].i;
++  ++b.a[n + 10].i;
++  ++b.a[n + 8].i;
++  ++b.a[n + 6].i;
++  ++b.a[n + 4].i;
++  ++b.a[n + 2].i;
++  ++b.a[n].i;
++  return b.a[2].i + b.a[4].i + b.a[6].i + b.a[8].i + b.a[10].i
++	 + b.a[12].i + b.a[14].i + b.a[16].i + b.a[18].i + b.a[20].i + b.a[22].i;
++}
++
++constexpr int i = foo (2);
++static_assert (i == 11, "");
diff --git a/sources b/sources
index f89331e..1b4019f 100644
--- a/sources
+++ b/sources
@@ -1,3 +1,3 @@
-SHA512 (gcc-8.0.1-20180310.tar.xz) = 9dff425cd8463676b0e9ed6a7d9e7cd967c2e26d17cb195261cd900bff4d307f38e8f4ded1696deffd69ffa687108e1db0bcfaaa3cb3f4fd9917cc17608dcb47
+SHA512 (gcc-8.0.1-20180312.tar.xz) = 4d88974201d1894fa66c39aabd27f0657ce4d451c35df8ace7500c2ad1109da3147e770cb23e4121035ea6ec742a96bc4d6374836ddccac34cc1330fbc7b9345
 SHA512 (nvptx-newlib-aadc8eb0ec43b7cd0dd2dfb484bae63c8b05ef24.tar.xz) = 94f7089365296f7dfa485107b4143bebc850a81586f3460fd896bbbb6ba099a00217d4042133424fd2183b352132f4fd367e6a60599bdae2a26dfd48a77d0e04
 SHA512 (nvptx-tools-c28050f60193b3b95a18866a96f03334e874e78f.tar.xz) = a688cb12cf805950a5abbb13b52f45c81dbee98e310b7ed57ae20e76dbfa5964a16270148374a6426d177db71909d28360490f091c86a5d19d4faa5127beeee1