diff --git a/toolchain/gcc/patches/4.7-linaro/400-fix-incorrect-optimization.patch b/toolchain/gcc/patches/4.7-linaro/400-fix-incorrect-optimization.patch
deleted file mode 100644
index 0b32d375b7..0000000000
--- a/toolchain/gcc/patches/4.7-linaro/400-fix-incorrect-optimization.patch
+++ /dev/null
@@ -1,247 +0,0 @@
---- /dev/null
-+++ b/make/target/gcc/4.7.0/920-tree-ssa-tail-merge.patch
-@@ -0,0 +1,244 @@
-+This patch refers to:
-+
-+http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52734
-+http://gcc.gnu.org/bugzilla/attachment.cgi?id=27014&action=diff&context=patch&collapsed=&headers=1&format=raw
-+
-+--- gcc/tree-ssa-tail-merge.c	
-++++ gcc/tree-ssa-tail-merge.c	
-+@@ -1033,7 +1033,7 @@ set_cluster (basic_block bb1, basic_bloc
-+    gimple_bb (s2) are members of SAME_SUCC.  */
-+ 
-+ static bool
-+-gimple_equal_p (same_succ same_succ, gimple s1, gimple s2)
-++gimple_equal_p (same_succ same_succ, gimple s1, gimple s2, bool *gvn_used)
-+ {
-+   unsigned int i;
-+   tree lhs1, lhs2;
-+@@ -1069,7 +1069,10 @@ gimple_equal_p (same_succ same_succ, gim
-+ 	  if (operand_equal_p (t1, t2, 0))
-+ 	    continue;
-+ 	  if (gvn_uses_equal (t1, t2))
-+-	    continue;
-++	    {
-++	      *gvn_used = true;
-++	      continue;
-++	    }
-+ 	  equal = false;
-+ 	  break;
-+ 	}
-+@@ -1083,12 +1086,16 @@ gimple_equal_p (same_succ same_succ, gim
-+       if (lhs1 == NULL_TREE || lhs2 == NULL_TREE)
-+ 	return false;
-+       if (TREE_CODE (lhs1) == SSA_NAME && TREE_CODE (lhs2) == SSA_NAME)
-+-	return vn_valueize (lhs1) == vn_valueize (lhs2);
-++	{
-++	  *gvn_used = true;
-++	  return vn_valueize (lhs1) == vn_valueize (lhs2);
-++	}
-+       return operand_equal_p (lhs1, lhs2, 0);
-+ 
-+     case GIMPLE_ASSIGN:
-+       lhs1 = gimple_get_lhs (s1);
-+       lhs2 = gimple_get_lhs (s2);
-++      *gvn_used = true;
-+       return (TREE_CODE (lhs1) == SSA_NAME
-+ 	      && TREE_CODE (lhs2) == SSA_NAME
-+ 	      && vn_valueize (lhs1) == vn_valueize (lhs2));
-+@@ -1096,15 +1103,23 @@ gimple_equal_p (same_succ same_succ, gim
-+     case GIMPLE_COND:
-+       t1 = gimple_cond_lhs (s1);
-+       t2 = gimple_cond_lhs (s2);
-+-      if (!operand_equal_p (t1, t2, 0)
-+-	  && !gvn_uses_equal (t1, t2))
-+-	return false;
-++      if (!operand_equal_p (t1, t2, 0))
-++	{
-++	  if (gvn_uses_equal (t1, t2))
-++	    *gvn_used = true;
-++	  else
-++	    return false;
-++	}
-+ 
-+       t1 = gimple_cond_rhs (s1);
-+       t2 = gimple_cond_rhs (s2);
-+-      if (!operand_equal_p (t1, t2, 0)
-+-	  && !gvn_uses_equal (t1, t2))
-+-	return false;
-++      if (!operand_equal_p (t1, t2, 0))
-++	{
-++	  if (gvn_uses_equal (t1, t2))
-++	    *gvn_used = true;
-++	  else
-++	    return false;
-++	}
-+ 
-+       code1 = gimple_expr_code (s1);
-+       code2 = gimple_expr_code (s2);
-+@@ -1126,18 +1141,25 @@ gimple_equal_p (same_succ same_succ, gim
-+ /* Let GSI skip backwards over local defs.  */
-+ 
-+ static void
-+-gsi_advance_bw_nondebug_nonlocal (gimple_stmt_iterator *gsi)
-++gsi_advance_bw_nondebug_nonlocal (gimple_stmt_iterator *gsi, tree *vuse)
-+ {
-+   gimple stmt;
-++  tree lvuse;
-+ 
-+   while (true)
-+     {
-+       if (gsi_end_p (*gsi))
-+ 	return;
-+       stmt = gsi_stmt (*gsi);
-++
-++      lvuse = gimple_vuse (stmt);
-++      if (lvuse != NULL_TREE)
-++	*vuse = lvuse;
-++
-+       if (!(is_gimple_assign (stmt) && local_def (gimple_get_lhs (stmt))
-+ 	    && !gimple_has_side_effects (stmt)))
-+ 	return;
-++
-+       gsi_prev_nondebug (gsi);
-+     }
-+ }
-+@@ -1146,28 +1168,34 @@ gsi_advance_bw_nondebug_nonlocal (gimple
-+    clusters them.  */
-+ 
-+ static void
-+-find_duplicate (same_succ same_succ, basic_block bb1, basic_block bb2)
-++find_duplicate (same_succ same_succ, basic_block bb1, basic_block bb2,
-++		bool gvn_used)
-+ {
-+   gimple_stmt_iterator gsi1 = gsi_last_nondebug_bb (bb1);
-+   gimple_stmt_iterator gsi2 = gsi_last_nondebug_bb (bb2);
-++  tree vuse1 = NULL_TREE, vuse2 = NULL_TREE;
-+ 
-+-  gsi_advance_bw_nondebug_nonlocal (&gsi1);
-+-  gsi_advance_bw_nondebug_nonlocal (&gsi2);
-++  gsi_advance_bw_nondebug_nonlocal (&gsi1, &vuse1);
-++  gsi_advance_bw_nondebug_nonlocal (&gsi2, &vuse2);
-+ 
-+   while (!gsi_end_p (gsi1) && !gsi_end_p (gsi2))
-+     {
-+-      if (!gimple_equal_p (same_succ, gsi_stmt (gsi1), gsi_stmt (gsi2)))
-++      if (!gimple_equal_p (same_succ, gsi_stmt (gsi1), gsi_stmt (gsi2),
-++			   &gvn_used))
-+ 	return;
-+ 
-+       gsi_prev_nondebug (&gsi1);
-+       gsi_prev_nondebug (&gsi2);
-+-      gsi_advance_bw_nondebug_nonlocal (&gsi1);
-+-      gsi_advance_bw_nondebug_nonlocal (&gsi2);
-++      gsi_advance_bw_nondebug_nonlocal (&gsi1, &vuse1);
-++      gsi_advance_bw_nondebug_nonlocal (&gsi2, &vuse2);
-+     }
-+ 
-+   if (!(gsi_end_p (gsi1) && gsi_end_p (gsi2)))
-+     return;
-+ 
-++  if (gvn_used && vuse1 != vuse2)
-++    return;
-++
-+   if (dump_file)
-+     fprintf (dump_file, "find_duplicates: <bb %d> duplicate of <bb %d>\n",
-+ 	     bb1->index, bb2->index);
-+@@ -1179,7 +1207,7 @@ find_duplicate (same_succ same_succ, bas
-+    E2 are equal.  */
-+ 
-+ static bool
-+-same_phi_alternatives_1 (basic_block dest, edge e1, edge e2)
-++same_phi_alternatives_1 (basic_block dest, edge e1, edge e2, bool *gvn_used)
-+ {
-+   int n1 = e1->dest_idx, n2 = e2->dest_idx;
-+   gimple_stmt_iterator gsi;
-+@@ -1197,7 +1225,10 @@ same_phi_alternatives_1 (basic_block des
-+       if (operand_equal_for_phi_arg_p (val1, val2))
-+         continue;
-+       if (gvn_uses_equal (val1, val2))
-+-	continue;
-++	{
-++	  *gvn_used = true;
-++	  continue;
-++	}
-+ 
-+       return false;
-+     }
-+@@ -1209,7 +1240,8 @@ same_phi_alternatives_1 (basic_block des
-+    phi alternatives for BB1 and BB2 are equal.  */
-+ 
-+ static bool
-+-same_phi_alternatives (same_succ same_succ, basic_block bb1, basic_block bb2)
-++same_phi_alternatives (same_succ same_succ, basic_block bb1, basic_block bb2,
-++		       bool *gvn_used)
-+ {
-+   unsigned int s;
-+   bitmap_iterator bs;
-+@@ -1227,7 +1259,7 @@ same_phi_alternatives (same_succ same_su
-+ 
-+       /* For all phis in bb, the phi alternatives for e1 and e2 need to have
-+ 	 the same value.  */
-+-      if (!same_phi_alternatives_1 (succ, e1, e2))
-++      if (!same_phi_alternatives_1 (succ, e1, e2, gvn_used))
-+ 	return false;
-+     }
-+ 
-+@@ -1301,6 +1333,7 @@ find_clusters_1 (same_succ same_succ)
-+   bitmap_iterator bi, bj;
-+   int nr_comparisons;
-+   int max_comparisons = PARAM_VALUE (PARAM_MAX_TAIL_MERGE_COMPARISONS);
-++  bool gvn_used;
-+ 
-+   EXECUTE_IF_SET_IN_BITMAP (same_succ->bbs, 0, i, bi)
-+     {
-+@@ -1333,10 +1366,11 @@ find_clusters_1 (same_succ same_succ)
-+ 	  if (!deps_ok_for_redirect (bb1, bb2))
-+ 	    continue;
-+ 
-+-	  if (!(same_phi_alternatives (same_succ, bb1, bb2)))
-++	  gvn_used = false;
-++	  if (!(same_phi_alternatives (same_succ, bb1, bb2, &gvn_used)))
-+ 	    continue;
-+ 
-+-	  find_duplicate (same_succ, bb1, bb2);
-++	  find_duplicate (same_succ, bb1, bb2, gvn_used);
-+         }
-+     }
-+ }
-+--- gcc/testsuite/gcc.dg/pr52734.c	
-++++ gcc/testsuite/gcc.dg/pr52734.c	
-+@@ -0,0 +1,35 @@ 
-++/* { dg-do run } */
-++/* { dg-options "-O2" } */
-++
-++int bbb = 0;
-++
-++int __attribute__((noinline,noclone)) aaa(void)
-++{
-++    ++bbb;
-++    return 0;
-++}
-++
-++int __attribute__((noinline,noclone)) ccc(void)
-++{
-++  int ddd;
-++  /* bbb == 0 */
-++  if (aaa())
-++    return bbb;
-++
-++  /* bbb == 1 */
-++  ddd = bbb;
-++  /* bbb == ddd == 1 */
-++  if (aaa ())
-++    return 0;
-++  /* bbb == 2, ddd == 1 */
-++
-++  return ddd;
-++}
-++
-++int main(void)
-++{
-++    if (ccc() != 1)
-++	__builtin_abort();
-++    return 0;
-++}
-++