diff --git a/gcc/ccmp.cc b/gcc/ccmp.cc
index 09d6b5595a4..7cb525addf4 100644
--- a/gcc/ccmp.cc
+++ b/gcc/ccmp.cc
@@ -90,9 +90,10 @@ ccmp_tree_comparison_p (tree t, basic_block bb)
    If all checks OK in expand_ccmp_expr, it emits insns in prep_seq, then
    insns in gen_seq.  */
 
-/* Check whether G is a potential conditional compare candidate.  */
+/* Check whether G is a potential conditional compare candidate; OUTER is true if
+   G is the outer most AND/IOR.  */
 static bool
-ccmp_candidate_p (gimple *g)
+ccmp_candidate_p (gimple *g, bool outer = false)
 {
   tree lhs, op0, op1;
   gimple *gs0, *gs1;
@@ -109,8 +110,9 @@ ccmp_candidate_p (gimple *g)
   lhs = gimple_assign_lhs (g);
   op0 = gimple_assign_rhs1 (g);
   op1 = gimple_assign_rhs2 (g);
-  if ((TREE_CODE (op0) != SSA_NAME) || (TREE_CODE (op1) != SSA_NAME)
-      || !has_single_use (lhs))
+  if ((TREE_CODE (op0) != SSA_NAME) || (TREE_CODE (op1) != SSA_NAME))
+    return false;
+  if (!outer && !has_single_use (lhs))
     return false;
 
   bb = gimple_bb (g);
@@ -284,7 +286,7 @@ expand_ccmp_expr (gimple *g, machine_mode mode)
   rtx_insn *last;
   rtx tmp;
 
-  if (!ccmp_candidate_p (g))
+  if (!ccmp_candidate_p (g, true))
     return NULL_RTX;
 
   last = get_last_insn ();
diff --git a/gcc/cfgexpand.cc b/gcc/cfgexpand.cc
index 767982a63a9..316b8830ec0 100644
--- a/gcc/cfgexpand.cc
+++ b/gcc/cfgexpand.cc
@@ -3997,37 +3997,18 @@ expand_gimple_stmt_1 (gimple *stmt)
 	  {
 	    rtx target, temp;
 	    bool nontemporal = gimple_assign_nontemporal_move_p (assign_stmt);
-	    struct separate_ops ops;
 	    bool promoted = false;
 
 	    target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
 	    if (GET_CODE (target) == SUBREG && SUBREG_PROMOTED_VAR_P (target))
 	      promoted = true;
 
-	    ops.code = gimple_assign_rhs_code (assign_stmt);
-	    ops.type = TREE_TYPE (lhs);
-	    switch (get_gimple_rhs_class (ops.code))
-	      {
-		case GIMPLE_TERNARY_RHS:
-		  ops.op2 = gimple_assign_rhs3 (assign_stmt);
-		  /* Fallthru */
-		case GIMPLE_BINARY_RHS:
-		  ops.op1 = gimple_assign_rhs2 (assign_stmt);
-		  /* Fallthru */
-		case GIMPLE_UNARY_RHS:
-		  ops.op0 = gimple_assign_rhs1 (assign_stmt);
-		  break;
-		default:
-		  gcc_unreachable ();
-	      }
-	    ops.location = gimple_location (stmt);
-
-	    /* If we want to use a nontemporal store, force the value to
-	       register first.  If we store into a promoted register,
-	       don't directly expand to target.  */
+	   /* If we want to use a nontemporal store, force the value to
+	      register first.  If we store into a promoted register,
+	      don't directly expand to target.  */
 	    temp = nontemporal || promoted ? NULL_RTX : target;
-	    temp = expand_expr_real_2 (&ops, temp, GET_MODE (target),
-				       EXPAND_NORMAL);
+	    temp = expand_expr_real_gassign (assign_stmt, temp,
+					     GET_MODE (target), EXPAND_NORMAL);
 
 	    if (temp == target)
 	      ;
@@ -4039,7 +4020,7 @@ expand_gimple_stmt_1 (gimple *stmt)
 		if (CONSTANT_P (temp) && GET_MODE (temp) == VOIDmode)
 		  {
 		    temp = convert_modes (GET_MODE (target),
-					  TYPE_MODE (ops.type),
+					  TYPE_MODE (TREE_TYPE (lhs)),
 					  temp, unsignedp);
 		    temp = convert_modes (GET_MODE (SUBREG_REG (target)),
 					  GET_MODE (target), temp, unsignedp);
diff --git a/gcc/expr.cc b/gcc/expr.cc
index 502518d69c5..ee822c11dce 100644
--- a/gcc/expr.cc
+++ b/gcc/expr.cc
@@ -11038,6 +11038,62 @@ stmt_is_replaceable_p (gimple *stmt)
   return false;
 }
 
+/* A subroutine of expand_expr_real_1.  Expand gimple assignment G,
+   which is known to set an SSA_NAME result.  The other arguments are
+   as for expand_expr_real_1.  */
+
+rtx
+expand_expr_real_gassign (gassign *g, rtx target, machine_mode tmode,
+			  enum expand_modifier modifier, rtx *alt_rtl,
+			  bool inner_reference_p)
+{
+  separate_ops ops;
+  rtx r;
+  location_t saved_loc = curr_insn_location ();
+  auto loc = gimple_location (g);
+  if (loc != UNKNOWN_LOCATION)
+    set_curr_insn_location (loc);
+  tree lhs = gimple_assign_lhs (g);
+  ops.code = gimple_assign_rhs_code (g);
+  ops.type = TREE_TYPE (lhs);
+  switch (get_gimple_rhs_class (ops.code))
+    {
+    case GIMPLE_TERNARY_RHS:
+      ops.op2 = gimple_assign_rhs3 (g);
+      /* Fallthru */
+    case GIMPLE_BINARY_RHS:
+      ops.op1 = gimple_assign_rhs2 (g);
+
+      /* Try to expand conditonal compare.  */
+      if (targetm.gen_ccmp_first)
+	{
+	  gcc_checking_assert (targetm.gen_ccmp_next != NULL);
+	  r = expand_ccmp_expr (g, TYPE_MODE (ops.type));
+	  if (r)
+	    break;
+	}
+      /* Fallthru */
+    case GIMPLE_UNARY_RHS:
+      ops.op0 = gimple_assign_rhs1 (g);
+      ops.location = loc;
+      r = expand_expr_real_2 (&ops, target, tmode, modifier);
+      break;
+    case GIMPLE_SINGLE_RHS:
+      {
+	r = expand_expr_real (gimple_assign_rhs1 (g), target,
+			      tmode, modifier, alt_rtl,
+			      inner_reference_p);
+	break;
+      }
+    default:
+      gcc_unreachable ();
+    }
+  set_curr_insn_location (saved_loc);
+  if (REG_P (r) && !REG_EXPR (r))
+    set_reg_attrs_for_decl_rtl (lhs, r);
+  return r;
+}
+
 rtx
 expand_expr_real_1 (tree exp, rtx target, machine_mode tmode,
 		    enum expand_modifier modifier, rtx *alt_rtl,
@@ -11201,51 +11257,8 @@ expand_expr_real_1 (tree exp, rtx target, machine_mode tmode,
 	  && stmt_is_replaceable_p (SSA_NAME_DEF_STMT (exp)))
 	g = SSA_NAME_DEF_STMT (exp);
       if (g)
-	{
-	  rtx r;
-	  location_t saved_loc = curr_insn_location ();
-	  loc = gimple_location (g);
-	  if (loc != UNKNOWN_LOCATION)
-	    set_curr_insn_location (loc);
-	  ops.code = gimple_assign_rhs_code (g);
-          switch (get_gimple_rhs_class (ops.code))
-	    {
-	    case GIMPLE_TERNARY_RHS:
-	      ops.op2 = gimple_assign_rhs3 (g);
-	      /* Fallthru */
-	    case GIMPLE_BINARY_RHS:
-	      ops.op1 = gimple_assign_rhs2 (g);
-
-	      /* Try to expand conditonal compare.  */
-	      if (targetm.gen_ccmp_first)
-		{
-		  gcc_checking_assert (targetm.gen_ccmp_next != NULL);
-		  r = expand_ccmp_expr (g, mode);
-		  if (r)
-		    break;
-		}
-	      /* Fallthru */
-	    case GIMPLE_UNARY_RHS:
-	      ops.op0 = gimple_assign_rhs1 (g);
-	      ops.type = TREE_TYPE (gimple_assign_lhs (g));
-	      ops.location = loc;
-	      r = expand_expr_real_2 (&ops, target, tmode, modifier);
-	      break;
-	    case GIMPLE_SINGLE_RHS:
-	      {
-		r = expand_expr_real (gimple_assign_rhs1 (g), target,
-				      tmode, modifier, alt_rtl,
-				      inner_reference_p);
-		break;
-	      }
-	    default:
-	      gcc_unreachable ();
-	    }
-	  set_curr_insn_location (saved_loc);
-	  if (REG_P (r) && !REG_EXPR (r))
-	    set_reg_attrs_for_decl_rtl (SSA_NAME_VAR (exp), r);
-	  return r;
-	}
+	return expand_expr_real_gassign (as_a<gassign *> (g), target, tmode,
+					 modifier, alt_rtl, inner_reference_p);
 
       ssa_name = exp;
       decl_rtl = get_rtx_for_ssa_name (ssa_name);
diff --git a/gcc/expr.h b/gcc/expr.h
index f04f40da6ab..64956f63029 100644
--- a/gcc/expr.h
+++ b/gcc/expr.h
@@ -302,6 +302,9 @@ extern rtx expand_expr_real_1 (tree, rtx, machine_mode,
 			       enum expand_modifier, rtx *, bool);
 extern rtx expand_expr_real_2 (sepops, rtx, machine_mode,
 			       enum expand_modifier);
+extern rtx expand_expr_real_gassign (gassign *, rtx, machine_mode,
+				     enum expand_modifier modifier,
+				     rtx * = nullptr, bool = false);
 
 /* Generate code for computing expression EXP.
    An rtx for the computed value is returned.  The value is never null.
diff --git a/gcc/testsuite/gcc.target/aarch64/ccmp_3.c b/gcc/testsuite/gcc.target/aarch64/ccmp_3.c
new file mode 100644
index 00000000000..a2b47fbee14
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/ccmp_3.c
@@ -0,0 +1,20 @@
+/* { dg-options "-O2" } */
+/* PR target/100942 */
+
+void foo(void);
+int f1(int a, int b)
+{
+  int c = a == 0 || b == 0;
+  if (c) foo();
+  return c;
+}
+
+/* We should get one cmp followed by ccmp and one cset. */
+/* { dg-final { scan-assembler "\tccmp\t" } } */
+/* { dg-final { scan-assembler-times "\tcset\t" 1 } } */
+/* { dg-final { scan-assembler-times "\tcmp\t" 1 } } */
+/* And not get 2 cmps and 2 (or more cset) and orr and a cbnz. */
+/* { dg-final { scan-assembler-not "\torr\t" } } */
+/* { dg-final { scan-assembler-not "\tcbnz\t" } } */
+/* { dg-final { scan-assembler-not "\tcbz\t" } } */
+
diff --git a/gcc/testsuite/gcc.target/aarch64/ccmp_4.c b/gcc/testsuite/gcc.target/aarch64/ccmp_4.c
new file mode 100644
index 00000000000..bc0f57a7c59
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/ccmp_4.c
@@ -0,0 +1,35 @@
+/* { dg-options "-O2" } */
+/* PR target/100942 */
+
+void foo(void);
+int f1(int a, int b, int d)
+{
+  int c = a < 8 || b < 9;
+  int e = d < 11 || c;
+  if (e) foo();
+  return c;
+}
+
+/*
+  We really should get:
+        cmp     w0, 7
+        ccmp    w1, 8, 4, gt
+        cset    w0, le
+        ccmp    w2, 10, 4, gt
+        ble     .L11
+
+  But we currently get:
+        cmp     w0, 7
+        ccmp    w1, 8, 4, gt
+        cset    w0, le
+        cmp     w0, 0
+        ccmp    w2, 10, 4, eq
+        ble     .L11
+  The middle cmp is not needed.
+ */
+
+/* We should end up with only one cmp and 2 ccmp and 1 cset but currently we get 2 cmp
+   though. */
+/* { dg-final { scan-assembler-times "\tccmp\t" 2 } } */
+/* { dg-final { scan-assembler-times "\tcset\t" 1 } } */
+/* { dg-final { scan-assembler-times "\tcmp\t" 1 { xfail *-*-* } } } */
diff --git a/gcc/testsuite/gcc.target/aarch64/ccmp_5.c b/gcc/testsuite/gcc.target/aarch64/ccmp_5.c
new file mode 100644
index 00000000000..7e52ae4f322
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/ccmp_5.c
@@ -0,0 +1,20 @@
+
+/* { dg-options "-O2" } */
+/* PR target/100942 */
+void f1(int a, int b, _Bool *x)
+{
+  x[0] = x[1] = a == 0 || b == 0;
+}
+
+void f2(int a, int b, int *x)
+{
+  x[0] = x[1] = a == 0 || b == 0;
+}
+
+
+/* Both functions should be using ccmp rather than 2 cset/orr.  */
+/* { dg-final { scan-assembler-times "\tccmp\t" 2 } } */
+/* { dg-final { scan-assembler-times "\tcset\t" 2 } } */
+/* { dg-final { scan-assembler-times "\tcmp\t" 2 } } */
+/* { dg-final { scan-assembler-not "\torr\t" } } */
+