diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 270180f7e04..145195c21bc 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2018-11-08  Martin Liska  <mliska@suse.cz>
+
+	* doc/extend.texi: Reword.
+	* predict.c (expr_expected_value_1): Likewise.
+
 2018-11-08  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/87913
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 8de92da93fb..dc8fc6e2c4a 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -12047,7 +12047,7 @@ This function has the same semantics as @code{__builtin_expect},
 but the caller provides the expected probability that @var{exp} == @var{c}.
 The last argument, @var{probability}, is a floating-point value in the
 range 0.0 to 1.0, inclusive.  The @var{probability} argument must be
-a compiler time constant.
+constant floating-point expression.
 @end deftypefn
 
 @deftypefn {Built-in Function} void __builtin_trap (void)
diff --git a/gcc/predict.c b/gcc/predict.c
index 80a8d6846f7..8482737ab27 100644
--- a/gcc/predict.c
+++ b/gcc/predict.c
@@ -2470,8 +2470,8 @@ expr_expected_value_1 (tree type, tree op0, enum tree_code code,
 		  if (TREE_CODE (r) != REAL_CST)
 		    {
 		      error_at (gimple_location (def),
-				"probability argument %qE must be a compile "
-				"time constant", prob);
+				"probability %qE must be "
+				"constant floating-point expression", prob);
 		      return NULL;
 		    }
 		  HOST_WIDE_INT probi
@@ -2483,8 +2483,8 @@ expr_expected_value_1 (tree type, tree op0, enum tree_code code,
 		    }
 		  else
 		    error_at (gimple_location (def),
-			      "probability argument %qE must be a in the "
-			      "range 0.0 to 1.0", prob);
+			      "probability %qE is outside "
+			      "the range [0.0, 1.0]", prob);
 
 		  return gimple_call_arg (def, 1);
 		}
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 3584dfbfded..773fcce06e7 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-11-08  Martin Liska  <mliska@suse.cz>
+
+	* gcc.dg/pr87811.c: Update scanned pattern.
+	* gcc.dg/pr87811-2.c: Likewise.
+
 2018-11-08  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* g++.dg/lto/pr87906_0.C: Use moon instead of possibly predefined
diff --git a/gcc/testsuite/gcc.dg/pr87811-2.c b/gcc/testsuite/gcc.dg/pr87811-2.c
index aa30ddff47b..8b0818756e2 100644
--- a/gcc/testsuite/gcc.dg/pr87811-2.c
+++ b/gcc/testsuite/gcc.dg/pr87811-2.c
@@ -6,7 +6,7 @@ void bar (void);
 void
 foo (int i)
 {
-  if (__builtin_expect_with_probability (i, 0, 2.0f)) /* { dg-error "probability argument .* must be a in the range 0\\\.0 to 1\\\.0" } */
+  if (__builtin_expect_with_probability (i, 0, 2.0f)) /* { dg-error "probability .* is outside the range \\\[0\\\.0, 1\\\.0\\\]" } */
     bar ();
 }
 
diff --git a/gcc/testsuite/gcc.dg/pr87811.c b/gcc/testsuite/gcc.dg/pr87811.c
index 9045c8ea957..110b3835975 100644
--- a/gcc/testsuite/gcc.dg/pr87811.c
+++ b/gcc/testsuite/gcc.dg/pr87811.c
@@ -6,7 +6,7 @@ void bar (void);
 void
 foo (int i, double d)
 {
-  if (__builtin_expect_with_probability (i, 0, d)) /* { dg-error "probability argument .d. must be a compile time constant" } */
+  if (__builtin_expect_with_probability (i, 0, d)) /* { dg-error "probability .d. must be constant floating-point expression" } */
     bar ();
 }