diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e5cc44dd937..5a5884e4918 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2017-04-25  Martin Sebor  <msebor@redhat.com>
+
+	PR tree-optimization/80497
+	* gimple-ssa-sprintf.c (get_int_range): Avoid assuming all integer
+	constants are representable in HOST_WIDE_INT.
+	(parse_directive): Ditto.
+
 2017-04-25  Marek Polacek  <polacek@redhat.com>
 
 	2017-04-25  Marek Polacek  <polacek@redhat.com>
diff --git a/gcc/gimple-ssa-sprintf.c b/gcc/gimple-ssa-sprintf.c
index 2e62086e2d1..d3771ddcc67 100644
--- a/gcc/gimple-ssa-sprintf.c
+++ b/gcc/gimple-ssa-sprintf.c
@@ -948,7 +948,8 @@ get_int_range (tree arg, HOST_WIDE_INT *pmin, HOST_WIDE_INT *pmax,
       *pmin = tree_to_shwi (TYPE_MIN_VALUE (type));
       *pmax = tree_to_shwi (TYPE_MAX_VALUE (type));
     }
-  else if (TREE_CODE (arg) == INTEGER_CST)
+  else if (TREE_CODE (arg) == INTEGER_CST
+	   && TYPE_PRECISION (TREE_TYPE (arg)) <= TYPE_PRECISION (type))
     {
       /* For a constant argument return its value adjusted as specified
 	 by NEGATIVE and NEGBOUND and return true to indicate that the
@@ -2916,7 +2917,9 @@ parse_directive (pass_sprintf_length::call_info &info,
       if (width != -1)
 	dollar = width + info.argidx;
       else if (star_width
-	       && TREE_CODE (star_width) == INTEGER_CST)
+	       && TREE_CODE (star_width) == INTEGER_CST
+	       && (TYPE_PRECISION (TREE_TYPE (star_width))
+		   <= TYPE_PRECISION (integer_type_node)))
 	dollar = width + tree_to_shwi (star_width);
 
       /* Bail when the numbered argument is out of range (it will
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 48e862c505b..2369d78617b 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-04-25  Martin Sebor  <msebor@redhat.com>
+
+	PR tree-optimization/80497
+	* gcc.dg/tree-ssa/builtin-sprintf-warn-17.c: New test.
+
 2017-04-25  Marek Polacek  <polacek@redhat.com>
 
 	2017-04-25  Marek Polacek  <polacek@redhat.com>
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-17.c b/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-17.c
new file mode 100644
index 00000000000..27aa8398341
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-17.c
@@ -0,0 +1,42 @@
+/* PR tree-optimization/80497 - ICE at -O1 and above on valid code on
+   x86_64-linux-gnu in "tree_to_uhwi"
+   { dg-do compile }
+   { dg-options "-O2 -Wall -Wformat-overflow" }
+   { dg-require-effective-target int128 } */
+
+extern char buf[];
+
+const __int128_t sint128_max
+  = (__int128_t)1 << (sizeof sint128_max * __CHAR_BIT__ - 2);
+
+void fn0 (void)
+{
+  __int128_t si128 = 0;
+
+  __builtin_sprintf (buf, "%*i", si128, 0);
+
+  __builtin_sprintf (buf, "%.*i", si128, 0);
+
+  __builtin_sprintf (buf, "%i", si128);
+
+  __builtin_sprintf (buf, "%2$*1$i", si128, 0);
+
+  __builtin_sprintf (buf, "%2$.*1$i", si128, 0);
+}
+
+void fn1 (void)
+{
+  __int128_t si128 = sint128_max;
+
+  __builtin_sprintf (buf, "%*i", si128, 0);
+
+  __builtin_sprintf (buf, "%.*i", si128, 0);
+
+  __builtin_sprintf (buf, "%i", si128);
+
+  __builtin_sprintf (buf, "%2$*1$i", si128, 0);
+
+  __builtin_sprintf (buf, "%2$.*1$i", si128, 0);
+}
+
+/* { dg-prune-output "expects argument of type .int." } */