--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/PCH/floating-literal.c	Thu Feb 13 15:10:13 2020 +0900
@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -triple mips64-none-linux-gnu -emit-pch -o %t %s
+// REQUIRES: mips-registered-target
+// RUN: %clang_cc1 -x ast -ast-print %t | FileCheck %s
+
+// Make sure the semantics of FloatingLiterals are stored correctly in
+// the AST. Previously, the ASTWriter didn't store anything and the
+// reader assumed PPC 128-bit float semantics, which is incorrect for
+// targets with 128-bit IEEE long doubles.
+
+long double foo = 1.0E4000L;
+// CHECK: long double foo = 1.00000000000000000000000000000000004E+4000L;
+
+// Just as well check the others are still sane while we're here...
+
+double bar = 1.0E300;
+// CHECK: double bar = 1.0000000000000001E+300;
+
+float wibble = 1.0E40;
+// CHECK: float wibble = 1.0E+40;