Merge pull request #7843 from tautschnig/bugfixes/__float128

Fix __float128 portability

Author: kroening

regression/ansi-c/gcc_version1/gcc-5.c

@@ -9,5 +9,9 @@ typedef long double _Float128;
 typedef long double _Float128x;
 
 // But this type should:
+// https://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html
+#  if defined(__i386__) || defined(__x86_64__) || defined(__ia64__) ||         \
+    defined(__hppa__) || defined(__powerpc__)
 __float128 f128;
 #endif
+#endif

regression/ansi-c/gcc_version1/gcc-7.c

@@ -8,5 +8,9 @@ _Float64x f64x;
 _Float128 f128;
 _Float128x f128x;
 
+// https://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html
+#  if defined(__i386__) || defined(__x86_64__) || defined(__ia64__) ||         \
+    defined(__hppa__) || defined(__powerpc__)
 __float128 gcc_f128;
 #endif
+#endif

regression/cbmc/ts18661_typedefs/main.c

@@ -19,7 +19,11 @@
 #    endif
 
 #    if __GNUC_PREREQ(4, FLOAT128_MINOR_VERSION)
-#      define HAS_FLOAT128
+// https://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html
+#      if defined(__i386__) || defined(__x86_64__) || defined(__ia64__) ||     \
+        defined(__hppa__) || defined(__powerpc__)
+#        define HAS_FLOAT128
+#      endif
 #    endif
 
 #  endif

src/cpp/cpp_internal_additions.cpp

@@ -111,9 +111,8 @@ void cpp_internal_additions(std::ostream &out)
 
     if(
       config.ansi_c.arch == "i386" || config.ansi_c.arch == "x86_64" ||
-      config.ansi_c.arch == "x32" || config.ansi_c.arch == "powerpc" ||
-      config.ansi_c.arch == "ppc64" || config.ansi_c.arch == "ppc64le" ||
-      config.ansi_c.arch == "ia64")
+      config.ansi_c.arch == "x32" || config.ansi_c.arch == "ia64" ||
+      config.ansi_c.arch == "powerpc" || config.ansi_c.arch == "ppc64")
     {
       // https://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html
       // For clang, __float128 is a keyword.
@@ -131,6 +130,12 @@ void cpp_internal_additions(std::ostream &out)
       if(config.ansi_c.mode != configt::ansi_ct::flavourt::CLANG)
         out << "typedef long double __float128;" << '\n';
     }
+    else if(config.ansi_c.arch == "ppc64le")
+    {
+      // https://patchwork.ozlabs.org/patch/792295/
+      if(config.ansi_c.mode != configt::ansi_ct::flavourt::CLANG)
+        out << "typedef " CPROVER_PREFIX "Float128 __ieee128;\n";
+    }
 
     if(
       config.ansi_c.arch == "i386" || config.ansi_c.arch == "x86_64" ||