[gcc r10-10486] Define __SIZEOF_FLOAT128__ and __SIZEOF_IBM128__.

[gcc r10-10486] Define __SIZEOF_FLOAT128__ and __SIZEOF_IBM128__.

[Michael Meissner]

https://gcc.gnu.org/g:641b407763ecfee5d4ac86d8ffe9eb1eeea5fd10

commit r10-10486-g641b407763ecfee5d4ac86d8ffe9eb1eeea5fd10
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Sat Mar 5 20:11:38 2022 -0500

    Define __SIZEOF_FLOAT128__ and __SIZEOF_IBM128__.
    
    Define the sizes of the PowerPC specific types __float128 and __ibm128 if those
    types are enabled.
    
    This patch will define __SIZEOF_IBM128__ and __SIZEOF_FLOAT128__ if their
    respective types are created in the compiler.  Currently, this means both of
    these will be defined if float128 support is enabled.  But at some point in
    the future, __ibm128 could be enabled without enabling float128 support and
    __SIZEOF_IBM128__ would be defined.
    
    2022-03-05  Michael Meissner  <meissner@the-meissners.org>
    
    gcc/
            PR target/99708
            * config/rs6000/rs6000-c.c (rs6000_cpu_cpp_builtins): Define
            __SIZEOF_IBM128__ if the IBM 128-bit long double type is created.
            Define __SIZEOF_FLOAT128__ if the IEEE 128-bit floating point type
            is created.  Backport change to master branch on 2022-02-17.
    
    gcc/testsuite/
            PR target/99708
            * gcc.target/powerpc/pr99708.c: New test.  Backport change to
            master branch on 2022-02-17.

Diff:
---
 gcc/config/rs6000/rs6000-c.c               |  6 +++++-
 gcc/testsuite/gcc.target/powerpc/pr99708.c | 21 +++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/gcc/config/rs6000/rs6000-c.c b/gcc/config/rs6000/rs6000-c.c
index e2fa2cdc88f..eec8c89d1b6 100644
--- a/gcc/config/rs6000/rs6000-c.c
+++ b/gcc/config/rs6000/rs6000-c.c
@@ -620,7 +620,11 @@ rs6000_cpu_cpp_builtins (cpp_reader *pfile)
   if (TARGET_FRSQRTES)
     builtin_define ("__RSQRTEF__");
   if (TARGET_FLOAT128_TYPE)
-    builtin_define ("__FLOAT128_TYPE__");
+      builtin_define ("__FLOAT128_TYPE__");
+  if (ibm128_float_type_node)
+    builtin_define ("__SIZEOF_IBM128__=16");
+  if (ieee128_float_type_node)
+    builtin_define ("__SIZEOF_FLOAT128__=16");
 #ifdef TARGET_LIBC_PROVIDES_HWCAP_IN_TCB
   builtin_define ("__BUILTIN_CPU_SUPPORTS__");
 #endif
diff --git a/gcc/testsuite/gcc.target/powerpc/pr99708.c b/gcc/testsuite/gcc.target/powerpc/pr99708.c
new file mode 100644
index 00000000000..d478f7bc4c0
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr99708.c
@@ -0,0 +1,21 @@
+/* { dg-do run } */
+/* { require-effective-target ppc_float128_sw } */
+/* { dg-options "-O2 -mvsx -mfloat128" } */
+
+/*
+ * PR target/99708
+ *
+ * Verify that __SIZEOF_FLOAT128__ and __SIZEOF_IBM128__ are properly defined.
+ */
+
+#include <stdlib.h>
+
+int main (void)
+{
+  if (__SIZEOF_FLOAT128__ != sizeof (__float128)
+      || __SIZEOF_IBM128__ != sizeof (__ibm128))
+    abort ();
+
+  return 0;
+}
+