[gcc(refs/users/meissner/heads/work078)] Define __SIZEOF_FLOAT128__ and __SIZEOF_IBM128__.

[Michael Meissner]

https://gcc.gnu.org/g:458834e27382b840b6ce6a246821cf5072fa8d0f

commit 458834e27382b840b6ce6a246821cf5072fa8d0f
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Mon Feb 14 23:58:04 2022 -0500

    Define __SIZEOF_FLOAT128__ and __SIZEOF_IBM128__.
    
    Define the sizes of the PowerPC specific types __float128 and __ibm128.
    
    2022-02-15  Michael Meissner  <meissner@the-meissners.org>
    
    gcc/
            PR target/99708
            * config/rs6000/rs6000-c.cc (rs6000_target_modify_macros): Define
            __SIZEOF_FLOAT128__ and __SIZEOF_IBM128__ if we have float128
            support.
    
    gcc/testsuite/
            PR target/99708
            * gcc.target/powerpc/pr99708.c: New test.

Diff:
---
 gcc/config/rs6000/rs6000-c.cc              | 12 ++++++++++--
 gcc/testsuite/gcc.target/powerpc/pr99708.c | 19 +++++++++++++++++++
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/gcc/config/rs6000/rs6000-c.cc b/gcc/config/rs6000/rs6000-c.cc
index 15251efc209..b5f771d1308 100644
--- a/gcc/config/rs6000/rs6000-c.cc
+++ b/gcc/config/rs6000/rs6000-c.cc
@@ -581,9 +581,17 @@ rs6000_target_modify_macros (bool define_p, HOST_WIDE_INT flags,
     {
       rs6000_define_or_undefine_macro (define_p, "__FLOAT128__");
       if (define_p)
-	rs6000_define_or_undefine_macro (true, "__float128=__ieee128");
+	{
+	  rs6000_define_or_undefine_macro (true, "__float128=__ieee128");
+	  rs6000_define_or_undefine_macro (true, "__SIZEOF_FLOAT128__=16");
+	  rs6000_define_or_undefine_macro (true, "__SIZEOF_IBM128__=16");
+	}
       else
-	rs6000_define_or_undefine_macro (false, "__float128");
+	{
+	  rs6000_define_or_undefine_macro (false, "__float128");
+	  rs6000_define_or_undefine_macro (false, "__SIZEOF_FLOAT128__");
+	  rs6000_define_or_undefine_macro (false, "__SIZEOF_IBM128__");
+	}
     }
   /* OPTION_MASK_FLOAT128_HARDWARE can be turned on if -mcpu=power9 is used or
      via the target attribute/pragma.  */
diff --git a/gcc/testsuite/gcc.target/powerpc/pr99708.c b/gcc/testsuite/gcc.target/powerpc/pr99708.c
new file mode 100644
index 00000000000..dd7a3bccc03
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr99708.c
@@ -0,0 +1,19 @@
+/* { 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.
+ */
+
+int main (void)
+{
+  if (__SIZEOF_FLOAT128__ != sizeof (__float128)
+      || __SIZEOF_IBM128 != sizeof (__ibm128))
+    abort ();
+
+  return 0;
+}
+