[PATCH], PR target/99708 - Define __SIZEOF_FLOAT128__ and __SIZEOF_IBM128__

[Michael Meissner via Gcc-patches]

Define __SIZEOF_FLOAT128__ and __SIZEOF_IBM128__.

Define the sizes of the PowerPC specific types __float128 and __ibm128 if those
types are enabled.

I tested this on a little endian power9 system and there were no regressions.
Can I check this into the trunk, and after a burn-in period, can I check this
into the GCC 10 and 11 branches?

2022-02-15  Michael Meissner  <meiss...@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.
---
 gcc/config/rs6000/rs6000-c.cc              | 12 ++++++++++--
 gcc/testsuite/gcc.target/powerpc/pr99708.c | 21 +++++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/powerpc/pr99708.c

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..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;
+}
+
-- 
2.35.1


-- 
Michael Meissner, IBM
PO Box 98, Ayer, Massachusetts, USA, 01432
email: meiss...@linux.ibm.com