[gcc(refs/users/meissner/heads/work020)] PowerPC: Update tests to run if long double is IEEE 128-bit.

[Michael Meissner]

https://gcc.gnu.org/g:6792cc7cc9216da21c4f1c33e610afc471d6c2f6

commit 6792cc7cc9216da21c4f1c33e610afc471d6c2f6
Author: Michael Meissner <meissner@linux.ibm.com>
Date:   Tue Oct 13 10:31:41 2020 -0400

    PowerPC: Update tests to run if long double is IEEE 128-bit.
    
    gcc/testsuite/
    2020-10-13  Michael Meissner  <meissner@linux.ibm.com>
    
            * c-c++-common/dfp/convert-bfp-11.c: If long double is IEEE
            128-bit, skip the test.
            * gcc.dg/nextafter-2.c: On PowerPC, if long double is IEEE
            128-bit, include math.h to get the built-in mapped correctly.
            * gcc.target/powerpc/pr70117.c: Add support for long double being
            IEEE 128-bit.

Diff:
---
 gcc/testsuite/c-c++-common/dfp/convert-bfp-11.c |  7 +++++++
 gcc/testsuite/gcc.dg/nextafter-2.c              | 10 ++++++++++
 gcc/testsuite/gcc.target/powerpc/pr70117.c      |  6 ++++--
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/gcc/testsuite/c-c++-common/dfp/convert-bfp-11.c b/gcc/testsuite/c-c++-common/dfp/convert-bfp-11.c
index 95c433d2c24..6ee0c1c6ae9 100644
--- a/gcc/testsuite/c-c++-common/dfp/convert-bfp-11.c
+++ b/gcc/testsuite/c-c++-common/dfp/convert-bfp-11.c
@@ -5,6 +5,7 @@
    Don't force 128-bit long doubles because runtime support depends
    on glibc.  */
 
+#include <float.h>
 #include "convert.h"
 
 volatile _Decimal32 sd;
@@ -39,6 +40,12 @@ main ()
   if (sizeof (long double) != 16)
     return 0;
 
+  /* This test is written to test IBM extended double, which is a pair of
+     doubles.  If long double can hold a larger value than a double can, such
+     as when long double is IEEE 128-bit, just exit immediately.  */
+  if (LDBL_MAX_10_EXP > DBL_MAX_10_EXP)
+    return 0;
+
   convert_101 ();
   convert_102 ();
 
diff --git a/gcc/testsuite/gcc.dg/nextafter-2.c b/gcc/testsuite/gcc.dg/nextafter-2.c
index e51ae94be0c..64e9e3c485f 100644
--- a/gcc/testsuite/gcc.dg/nextafter-2.c
+++ b/gcc/testsuite/gcc.dg/nextafter-2.c
@@ -13,4 +13,14 @@
 #  define NO_LONG_DOUBLE 1
 # endif
 #endif
+
+#if defined(_ARCH_PPC) && defined(__LONG_DOUBLE_IEEE128__)
+/* On PowerPC systems, long double uses either the IBM long double format, or
+   IEEE 128-bit format.  The compiler switches the long double built-in
+   function names and glibc switches the names when math.h is included.
+   Because this test is run with -fno-builtin, include math.h so that the
+   appropriate nextafter functions are called.  */
+#include <math.h>
+#endif
+
 #include "nextafter-1.c"
diff --git a/gcc/testsuite/gcc.target/powerpc/pr70117.c b/gcc/testsuite/gcc.target/powerpc/pr70117.c
index 3bbd2c595e0..928efe39c7b 100644
--- a/gcc/testsuite/gcc.target/powerpc/pr70117.c
+++ b/gcc/testsuite/gcc.target/powerpc/pr70117.c
@@ -9,9 +9,11 @@
    128-bit floating point, because the type is not enabled on those
    systems.  */
 #define LDOUBLE __ibm128
+#define IBM128_MAX ((__ibm128) 1.79769313486231580793728971405301199e+308L)
 
 #elif defined(__LONG_DOUBLE_IBM128__)
 #define LDOUBLE long double
+#define IBM128_MAX LDBL_MAX
 
 #else
 #error "long double must be either IBM 128-bit or IEEE 128-bit"
@@ -75,10 +77,10 @@ main (void)
   if (__builtin_isnormal (ld))
     __builtin_abort ();
 
-  ld = LDBL_MAX;
+  ld = IBM128_MAX;
   if (!__builtin_isnormal (ld))
     __builtin_abort ();
-  ld = -LDBL_MAX;
+  ld = -IBM128_MAX;
   if (!__builtin_isnormal (ld))
     __builtin_abort ();