rs6000: float128 on BE and 32-bit

This fixes float128 on BE and on 32-bit.

The configure tests need to use -mabi=altivec for 32-bit, since it is
not the default there.  That also enables the "vector" keyword, used by
the tests.  To do this it temporarily adds a few flags to the CFLAGS
variable.

It also fixes a syntax error in the libgcc_cv_powerpc_float128_hw test
(the function name was missing in the function declaration).

Regenerating config.in (via autoreconf) removed the duplicate definition
of HAVE_SOLARIS_CRTS.

Finally, this adds a "-mfloat128-hardware requires -m64" test to
rs6000.c: all the current patterns need 64-bit registers.  Maybe we'll
want to add float128 hardware support to 32-bit some day, but certainly
not today.


	* config/rs6000/rs6000.c (rs6000_option_override_internal): Disallow
	-mfloat128-hardware without -m64.

libgcc/
	* configure.ac (test for libgcc_cv_powerpc_float128): Temporarily
	modify CFLAGS.  Add -mabi=altivec -mvsx -mfloat128.
	(test for libgcc_cv_powerpc_float128_hw): Add -mpower9-vector and
	-mfloat128-hardware to the CFLAGS.  Fix syntax error in the C snippet.
	* configure: Regenerate.
	* config.in: Regenerate.

From-SVN: r246043

4 files changed, 23 insertions, 13 deletions

diff --git a/libgcc/ChangeLog b/libgcc/ChangeLog
index 476f610..470fbb7 100644
--- a/libgcc/ChangeLog
+++ b/libgcc/ChangeLog
@@ -1,3 +1,12 @@
+2017-03-10  Segher Boessenkool  <segher@kernel.crashing.org>
+
+	* configure.ac (test for libgcc_cv_powerpc_float128): Temporarily
+	modify CFLAGS.  Add -mabi=altivec -mvsx -mfloat128.
+	(test for libgcc_cv_powerpc_float128_hw): Add -mpower9-vector and
+	-mfloat128-hardware to the CFLAGS.  Fix syntax error in the C snippet.
+	* configure: Regenerate.
+	* config.in: Regenerate.
+
 2017-03-02  Jonathan Yong <10walls@gmail.com>
 
 	* config/i386/gthr-win32.h: Define NOGDI before
diff --git a/libgcc/config.in b/libgcc/config.in
index 4d33411..25aa0d9 100644
--- a/libgcc/config.in
+++ b/libgcc/config.in
@@ -21,9 +21,6 @@
 /* Define if the system-provided CRTs are present on Solaris. */
 #undef HAVE_SOLARIS_CRTS
 
-/* Define if the system-provided CRTs are present on Solaris. */
-#undef HAVE_SOLARIS_CRTS
-
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H
 
diff --git a/libgcc/configure b/libgcc/configure
index 5c900cc..45c4597 100644
--- a/libgcc/configure
+++ b/libgcc/configure
@@ -4779,6 +4779,8 @@ case ${host} in
 # software libraries, and whether the assembler can handle xsaddqp
 # for hardware support.
 powerpc*-*-linux*)
+  saved_CFLAGS="$CFLAGS"
+  CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PowerPC ISA 2.06 to build __float128 libraries" >&5
 $as_echo_n "checking for PowerPC ISA 2.06 to build __float128 libraries... " >&6; }
 if test "${libgcc_cv_powerpc_float128+set}" = set; then :
@@ -4786,8 +4788,7 @@ if test "${libgcc_cv_powerpc_float128+set}" = set; then :
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#pragma GCC target ("vsx")
-     vector double dadd (vector double a, vector double b) { return a + b; }
+vector double dadd (vector double a, vector double b) { return a + b; }
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
   libgcc_cv_powerpc_float128=yes
@@ -4799,6 +4800,7 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgcc_cv_powerpc_float128" >&5
 $as_echo "$libgcc_cv_powerpc_float128" >&6; }
 
+  CFLAGS="$CFLAGS -mpower9-vector -mfloat128-hardware"
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PowerPC ISA 3.0 to build hardware __float128 libraries" >&5
 $as_echo_n "checking for PowerPC ISA 3.0 to build hardware __float128 libraries... " >&6; }
 if test "${libgcc_cv_powerpc_float128_hw+set}" = set; then :
@@ -4806,12 +4808,11 @@ if test "${libgcc_cv_powerpc_float128_hw+set}" = set; then :
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
-#pragma GCC target ("vsx,power9-vector")
-     #include <sys/auxv.h>
+#include <sys/auxv.h>
      #ifndef AT_PLATFORM
      #error "AT_PLATFORM is not defined"
      #endif
-     vector unsigned char (vector unsigned char a, vector unsigned char b)
+     vector unsigned char add (vector unsigned char a, vector unsigned char b)
      {
        vector unsigned char ret;
        __asm__ ("xsaddqp %0,%1,%2" : "=v" (ret) : "v" (a), "v" (b));
@@ -4830,6 +4831,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgcc_cv_powerpc_float128_hw" >&5
 $as_echo "$libgcc_cv_powerpc_float128_hw" >&6; }
+  CFLAGS="$saved_CFLAGS"
 esac
 
 # Collect host-machine-specific information.
diff --git a/libgcc/configure.ac b/libgcc/configure.ac
index ea2030f..af15147 100644
--- a/libgcc/configure.ac
+++ b/libgcc/configure.ac
@@ -379,23 +379,24 @@ case ${host} in
 # software libraries, and whether the assembler can handle xsaddqp
 # for hardware support.
 powerpc*-*-linux*)
+  saved_CFLAGS="$CFLAGS"
+  CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
   AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries],
 		 [libgcc_cv_powerpc_float128],
 		 [AC_COMPILE_IFELSE(
-    [#pragma GCC target ("vsx")
-     vector double dadd (vector double a, vector double b) { return a + b; }],
+    [vector double dadd (vector double a, vector double b) { return a + b; }],
     [libgcc_cv_powerpc_float128=yes],
     [libgcc_cv_powerpc_float128=no])])
 
+  CFLAGS="$CFLAGS -mpower9-vector -mfloat128-hardware"
   AC_CACHE_CHECK([for PowerPC ISA 3.0 to build hardware __float128 libraries],
 		 [libgcc_cv_powerpc_float128_hw],
 		 [AC_COMPILE_IFELSE(
-    [#pragma GCC target ("vsx,power9-vector")
-     #include <sys/auxv.h>
+    [#include <sys/auxv.h>
      #ifndef AT_PLATFORM
      #error "AT_PLATFORM is not defined"
      #endif
-     vector unsigned char (vector unsigned char a, vector unsigned char b)
+     vector unsigned char add (vector unsigned char a, vector unsigned char b)
      {
        vector unsigned char ret;
        __asm__ ("xsaddqp %0,%1,%2" : "=v" (ret) : "v" (a), "v" (b));
@@ -406,6 +407,7 @@ powerpc*-*-linux*)
 	__attribute__ ((__ifunc__ ("add_resolver")));],
     [libgcc_cv_powerpc_float128_hw=yes],
     [libgcc_cv_powerpc_float128_hw=no])])
+  CFLAGS="$saved_CFLAGS"
 esac
 
 # Collect host-machine-specific information.