rs6000.c (rs6000_emit_move): If we load or store a long double type...

[gcc]
2018-01-17  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_emit_move): If we load or store a
	long double type, set the flags for noting the default long double
	type, even if we don't pass or return a long double type.

[gcc/testsuite]
2018-01-17  Michael Meissner  <meissner@linux.vnet.ibm.com>

	* gcc.target/powerpc/gnuattr1.c: New test to make sure we set the
	appropriate .gnu_attribute for the long double type, if we use the
	long double type, but do not generate any calls.
	* gcc.target/powerpc/gnuattr2.c: Likewise.
	* gcc.target/powerpc/gnuattr3.c: Likewise.

From-SVN: r256822

gcc/ChangeLog

+2018-01-17  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	* config/rs6000/rs6000.c (rs6000_emit_move): If we load or store a
+	long double type, set the flags for noting the default long double
+	type, even if we don't pass or return a long double type.
+
 2018-01-17  Jan Hubicka  <hubicka@ucw.cz>
 
 	PR ipa/83051

gcc/config/rs6000/rs6000.c

@@ -10494,6 +10494,23 @@ rs6000_emit_move (rtx dest, rtx source, machine_mode mode)
       gcc_unreachable ();
     }
 
+#ifdef HAVE_AS_GNU_ATTRIBUTE
+  /* If we use a long double type, set the flags in .gnu_attribute that say
+     what the long double type is.  This is to allow the linker's warning
+     message for the wrong long double to be useful, even if the function does
+     not do a call (for example, doing a 128-bit add on power9 if the long
+     double type is IEEE 128-bit.  Do not set this if __ibm128 or __floa128 are
+     used if they aren't the default long dobule type.  */
+  if (rs6000_gnu_attr && (HAVE_LD_PPC_GNU_ATTR_LONG_DOUBLE || TARGET_64BIT))
+    {
+      if (TARGET_LONG_DOUBLE_128 && (mode == TFmode || mode == TCmode))
+	rs6000_passes_float = rs6000_passes_long_double = true;
+
+      else if (!TARGET_LONG_DOUBLE_128 && (mode == DFmode || mode == DCmode))
+	rs6000_passes_float = rs6000_passes_long_double = true;
+    }
+#endif
+
   /* See if we need to special case SImode/SFmode SUBREG moves.  */
   if ((mode == SImode || mode == SFmode) && SUBREG_P (source)
       && rs6000_emit_move_si_sf_subreg (dest, source, mode))

gcc/testsuite/ChangeLog

+2018-01-17  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	* gcc.target/powerpc/gnuattr1.c: New test to make sure we set the
+	appropriate .gnu_attribute for the long double type, if we use the
+	long double type, but do not generate any calls.
+	* gcc.target/powerpc/gnuattr2.c: Likewise.
+	* gcc.target/powerpc/gnuattr3.c: Likewise.
+
 2018-01-17  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/78344

gcc/testsuite/gcc.target/powerpc/gnuattr1.c

+/* { dg-do compile { target { powerpc*-linux-* } } } */
+/* { dg-require-effective-target powerpc_vsx_ok } */
+/* { dg-options "-O2 -mvsx -mlong-double-64" } */
+/* { dg-final { scan-assembler "gnu_attribute 4, 9" } } */
+
+/* Check that if we can do the long double operation without doing an emulator
+   call, such as with 64-bit long double support, that we still set the
+   appropriate .gnu_attribute.  */
+
+long double a;
+
+void add1 (void)
+{
+  a++;
+}

gcc/testsuite/gcc.target/powerpc/gnuattr2.c

+/* { dg-do compile { target { powerpc*-linux-* && lp64 } } } */
+/* { dg-require-effective-target powerpc_p9vector_ok } */
+/* { dg-options "-O2 -mpower9-vector -mabi=ieeelongdouble -Wno-psabi" } */
+/* { dg-final { scan-assembler "gnu_attribute 4, 13" } } */
+
+/* Check that if we can do the long double operation without doing an emulator
+   call, such as with IEEE 128-bit hardware support on power9, that we still
+   set the appropriate .gnu_attribute.  The && lp64 is needed, because we can't
+   enable the IEEE 128-bit hardware instructions on ISA 3.0 (power9) in 32-bit,
+   because we don't have a TImode available.  */
+
+long double a;
+
+void add1 (void)
+{
+  a++;
+}

gcc/testsuite/gcc.target/powerpc/gnuattr3.c

+/* { dg-do compile { target { powerpc*-linux-* } } } */
+/* { dg-require-effective-target powerpc_vsx_ok } */
+/* { dg-options "-O2 -mvsx -mabi=ibmlongdouble -Wno-psabi" } */
+/* { dg-final { scan-assembler "gnu_attribute 4, 5" } } */
+
+/* Check that if we can do the long double operation without doing an emulator
+   call, such as with copysign, that we still set the appropriate
+   .gnu_attribute.  */
+
+long double a, b, c;
+
+void cs (void)
+{
+  a = __builtin_copysignl (b, c);
+}