re PR target/71493 (accidental ABI change for structure return on PowerPC)

[gcc]
2016-07-18  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/71493
	* config/rs6000/rs6000.c (rs6000_function_value): Fix
	unintentional System V.4 structure return breakage for structures
	with a single floating point element.

[gcc/testsuite]
2016-07-18  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/71493
	* gcc.target/powerpc/pr71493-1.c: New test.
	* gcc.target/powerpc/pr71493-2.c: Likewise.

From-SVN: r238454

gcc/ChangeLog

+2016-07-18  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	PR target/71493
+	* config/rs6000/rs6000.c (rs6000_function_value): Fix
+	unintentional System V.4 structure return breakage for structures
+	with a single floating point element.
+
 2016-07-18  Yuri Rumyantsev  <ysrumyan@gmail.com>
 
 	PR tree-optimization/71734

gcc/config/rs6000/rs6000.c

@@ -35467,7 +35467,8 @@ rs6000_function_value (const_tree valtype,
   if (DECIMAL_FLOAT_MODE_P (mode) && TARGET_HARD_FLOAT && TARGET_FPRS)
     /* _Decimal128 must use an even/odd register pair.  */
     regno = (mode == TDmode) ? FP_ARG_RETURN + 1 : FP_ARG_RETURN;
-  else if (SCALAR_FLOAT_MODE_NOT_VECTOR_P (mode) && TARGET_HARD_FLOAT && TARGET_FPRS
+  else if (SCALAR_FLOAT_TYPE_P (valtype) && TARGET_HARD_FLOAT && TARGET_FPRS
+	   && !FLOAT128_VECTOR_P (mode)
 	   && ((TARGET_SINGLE_FLOAT && (mode == SFmode)) || TARGET_DOUBLE_FLOAT))
     regno = FP_ARG_RETURN;
   else if (TREE_CODE (valtype) == COMPLEX_TYPE

gcc/testsuite/ChangeLog

+2016-07-18  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	PR target/71493
+	* gcc.target/powerpc/pr71493-1.c: New test.
+	* gcc.target/powerpc/pr71493-2.c: Likewise.
+
 2016-07-18  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/71835

gcc/testsuite/gcc.target/powerpc/pr71493-1.c

+/* { dg-do compile { target { powerpc*-*-linux* && ilp32 } } } */
+/* { dg-options "-O2 -msvr4-struct-return" } */
+
+struct S1 { float f; };
+
+struct S1 foo1 (void)
+{
+  struct S1 s = { 1.0f };
+  return s;
+}
+
+/* { dg-final { scan-assembler     "lwz" } } */
+/* { dg-final { scan-assembler-not "lfs" } } */

gcc/testsuite/gcc.target/powerpc/pr71493-2.c

+/* { dg-do compile { target { powerpc*-*-linux* && ilp32 } } } */
+/* { dg-options "-O2 -msvr4-struct-return" } */
+
+struct S2 { double d; };
+
+struct S2 foo2 (void)
+{
+  struct S2 s = { 1.0 };
+  return s;
+}
+
+/* { dg-final { scan-assembler     "lwz" } } */
+/* { dg-final { scan-assembler-not "lfd" } } */