[PATCH] Fix passing double float complex arguments in sparc64

[jose.marchesi@oracle.com (Jose E. Marchesi)]

Hi.

Double float complex objects are not 16-byte aligned in either gcc or
solaris studio.  This patch makes gdb to not align double float complex
arguments in the dummy frame when calling a function.

This makes all the tests in gdb.base/varargs.exp to pass in
sparc64-*-linux-gnu.

2013-10-15  Jose E. Marchesi  <jose.marchesi@oracle.com>

        * sparc64-tdep.c (sparc64_store_arguments): Do not align complex
        double float arguments to 16-byte.

Index: sparc64-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/sparc64-tdep.c,v
retrieving revision 1.62
diff -u -r1.62 sparc64-tdep.c
--- sparc64-tdep.c	1 Jan 2013 06:32:51 -0000	1.62
+++ sparc64-tdep.c	15 Oct 2013 15:46:25 -0000
@@ -831,7 +831,7 @@
                  quad-aligned, and thus a hole might be introduced
                  into the parameter array to force alignment."  Skip
                  an element if necessary.  */
-	      if (num_elements % 2)
+	      if ((num_elements % 2) && sparc64_16_byte_align_p (type))
 		num_elements++;
 	    }
 	  else
@@ -913,7 +913,7 @@
 	  /* Floating arguments.  */
 	  if (len == 16)
 	    {
-	      if (element % 2)
+	      if ((element % 2) && sparc64_16_byte_align_p (type))
 		element++;
 	      if (element < 16)
 		regnum = SPARC64_Q0_REGNUM + element / 2;
@@ -961,7 +961,7 @@
 	    }
 	  else if (regnum >= SPARC64_Q0_REGNUM && regnum <= SPARC64_Q8_REGNUM)
 	    {
-	      gdb_assert (element < 5);
+	      gdb_assert (element < 6);
 	      regnum = SPARC_O0_REGNUM + element;
 	      regcache_cooked_write (regcache, regnum, valbuf);
 	      regcache_cooked_write (regcache, regnum + 1, valbuf + 8);