x86 testsuite fixes for -march= multilib testing

["Joseph S. Myers" <joseph at codesourcery dot com>]

This patch fixes various x86 testcases for issues running the testsuite
with -march= multilib options.  (Recall that multilib options passed
when running the testsuite come *after* those in dg-options.)

* gcc.target/i386/isa-9.c and gcc.target/i386/pr42589.c have -march
  options in dg-options and should be skipped if other -march options
  are in the multilib options, similarly to how other tests with this
  issue are skipped.

* gcc.target/i386/sse-19.c tests for a particular assembler
  instruction with -msse2; this instruction doesn't appear if your
  -march option (or one configured with --with-arch, presumably)
  enables SSSE3.  Fixed by adding an explicit -march option (I chose
  -march=x86-64) and skipping for other -march values.

* gcc.dg/march-generic.c (which is an x86-specific test despite not
  being in gcc.target) tests for an error for -march=generic which
  does not appear if another, valid -march option follows.  In this
  case, arguably there *should* be an error.  But since the test
  gcc.dg/march.c (testing for a -march=foo error) is already skipped
  for -march in multilib options, I think it is reasonable to skip
  march-generic.c as well.  If any of my options changes result in
  such errors being given sooner, so they apply even for overridden
  -march options, then at that point those skips can be removed.

OK to commit?

2010-10-22  Joseph Myers  <joseph@codesourcery.com>

	* gcc.dg/march-generic.c: Skip for -march in multilib options.
	* gcc.target/i386/isa-9.c: Skip for -march other than
	-march=amdfam10 in multilib options.
	* gcc.target/i386/pr42589.c: Skip for -march other than
	-march=i486 in multilib options.
	* gcc.target/i386/sse-19.c: Add -march=x86-64 option and skip for
	other -march in multilib options.

Index: gcc/testsuite/gcc.target/i386/sse-19.c
===================================================================
--- gcc/testsuite/gcc.target/i386/sse-19.c	(revision 165855)
+++ gcc/testsuite/gcc.target/i386/sse-19.c	(working copy)
@@ -1,5 +1,6 @@
 /* { dg-do compile } */
-/* { dg-options "-O3 -msse2" } */
+/* { dg-skip-if "" { i?86-*-* x86_64-*-* } { "-march=*" } { "-march=x86-64" } } */
+/* { dg-options "-O3 -march=x86-64 -msse2" } */
 /* { dg-final { scan-assembler "punpcklbw" } } */
 extern void abort();
 #include <emmintrin.h>
Index: gcc/testsuite/gcc.target/i386/isa-9.c
===================================================================
--- gcc/testsuite/gcc.target/i386/isa-9.c	(revision 165855)
+++ gcc/testsuite/gcc.target/i386/isa-9.c	(working copy)
@@ -1,4 +1,5 @@
 /* { dg-do run } */
+/* { dg-skip-if "" { i?86-*-* x86_64-*-* } { "-march=*" } { "-march=amdfam10" } } */
 /* { dg-options "-march=amdfam10 -mno-fma4" } */
 
 extern void abort (void);
Index: gcc/testsuite/gcc.target/i386/pr42589.c
===================================================================
--- gcc/testsuite/gcc.target/i386/pr42589.c	(revision 165855)
+++ gcc/testsuite/gcc.target/i386/pr42589.c	(working copy)
@@ -1,5 +1,6 @@
 /* { dg-do compile } */
 /* { dg-require-effective-target ilp32 } */
+/* { dg-skip-if "" { i?86-*-* x86_64-*-* } { "-march=*" } { "-march=i486" } } */
 /* { dg-options "-O2 -march=i486" } */
 
 void
Index: gcc/testsuite/gcc.dg/march-generic.c
===================================================================
--- gcc/testsuite/gcc.dg/march-generic.c	(revision 165855)
+++ gcc/testsuite/gcc.dg/march-generic.c	(working copy)
@@ -1,4 +1,5 @@
 /* { dg-do compile { target i?86-*-* } } */
+/* { dg-skip-if "" { *-*-* } { "-march=*" } { "" } } */
 /* { dg-options "-march=generic" } */
 /* { dg-error "generic CPU can be used only for -mtune" "" { target *-*-* } 0 } */
 /* { dg-bogus "march" "" { target *-*-* } 0 } */

-- 
Joseph S. Myers
joseph@codesourcery.com