[PATCH][testsuite] Add check_effective_target_autoincdec

[Wilco Dijkstra]

Richard Earnshaw wrote:
> Except that I think this would be better done as an 'effective target'
> test; something like
>
> dg-require-effective-target autoincdec

Right I figured out how to do this - not trivial as it needs a secret flag in 
the
glob call - if anyone knows a better way of doing this I'd like to know!


Add check_effective_target_autoincdec that returns true if a target
runs the auto_inc_dec optimization pass.

OK for commit?

ChangeLog:
2017-08-08  Wilco Dijkstra  <wdijk...@arm.com>

gcc/testsuite/

        * gcc.dg/pr46932.c: Use effective_target autoincdec.
        * lib/target-supports.exp: Add check_effective_target_autoincdec.
--

diff --git a/gcc/testsuite/gcc.dg/pr46932.c b/gcc/testsuite/gcc.dg/pr46932.c
index 
4eb1a99e1bd9403f8b1c5d0d71ef731ad4a65128..2b39990d036035d22e226b98351a4900a5dbb309
 100644
--- a/gcc/testsuite/gcc.dg/pr46932.c
+++ b/gcc/testsuite/gcc.dg/pr46932.c
@@ -1,7 +1,5 @@
 /* { dg-options "-O2 -fdump-rtl-auto_inc_dec" } */
-
-/* Build on targets which have pre increment.  */
-/* { dg-do compile { target aarch64*-*-* arm*-*-* rs6000-*-* powerpc*-*-* 
arc*-*-* m32r-*-* tic6x-*-* } } */
+/* { dg-require-effective-target autoincdec } */
 
 /* Check that accesses based on the frame pointer do not
    use auto increment.  */
diff --git a/gcc/testsuite/lib/target-supports.exp 
b/gcc/testsuite/lib/target-supports.exp
index 
5a6562794b2bdd5f370fc5b26d6887777f02779a..5219fbf4671e83a6fa7affdab926115e8a23f9cb
 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -8482,3 +8482,18 @@ proc check_effective_target_arm_coproc4_ok { } {
     return [check_cached_effective_target arm_coproc4_ok \
                check_effective_target_arm_coproc4_ok_nocache]
 }
+
+# Return 1 if the target supports the auto_inc_dec optimization pass.
+proc check_effective_target_autoincdec { } {
+    if { ![check_no_compiler_messages auto_incdec assembly { void f () { }
+        } "-O2 -fdump-rtl-auto_inc_dec" ] } {
+      return 0
+    }
+
+    set dumpfile [glob -nocomplain 
"auto_incdec[pid].c.\[0-9\]\[0-9\]\[0-9\]r.auto_inc_dec"]
+    if { [file exists $dumpfile ] } {
+       file delete $dumpfile
+       return 1
+    }
+    return 0
+}