Re: [PATCH] testsuite: Adjust possibly fragile slp-perm-9.c [PR104015]

["Kewen.Lin" <linkw@linux.ibm.com>]

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on 2022/1/18 上午11:06, Kewen.Lin via Gcc-patches wrote:
> Hi,
> 
> As discussed in PR104015, the test case slp-perm-9.c can be
> fragile when vectorizer tries to use different vectorisation
> strategies.
> 
> As Richard suggested, this patch tries to make the check not
> sensitive on the re-trying times by removing the times checking.
> To still retain the test coverage on unnecessary re-trying, for
> example this exposed PR104015 on Power9, I added two test cases
> to powerpc test bucket.
> 
> Tested on x86_64-redhat-linux, aarch64-linux-gnu and
> powerpc64-linux-gnu Power8 and powerpc64le-linux-gnu
> Power9/Power10.
> 
> Is it ok for trunk?
> 
> BR,
> Kewen
> -----
> gcc/testsuite/ChangeLog:
> 
> 	PR tree-optimization/104015
> 	* gcc.dg/vect/slp-perm-9.c: Adjust.
> 	* gcc.target/powerpc/pr104015-1.c: New test.
> 	* gcc.target/powerpc/pr104015-2.c: New test.

One updated version is attached to modify pr104015-2.c slightly by
using more clear required effective target lp64.

Tested as before.

BR,
Kewen

[-- Attachment #2: pr104015-test-v2.patch --]
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 gcc/testsuite/gcc.dg/vect/slp-perm-9.c        |  4 +--
 gcc/testsuite/gcc.target/powerpc/pr104015-1.c | 28 ++++++++++++++++++
 gcc/testsuite/gcc.target/powerpc/pr104015-2.c | 29 +++++++++++++++++++
 3 files changed, 58 insertions(+), 3 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/powerpc/pr104015-1.c
 create mode 100644 gcc/testsuite/gcc.target/powerpc/pr104015-2.c

diff --git a/gcc/testsuite/gcc.dg/vect/slp-perm-9.c b/gcc/testsuite/gcc.dg/vect/slp-perm-9.c
index 873eddf223e..154c00af598 100644
--- a/gcc/testsuite/gcc.dg/vect/slp-perm-9.c
+++ b/gcc/testsuite/gcc.dg/vect/slp-perm-9.c
@@ -61,9 +61,7 @@ int main (int argc, const char* argv[])
 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target { { vect_perm_short || vect32 } || vect_load_lanes } } } } */
 /* We don't try permutes with a group size of 3 for variable-length
    vectors.  */
-/* { dg-final { scan-tree-dump-times "permutation requires at least three vectors" 1 "vect" { target { vect_perm_short && { { ! vect_perm3_short } && { ! vect_partial_vectors_usage_1 } } } xfail vect_variable_length } } } */
-/* Try to vectorize the epilogue using partial vectors.  */
-/* { dg-final { scan-tree-dump-times "permutation requires at least three vectors" 2 "vect" { target { vect_perm_short && { { ! vect_perm3_short } && vect_partial_vectors_usage_1 } } xfail vect_variable_length } } } */
+/* { dg-final { scan-tree-dump "permutation requires at least three vectors" "vect" { target { vect_perm_short && { ! vect_perm3_short } } xfail vect_variable_length } } } */
 /* { dg-final { scan-tree-dump-not "permutation requires at least three vectors" "vect" { target vect_perm3_short } } } */
 /* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 0 "vect" { target { { ! { vect_perm3_short || vect32 } } || vect_load_lanes } } } } */
 /* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 1 "vect" { target { { vect_perm3_short || vect32 } && { ! vect_load_lanes } } } } } */
diff --git a/gcc/testsuite/gcc.target/powerpc/pr104015-1.c b/gcc/testsuite/gcc.target/powerpc/pr104015-1.c
new file mode 100644
index 00000000000..895c243aaf8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr104015-1.c
@@ -0,0 +1,28 @@
+/* { dg-require-effective-target powerpc_p9vector_ok } */
+/* { dg-options "-mdejagnu-cpu=power9 -O2 -ftree-vectorize -fno-vect-cost-model -fdump-tree-vect-details" } */
+
+/* As PR104015, we don't expect vectorizer will re-try some vector modes
+   for epilogues on Power9, since Power9 doesn't support partial vector
+   by defaut.  */
+
+#include <stdarg.h>
+#define N 200
+
+void __attribute__((noinline))
+foo (unsigned short *__restrict__ pInput, unsigned short *__restrict__ pOutput)
+{
+  unsigned short i, a, b, c;
+
+  for (i = 0; i < N / 3; i++)
+    {
+       a = *pInput++;
+       b = *pInput++;
+       c = *pInput++;
+
+       *pOutput++ = a + b + c + 3;
+       *pOutput++ = a + b + c + 12;
+       *pOutput++ = a + b + c + 1;
+    }
+}
+
+/* { dg-final { scan-tree-dump-not "Re-trying epilogue analysis with vector mode" "vect" } } */
diff --git a/gcc/testsuite/gcc.target/powerpc/pr104015-2.c b/gcc/testsuite/gcc.target/powerpc/pr104015-2.c
new file mode 100644
index 00000000000..ab482b11629
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr104015-2.c
@@ -0,0 +1,29 @@
+/* { dg-require-effective-target power10_ok } */
+/* Vector with length instructions lxvl/stxvl are only enabled for 64 bit.  */
+/* { dg-require-effective-target lp64 } */
+/* { dg-options "-mdejagnu-cpu=power10 -O2 -ftree-vectorize -fno-vect-cost-model -fdump-tree-vect-details" } */
+
+/* Power10 support partial vector for epilogue by default, it's expected
+   vectorizer would re-try for it once.  */
+
+#include <stdarg.h>
+#define N 200
+
+void __attribute__((noinline))
+foo (unsigned short *__restrict__ pInput, unsigned short *__restrict__ pOutput)
+{
+  unsigned short i, a, b, c;
+
+  for (i = 0; i < N / 3; i++)
+    {
+       a = *pInput++;
+       b = *pInput++;
+       c = *pInput++;
+
+       *pOutput++ = a + b + c + 3;
+       *pOutput++ = a + b + c + 12;
+       *pOutput++ = a + b + c + 1;
+    }
+}
+
+/* { dg-final { scan-tree-dump-times "Re-trying epilogue analysis with vector mode" 1 "vect" } } */