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.
---
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 | 28 +++++++++++++++++++
3 files changed, 57 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..1b66a64f47c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr104015-2.c
@@ -0,0 +1,28 @@
+/* { dg-require-effective-target power10_ok } */
+/* { 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;
+ }
+}
+
+/* Vector with length instructions lxvl/stxvl are only enabled for 64 bit. */
+/* { dg-final { scan-tree-dump-times "Re-trying epilogue analysis with vector
mode" 1 "vect" {target { ! ilp32 } } } } */
