[PATCH] Regression FIX: Remove vect_variable_length XFAIL from some tests

[Juzhe-Zhong <juzhe.zhong@rivai.ai>]

Hi, this patch fixes these following regression FAILs on RVV:

XPASS: gcc.dg/tree-ssa/pr84512.c scan-tree-dump optimized "return 285;"
XPASS: gcc.dg/vect/bb-slp-43.c -flto -ffat-lto-objects  scan-tree-dump-not slp2 "vector operands from scalars"
XPASS: gcc.dg/vect/bb-slp-43.c scan-tree-dump-not slp2 "vector operands from scalars"
XPASS: gcc.dg/vect/bb-slp-subgroups-3.c -flto -ffat-lto-objects  scan-tree-dump-times slp2 "optimized: basic block" 2
XPASS: gcc.dg/vect/bb-slp-subgroups-3.c scan-tree-dump-times slp2 "optimized: basic block" 2

Since vect_variable_length are available for ARM SVE and RVV, I just use compiler explorer to confirm ARM SVE same as
RVV.

Hi, @Tamar. Could you double check whether this patch fix is reasonable to you ?

And.

Hi, @Richard. Is this patch Ok for trunk if this patch fixes regression for both RVV and ARM SVE.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/pr84512.c: Remove vect_variable_length XFAIL.
	* gcc.dg/vect/bb-slp-43.c: Ditto.
	* gcc.dg/vect/bb-slp-subgroups-3.c: Ditto.

---
 gcc/testsuite/gcc.dg/tree-ssa/pr84512.c        | 2 +-
 gcc/testsuite/gcc.dg/vect/bb-slp-43.c          | 2 +-
 gcc/testsuite/gcc.dg/vect/bb-slp-subgroups-3.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr84512.c b/gcc/testsuite/gcc.dg/tree-ssa/pr84512.c
index 496c78b28dc..3c027012670 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/pr84512.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr84512.c
@@ -13,4 +13,4 @@ int foo()
 }
 
 /* Listed targets xfailed due to PR84958.  */
-/* { dg-final { scan-tree-dump "return 285;" "optimized" { xfail { amdgcn*-*-* || vect_variable_length } } } } */
+/* { dg-final { scan-tree-dump "return 285;" "optimized" { xfail { amdgcn*-*-* } } } } */
diff --git a/gcc/testsuite/gcc.dg/vect/bb-slp-43.c b/gcc/testsuite/gcc.dg/vect/bb-slp-43.c
index dad2d24262d..40bd2e0dfbf 100644
--- a/gcc/testsuite/gcc.dg/vect/bb-slp-43.c
+++ b/gcc/testsuite/gcc.dg/vect/bb-slp-43.c
@@ -14,4 +14,4 @@ f (int *restrict x, short *restrict y)
 }
 
 /* { dg-final { scan-tree-dump-not "mixed mask and nonmask" "slp2" } } */
-/* { dg-final { scan-tree-dump-not "vector operands from scalars" "slp2" { target { { vect_int && vect_bool_cmp } && { vect_unpack && vect_hw_misalign } } xfail { vect_variable_length && { ! vect256 } } } } } */
+/* { dg-final { scan-tree-dump-not "vector operands from scalars" "slp2" { target { { vect_int && vect_bool_cmp } && { vect_unpack && vect_hw_misalign } } } } } */
diff --git a/gcc/testsuite/gcc.dg/vect/bb-slp-subgroups-3.c b/gcc/testsuite/gcc.dg/vect/bb-slp-subgroups-3.c
index fb719915db7..3f0d45ce4a1 100644
--- a/gcc/testsuite/gcc.dg/vect/bb-slp-subgroups-3.c
+++ b/gcc/testsuite/gcc.dg/vect/bb-slp-subgroups-3.c
@@ -42,7 +42,7 @@ main (int argc, char **argv)
 /* Because we disable the cost model, targets with variable-length
    vectors can end up vectorizing the store to a[0..7] on its own.
    With the cost model we do something sensible.  */
-/* { dg-final { scan-tree-dump-times "optimized: basic block" 2 "slp2" { target { ! amdgcn-*-* } xfail vect_variable_length } } } */
+/* { dg-final { scan-tree-dump-times "optimized: basic block" 2 "slp2" { target { ! amdgcn-*-* } } } } */
 
 /* amdgcn can do this in one vector.  */
 /* { dg-final { scan-tree-dump-times "optimized: basic block" 1 "slp2" { target amdgcn-*-* } } } */
-- 
2.36.3