[Bug tree-optimization/111970] [14 regression] SLP for non-IFN gathers result in RISC-V test failure on gather since r14-4745-gbeab5b95c58145

[juzhe.zhong at rivai dot ai via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111970

--- Comment #11 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
Hi, Richard.

I come back to revisit this bug.

I found if I do this:

diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index 4a09b3c2aca..2fd128672b9 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -1434,7 +1434,6 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char
*swap,
              && rhs_code != CFN_GATHER_LOAD
              && rhs_code != CFN_MASK_GATHER_LOAD
              && rhs_code != CFN_MASK_LEN_GATHER_LOAD
-             && !STMT_VINFO_GATHER_SCATTER_P (stmt_info)
              /* Not grouped loads are handled as externals for BB
                 vectorization.  For loop vectorization we can handle
                 splats the same we handle single element interleaving.  */


The bug is fixed. But I am not sure whether it is the correct fix.

Reproduce bug compile option on RISC-V:
-O3 --param=riscv-autovec-preference=fixed-vlmax --param riscv-autovec-lmul=m4
-fno-vect-cost-model -ffast-math