[PATCH] sccvn: Correct the index of bias for IFN_LEN_STORE [PR110744]

[Kewen.Lin via Gcc-patches]

Hi,

Commit r14-2267-gb8806f6ffbe72e adjusts the arguments order
of LEN_STORE from {len,vector,bias} to {len,bias,vector},
in order to make them consistent with LEN_MASK_STORE and
MASK_STORE.  But it missed to update the related handlings
in tree-ssa-sccvn.cc, it caused the failure shown in PR
110744.  This patch is to fix the related handlings with
the correct index.

Bootstrapped and regress-tested on x86_64-redhat-linux,
powerpc64-linux-gnu P8/P9 and powerpc64le-linux-gnu P9/P10.

Is it ok for trunk?

BR,
Kewen
-----
        PR tree-optimization/110744

gcc/ChangeLog:

        * tree-ssa-sccvn.cc (vn_reference_lookup_3): Correct the index of bias
        operand for ifn IFN_LEN_STORE.
---
 gcc/tree-ssa-sccvn.cc | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index 11061a374a2..c0b3ec420c5 100644
--- a/gcc/tree-ssa-sccvn.cc
+++ b/gcc/tree-ssa-sccvn.cc
@@ -3299,11 +3299,14 @@ vn_reference_lookup_3 (ao_ref *ref, tree vuse, void 
*data_,
            return (void *)-1;
          break;
        case IFN_LEN_STORE:
-         len = gimple_call_arg (call, 2);
-         bias = gimple_call_arg (call, 4);
-         if (!tree_fits_uhwi_p (len) || !tree_fits_shwi_p (bias))
-           return (void *)-1;
-         break;
+         {
+           int len_index = internal_fn_len_index (fn);
+           len = gimple_call_arg (call, len_index);
+           bias = gimple_call_arg (call, len_index + 1);
+           if (!tree_fits_uhwi_p (len) || !tree_fits_shwi_p (bias))
+             return (void *) -1;
+           break;
+         }
        default:
          return (void *)-1;
        }
--
2.39.3