From: Kewen Lin <linkw@linux.ibm.com>
Date: Fri, 21 Jul 2023 05:18:19 +0000 (-0500)
Subject: sccvn: Correct the index of bias for IFN_LEN_STORE [PR110744]
X-Git-Tag: basepoints/gcc-15~7445
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6654c08fde11890d621fa7831180d410054568a;p=thirdparty%2Fgcc.git

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

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.

	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.
---

diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index a0b98c18ac8a..ebe8006bb8b0 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;
 	}