PR 49809: write data refs can now be calls

[Richard Sandiford]

PR 49809 is fallout from my patch to add write data references for the
lhs of calls.  tree-ssa-phiopt.c was still assuming that writes were
always assignments.

I tried to look for other examples of the same thing, but couldn't
find any.

Tested on x86_64-linux-gnu (all,ada).  OK to install?

Richard


gcc/
        PR tree-optimization/49809
        * tree-ssa-phiopt.c (cond_if_else_store_replacement): Use
        gimple_get_lhs instead of gimple_assign_lhs.

Index: gcc/tree-ssa-phiopt.c
===================================================================
--- gcc/tree-ssa-phiopt.c       2011-07-21 11:10:34.000000000 +0100
+++ gcc/tree-ssa-phiopt.c       2011-07-25 14:32:36.000000000 +0100
@@ -1454,7 +1454,7 @@ cond_if_else_store_replacement (basic_bl
         continue;
 
       then_store = DR_STMT (then_dr);
-      then_lhs = gimple_assign_lhs (then_store);
+      then_lhs = gimple_get_lhs (then_store);
       found = false;
 
       FOR_EACH_VEC_ELT (data_reference_p, else_datarefs, j, else_dr)
@@ -1463,7 +1463,7 @@ cond_if_else_store_replacement (basic_bl
             continue;
 
           else_store = DR_STMT (else_dr);
-          else_lhs = gimple_assign_lhs (else_store);
+          else_lhs = gimple_get_lhs (else_store);
 
           if (operand_equal_p (then_lhs, else_lhs, 0))
             {