Allow more complex call replacements in gimple-fold.c

[Richard Sandiford <rdsandiford@googlemail.com>]

An upcoming patch adds a match.pd rule that folds pow(pow(x,y),z)
to pow(x,y*z).  This fold can reuse the existing pow gimple statement
and simply replace the operands with x and y*z.  However, the y*z
itself requires a separate gimple statement and the code wasn't
prepared to handle that.

Tested on x86_64-linux-gnu, aarch64-linux-gnu and arm-linux-gnueabi.
OK to install?

Thanks,
Richard


gcc/
	* gimple-fold.c (replace_stmt_with_simplification): Allow calls
	to have nonempty sequences.

diff --git a/gcc/gimple-fold.c b/gcc/gimple-fold.c
index 1869c09..4b9b782 100644
--- a/gcc/gimple-fold.c
+++ b/gcc/gimple-fold.c
@@ -3365,7 +3365,14 @@ replace_stmt_with_simplification (gimple_stmt_iterator *gsi,
 	}
       if (i < 3)
 	gcc_assert (ops[i] == NULL_TREE);
-      gcc_assert (gimple_seq_empty_p (*seq));
+      if (dump_file && (dump_flags & TDF_DETAILS))
+	{
+	  fprintf (dump_file, "gimple_simplified to ");
+	  if (!gimple_seq_empty_p (*seq))
+	    print_gimple_seq (dump_file, *seq, 0, TDF_SLIM);
+	  print_gimple_stmt (dump_file, gsi_stmt (*gsi), 0, TDF_SLIM);
+	}
+      gsi_insert_seq_before (gsi, *seq, GSI_SAME_STMT);
       return true;
     }
   else if (!inplace)