loop-iv: Fix typo in `iv_analyze_expr' description

	gcc/
	* loop-iv.c: Fix a typo, s/bu/by/, in the `iv_analyze_expr'
	description in the introduction.

diff --git a/gcc/loop-iv.c b/gcc/loop-iv.c
index d7b3d90f047448f2976bdb0f0c6dde7d62b35467..9f266e2a43c58855535d0544533b5fe5f2ef1ded 100644 (file)
--- a/gcc/loop-iv.c
+++ b/gcc/loop-iv.c
@@ -44,7 +44,7 @@ along with GCC; see the file COPYING3.  If not see
    iv_analyze_result (insn, def, iv):  Stores to IV the description of the iv
      corresponding to DEF, which is a register defined in INSN.
    iv_analyze_expr (insn, mode, expr, iv):  Stores to IV the description of iv
-     corresponding to expression EXPR evaluated at INSN.  All registers used bu
+     corresponding to expression EXPR evaluated at INSN.  All registers used by
      EXPR must also be used in INSN.  MODE is the mode of EXPR.
 */