diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 00ce4bd434847b63978d9e57c24d9e20efa596c2..d363794c0768596c77ab4251e765ecf01d35d6e7 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2001-02-24 Franz Sirl <Franz.Sirl-kernel@lauterbach.com> + + * loop.c (check_dbra_loop): A biv has uses besides counting if it is + used to set another biv. + Sat Feb 24 06:45:21 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu> * tree.h (BLOCK_DEAD): New macro. diff --git a/gcc/loop.c b/gcc/loop.c index 252e27eb087739e4510fd813c399fe8dca294911..7eb4d0df4502615b6bff8ba228efb6ec18595e0b 100644 --- a/gcc/loop.c +++ b/gcc/loop.c @@ -7259,6 +7259,7 @@ check_dbra_loop (loop, insn_count) if (bl->giv_count == 0 && ! loop->exit_count) { rtx bivreg = regno_reg_rtx[bl->regno]; + struct iv_class *blt; /* If there are no givs for this biv, and the only exit is the fall through at the end of the loop, then @@ -7295,6 +7296,14 @@ check_dbra_loop (loop, insn_count) break; } } + + /* A biv has uses besides counting if it is used to set another biv. */ + for (blt = ivs->list; blt; blt = blt->next) + if (blt->init_set && reg_mentioned_p (bivreg, SET_SRC (blt->init_set))) + { + no_use_except_counting = 0; + break; + } } if (no_use_except_counting)