From 8d71a51026ad5ce87d51be1915a2eb2ae88f9cd8 Mon Sep 17 00:00:00 2001 From: Jeffrey A Law Date: Mon, 6 Sep 1999 08:44:50 +0000 Subject: cse.c (delete_trivially_dead_insns): Do not skip the last insn if it is a real insn. * cse.c (delete_trivially_dead_insns): Do not skip the last insn if it is a real insn. From-SVN: r29138 --- gcc/cse.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'gcc/cse.c') diff --git a/gcc/cse.c b/gcc/cse.c index 68fe7b0..d1a2487 100644 --- a/gcc/cse.c +++ b/gcc/cse.c @@ -9135,8 +9135,16 @@ delete_trivially_dead_insns (insns, nreg) /* Go from the last insn to the first and delete insns that only set unused registers or copy a register to itself. As we delete an insn, remove - usage counts for registers it uses. */ - for (insn = prev_real_insn (get_last_insn ()); insn; insn = prev) + usage counts for registers it uses. + + The first jump optimization pass may leave a real insn as the last + insn in the function. We must not skip that insn or we may end + up deleting code that is not really dead. */ + insn = get_last_insn (); + if (GET_RTX_CLASS (GET_CODE (insn)) != 'i') + insn = prev_real_insn (insn); + + for ( ; insn; insn = prev) { int live_insn = 0; rtx note; -- cgit v1.1