diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 430e62bc6cb97df5047262b2ca116539ac912305..5e40c62f8a7f7ecc460ebbd134e6bc581172f672 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Mon Sep 6 02:42:36 1999 Jeffrey A Law (law@cygnus.com) + + * cse.c (delete_trivially_dead_insns): Do not skip the last + insn if it is a real insn. + Sun Sep 5 18:57:42 1999 Mark Mitchell <mark@codesourcery.com> * Makefile.in (ggc-simple.o): Depend on hash.h. diff --git a/gcc/cse.c b/gcc/cse.c index 68fe7b04a9240855cb7fff5dbaa000d016c2a397..d1a2487cb41061fa5d5aef876fa4f7f7ad4e2ea2 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;