[PATCH 4] Update usage chain for dead instruction

[Christopher Li <sparse@chrisli.org>]

This patch address some of the dead instruction
left in the usage chain.

Signed-Off-By: Christopher Li <sparse@chrisli.org>

Index: sparse/flow.c
===================================================================
--- sparse.orig/flow.c	2006-12-21 14:35:18.000000000 -0800
+++ sparse/flow.c	2006-12-21 14:35:55.000000000 -0800
@@ -195,6 +195,7 @@ try_to_rewrite_target:
 	if (bb_list_size(target->parents) != 1)
 		return retval;
 	insert_branch(target, insn, final);
+	kill_instruction(insn);
 	return 1;
 }
 
Index: sparse/simplify.c
===================================================================
--- sparse.orig/simplify.c	2006-12-21 14:35:18.000000000 -0800
+++ sparse/simplify.c	2006-12-21 14:35:55.000000000 -0800
@@ -217,6 +217,11 @@ void kill_instruction(struct instruction
 		kill_use(&insn->src2);
 		kill_use(&insn->src3);
 		return;
+	case OP_BR:
+		insn->bb = NULL;
+		repeat_phase |= REPEAT_CSE;
+		if (insn->cond)
+			kill_use(&insn->cond);
 	}
 }