amd64: Add peephole pass.

ir/be/amd64/amd64_optimize.c

+/*
+ * This file is part of libFirm.
+ * Copyright (C) 2016 University of Karlsruhe.
+ */
+
+/**
+ * @file
+ * @brief  Peephole optimizations.
+ */
+#include "amd64_optimize.h"
+
+#include "bepeephole.h"
+
+void amd64_peephole_optimization(ir_graph *const irg)
+{
+	ir_clear_opcodes_generic_func();
+	be_peephole_opt(irg);
+}

ir/be/amd64/amd64_optimize.h

+/*
+ * This file is part of libFirm.
+ * Copyright (C) 2016 University of Karlsruhe.
+ */
+
+/**
+ * @file
+ * @brief  Peephole optimizations.
+ */
+#ifndef FIRM_BE_AMD64_AMD64_OPTIMIZE_H
+#define FIRM_BE_AMD64_AMD64_OPTIMIZE_H
+
+#include "firm_types.h"
+
+/**
+ * Perform peephole optimizations an a graph.
+ *
+ * @param irg  the graph
+ */
+void amd64_peephole_optimization(ir_graph *irg);
+
+#endif

ir/be/amd64/bearch_amd64.c

@@ -10,6 +10,7 @@
 #include "amd64_emitter.h"
 #include "amd64_finish.h"
 #include "amd64_new_nodes.h"
+#include "amd64_optimize.h"
 #include "amd64_transform.h"
 #include "amd64_varargs.h"
 #include "bearch_amd64_t.h"
@@ -639,6 +640,8 @@ static void amd64_finish_and_emit(ir_graph *irg)
 
 	amd64_simulate_graph_x87(irg);
 
+	amd64_peephole_optimization(irg);
+
 	/* emit code */
 	be_timer_push(T_EMIT);
 	amd64_emit_function(irg);