X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Flower%2Flower_intrinsics.c;h=a185916e5e1715ec74e686c26eca2f32a3dc947c;hb=dcab4eede6167fbdecdeeaa7b2194bfaf7290c59;hp=555a739919e16f94373504dc00fdf7f3b5aac2bc;hpb=a41668acc1195182f1dbc50a1032ebb96a53a38b;p=libfirm

diff --git a/ir/lower/lower_intrinsics.c b/ir/lower/lower_intrinsics.c
index 555a73991..a185916e5 100644
--- a/ir/lower/lower_intrinsics.c
+++ b/ir/lower/lower_intrinsics.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 1995-2007 University of Karlsruhe.  All right reserved.
+ * Copyright (C) 1995-2011 University of Karlsruhe.  All right reserved.
  *
  * This file is part of libFirm.
  *
@@ -23,10 +23,9 @@
  * @author  Michael Beck
  * @version $Id$
  */
-
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif
+
+#include <stdbool.h>
 
 #include "lowering.h"
 #include "irop_t.h"
@@ -38,22 +37,27 @@
 #include "irgmod.h"
 #include "irgopt.h"
 #include "trouts.h"
+#include "irverify.h"
 #include "pmap.h"
-#include "xmalloc.h"
+#include "array_t.h"
+#include "irpass_t.h"
 #include "iropt_dbg.h"
+#include "error.h"
+#include "be.h"
 
-/** Walker environment */
-typedef struct _walker_env {
+/** Walker environment. */
+typedef struct walker_env {
 	pmap     *c_map;              /**< The intrinsic call map. */
-	unsigned nr_of_intrinsics;    /**< statistics */
+	size_t   nr_of_intrinsics;    /**< statistics */
 	i_instr_record **i_map;       /**< The intrinsic instruction map. */
 } walker_env_t;
 
 /**
  * walker: call all mapper functions
  */
-static void call_mapper(ir_node *node, void *env) {
-	walker_env_t *wenv = env;
+static void call_mapper(ir_node *node, void *env)
+{
+	walker_env_t *wenv = (walker_env_t*)env;
 	ir_op *op = get_irn_op(node);
 
 	if (op == op_Call) {
@@ -63,15 +67,14 @@ static void call_mapper(ir_node *node, void *env) {
 		ir_entity *ent;
 
 		symconst = get_Call_ptr(node);
-		if (get_irn_op(symconst) != op_SymConst ||
-			get_SymConst_kind(symconst) != symconst_addr_ent)
+		if (! is_Global(symconst))
 			return;
 
-		ent = get_SymConst_entity(symconst);
+		ent = get_Global_entity(symconst);
 		p   = pmap_find(wenv->c_map, ent);
 
 		if (p) {
-			r = p->value;
+			r = (const i_call_record*)p->value;
 			wenv->nr_of_intrinsics += r->i_mapper(node, r->ctx) ? 1 : 0;
 		}
 	} else {
@@ -83,27 +86,29 @@ static void call_mapper(ir_node *node, void *env) {
 					++wenv->nr_of_intrinsics;
 					break;
 				}
-				r = r->link;
+				r = (const i_instr_record*)r->link;
 			}
 		}
 	}
 }  /* call_mapper */
 
 /* Go through all graphs and map calls to intrinsic functions. */
-unsigned lower_intrinsics(i_record *list, int length, int part_block_used) {
-	int            i, n_ops = get_irp_n_opcodes();
+size_t lower_intrinsics(i_record *list, size_t length, int part_block_used)
+{
+	size_t         i, n;
+	size_t         n_ops = get_irp_n_opcodes();
 	ir_graph       *irg;
 	pmap           *c_map = pmap_create_ex(length);
 	i_instr_record **i_map;
-	unsigned       nr_of_intrinsics = 0;
+	size_t         nr_of_intrinsics = 0;
 	walker_env_t   wenv;
 
 	/* we use the ir_op generic pointers here */
-	NEW_ARR_A(const i_instr_record *, i_map, n_ops);
+	NEW_ARR_A(i_instr_record *, i_map, n_ops);
 	memset((void *)i_map, 0, sizeof(*i_map) * n_ops);
 
 	/* fill a map for faster search */
-	for (i = length - 1; i >= 0; --i) {
+	for (i = 0; i < length; ++i) {
 		if (list[i].i_call.kind == INTRINSIC_CALL) {
 			pmap_insert(c_map, list[i].i_call.i_ent, (void *)&list[i].i_call);
 		} else {
@@ -118,30 +123,30 @@ unsigned lower_intrinsics(i_record *list, int length, int part_block_used) {
 	wenv.c_map = c_map;
 	wenv.i_map = i_map;
 
-	for (i = get_irp_n_irgs() - 1; i >= 0; --i) {
+	for (i = 0, n = get_irp_n_irgs(); i < n; ++i) {
 		irg = get_irp_irg(i);
 
-		if (part_block_used)
+		if (part_block_used) {
+			ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK | IR_RESOURCE_PHI_LIST);
 			collect_phiprojs(irg);
+		}
 
 		wenv.nr_of_intrinsics = 0;
 		irg_walk_graph(irg, NULL, call_mapper, &wenv);
 
-		if (wenv.nr_of_intrinsics) {
-			/* changes detected */
-			set_irg_outs_inconsistent(irg);
-			set_irg_callee_info_state(irg, irg_callee_info_inconsistent);
+		if (part_block_used)
+			ir_free_resources(irg, IR_RESOURCE_IRN_LINK | IR_RESOURCE_PHI_LIST);
 
-			/* exception control flow might have changed */
-			set_irg_doms_inconsistent(irg);
-			set_irg_extblk_inconsistent(irg);
-			set_irg_loopinfo_inconsistent(irg);
+		if (wenv.nr_of_intrinsics > 0) {
+			/* Changes detected: we might have added/removed nodes. */
+			set_irg_callee_info_state(irg, irg_callee_info_inconsistent);
 
-			/* calls might be removed/added */
-			set_trouts_inconsistent();
+			/* Exception control flow might have changed / new block might have added. */
+			clear_irg_state(irg, IR_GRAPH_STATE_CONSISTENT_DOMINANCE
+			                   | IR_GRAPH_STATE_VALID_EXTENDED_BLOCKS);
 
-			/* optimize it, tuple might be created */
-			local_optimize_graph(irg);
+			/* verify here */
+			irg_verify(irg, VERIFY_NORMAL);
 
 			nr_of_intrinsics += wenv.nr_of_intrinsics;
 		}
@@ -151,6 +156,47 @@ unsigned lower_intrinsics(i_record *list, int length, int part_block_used) {
 	return nr_of_intrinsics;
 }  /* lower_intrinsics */
 
+typedef struct pass_t {
+	ir_prog_pass_t pass;
+
+	int      part_block_used;
+	size_t   length;
+	i_record list[1];
+} pass_t;
+
+/**
+ * Wrapper for running lower_intrinsics() as an ir_prog pass.
+ */
+static int pass_wrapper(ir_prog *irp, void *context)
+{
+	pass_t *pass = (pass_t*)context;
+	(void) irp; /* TODO: set current irp, or remove parameter */
+	lower_intrinsics(pass->list, pass->length, pass->part_block_used);
+	/* probably this pass should not run again */
+	return 0;
+}
+
+/**
+ * Creates an ir_prog pass for lower_intrinsics.
+ *
+ * @param name             the name of this pass or NULL
+ * @param list             an array of intrinsic map records
+ * @param length           the length of the array
+ * @param part_block_used  set to true if part_block() must be using during lowering
+ */
+ir_prog_pass_t *lower_intrinsics_pass(
+	const char *name,
+	i_record *list, size_t length, int part_block_used)
+{
+	pass_t *const pass = XMALLOCF(pass_t, list, length);
+	memcpy(pass->list, list, sizeof(list[0]) * length);
+	pass->length          = length;
+	pass->part_block_used = part_block_used;
+
+	return def_prog_pass_constructor(
+		&pass->pass, name ? name : "lower_intrinsics", pass_wrapper);
+}  /* lower_intrinsics_pass*/
+
 /**
  * Helper function, replace the call by the given node.
  *
@@ -160,45 +206,83 @@ unsigned lower_intrinsics(i_record *list, int length, int part_block_used) {
  * @param reg_jmp  new regular control flow, if NULL, a Jmp will be used
  * @param exc_jmp  new exception control flow, if reg_jmp == NULL, a Bad will be used
  */
-static void replace_call(ir_node *irn, ir_node *call, ir_node *mem, ir_node *reg_jmp, ir_node *exc_jmp) {
-	if (reg_jmp == NULL) {
-		ir_node *block = get_nodes_block(call);
-
-		/* Beware: do we need here a protection against CSE? Better we do it. */
-		int old_cse = get_opt_cse();
-		set_opt_cse(0);
-		reg_jmp = new_r_Jmp(current_ir_graph, block);
-		set_opt_cse(old_cse);
-		exc_jmp = new_Bad();
-	}
-	irn = new_Tuple(1, &irn);
-
-	turn_into_tuple(call, pn_Call_max);
-	set_Tuple_pred(call, pn_Call_M_regular, mem);
-	set_Tuple_pred(call, pn_Call_X_regular, reg_jmp);
-	set_Tuple_pred(call, pn_Call_X_except, exc_jmp);
-	set_Tuple_pred(call, pn_Call_T_result, irn);
-	set_Tuple_pred(call, pn_Call_M_except, mem);
-	set_Tuple_pred(call, pn_Call_P_value_res_base, new_Bad());
-}  /* replace_call */
+static void replace_call(ir_node *irn, ir_node *call, ir_node *mem,
+                         ir_node *reg_jmp, ir_node *exc_jmp)
+{
+	ir_node  *block = get_nodes_block(call);
+	ir_graph *irg   = get_irn_irg(block);
+	ir_node  *rest  = new_r_Tuple(block, 1, &irn);
+
+	if (ir_throws_exception(call)) {
+		turn_into_tuple(call, pn_Call_max+1);
+		if (reg_jmp == NULL) {
+			reg_jmp = new_r_Jmp(block);
+		}
+		if (exc_jmp == NULL) {
+			exc_jmp = new_r_Bad(irg, mode_X);
+		}
+		set_Tuple_pred(call, pn_Call_X_regular, reg_jmp);
+		set_Tuple_pred(call, pn_Call_X_except, exc_jmp);
+	} else {
+		assert(reg_jmp == NULL);
+		assert(exc_jmp == NULL);
+		turn_into_tuple(call, pn_Call_T_result+1);
+		assert(pn_Call_M <= pn_Call_T_result);
+		assert(pn_Call_X_regular > pn_Call_T_result);
+		assert(pn_Call_X_except > pn_Call_T_result);
+	}
+	set_Tuple_pred(call, pn_Call_M, mem);
+	set_Tuple_pred(call, pn_Call_T_result, rest);
+}
 
 /* A mapper for the integer abs. */
-int i_mapper_abs(ir_node *call, void *ctx) {
+int i_mapper_abs(ir_node *call, void *ctx)
+{
+	ir_node  *mem      = get_Call_mem(call);
+	ir_node  *block    = get_nodes_block(call);
+	ir_node  *op       = get_Call_param(call, 0);
+	ir_graph *irg      = get_irn_irg(call);
+	ir_mode  *mode     = get_irn_mode(op);
+	dbg_info *dbg      = get_irn_dbg_info(call);
+	ir_node  *zero     = new_r_Const(irg, get_mode_null(mode));
+	ir_node  *cmp      = new_rd_Cmp(dbg, block, op, zero, ir_relation_less);
+	ir_node  *minus_op = new_rd_Minus(dbg, block, op, mode);
+	ir_node  *mux;
+	arch_allow_ifconv_func allow_ifconv = be_get_backend_param()->allow_ifconv;
+	(void) ctx;
+
+	/* mux allowed by backend? */
+	if (!allow_ifconv(cmp, op, minus_op))
+		return 0;
+
+	/* construct Mux */
+	mux = new_rd_Mux(dbg, block, cmp, op, minus_op, mode);
+	DBG_OPT_ALGSIM0(call, mux, FS_OPT_RTS_ABS);
+	replace_call(mux, call, mem, NULL, NULL);
+	return 1;
+}  /* i_mapper_abs */
+
+/* A mapper for the integer bswap. */
+int i_mapper_bswap(ir_node *call, void *ctx)
+{
 	ir_node *mem   = get_Call_mem(call);
 	ir_node *block = get_nodes_block(call);
 	ir_node *op    = get_Call_param(call, 0);
-	ir_node *irn;
+	ir_type *tp    = get_Call_type(call);
 	dbg_info *dbg  = get_irn_dbg_info(call);
+	ir_node *irn;
 	(void) ctx;
 
-	irn = new_rd_Abs(dbg, current_ir_graph, block, op, get_irn_mode(op));
-	DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_ABS);
+	irn = new_rd_Builtin(dbg, block, get_irg_no_mem(current_ir_graph), 1, &op, ir_bk_bswap, tp);
+	set_irn_pinned(irn, op_pin_state_floats);
+	irn = new_r_Proj(irn, get_irn_mode(op), pn_Builtin_1_result);
 	replace_call(irn, call, mem, NULL, NULL);
 	return 1;
-}  /* i_mapper_abs */
+}  /* i_mapper_bswap */
 
 /* A mapper for the alloca() function. */
-int i_mapper_alloca(ir_node *call, void *ctx) {
+int i_mapper_alloca(ir_node *call, void *ctx)
+{
 	ir_node *mem   = get_Call_mem(call);
 	ir_node *block = get_nodes_block(call);
 	ir_node *op    = get_Call_param(call, 0);
@@ -206,11 +290,26 @@ int i_mapper_alloca(ir_node *call, void *ctx) {
 	dbg_info *dbg  = get_irn_dbg_info(call);
 	(void) ctx;
 
-	irn    = new_rd_Alloc(dbg, current_ir_graph, block, mem, op, firm_unknown_type, stack_alloc);
-	mem    = new_Proj(irn, mode_M, pn_Alloc_M);
-	no_exc = new_Proj(irn, mode_X, pn_Alloc_X_regular);
-	exc    = new_Proj(irn, mode_X, pn_Alloc_X_except);
-	irn    = new_Proj(irn, get_modeP_data(), pn_Alloc_res);
+	if (mode_is_signed(get_irn_mode(op))) {
+		ir_mode *mode = get_irn_mode(op);
+		mode = find_unsigned_mode(mode);
+		if (mode == NULL) {
+			panic("Cannot find unsigned mode for %M", mode);
+		}
+		op = new_rd_Conv(dbg, block, op, mode);
+	}
+
+	irn    = new_rd_Alloc(dbg, block, mem, op, firm_unknown_type, stack_alloc);
+	mem    = new_rd_Proj(dbg, irn, mode_M, pn_Alloc_M);
+	irn    = new_rd_Proj(dbg, irn, get_modeP_data(), pn_Alloc_res);
+	if (ir_throws_exception(call)) {
+		no_exc = new_rd_Proj(dbg, irn, mode_X, pn_Alloc_X_regular);
+		exc    = new_rd_Proj(dbg, irn, mode_X, pn_Alloc_X_except);
+		ir_set_throws_exception(irn, true);
+	} else {
+		no_exc = NULL;
+		exc    = NULL;
+	}
 
 	DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_ALLOCA);
 	replace_call(irn, call, mem, no_exc, exc);
@@ -218,10 +317,11 @@ int i_mapper_alloca(ir_node *call, void *ctx) {
 }  /* i_mapper_alloca */
 
 /* A mapper for the floating point sqrt. */
-int i_mapper_sqrt(ir_node *call, void *ctx) {
-	ir_node *mem;
-	tarval *tv;
-	ir_node *op = get_Call_param(call, 0);
+int i_mapper_sqrt(ir_node *call, void *ctx)
+{
+	ir_node   *mem;
+	ir_tarval *tv;
+	ir_node   *op = get_Call_param(call, 0);
 	(void) ctx;
 
 	if (!is_Const(op))
@@ -240,10 +340,11 @@ int i_mapper_sqrt(ir_node *call, void *ctx) {
 }  /* i_mapper_sqrt */
 
 /* A mapper for the floating point cbrt. */
-int i_mapper_cbrt(ir_node *call, void *ctx) {
-	ir_node *mem;
-	tarval *tv;
-	ir_node *op = get_Call_param(call, 0);
+int i_mapper_cbrt(ir_node *call, void *ctx)
+{
+	ir_node   *mem;
+	ir_tarval *tv;
+	ir_node   *op = get_Call_param(call, 0);
 	(void) ctx;
 
 	if (!is_Const(op))
@@ -262,24 +363,28 @@ int i_mapper_cbrt(ir_node *call, void *ctx) {
 }  /* i_mapper_cbrt */
 
 /* A mapper for the floating point pow. */
-int i_mapper_pow(ir_node *call, void *ctx) {
+int i_mapper_pow(ir_node *call, void *ctx)
+{
+	ir_node  *left    = get_Call_param(call, 0);
+	ir_node  *right   = get_Call_param(call, 1);
+	ir_node  *block   = get_nodes_block(call);
+	ir_graph *irg     = get_irn_irg(block);
+	ir_node  *reg_jmp = NULL;
+	ir_node  *exc_jmp = NULL;
+	ir_node  *irn;
 	dbg_info *dbg;
-	ir_node *mem;
-	ir_node *left  = get_Call_param(call, 0);
-	ir_node *right = get_Call_param(call, 1);
-	ir_node *block = get_nodes_block(call);
-	ir_node *irn, *reg_jmp = NULL, *exc_jmp = NULL;
+	ir_node  *mem;
 	(void) ctx;
 
 	if (is_Const(left) && is_Const_one(left)) {
 		/* pow (1.0, x) = 1.0 */
 		irn = left;
 	} else if (is_Const(right)) {
-		tarval *tv = get_Const_tarval(right);
+		ir_tarval *tv = get_Const_tarval(right);
 		if (tarval_is_null(tv)) {
 			/* pow(x, 0.0) = 1.0 */
 			ir_mode *mode = get_tarval_mode(tv);
-			irn = new_r_Const(current_ir_graph, block, mode, get_mode_one(mode));
+			irn = new_r_Const(irg, get_mode_one(mode));
 		} else if (tarval_is_one(tv)) {
 			/* pow(x, 1.0) = x */
 			irn = left;
@@ -297,14 +402,17 @@ int i_mapper_pow(ir_node *call, void *ctx) {
 
 	if (irn == NULL) {
 		ir_mode *mode = get_irn_mode(left);
-		ir_node *quot;
-
-		irn  = new_r_Const(current_ir_graph, block, mode, get_mode_one(mode));
-		quot = new_rd_Quot(dbg, current_ir_graph, block, mem, irn, left, mode, op_pin_state_pinned);
-		mem  = new_r_Proj(current_ir_graph, block, quot, mode_M, pn_Quot_M);
-		irn  = new_r_Proj(current_ir_graph, block, quot, mode, pn_Quot_res);
-		reg_jmp = new_r_Proj(current_ir_graph, block, quot, mode_X, pn_Quot_X_regular);
-		exc_jmp = new_r_Proj(current_ir_graph, block, quot, mode_X, pn_Quot_X_except);
+		ir_node *div;
+
+		irn  = new_r_Const(irg, get_mode_one(mode));
+		div  = new_rd_Div(dbg, block, mem, irn, left, mode, op_pin_state_pinned);
+		mem  = new_r_Proj(div, mode_M, pn_Div_M);
+		irn  = new_r_Proj(div, mode, pn_Div_res);
+		if (ir_throws_exception(call)) {
+			reg_jmp = new_r_Proj(div, mode_X, pn_Div_X_regular);
+			exc_jmp = new_r_Proj(div, mode_X, pn_Div_X_except);
+			ir_set_throws_exception(div, true);
+		}
 	}
 	DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_POW);
 	replace_call(irn, call, mem, reg_jmp, exc_jmp);
@@ -312,15 +420,16 @@ int i_mapper_pow(ir_node *call, void *ctx) {
 }  /* i_mapper_pow */
 
 /* A mapper for the floating point exp. */
-int i_mapper_exp(ir_node *call, void *ctx) {
+int i_mapper_exp(ir_node *call, void *ctx)
+{
 	ir_node *val  = get_Call_param(call, 0);
 	(void) ctx;
 
 	if (is_Const(val) && is_Const_null(val)) {
 		/* exp(0.0) = 1.0 */
-		ir_node *block = get_nodes_block(call);
+		ir_graph *irg  = get_irn_irg(val);
 		ir_mode *mode  = get_irn_mode(val);
-		ir_node *irn   = new_r_Const(current_ir_graph, block, mode, get_mode_one(mode));
+		ir_node *irn   = new_r_Const(irg, get_mode_one(mode));
 		ir_node *mem   = get_Call_mem(call);
 		DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_EXP);
 		replace_call(irn, call, mem, NULL, NULL);
@@ -329,28 +438,11 @@ int i_mapper_exp(ir_node *call, void *ctx) {
 	return 0;
 }  /* i_mapper_exp */
 
-/* A mapper for the floating point log. */
-int i_mapper_log(ir_node *call, void *ctx) {
-	ir_node *val  = get_Call_param(call, 0);
-	(void) ctx;
-
-	if (is_Const(val) && is_Const_one(val)) {
-		/* log(1.0) = 0.0 */
-		ir_node *block = get_nodes_block(call);
-		ir_mode *mode  = get_irn_mode(val);
-		ir_node *irn   = new_r_Const(current_ir_graph, block, mode, get_mode_null(mode));
-		ir_node *mem   = get_Call_mem(call);
-		DBG_OPT_ALGSIM0(call, val, FS_OPT_RTS_LOG);
-		replace_call(val, call, mem, NULL, NULL);
-		return 1;
-	}
-	return 0;
-}  /* i_mapper_log */
-
 /**
  * A mapper for mapping f(0.0) to 0.0.
  */
-static int i_mapper_zero_to_zero(ir_node *call, void *ctx, int reason) {
+static int i_mapper_zero_to_zero(ir_node *call, void *ctx, int reason)
+{
 	ir_node *val  = get_Call_param(call, 0);
 	(void) ctx;
 
@@ -367,16 +459,17 @@ static int i_mapper_zero_to_zero(ir_node *call, void *ctx, int reason) {
 /**
  * A mapper for mapping f(1.0) to 0.0.
  */
-static int i_mapper_one_to_zero(ir_node *call, void *ctx, int reason) {
+static int i_mapper_one_to_zero(ir_node *call, void *ctx, int reason)
+{
 	ir_node *val  = get_Call_param(call, 0);
 	(void) ctx;
 
 	if (is_Const(val) && is_Const_one(val)) {
 		/* acos(1.0) = 0.0 */
-		ir_node *block = get_nodes_block(call);
-		ir_mode *mode  = get_irn_mode(val);
-		ir_node *irn   = new_r_Const(current_ir_graph, block, mode, get_mode_null(mode));
-		ir_node *mem   = get_Call_mem(call);
+		ir_graph *irg = get_irn_irg(val);
+		ir_mode *mode = get_irn_mode(val);
+		ir_node *irn  = new_r_Const(irg, get_mode_null(mode));
+		ir_node *mem  = get_Call_mem(call);
 		DBG_OPT_ALGSIM0(call, irn, reason);
 		replace_call(irn, call, mem, NULL, NULL);
 		return 1;
@@ -389,8 +482,10 @@ static int i_mapper_one_to_zero(ir_node *call, void *ctx, int reason) {
  * f(-x)  = f(x).
  * f(0.0) = 1.0
  */
-static int i_mapper_symmetric_zero_to_one(ir_node *call, void *ctx, int reason) {
-	ir_node *val  = get_Call_param(call, 0);
+static int i_mapper_symmetric_zero_to_one(ir_node *call, void *ctx, int reason)
+{
+	int      changed = 0;
+	ir_node *val     = get_Call_param(call, 0);
 	(void) ctx;
 
 	if (is_strictConv(val)) {
@@ -402,115 +497,476 @@ static int i_mapper_symmetric_zero_to_one(ir_node *call, void *ctx, int reason)
 			dbg_info *dbg  = get_irn_dbg_info(val);
 
 			op = get_Minus_op(op);
-			val = new_rd_Conv(dbg, current_ir_graph, block, op, mode);
+			val = new_rd_Conv(dbg, block, op, mode);
 			if (is_Conv(val)) {
 				/* still a Conv ? */
 				set_Conv_strict(val, 1);
 			}
 			DBG_OPT_ALGSIM2(call, op, call, FS_OPT_RTS_SYMMETRIC);
 			set_Call_param(call, 0, val);
+			changed = 1;
 		}
 	} else if (is_Minus(val)) {
 		/* f(-x) = f(x) */
 		val = get_Minus_op(val);
 		DBG_OPT_ALGSIM2(call, val, call, FS_OPT_RTS_SYMMETRIC);
 		set_Call_param(call, 0, val);
+		changed = 1;
 	}
 
 	if (is_Const(val) && is_Const_null(val)) {
 		/* f(0.0) = 1.0 */
-		ir_node *block = get_nodes_block(call);
+		ir_graph *irg  = get_irn_irg(val);
 		ir_mode *mode  = get_irn_mode(val);
-		ir_node *irn   = new_r_Const(current_ir_graph, block, mode, get_mode_one(mode));
+		ir_node *irn   = new_r_Const(irg, get_mode_one(mode));
 		ir_node *mem   = get_Call_mem(call);
 		DBG_OPT_ALGSIM0(call, irn, reason);
 		replace_call(irn, call, mem, NULL, NULL);
-		return 1;
+		changed = 1;
 	}
-	return 0;
+	return changed;
 }  /* i_mapper_symmetric_zero_to_one */
 
+/* A mapper for the floating point log. */
+int i_mapper_log(ir_node *call, void *ctx)
+{
+	/* log(1.0) = 0.0 */
+	return i_mapper_one_to_zero(call, ctx, FS_OPT_RTS_LOG);
+}  /* i_mapper_log */
+
 /* A mapper for the floating point sin. */
-int i_mapper_sin(ir_node *call, void *ctx) {
+int i_mapper_sin(ir_node *call, void *ctx)
+{
 	/* sin(0.0) = 0.0 */
 	return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_SIN);
 }  /* i_mapper_sin */
 
 /* A mapper for the floating point cos. */
-int i_mapper_cos(ir_node *call, void *ctx) {
+int i_mapper_cos(ir_node *call, void *ctx)
+{
 	/* cos(0.0) = 1.0, cos(-x) = x */
 	return i_mapper_symmetric_zero_to_one(call, ctx, FS_OPT_RTS_COS);
 }  /* i_mapper_cos */
 
 /* A mapper for the floating point tan. */
-int i_mapper_tan(ir_node *call, void *ctx) {
+int i_mapper_tan(ir_node *call, void *ctx)
+{
 	/* tan(0.0) = 0.0 */
 	return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_TAN);
 }  /* i_mapper_tan */
 
 /* A mapper for the floating point asin. */
-int i_mapper_asin(ir_node *call, void *ctx) {
+int i_mapper_asin(ir_node *call, void *ctx)
+{
 	/* asin(0.0) = 0.0 */
 	return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_ASIN);
 }  /* i_mapper_asin */
 
 /* A mapper for the floating point acos. */
-int i_mapper_acos(ir_node *call, void *ctx) {
+int i_mapper_acos(ir_node *call, void *ctx)
+{
 	/* acos(1.0) = 0.0 */
 	return i_mapper_one_to_zero(call, ctx, FS_OPT_RTS_ACOS);
 }  /* i_mapper_acos */
 
 /* A mapper for the floating point atan. */
-int i_mapper_atan(ir_node *call, void *ctx) {
+int i_mapper_atan(ir_node *call, void *ctx)
+{
 	/* atan(0.0) = 0.0 */
 	return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_ATAN);
 }  /* i_mapper_atan */
 
 /* A mapper for the floating point sinh. */
-int i_mapper_sinh(ir_node *call, void *ctx) {
+int i_mapper_sinh(ir_node *call, void *ctx)
+{
 	/* sinh(0.0) = 0.0 */
 	return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_SINH);
 }  /* i_mapper_sinh */
 
 /* A mapper for the floating point cosh. */
-int i_mapper_cosh(ir_node *call, void *ctx) {
+int i_mapper_cosh(ir_node *call, void *ctx)
+{
 	/* cosh(0.0) = 1.0, cosh(-x) = x */
 	return i_mapper_symmetric_zero_to_one(call, ctx, FS_OPT_RTS_COSH);
 }  /* i_mapper_cosh */
 
 /* A mapper for the floating point tanh. */
-int i_mapper_tanh(ir_node *call, void *ctx) {
+int i_mapper_tanh(ir_node *call, void *ctx)
+{
 	/* tanh(0.0) = 0.0 */
 	return i_mapper_zero_to_zero(call, ctx, FS_OPT_RTS_TANH);
 }  /* i_mapper_tanh */
 
+/**
+ * Return the const entity that is accessed through the pointer ptr or
+ * NULL if there is no entity (or the entity is not constant).
+ *
+ * @param ptr  the pointer
+ */
+static ir_entity *get_const_entity(ir_node *ptr)
+{
+	if (is_Global(ptr)) {
+		ir_entity *ent = get_Global_entity(ptr);
+
+		if (get_entity_linkage(ent) & IR_LINKAGE_CONSTANT) {
+			/* a constant entity */
+			return ent;
+		}
+	}
+	return NULL;
+}  /* get_const_entity */
+
+static bool initializer_val_is_null(ir_initializer_t *init)
+{
+	ir_tarval *tv;
+
+	if (get_initializer_kind(init) == IR_INITIALIZER_NULL)
+		return true;
+
+	if (get_initializer_kind(init) == IR_INITIALIZER_TARVAL) {
+		tv = get_initializer_tarval_value(init);
+	} else if (get_initializer_kind(init) == IR_INITIALIZER_CONST) {
+		ir_node *irn = get_initializer_const_value(init);
+		if (!is_Const(irn))
+			return false;
+		tv = get_Const_tarval(irn);
+	} else {
+		return false;
+	}
+
+	return tarval_is_null(tv);
+}
+
+/**
+ * Calculate the value of strlen if possible.
+ *
+ * @param ent     the entity
+ * @param res_tp  the result type
+ *
+ * @return a Const node containing the strlen() result or NULL
+ *         if the evaluation fails
+ */
+static ir_node *eval_strlen(ir_graph *irg, ir_entity *ent, ir_type *res_tp)
+{
+	ir_type *tp = get_entity_type(ent);
+	ir_mode *mode;
+	ir_initializer_t *initializer;
+	size_t            size;
+	size_t            i;
+
+	if (! is_Array_type(tp))
+		return NULL;
+	tp = get_array_element_type(tp);
+	if (! is_Primitive_type(tp))
+		return NULL;
+	mode = get_type_mode(tp);
+
+	/* FIXME: This is too restrict, as the type char might be more the 8bits */
+	if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
+		return NULL;
+
+	if (!has_entity_initializer(ent)) {
+		size_t i, n;
+
+		n = get_compound_ent_n_values(ent);
+		for (i = 0; i < n; ++i) {
+			ir_node *irn = get_compound_ent_value(ent, i);
+
+			if (! is_Const(irn))
+				return NULL;
+
+			if (is_Const_null(irn)) {
+				/* found the length */
+				ir_tarval *tv = new_tarval_from_long(i, get_type_mode(res_tp));
+				return new_r_Const(irg, tv);
+			}
+		}
+		return NULL;
+	}
+
+	initializer = get_entity_initializer(ent);
+	if (get_initializer_kind(initializer) != IR_INITIALIZER_COMPOUND)
+		return NULL;
+
+	size = get_initializer_compound_n_entries(initializer);
+	for (i = 0; i < size; ++i) {
+		ir_initializer_t *val = get_initializer_compound_value(initializer, i);
+		if (initializer_val_is_null(val)) {
+			ir_tarval *tv = new_tarval_from_long(i, get_type_mode(res_tp));
+			return new_r_Const(irg, tv);
+		}
+	}
+
+	return NULL;
+}  /* eval_strlen */
+
+/* A mapper for strlen */
+int i_mapper_strlen(ir_node *call, void *ctx)
+{
+	ir_node *s     = get_Call_param(call, 0);
+	ir_entity *ent = get_const_entity(s);
+
+	(void) ctx;
+
+	/* FIXME: this cannot handle constant strings inside struct initializers yet */
+	if (ent != NULL) {
+		/* a constant entity */
+		ir_type *tp = get_Call_type(call);
+		ir_node *irn;
+
+		tp  = get_method_res_type(tp, 0);
+		irn = eval_strlen(get_irn_irg(call), ent, tp);
+
+		if (irn) {
+			ir_node *mem = get_Call_mem(call);
+			DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_STRLEN);
+			replace_call(irn, call, mem, NULL, NULL);
+			return 1;
+		}
+	}
+	return 0;
+}  /* i_mapper_strlen */
+
+/**
+ * Calculate the value of strlen if possible.
+ *
+ * @param left    the left entity
+ * @param right   the right entity
+ * @param res_tp  the result type
+ *
+ * @return a Const node containing the strcmp() result or NULL
+ *         if the evaluation fails
+ */
+static ir_node *eval_strcmp(ir_graph *irg, ir_entity *left, ir_entity *right,
+                            ir_type *res_tp)
+{
+	ir_type *tp;
+	ir_mode *mode;
+
+	tp = get_entity_type(left);
+	if (! is_Array_type(tp))
+		return NULL;
+	tp = get_array_element_type(tp);
+	if (! is_Primitive_type(tp))
+		return NULL;
+	mode = get_type_mode(tp);
+
+	/* FIXME: This is too restrict, as the type char might be more the 8bits */
+	if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
+		return NULL;
+
+	tp = get_entity_type(right);
+	if (! is_Array_type(tp))
+		return NULL;
+	tp = get_array_element_type(tp);
+	if (! is_Primitive_type(tp))
+		return NULL;
+	mode = get_type_mode(tp);
+
+	/* FIXME: This is too restrict, as the type char might be more the 8bits */
+	if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
+		return NULL;
+
+	if (!has_entity_initializer(left) && !has_entity_initializer(right)) {
+		/* code that uses deprecated compound_graph_path stuff */
+		size_t n   = get_compound_ent_n_values(left);
+		size_t n_r = get_compound_ent_n_values(right);
+		size_t i;
+		int    res = 0;
+
+		if (n_r < n)
+			n = n_r;
+		for (i = 0; i < n; ++i) {
+			ir_node *irn;
+			long v_l, v_r;
+			ir_tarval *tv;
+
+			irn = get_compound_ent_value(left, i);
+			if (! is_Const(irn))
+				return NULL;
+			tv = get_Const_tarval(irn);
+			v_l = get_tarval_long(tv);
+
+			irn = get_compound_ent_value(right, i);
+			if (! is_Const(irn))
+				return NULL;
+			tv = get_Const_tarval(irn);
+			v_r = get_tarval_long(tv);
+
+			if (v_l < v_r) {
+				res = -1;
+				break;
+			}
+			if (v_l > v_r) {
+				res = +1;
+				break;
+			}
+
+			if (v_l == 0) {
+				res = 0;
+				break;
+			}
+		}
+		if (i < n) {
+			/* we found an end */
+			ir_tarval *tv = new_tarval_from_long(res, get_type_mode(res_tp));
+			return new_r_Const(irg, tv);
+		}
+		return NULL;
+	}
+
+	/* TODO */
+
+	return NULL;
+}  /* eval_strcmp */
+
+/**
+ * Checks if an entity represents the empty string.
+ *
+ * @param ent     the entity
+ *
+ * @return non-zero if ent represents the empty string
+ */
+static int is_empty_string(ir_entity *ent)
+{
+	ir_type          *tp = get_entity_type(ent);
+	ir_mode          *mode;
+	ir_node          *irn;
+	ir_initializer_t *initializer;
+	ir_initializer_t *init0;
+
+	if (! is_Array_type(tp))
+		return 0;
+	tp = get_array_element_type(tp);
+	if (! is_Primitive_type(tp))
+		return 0;
+	mode = get_type_mode(tp);
+
+	/* FIXME: This is too restrict, as the type char might be more the 8bits */
+	if (!mode_is_int(mode) || get_mode_size_bits(mode) != 8)
+		return 0;
+
+	if (!has_entity_initializer(ent)) {
+		/* code for deprecated compound_graph_path stuff */
+		size_t n = get_compound_ent_n_values(ent);
+		if (n < 1)
+			return 0;
+		irn = get_compound_ent_value(ent, 0);
+
+		return is_Const(irn) && is_Const_null(irn);
+	}
+
+	initializer = get_entity_initializer(ent);
+	if (get_initializer_kind(initializer) != IR_INITIALIZER_COMPOUND)
+		return 0;
+
+	if (get_initializer_compound_n_entries(initializer) < 1)
+		return 0;
+
+	init0 = get_initializer_compound_value(initializer, 0);
+	return initializer_val_is_null(init0);
+}  /* is_empty_string */
+
 /* A mapper for strcmp */
-int i_mapper_strcmp(ir_node *call, void *ctx) {
-	ir_node *left  = get_Call_param(call, 0);
-	ir_node *right = get_Call_param(call, 1);
-	ir_node *irn;
+int i_mapper_strcmp(ir_node *call, void *ctx)
+{
+	ir_node   *left    = get_Call_param(call, 0);
+	ir_node   *right   = get_Call_param(call, 1);
+	ir_node   *irn     = NULL;
+	ir_node   *exc     = NULL;
+	ir_node   *reg     = NULL;
+	ir_type   *call_tp = get_Call_type(call);
+	ir_type   *res_tp  = get_method_res_type(call_tp, 0);
+	ir_entity *ent_l, *ent_r;
+	ir_type   *char_tp;
+	ir_node   *v;
+
 	(void) ctx;
 
+	/* do some type checks first */
+	if (! is_Primitive_type(res_tp))
+		return 0;
+	char_tp = get_method_param_type(call_tp, 0);
+	if (char_tp != get_method_param_type(call_tp, 1))
+		return 0;
+	if (! is_Pointer_type(char_tp))
+		return 0;
+	char_tp = get_pointer_points_to_type(char_tp);
+
 	if (left == right) {
 		/* a strcmp(s, s) ==> 0 */
-		ir_node   *mem     = get_Call_mem(call);
-		ir_node   *adr     = get_Call_ptr(call);
-		ir_entity *ent     = get_SymConst_entity(adr);
-		ir_type   *call_tp = get_entity_type(ent);
-		ir_type   *res_tp  = get_method_res_type(call_tp, 0);
-		ir_mode   *mode    = get_type_mode(res_tp);
-		ir_node   *block   = get_nodes_block(call);
+		ir_graph *irg  = get_irn_irg(call);
+		ir_node *mem   = get_Call_mem(call);
+		ir_mode *mode  = get_type_mode(res_tp);
 
-		irn = new_r_Const(current_ir_graph, block, mode, get_mode_null(mode));
+		irn = new_r_Const(irg, get_mode_null(mode));
 		DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_STRCMP);
 		replace_call(irn, call, mem, NULL, NULL);
 		return 1;
 	}
+	ent_l = get_const_entity(left);
+	ent_r = get_const_entity(right);
+
+	if (ent_l != NULL && ent_r != NULL) {
+		/* both entities are const, try to evaluate */
+		irn = eval_strcmp(get_irn_irg(call), ent_l, ent_r, res_tp);
+	} else if (ent_l != NULL) {
+		if (is_empty_string(ent_l)) {
+			/* s strcmp("", s) ==> -(*s)*/
+			v = right;
+			goto replace_by_call;
+		}
+	} else if (ent_r != NULL) {
+		if (is_empty_string(ent_r)) {
+			/* s strcmp(s, "") ==> (*s) */
+			ir_node  *mem, *block;
+			dbg_info *dbg;
+			ir_mode  *mode;
+
+			v = left;
+replace_by_call:
+			mem   = get_Call_mem(call);
+			block = get_nodes_block(call);
+			dbg   = get_irn_dbg_info(call);
+			mode  = get_type_mode(char_tp);
+
+			/* replace the strcmp by (*x) */
+			irn = new_rd_Load(dbg, block, mem, v, mode, cons_none);
+			mem = new_r_Proj(irn, mode_M, pn_Load_M);
+			irn = new_r_Proj(irn, mode, pn_Load_res);
+			if (ir_throws_exception(call)) {
+				exc = new_r_Proj(irn, mode_X, pn_Load_X_except);
+				reg = new_r_Proj(irn, mode_X, pn_Load_X_regular);
+				ir_set_throws_exception(irn, true);
+			} else {
+				exc = NULL;
+				reg = NULL;
+			}
+
+			/* conv to the result mode */
+			mode = get_type_mode(res_tp);
+			irn  = new_rd_Conv(dbg, block, irn, mode);
+
+			if (v == right) {
+				/* negate in the ("", s) case */
+				irn = new_rd_Minus(dbg, block, irn, mode);
+			}
+		}
+	}
+
+	if (irn != NULL) {
+		ir_node *mem = get_Call_mem(call);
+		DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_STRCMP);
+		replace_call(irn, call, mem, reg, exc);
+		return 1;
+	}
+
 	return 0;
 }  /* i_mapper_strcmp */
 
 /* A mapper for strncmp */
-int i_mapper_strncmp(ir_node *call, void *ctx) {
+int i_mapper_strncmp(ir_node *call, void *ctx)
+{
 	ir_node *left  = get_Call_param(call, 0);
 	ir_node *right = get_Call_param(call, 1);
 	ir_node *len   = get_Call_param(call, 2);
@@ -520,15 +976,15 @@ int i_mapper_strncmp(ir_node *call, void *ctx) {
 	if (left == right || (is_Const(len) && is_Const_null(len))) {
 		/* a strncmp(s, s, len) ==> 0 OR
 		   a strncmp(a, b, 0) ==> 0 */
+		ir_graph  *irg     = get_irn_irg(call);
 		ir_node   *mem     = get_Call_mem(call);
 		ir_node   *adr     = get_Call_ptr(call);
 		ir_entity *ent     = get_SymConst_entity(adr);
 		ir_type   *call_tp = get_entity_type(ent);
 		ir_type   *res_tp  = get_method_res_type(call_tp, 0);
 		ir_mode   *mode    = get_type_mode(res_tp);
-		ir_node   *block   = get_nodes_block(call);
 
-		irn = new_r_Const(current_ir_graph, block, mode, get_mode_null(mode));
+		irn = new_r_Const(irg, get_mode_null(mode));
 		DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_STRNCMP);
 		replace_call(irn, call, mem, NULL, NULL);
 		return 1;
@@ -536,93 +992,92 @@ int i_mapper_strncmp(ir_node *call, void *ctx) {
 	return 0;
 }  /* i_mapper_strncmp */
 
-/**
- * Calculate the value of strlen if possible.
- *
- * @param ent     the entity
- * @param res_tp  the result type
- */
-static ir_node *eval_strlen(ir_entity *ent, ir_type *res_tp) {
-	ir_type *tp = get_entity_type(ent);
-	ir_mode *mode;
-	int     i, n, len = -1;
-
-	if (! is_Array_type(tp))
-		return NULL;
-	tp = get_array_element_type(tp);
-	if (! is_Primitive_type(tp))
-		return NULL;
-	mode = get_type_mode(tp);
-
-	/* FIXME: This is too restrict, as the type char might be more the 8bits */
-	if (!mode_is_int(mode) || get_mode_size_bits(mode) != get_mode_size_bits(mode_Bs))
-		return NULL;
-
-	n = get_compound_ent_n_values(ent);
-	for (i = 0; i < n; ++i) {
-		ir_node *irn = get_compound_ent_value(ent, i);
+/* A mapper for strcpy */
+int i_mapper_strcpy(ir_node *call, void *ctx)
+{
+	ir_node *dst = get_Call_param(call, 0);
+	ir_node *src = get_Call_param(call, 1);
+	(void) ctx;
 
-		if (! is_Const(irn))
-			return NULL;
+	if (dst == src) {
+		/* a strcpy(d, s) ==> d */
+		ir_node *mem = get_Call_mem(call);
+		ir_node *dst = get_Call_param(call, 0);
 
-		if (is_Const_null(irn)) {
-			/* found the length */
-			len = i;
-			break;
-		}
-	}
-	if (len >= 0) {
-		tarval *tv = new_tarval_from_long(len, get_type_mode(res_tp));
-		return new_Const_type(tv, res_tp);
+		DBG_OPT_ALGSIM0(call, dst, FS_OPT_RTS_STRCPY);
+		replace_call(dst, call, mem, NULL, NULL);
+		return 1;
 	}
-	return NULL;
-}  /* eval_strlen */
+	return 0;
+}  /* i_mapper_strcpy */
 
-/* A mapper for strlen */
-int i_mapper_strlen(ir_node *call, void *ctx) {
-	ir_node *s   = get_Call_param(call, 0);
-	ir_node *irn = NULL;
+/* A mapper for memcpy */
+int i_mapper_memcpy(ir_node *call, void *ctx)
+{
+	ir_node *dst = get_Call_param(call, 0);
+	ir_node *src = get_Call_param(call, 1);
+	ir_node *len = get_Call_param(call, 2);
+	(void) ctx;
 
-	/* FIXME: this cannot handle constant strings inside struct initializers yet */
-	if (is_SymConst(s) && get_SymConst_kind(s) == symconst_addr_ent) {
-		ir_entity *ent = get_SymConst_entity(s);
+	if (dst == src || (is_Const(len) && is_Const_null(len))) {
+		/* a memcpy(d, d, len) ==> d OR
+		   a memcpy(d, s, 0) ==> d */
+		ir_node *mem = get_Call_mem(call);
 
-		if (get_entity_variability(ent) == variability_constant) {
-			/* a constant entity */
-			ir_type *tp = get_Call_type(call);
+		DBG_OPT_ALGSIM0(call, dst, FS_OPT_RTS_MEMCPY);
+		replace_call(dst, call, mem, NULL, NULL);
+		return 1;
+	}
+	return 0;
+}  /* i_mapper_memcpy */
 
-			tp  = get_method_res_type(tp, 0);
-			irn = eval_strlen(ent, tp);
+/* A mapper for mempcpy */
+int i_mapper_mempcpy(ir_node *call, void *ctx)
+{
+	ir_node *dst = get_Call_param(call, 0);
+	ir_node *src = get_Call_param(call, 1);
+	ir_node *len = get_Call_param(call, 2);
+	(void) ctx;
 
-			if (irn) {
-				ir_node *mem = get_Call_mem(call);
-				DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_STRLEN);
-				replace_call(irn, call, mem, NULL, NULL);
-			}
-		}
+	if (dst == src || (is_Const(len) && is_Const_null(len))) {
+		/* a memcpy(d, d, len) ==> d + len OR
+		   a memcpy(d, s, 0) ==> d + 0 */
+		dbg_info *dbg = get_irn_dbg_info(call);
+		ir_node *mem  = get_Call_mem(call);
+		ir_node *blk  = get_nodes_block(call);
+		ir_mode *mode = get_irn_mode(dst);
+		ir_node *res  = new_rd_Add(dbg, blk, dst, len, mode);
+
+		DBG_OPT_ALGSIM0(call, res, FS_OPT_RTS_MEMPCPY);
+		replace_call(res, call, mem, NULL, NULL);
+		return 1;
 	}
 	return 0;
-}  /* i_mapper_strlen */
+}  /* i_mapper_mempcpy */
 
-/* A mapper for memcpy */
-int i_mapper_memcpy(ir_node *call, void *ctx) {
+/* A mapper for memmove */
+int i_mapper_memmove(ir_node *call, void *ctx)
+{
+	ir_node *dst = get_Call_param(call, 0);
+	ir_node *src = get_Call_param(call, 1);
 	ir_node *len = get_Call_param(call, 2);
 	(void) ctx;
 
-	if (is_Const(len) && is_Const_null(len)) {
-		/* a memcpy(d, s, 0) ==> d */
+	if (dst == src || (is_Const(len) && is_Const_null(len))) {
+		/* a memmove(d, d, len) ==> d OR
+		   a memmove(d, s, 0) ==> d */
 		ir_node *mem = get_Call_mem(call);
-		ir_node *dst = get_Call_param(call, 0);
 
-		DBG_OPT_ALGSIM0(call, dst, FS_OPT_RTS_MEMCPY);
+		DBG_OPT_ALGSIM0(call, dst, FS_OPT_RTS_MEMMOVE);
 		replace_call(dst, call, mem, NULL, NULL);
 		return 1;
 	}
 	return 0;
-}  /* i_mapper_memcpy */
+}  /* i_mapper_memmove */
 
 /* A mapper for memset */
-int i_mapper_memset(ir_node *call, void *ctx) {
+int i_mapper_memset(ir_node *call, void *ctx)
+{
 	ir_node *len = get_Call_param(call, 2);
 	(void) ctx;
 
@@ -638,16 +1093,43 @@ int i_mapper_memset(ir_node *call, void *ctx) {
 	return 0;
 }  /* i_mapper_memset */
 
+/* A mapper for memcmp */
+int i_mapper_memcmp(ir_node *call, void *ctx)
+{
+	ir_node *left  = get_Call_param(call, 0);
+	ir_node *right = get_Call_param(call, 1);
+	ir_node *len   = get_Call_param(call, 2);
+	ir_node *irn;
+	(void) ctx;
+
+	if (left == right || (is_Const(len) && is_Const_null(len))) {
+		/* a memcmp(s, s, len) ==> 0 OR
+		   a memcmp(a, b, 0) ==> 0 */
+		ir_graph  *irg     = get_irn_irg(call);
+		ir_node   *mem     = get_Call_mem(call);
+		ir_node   *adr     = get_Call_ptr(call);
+		ir_entity *ent     = get_SymConst_entity(adr);
+		ir_type   *call_tp = get_entity_type(ent);
+		ir_type   *res_tp  = get_method_res_type(call_tp, 0);
+		ir_mode   *mode    = get_type_mode(res_tp);
+
+		irn = new_r_Const(irg, get_mode_null(mode));
+		DBG_OPT_ALGSIM0(call, irn, FS_OPT_RTS_STRNCMP);
+		replace_call(irn, call, mem, NULL, NULL);
+		return 1;
+	}
+	return 0;
+}  /* i_mapper_memcmp */
+
 /**
  * Returns the result mode of a node.
  */
-static ir_mode *get_irn_res_mode(ir_node *node) {
+static ir_mode *get_irn_res_mode(ir_node *node)
+{
 	switch (get_irn_opcode(node)) {
 	case iro_Load:   return get_Load_mode(node);
-	case iro_Quot:   return get_Quot_resmode(node);
 	case iro_Div:    return get_Div_resmode(node);
 	case iro_Mod:    return get_Mod_resmode(node);
-	case iro_DivMod: return get_DivMod_resmode(node);
 	default: return NULL;
 	}
 }  /* get_irn_res_mode */
@@ -655,12 +1137,15 @@ static ir_mode *get_irn_res_mode(ir_node *node) {
 #define LMAX(a, b) ((a) > (b) ? (a) : (b))
 
 /* A mapper for mapping unsupported instructions to runtime calls. */
-int i_mapper_RuntimeCall(ir_node *node, runtime_rt *rt) {
+int i_mapper_RuntimeCall(ir_node *node, runtime_rt *rt)
+{
 	int i, j, arity, first, n_param, n_res;
 	long n_proj;
 	ir_type *mtp;
 	ir_node *mem, *bl, *call, *addr, *res_proj;
 	ir_node **in;
+	bool     throws_exception;
+	ir_op   *op;
 	ir_graph *irg;
 	symconst_symbol sym;
 	ir_mode *mode = get_irn_mode(node);
@@ -701,15 +1186,17 @@ int i_mapper_RuntimeCall(ir_node *node, runtime_rt *rt) {
 			return 0;
 	}
 
-	n_res = get_method_n_ress(mtp);
+	n_res            = get_method_n_ress(mtp);
+	throws_exception = ir_throws_exception(node);
 
 	/* step 0: calculate the number of needed Proj's */
 	n_proj = 0;
 	n_proj = LMAX(n_proj, rt->mem_proj_nr + 1);
-	n_proj = LMAX(n_proj, rt->regular_proj_nr + 1);
-	n_proj = LMAX(n_proj, rt->exc_proj_nr + 1);
-	n_proj = LMAX(n_proj, rt->exc_mem_proj_nr + 1);
 	n_proj = LMAX(n_proj, rt->res_proj_nr + 1);
+	if (throws_exception) {
+		n_proj = LMAX(n_proj, rt->regular_proj_nr + 1);
+		n_proj = LMAX(n_proj, rt->exc_proj_nr + 1);
+	}
 
 	if (n_proj > 0) {
 		if (rt->mode != mode_T) /* must be mode_T */
@@ -723,6 +1210,7 @@ int i_mapper_RuntimeCall(ir_node *node, runtime_rt *rt) {
 
 	/* ok, when we are here, the number of predecessors match as well as the parameter modes */
 	bl = get_nodes_block(node);
+	op = get_irn_op(node);
 
 	in = NULL;
 	if (n_param > 0) {
@@ -733,12 +1221,12 @@ int i_mapper_RuntimeCall(ir_node *node, runtime_rt *rt) {
 
 	/* step 1: create the call */
 	sym.entity_p = rt->ent;
-	addr = new_r_SymConst(irg, bl, sym, symconst_addr_ent);
-	call = new_rd_Call(get_irn_dbg_info(node), irg, bl, mem, addr, n_param, in, mtp);
+	addr = new_r_SymConst(irg, mode_P_code, sym, symconst_addr_ent);
+	call = new_rd_Call(get_irn_dbg_info(node), bl, mem, addr, n_param, in, mtp);
 	set_irn_pinned(call, get_irn_pinned(node));
 
 	if (n_res > 0)
-		res_proj = new_r_Proj(irg, bl, call, mode_T, pn_Call_T_result);
+		res_proj = new_r_Proj(call, mode_T, pn_Call_T_result);
 	else
 		res_proj = NULL;
 
@@ -748,32 +1236,28 @@ int i_mapper_RuntimeCall(ir_node *node, runtime_rt *rt) {
 		/* we are ready */
 		turn_into_tuple(node, n_proj);
 
-		for (i = 0; i < n_proj; ++i)
-			set_Tuple_pred(node, i, new_r_Bad(irg));
 		if (rt->mem_proj_nr >= 0)
-			set_Tuple_pred(node, rt->mem_proj_nr, new_r_Proj(irg, bl, call, mode_M, pn_Call_M_regular));
-		if (get_irn_op(mem) != op_NoMem) {
-			/* Exceptions can only be handled with real memory */
-			if (rt->regular_proj_nr >= 0)
-				set_Tuple_pred(node, rt->regular_proj_nr, new_r_Proj(irg, bl, call, mode_X, pn_Call_X_regular));
-			if (rt->exc_proj_nr >= 0)
-				set_Tuple_pred(node, rt->exc_proj_nr, new_r_Proj(irg, bl, call, mode_X, pn_Call_X_except));
-			if (rt->exc_mem_proj_nr >= 0)
-				set_Tuple_pred(node, rt->mem_proj_nr, new_r_Proj(irg, bl, call, mode_M, pn_Call_M_except));
+			set_Tuple_pred(node, rt->mem_proj_nr, new_r_Proj(call, mode_M, pn_Call_M));
+		if (throws_exception) {
+			set_Tuple_pred(node, op->pn_x_regular, new_r_Proj(call, mode_X, pn_Call_X_regular));
+			set_Tuple_pred(node, op->pn_x_except, new_r_Proj(call, mode_X, pn_Call_X_except));
 		}
 
-		if (rt->res_proj_nr >= 0)
-			for (i = 0; i < n_res; ++i)
-				set_Tuple_pred(node, rt->res_proj_nr + i,
-				new_r_Proj(irg, bl, res_proj, get_type_mode(get_method_res_type(mtp, i)), i));
-			return 1;
+		if (rt->res_proj_nr >= 0) {
+			for (i = 0; i < n_res; ++i) {
+				ir_mode *mode = get_type_mode(get_method_res_type(mtp, i));
+				ir_node *proj = new_r_Proj(res_proj, mode, i);
+				set_Tuple_pred(node, rt->res_proj_nr + i, proj);
+			}
+		}
+		return 1;
 	} else {
 		/* only one return value supported */
 		if (n_res > 0) {
 			ir_mode *mode = get_type_mode(get_method_res_type(mtp, 0));
 
-			res_proj = new_r_Proj(irg, bl, call, mode_T, pn_Call_T_result);
-			res_proj = new_r_Proj(irg, bl, res_proj, mode, 0);
+			res_proj = new_r_Proj(call, mode_T, pn_Call_T_result);
+			res_proj = new_r_Proj(res_proj, mode, 0);
 
 			exchange(node, res_proj);
 			return 1;