/*
- * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
*
* This file is part of libFirm.
*
#include "ia32_transform.h"
#include "ia32_dbg_stat.h"
#include "ia32_util.h"
+#include "ia32_architecture.h"
DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
}
#endif
+static int produces_zero_flag(ir_node *node, int pn)
+{
+ ir_node *count;
+ const ia32_immediate_attr_t *imm_attr;
+
+ if(!is_ia32_irn(node))
+ return 0;
+
+ if(pn >= 0) {
+ if(pn != pn_ia32_res)
+ return 0;
+ }
+
+ switch(get_ia32_irn_opcode(node)) {
+ case iro_ia32_Add:
+ case iro_ia32_Adc:
+ case iro_ia32_And:
+ case iro_ia32_Or:
+ case iro_ia32_Xor:
+ case iro_ia32_Sub:
+ case iro_ia32_Sbb:
+ case iro_ia32_Neg:
+ case iro_ia32_Inc:
+ case iro_ia32_Dec:
+ return 1;
+
+ case iro_ia32_ShlD:
+ case iro_ia32_ShrD:
+ case iro_ia32_Shl:
+ case iro_ia32_Shr:
+ case iro_ia32_Sar:
+ assert(n_ia32_ShlD_count == n_ia32_ShrD_count);
+ assert(n_ia32_Shl_count == n_ia32_Shr_count
+ && n_ia32_Shl_count == n_ia32_Sar_count);
+ if(is_ia32_ShlD(node) || is_ia32_ShrD(node)) {
+ count = get_irn_n(node, n_ia32_ShlD_count);
+ } else {
+ count = get_irn_n(node, n_ia32_Shl_count);
+ }
+ /* when shift count is zero the flags are not affected, so we can only
+ * do this for constants != 0 */
+ if(!is_ia32_Immediate(count))
+ return 0;
+
+ imm_attr = get_ia32_immediate_attr_const(count);
+ if(imm_attr->symconst != NULL)
+ return 0;
+ if((imm_attr->offset & 0x1f) == 0)
+ return 0;
+ return 1;
+
+ default:
+ break;
+ }
+ return 0;
+}
+
+static ir_node *turn_into_mode_t(ir_node *node)
+{
+ ir_node *block;
+ ir_node *res_proj;
+ ir_node *new_node;
+ const arch_register_t *reg;
+
+ if(get_irn_mode(node) == mode_T)
+ return node;
+
+ assert(get_irn_mode(node) == mode_Iu);
+
+ new_node = exact_copy(node);
+ set_irn_mode(new_node, mode_T);
+
+ block = get_nodes_block(new_node);
+ res_proj = new_r_Proj(current_ir_graph, block, new_node, mode_Iu,
+ pn_ia32_res);
+
+ reg = arch_get_irn_register(arch_env, node);
+ arch_set_irn_register(arch_env, res_proj, reg);
+
+ be_peephole_before_exchange(node, res_proj);
+ sched_add_before(node, new_node);
+ sched_remove(node);
+ exchange(node, res_proj);
+ be_peephole_after_exchange(res_proj);
+
+ return new_node;
+}
+
+static void peephole_ia32_Test(ir_node *node)
+{
+ ir_node *left = get_irn_n(node, n_ia32_Test_left);
+ ir_node *right = get_irn_n(node, n_ia32_Test_right);
+ ir_node *flags_proj;
+ ir_node *block;
+ ir_mode *flags_mode;
+ int pn = -1;
+ ir_node *schedpoint;
+ const ir_edge_t *edge;
+
+ assert(n_ia32_Test_left == n_ia32_Test8Bit_left
+ && n_ia32_Test_right == n_ia32_Test8Bit_right);
+
+ /* we need a test for 0 */
+ if(left != right)
+ return;
+
+ block = get_nodes_block(node);
+ if(get_nodes_block(left) != block)
+ return;
+
+ if(is_Proj(left)) {
+ pn = get_Proj_proj(left);
+ left = get_Proj_pred(left);
+ }
+
+ /* walk schedule up and abort when we find left or some other node destroys
+ the flags */
+ schedpoint = sched_prev(node);
+ while(schedpoint != left) {
+ schedpoint = sched_prev(schedpoint);
+ if(arch_irn_is(arch_env, schedpoint, modify_flags))
+ return;
+ if(schedpoint == block)
+ panic("couldn't find left");
+ }
+
+ /* make sure only Lg/Eq tests are used */
+ foreach_out_edge(node, edge) {
+ ir_node *user = get_edge_src_irn(edge);
+ int pnc = get_ia32_condcode(user);
+
+ if(pnc != pn_Cmp_Eq && pnc != pn_Cmp_Lg) {
+ return;
+ }
+ }
+
+ if(!produces_zero_flag(left, pn))
+ return;
+
+ left = turn_into_mode_t(left);
+
+ flags_mode = ia32_reg_classes[CLASS_ia32_flags].mode;
+ flags_proj = new_r_Proj(current_ir_graph, block, left, flags_mode,
+ pn_ia32_flags);
+ arch_set_irn_register(arch_env, flags_proj, &ia32_flags_regs[REG_EFLAGS]);
+
+ assert(get_irn_mode(node) != mode_T);
+
+ be_peephole_before_exchange(node, flags_proj);
+ exchange(node, flags_proj);
+ sched_remove(node);
+ be_peephole_after_exchange(flags_proj);
+}
+
// only optimize up to 48 stores behind IncSPs
#define MAXPUSH_OPTIMIZE 48
}
make_add_immediate:
- if(cg->isa->opt & IA32_OPT_INCDEC) {
+ if(ia32_cg_config.use_incdec) {
if(is_am_one(node)) {
dbgi = get_irn_dbg_info(node);
block = get_nodes_block(node);
//register_peephole_optimisation(op_ia32_Store, peephole_ia32_Store);
register_peephole_optimisation(op_be_IncSP, peephole_be_IncSP);
register_peephole_optimisation(op_ia32_Lea, peephole_ia32_Lea);
+ register_peephole_optimisation(op_ia32_Test, peephole_ia32_Test);
+ register_peephole_optimisation(op_ia32_Test8Bit, peephole_ia32_Test);
be_peephole_opt(cg->birg);
}
projects / libfirm / blobdiff