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comparison gcc/tree-nrv.c @ 67:f6334be47118

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update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
author nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
date Tue, 22 Mar 2011 17:18:12 +0900
parents b7f97abdc517
children 04ced10e8804
comparison
equal deleted inserted replaced
65:65488c3d617d 67:f6334be47118
23 #include "coretypes.h" 23 #include "coretypes.h"
24 #include "tm.h" 24 #include "tm.h"
25 #include "tree.h" 25 #include "tree.h"
26 #include "function.h" 26 #include "function.h"
27 #include "basic-block.h" 27 #include "basic-block.h"
28 #include "diagnostic.h"
29 #include "tree-pretty-print.h" 28 #include "tree-pretty-print.h"
30 #include "tree-flow.h" 29 #include "tree-flow.h"
31 #include "timevar.h" 30 #include "timevar.h"
32 #include "tree-dump.h" 31 #include "tree-dump.h"
33 #include "tree-pass.h" 32 #include "tree-pass.h"
258 gsi_next (&gsi); 257 gsi_next (&gsi);
259 } 258 }
260 } 259 }
261 } 260 }
262 261
262 SET_DECL_VALUE_EXPR (found, result);
263 DECL_HAS_VALUE_EXPR_P (found) = 1;
264
263 /* FOUND is no longer used. Ensure it gets removed. */ 265 /* FOUND is no longer used. Ensure it gets removed. */
264 var_ann (found)->used = 0; 266 clear_is_used (found);
265 return 0; 267 return 0;
266 } 268 }
267 269
268 static bool 270 static bool
269 gate_pass_return_slot (void) 271 gate_pass_return_slot (void)
292 294
293 /* Determine (pessimistically) whether DEST is available for NRV 295 /* Determine (pessimistically) whether DEST is available for NRV
294 optimization, where DEST is expected to be the LHS of a modify 296 optimization, where DEST is expected to be the LHS of a modify
295 expression where the RHS is a function returning an aggregate. 297 expression where the RHS is a function returning an aggregate.
296 298
297 DEST is available if it is not clobbered by the call. */ 299 DEST is available if it is not clobbered or used by the call. */
298 300
299 static bool 301 static bool
300 dest_safe_for_nrv_p (gimple call) 302 dest_safe_for_nrv_p (gimple call)
301 { 303 {
302 tree dest = gimple_call_lhs (call); 304 tree dest = gimple_call_lhs (call);
306 return false; 308 return false;
307 309
308 if (TREE_CODE (dest) == SSA_NAME) 310 if (TREE_CODE (dest) == SSA_NAME)
309 return true; 311 return true;
310 312
311 if (call_may_clobber_ref_p (call, dest)) 313 if (call_may_clobber_ref_p (call, dest)
314 || ref_maybe_used_by_stmt_p (call, dest))
312 return false; 315 return false;
313 316
314 return true; 317 return true;
315 } 318 }
316 319
341 344
342 if (is_gimple_call (stmt) 345 if (is_gimple_call (stmt)
343 && gimple_call_lhs (stmt) 346 && gimple_call_lhs (stmt)
344 && !gimple_call_return_slot_opt_p (stmt) 347 && !gimple_call_return_slot_opt_p (stmt)
345 && aggregate_value_p (TREE_TYPE (gimple_call_lhs (stmt)), 348 && aggregate_value_p (TREE_TYPE (gimple_call_lhs (stmt)),
346 gimple_call_fndecl (stmt)) 349 gimple_call_fndecl (stmt)))
347 )
348 { 350 {
349 /* Check if the location being assigned to is 351 /* Check if the location being assigned to is
350 clobbered by the call. */ 352 clobbered by the call. */
351 slot_opt_p = dest_safe_for_nrv_p (stmt); 353 slot_opt_p = dest_safe_for_nrv_p (stmt);
352 gimple_call_set_return_slot_opt (stmt, slot_opt_p); 354 gimple_call_set_return_slot_opt (stmt, slot_opt_p);