From bea966c222bf8900ebfcc5cd6d83e507b6bec748 Mon Sep 17 00:00:00 2001 From: Richard Guenther Date: Thu, 3 May 2012 13:07:31 +0000 Subject: tree-ssa-pre.c (valid_in_sets): Remove checking of trapping operations. 2012-05-03 Richard Guenther * tree-ssa-pre.c (valid_in_sets): Remove checking of trapping operations. (prune_clobbered_mems): Do it here. Do not uselessly sort expressions. (compute_avail): Do not add possibly trapping operations to EXP_GEN if they might not be executed in the block. * gcc.dg/tree-ssa/ssa-pre-27.c: Remove XFAIL. From-SVN: r187096 --- gcc/tree-ssa-pre.c | 61 +++++++++++++++++++++++++++++++----------------------- 1 file changed, 35 insertions(+), 26 deletions(-) (limited to 'gcc/tree-ssa-pre.c') diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c index e27e914..776a37c 100644 --- a/gcc/tree-ssa-pre.c +++ b/gcc/tree-ssa-pre.c @@ -2069,13 +2069,6 @@ valid_in_sets (bitmap_set_t set1, bitmap_set_t set2, pre_expr expr, for (i = 0; i < nary->length; i++) if (!op_valid_in_sets (set1, set2, nary->op[i])) return false; - /* If the NARY may trap make sure the block does not contain - a possible exit point. - ??? This is overly conservative if we translate AVAIL_OUT - as the available expression might be after the exit point. */ - if (BB_MAY_NOTRETURN (block) - && vn_nary_may_trap (nary)) - return false; return true; } break; @@ -2140,35 +2133,44 @@ clean (bitmap_set_t set, basic_block block) } /* Clean the set of expressions that are no longer valid in SET because - they are clobbered in BLOCK. */ + they are clobbered in BLOCK or because they trap and may not be executed. */ static void prune_clobbered_mems (bitmap_set_t set, basic_block block) { - VEC (pre_expr, heap) *exprs = sorted_array_from_bitmap_set (set); - pre_expr expr; - int i; + bitmap_iterator bi; + unsigned i; - FOR_EACH_VEC_ELT (pre_expr, exprs, i, expr) + FOR_EACH_EXPR_ID_IN_SET (set, i, bi) { - vn_reference_t ref; - if (expr->kind != REFERENCE) - continue; - - ref = PRE_EXPR_REFERENCE (expr); - if (ref->vuse) + pre_expr expr = expression_for_id (i); + if (expr->kind == REFERENCE) + { + vn_reference_t ref = PRE_EXPR_REFERENCE (expr); + if (ref->vuse) + { + gimple def_stmt = SSA_NAME_DEF_STMT (ref->vuse); + if (!gimple_nop_p (def_stmt) + && ((gimple_bb (def_stmt) != block + && !dominated_by_p (CDI_DOMINATORS, + block, gimple_bb (def_stmt))) + || (gimple_bb (def_stmt) == block + && value_dies_in_block_x (expr, block)))) + bitmap_remove_from_set (set, expr); + } + } + else if (expr->kind == NARY) { - gimple def_stmt = SSA_NAME_DEF_STMT (ref->vuse); - if (!gimple_nop_p (def_stmt) - && ((gimple_bb (def_stmt) != block - && !dominated_by_p (CDI_DOMINATORS, - block, gimple_bb (def_stmt))) - || (gimple_bb (def_stmt) == block - && value_dies_in_block_x (expr, block)))) + vn_nary_op_t nary = PRE_EXPR_NARY (expr); + /* If the NARY may trap make sure the block does not contain + a possible exit point. + ??? This is overly conservative if we translate AVAIL_OUT + as the available expression might be after the exit point. */ + if (BB_MAY_NOTRETURN (block) + && vn_nary_may_trap (nary)) bitmap_remove_from_set (set, expr); } } - VEC_free (pre_expr, heap, exprs); } static sbitmap has_abnormal_preds; @@ -4119,6 +4121,13 @@ compute_avail (void) if (TREE_CODE (nary->op[i]) == SSA_NAME) add_to_exp_gen (block, nary->op[i]); + /* If the NARY traps and there was a preceeding + point in the block that might not return avoid + adding the nary to EXP_GEN. */ + if (BB_MAY_NOTRETURN (block) + && vn_nary_may_trap (nary)) + continue; + result = (pre_expr) pool_alloc (pre_expr_pool); result->kind = NARY; result->id = 0; -- cgit v1.1