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([2601:181:c000:c497:a2a8:cdff:fe3e:b48]) by smtp.googlemail.com with ESMTPSA id g108sm1188941qge.23.2016.02.24.05.46.48 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 24 Feb 2016 05:46:48 -0800 (PST) To: GCC Patches From: Nathan Sidwell Subject: [gomp4][PR 69916] Fix ICE Message-ID: <56CDB448.3060501@acm.org> Date: Wed, 24 Feb 2016 08:46:48 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 bug 69916 is an instance of an openacc loop that is lowered during omp-low, but determined to be a nop and removed before oacc-device-lower. (j is dead after the loop). This confused the openacc loop transform code, which still detected it via its loop header, but encountered no IFN_GOACC_LOOP fns to transform. Fixed by counting the IFN_GOACC_LOOP calls during loop detection, and not trying to transform those calls if they don't exist. nathan 2016-02-24 Nathan Sidwell gcc/ PR other/69916 * omp-low.c (struct oacc_loop): Add ifns. (new_oacc_loop_raw): Initialize it. (finish_oacc_loop): Clear mask & flags if no ifns. (oacc_loop_discover_walk): Count IFN_GOACC_LOOP calls. (oacc_loop_xform_loop): Add ifns arg & adjust. (oacc_loop_process): Adjust oacc_loop_xform_loop call. gcc/testsuite/ PR other/69916 * c-c-++-common/goacc/pr69916.c: New. Index: omp-low.c =================================================================== --- omp-low.c (revision 233648) +++ omp-low.c (working copy) @@ -254,6 +254,7 @@ struct oacc_loop unsigned mask; /* Partitioning mask. */ unsigned inner; /* Partitioning of inner loops. */ unsigned flags; /* Partitioning flags. */ + unsigned ifns; /* Contained loop abstraction functions. */ tree chunk_size; /* Chunk size. */ gcall *head_end; /* Final marker of head sequence. */ }; @@ -20709,6 +20710,7 @@ new_oacc_loop_raw (oacc_loop *parent, lo loop->routine = NULL_TREE; loop->mask = loop->flags = loop->inner = 0; + loop->ifns = 0; loop->chunk_size = 0; loop->head_end = NULL; @@ -20770,6 +20772,9 @@ new_oacc_loop_routine (oacc_loop *parent static oacc_loop * finish_oacc_loop (oacc_loop *loop) { + /* If the loop has been collapsed, don't partition it. */ + if (!loop->ifns) + loop->mask = loop->flags = 0; return loop->parent; } @@ -20900,43 +20905,54 @@ oacc_loop_discover_walk (oacc_loop *loop if (!gimple_call_internal_p (call)) continue; - if (gimple_call_internal_fn (call) != IFN_UNIQUE) - continue; + switch (gimple_call_internal_fn (call)) + { + default: + break; - enum ifn_unique_kind kind - = (enum ifn_unique_kind) TREE_INT_CST_LOW (gimple_call_arg (call, 0)); - if (kind == IFN_UNIQUE_OACC_HEAD_MARK - || kind == IFN_UNIQUE_OACC_TAIL_MARK) - { - if (gimple_call_num_args (call) == 2) - { - gcc_assert (marker && !remaining); - marker = 0; - if (kind == IFN_UNIQUE_OACC_TAIL_MARK) - loop = finish_oacc_loop (loop); - else - loop->head_end = call; - } - else - { - int count = TREE_INT_CST_LOW (gimple_call_arg (call, 2)); + case IFN_GOACC_LOOP: + /* Count the goacc loop abstraction fns, to determine if the + loop was collapsed already. */ + loop->ifns++; + break; - if (!marker) + case IFN_UNIQUE: + enum ifn_unique_kind kind + = (enum ifn_unique_kind) (TREE_INT_CST_LOW + (gimple_call_arg (call, 0))); + if (kind == IFN_UNIQUE_OACC_HEAD_MARK + || kind == IFN_UNIQUE_OACC_TAIL_MARK) + { + if (gimple_call_num_args (call) == 2) { - if (kind == IFN_UNIQUE_OACC_HEAD_MARK) - loop = new_oacc_loop (loop, call); - remaining = count; + gcc_assert (marker && !remaining); + marker = 0; + if (kind == IFN_UNIQUE_OACC_TAIL_MARK) + loop = finish_oacc_loop (loop); + else + loop->head_end = call; } - gcc_assert (count == remaining); - if (remaining) + else { - remaining--; - if (kind == IFN_UNIQUE_OACC_HEAD_MARK) - loop->heads[marker] = call; - else - loop->tails[remaining] = call; + int count = TREE_INT_CST_LOW (gimple_call_arg (call, 2)); + + if (!marker) + { + if (kind == IFN_UNIQUE_OACC_HEAD_MARK) + loop = new_oacc_loop (loop, call); + remaining = count; + } + gcc_assert (count == remaining); + if (remaining) + { + remaining--; + if (kind == IFN_UNIQUE_OACC_HEAD_MARK) + loop->heads[marker] = call; + else + loop->tails[remaining] = call; + } + marker++; } - marker++; } } } @@ -21042,10 +21058,12 @@ oacc_loop_xform_head_tail (gcall *from, determined partitioning mask and chunking argument. */ static void -oacc_loop_xform_loop (gcall *end_marker, tree mask_arg, tree chunk_arg) +oacc_loop_xform_loop (gcall *end_marker, unsigned ifns, + tree mask_arg, tree chunk_arg) { gimple_stmt_iterator gsi = gsi_for_stmt (end_marker); + gcc_checking_assert (ifns); for (;;) { for (; !gsi_end_p (gsi); gsi_next (&gsi)) @@ -21065,13 +21083,13 @@ oacc_loop_xform_loop (gcall *end_marker, *gimple_call_arg_ptr (call, 5) = mask_arg; *gimple_call_arg_ptr (call, 4) = chunk_arg; - if (TREE_INT_CST_LOW (gimple_call_arg (call, 0)) - == IFN_GOACC_LOOP_BOUND) + ifns--; + if (!ifns) return; } - /* If we didn't see LOOP_BOUND, it should be in the single - successor block. */ + /* The LOOP_BOUND ifn, could be in the single successor + block. */ basic_block bb = single_succ (gsi_bb (gsi)); gsi = gsi_start_bb (bb); } @@ -21094,7 +21112,7 @@ oacc_loop_process (oacc_loop *loop) tree mask_arg = build_int_cst (unsigned_type_node, mask); tree chunk_arg = loop->chunk_size; - oacc_loop_xform_loop (loop->head_end, mask_arg, chunk_arg); + oacc_loop_xform_loop (loop->head_end, loop->ifns, mask_arg, chunk_arg); for (ix = 0; ix != GOMP_DIM_MAX && loop->heads[ix]; ix++) { Index: testsuite/c-c++-common/goacc/pr69916.c =================================================================== --- testsuite/c-c++-common/goacc/pr69916.c (nonexistent) +++ testsuite/c-c++-common/goacc/pr69916.c (working copy) @@ -0,0 +1,20 @@ +/* { dg-additional-options "-O2" } */ + +/* PR 69916, an loop determined to be empty sometime after omp-lower + and before oacc-device-lower can evaporate leading to no GOACC_LOOP + internal functions existing. */ + +int +main (void) +{ + +#pragma acc parallel + { + int j = 0; +#pragma acc loop private (j) + for (int i = 0; i < 10; i++) + j++; + } + + return 0; +}