From: Richard Sandiford Date: Tue, 3 Jul 2018 10:03:17 +0000 (+0000) Subject: [15/n] PR85694: Try to split existing casts in widened patterns X-Git-Tag: basepoints/gcc-10~5570 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4ef79c960aa0967cf0298dc496a30a40d86ebd3c;p=thirdparty%2Fgcc.git [15/n] PR85694: Try to split existing casts in widened patterns The main over-widening patch can introduce quite a few extra casts, and in many cases those casts simply "tap into" an intermediate point in an existing extension. E.g. if we have: unsigned char a; int ax = (int) a; and a later operation using ax is shortened to "unsigned short", we would need: unsigned short ax' = (unsigned short) a; The a->ax extension requires one set of unpacks to get to unsigned short and another set of unpacks to get to int. The first set are then duplicated for ax'. If both ax and ax' are needed, the a->ax' extension would end up counting twice during cost calculations. This patch rewrites the original: int ax = (int) a; into a pattern: unsigned short ax' = (unsigned short) a; int ax = (int) ax'; so that each extension only counts once. 2018-07-03 Richard Sandiford gcc/ * tree-vect-patterns.c (vect_split_statement): New function. (vect_convert_input): Use it to try to split an existing cast. gcc/testsuite/ * gcc.dg/vect/vect-over-widen-5.c: Test that the extensions get split into two for use by the over-widening pattern. * gcc.dg/vect/vect-over-widen-6.c: Likewise. * gcc.dg/vect/vect-over-widen-7.c: Likewise. * gcc.dg/vect/vect-over-widen-8.c: Likewise. * gcc.dg/vect/vect-over-widen-9.c: Likewise. * gcc.dg/vect/vect-over-widen-10.c: Likewise. * gcc.dg/vect/vect-over-widen-11.c: Likewise. * gcc.dg/vect/vect-over-widen-12.c: Likewise. * gcc.dg/vect/vect-over-widen-13.c: Likewise. * gcc.dg/vect/vect-over-widen-14.c: Likewise. * gcc.dg/vect/vect-over-widen-15.c: Likewise. * gcc.dg/vect/vect-over-widen-16.c: Likewise. * gcc.dg/vect/vect-over-widen-22.c: New test. From-SVN: r262334 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ab97a84fb0bb..fd928b0a1fd0 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2018-07-03 Richard Sandiford + + * tree-vect-patterns.c (vect_split_statement): New function. + (vect_convert_input): Use it to try to split an existing cast. + 2018-07-03 Richard Sandiford * poly-int.h (print_hex): New function. diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 0028d4f88ace..90aa4d7e22a3 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,20 @@ +2018-07-03 Richard Sandiford + + * gcc.dg/vect/vect-over-widen-5.c: Test that the extensions + get split into two for use by the over-widening pattern. + * gcc.dg/vect/vect-over-widen-6.c: Likewise. + * gcc.dg/vect/vect-over-widen-7.c: Likewise. + * gcc.dg/vect/vect-over-widen-8.c: Likewise. + * gcc.dg/vect/vect-over-widen-9.c: Likewise. + * gcc.dg/vect/vect-over-widen-10.c: Likewise. + * gcc.dg/vect/vect-over-widen-11.c: Likewise. + * gcc.dg/vect/vect-over-widen-12.c: Likewise. + * gcc.dg/vect/vect-over-widen-13.c: Likewise. + * gcc.dg/vect/vect-over-widen-14.c: Likewise. + * gcc.dg/vect/vect-over-widen-15.c: Likewise. + * gcc.dg/vect/vect-over-widen-16.c: Likewise. + * gcc.dg/vect/vect-over-widen-22.c: New test. + 2018-07-03 Richard Sandiford * gcc.dg/vect/vect-widen-mult-u8-u32.c: Check specifically for a diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-10.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-10.c index 394a5a19e0d5..f0140e4ef6d7 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-10.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-10.c @@ -11,6 +11,7 @@ #include "vect-over-widen-9.c" +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-11.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-11.c index 97ab57f12c43..222d854b2d6e 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-11.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-11.c @@ -55,6 +55,7 @@ main (void) return 0; } +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-12.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-12.c index 0d5473ea1668..ddb3bd8c0d37 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-12.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-12.c @@ -11,6 +11,7 @@ #include "vect-over-widen-11.c" +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-13.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-13.c index b89ed8bf4a7d..b25db881afbc 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-13.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-13.c @@ -43,6 +43,7 @@ main (void) return 0; } +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* / 2} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* = \(signed char\)} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-14.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-14.c index 7b5ba2311a07..dfa09f5d2caf 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-14.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-14.c @@ -11,6 +11,7 @@ #include "vect-over-widen-13.c" +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* = \(unsigned char\)} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-15.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-15.c index e898e87fd0bc..d31050ee926a 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-15.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-15.c @@ -45,6 +45,7 @@ main (void) return 0; } +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* / 2} "vect" } } */ /* { dg-final { scan-tree-dump-not {vect_recog_cast_forwprop_pattern: detected} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-16.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-16.c index 04293454d32b..4584c586da1e 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-16.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-16.c @@ -11,6 +11,7 @@ #include "vect-over-widen-15.c" +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */ /* { dg-final { scan-tree-dump-not {vect_recog_cast_forwprop_pattern: detected} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-22.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-22.c new file mode 100644 index 000000000000..187bdf159fea --- /dev/null +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-22.c @@ -0,0 +1,53 @@ +/* { dg-require-effective-target vect_int } */ +/* { dg-require-effective-target vect_shift } */ +/* { dg-require-effective-target vect_pack_trunc } */ +/* { dg-require-effective-target vect_unpack } */ + +#include "tree-vect.h" + +#define N 111 + +/* The addition should be narrowed to short. */ + +void __attribute__ ((noipa)) +f (unsigned int *restrict a, unsigned int *restrict b, + unsigned short *restrict c, unsigned char *restrict d, unsigned int e) +{ + e &= 0xff; + for (__INTPTR_TYPE__ i = 0; i < N; ++i) + { + unsigned int xor = d[i] ^ e; + a[i] = c[i] | xor; + b[i] = xor; + } +} + +int +main (void) +{ + check_vect (); + + unsigned int a[N], b[N]; + unsigned short c[N]; + unsigned char d[N]; + for (int i = 0; i < N; ++i) + { + c[i] = i * 11; + d[i] = i * 2 + 3; + asm volatile ("" ::: "memory"); + } + f (a, b, c, d, 0x73); + for (int i = 0; i < N; ++i) + if (b[i] != ((i * 2 + 3) ^ 0x73) + || a[i] != ((i * 11) | b[i])) + __builtin_abort (); + + return 0; +} + +/* { dg-final { scan-tree-dump {Splitting pattern statement} "vect" } } */ +/* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \^} "vect" } } */ +/* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \|} "vect" } } */ +/* { dg-final { scan-tree-dump {demoting [^\n]* to [^\n]*char} "vect" } } */ +/* { dg-final { scan-tree-dump {demoting [^\n]* to [^\n]*short} "vect" } } */ +/* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-5.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-5.c index 56d2396e3940..269df5387d20 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-5.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-5.c @@ -44,6 +44,7 @@ main (void) return 0; } +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-6.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-6.c index 9fe0e056cc4e..bda92c965e08 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-6.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-6.c @@ -9,6 +9,7 @@ #include "vect-over-widen-5.c" +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(unsigned char\)} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-7.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-7.c index a8166b385056..314a6828c53c 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-7.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-7.c @@ -46,6 +46,7 @@ main (void) return 0; } +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-8.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-8.c index 238f577adea9..553c0712a79a 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-8.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-8.c @@ -12,6 +12,7 @@ #include "vect-over-widen-7.c" +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(unsigned char\)} "vect" } } */ diff --git a/gcc/testsuite/gcc.dg/vect/vect-over-widen-9.c b/gcc/testsuite/gcc.dg/vect/vect-over-widen-9.c index a50f8198bfd5..5baba09a575f 100644 --- a/gcc/testsuite/gcc.dg/vect/vect-over-widen-9.c +++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-9.c @@ -50,6 +50,7 @@ main (void) return 0; } +/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */ /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */ diff --git a/gcc/tree-vect-patterns.c b/gcc/tree-vect-patterns.c index 91076f41964b..a1649d8b0fec 100644 --- a/gcc/tree-vect-patterns.c +++ b/gcc/tree-vect-patterns.c @@ -634,6 +634,97 @@ vect_recog_temp_ssa_var (tree type, gimple *stmt) return make_temp_ssa_name (type, stmt, "patt"); } +/* STMT2_INFO describes a type conversion that could be split into STMT1 + followed by a version of STMT2_INFO that takes NEW_RHS as its first + input. Try to do this using pattern statements, returning true on + success. */ + +static bool +vect_split_statement (stmt_vec_info stmt2_info, tree new_rhs, + gimple *stmt1, tree vectype) +{ + if (is_pattern_stmt_p (stmt2_info)) + { + /* STMT2_INFO is part of a pattern. Get the statement to which + the pattern is attached. */ + stmt_vec_info orig_stmt2_info + = vinfo_for_stmt (STMT_VINFO_RELATED_STMT (stmt2_info)); + vect_init_pattern_stmt (stmt1, orig_stmt2_info, vectype); + + if (dump_enabled_p ()) + { + dump_printf_loc (MSG_NOTE, vect_location, + "Splitting pattern statement: "); + dump_gimple_stmt (MSG_NOTE, TDF_SLIM, stmt2_info->stmt, 0); + } + + /* Since STMT2_INFO is a pattern statement, we can change it + in-situ without worrying about changing the code for the + containing block. */ + gimple_assign_set_rhs1 (stmt2_info->stmt, new_rhs); + + if (dump_enabled_p ()) + { + dump_printf_loc (MSG_NOTE, vect_location, "into: "); + dump_gimple_stmt (MSG_NOTE, TDF_SLIM, stmt1, 0); + dump_printf_loc (MSG_NOTE, vect_location, "and: "); + dump_gimple_stmt (MSG_NOTE, TDF_SLIM, stmt2_info->stmt, 0); + } + + gimple_seq *def_seq = &STMT_VINFO_PATTERN_DEF_SEQ (orig_stmt2_info); + if (STMT_VINFO_RELATED_STMT (orig_stmt2_info) == stmt2_info->stmt) + /* STMT2_INFO is the actual pattern statement. Add STMT1 + to the end of the definition sequence. */ + gimple_seq_add_stmt_without_update (def_seq, stmt1); + else + { + /* STMT2_INFO belongs to the definition sequence. Insert STMT1 + before it. */ + gimple_stmt_iterator gsi = gsi_for_stmt (stmt2_info->stmt, def_seq); + gsi_insert_before_without_update (&gsi, stmt1, GSI_SAME_STMT); + } + return true; + } + else + { + /* STMT2_INFO doesn't yet have a pattern. Try to create a + two-statement pattern now. */ + gcc_assert (!STMT_VINFO_RELATED_STMT (stmt2_info)); + tree lhs_type = TREE_TYPE (gimple_get_lhs (stmt2_info->stmt)); + tree lhs_vectype = get_vectype_for_scalar_type (lhs_type); + if (!lhs_vectype) + return false; + + if (dump_enabled_p ()) + { + dump_printf_loc (MSG_NOTE, vect_location, + "Splitting statement: "); + dump_gimple_stmt (MSG_NOTE, TDF_SLIM, stmt2_info->stmt, 0); + } + + /* Add STMT1 as a singleton pattern definition sequence. */ + gimple_seq *def_seq = &STMT_VINFO_PATTERN_DEF_SEQ (stmt2_info); + vect_init_pattern_stmt (stmt1, stmt2_info, vectype); + gimple_seq_add_stmt_without_update (def_seq, stmt1); + + /* Build the second of the two pattern statements. */ + tree new_lhs = vect_recog_temp_ssa_var (lhs_type, NULL); + gassign *new_stmt2 = gimple_build_assign (new_lhs, NOP_EXPR, new_rhs); + vect_set_pattern_stmt (new_stmt2, stmt2_info, lhs_vectype); + + if (dump_enabled_p ()) + { + dump_printf_loc (MSG_NOTE, vect_location, + "into pattern statements: "); + dump_gimple_stmt (MSG_NOTE, TDF_SLIM, stmt1, 0); + dump_printf_loc (MSG_NOTE, vect_location, "and: "); + dump_gimple_stmt (MSG_NOTE, TDF_SLIM, new_stmt2, 0); + } + + return true; + } +} + /* Convert UNPROM to TYPE and return the result, adding new statements to STMT_INFO's pattern definition statements if no better way is available. VECTYPE is the vector form of TYPE. */ @@ -662,6 +753,18 @@ vect_convert_input (stmt_vec_info stmt_info, tree type, tree new_op = vect_recog_temp_ssa_var (type, NULL); gassign *new_stmt = gimple_build_assign (new_op, NOP_EXPR, unprom->op); + /* If the operation is the input to a vectorizable cast, try splitting + that cast into two, taking the required result as a mid-way point. */ + if (unprom->caster) + { + tree lhs = gimple_get_lhs (unprom->caster->stmt); + if (TYPE_PRECISION (TREE_TYPE (lhs)) > TYPE_PRECISION (type) + && TYPE_PRECISION (type) > TYPE_PRECISION (unprom->type) + && (TYPE_UNSIGNED (unprom->type) || !TYPE_UNSIGNED (type)) + && vect_split_statement (unprom->caster, new_op, new_stmt, vectype)) + return new_op; + } + /* If OP is an external value, see if we can insert the new statement on an incoming edge. */ if (unprom->dt == vect_external_def)