From: Alan Lawrence Date: Fri, 18 Sep 2015 10:55:11 +0000 (+0000) Subject: completely_scalarize arrays as well as records. X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d0f4e7fcdbde6134337c5956a23a740a26a4af66;p=gcc.git completely_scalarize arrays as well as records. gcc/: PR tree-optimization/67283 * tree-sra.c (type_consists_of_records_p): Rename to... (scalarizable_type_p): ...this, add case for ARRAY_TYPE. (completely_scalarize_record): Rename to... (completely_scalarize): ...this, add ARRAY_TYPE case, move some code to: (scalarize_elem): New. (analyze_all_variable_accesses): Follow renamings. gcc/testsuite/: * gcc.dg/tree-ssa/sra-15.c: New. * gcc.dg/tree-ssa/sra-16.c: New. From-SVN: r227901 --- diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 5b7ffa6e86c..dddd0f3e9f3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,13 @@ +2015-09-18 Alan Lawrence + + PR tree-optimization/67283 + * tree-sra.c (type_consists_of_records_p): Rename to... + (scalarizable_type_p): ...this, add case for ARRAY_TYPE. + (completely_scalarize_record): Rename to... + (completely_scalarize): ...this, add ARRAY_TYPE case, move some code to: + (scalarize_elem): New. + (analyze_all_variable_accesses): Follow renamings. + 2015-09-18 Richard Biener * dwarf2out.c (add_location_or_const_value_attribute): Do nothing diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 904a40a64be..08baed1ef3f 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,9 @@ +2015-09-18 Alan Lawrence + + PR tree-optimization/67283 + * gcc.dg/tree-ssa/sra-15.c: New. + * gcc.dg/tree-ssa/sra-16.c: New. + 2015-09-17 Bernd Edlinger PR sanitizer/64078 diff --git a/gcc/testsuite/gcc.dg/tree-ssa/sra-15.c b/gcc/testsuite/gcc.dg/tree-ssa/sra-15.c new file mode 100644 index 00000000000..a22062e32d1 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/sra-15.c @@ -0,0 +1,37 @@ +/* Verify that SRA total scalarization works on records containing arrays. */ +/* { dg-do run } */ +/* { dg-options "-O1 -fdump-tree-release_ssa --param sra-max-scalarization-size-Ospeed=32" } */ + +extern void abort (void); + +struct S +{ + char c; + unsigned short f[2][2]; + int i; + unsigned short f3, f4; +}; + + +int __attribute__ ((noinline)) +foo (struct S *p) +{ + struct S l; + + l = *p; + l.i++; + l.f[1][0] += 3; + *p = l; +} + +int +main (int argc, char **argv) +{ + struct S a = {0, { {5, 7}, {9, 11} }, 4, 0, 0}; + foo (&a); + if (a.i != 5 || a.f[1][0] != 12) + abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "l;" 0 "release_ssa" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/sra-16.c b/gcc/testsuite/gcc.dg/tree-ssa/sra-16.c new file mode 100644 index 00000000000..fef34c0d827 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/sra-16.c @@ -0,0 +1,37 @@ +/* Verify that SRA total scalarization works on records containing arrays. */ +/* { dg-do run } */ +/* { dg-options "-O1 -fdump-tree-release_ssa --param sra-max-scalarization-size-Ospeed=16" } */ + +extern void abort (void); + +struct S +{ + long zilch[0]; + char c; + int i; + unsigned short f3, f4; +}; + + +int __attribute__ ((noinline)) +foo (struct S *p) +{ + struct S l; + + l = *p; + l.i++; + l.f3++; + *p = l; +} + +int +main (int argc, char **argv) +{ + struct S a = { { }, 0, 4, 0, 0}; + foo (&a); + if (a.i != 5 || a.f3 != 1) + abort (); + return 0; +} + +/* { dg-final { scan-tree-dump-times "l;" 0 "release_ssa" } } */ diff --git a/gcc/tree-sra.c b/gcc/tree-sra.c index 94fea2e3cac..ec5edd35f08 100644 --- a/gcc/tree-sra.c +++ b/gcc/tree-sra.c @@ -915,73 +915,142 @@ create_access (tree expr, gimple stmt, bool write) } -/* Return true iff TYPE is a RECORD_TYPE with fields that are either of gimple - register types or (recursively) records with only these two kinds of fields. - It also returns false if any of these records contains a bit-field. */ +/* Return true iff TYPE is scalarizable - i.e. a RECORD_TYPE or fixed-length + ARRAY_TYPE with fields that are either of gimple register types (excluding + bit-fields) or (recursively) scalarizable types. */ static bool -type_consists_of_records_p (tree type) +scalarizable_type_p (tree type) { - tree fld; + gcc_assert (!is_gimple_reg_type (type)); - if (TREE_CODE (type) != RECORD_TYPE) - return false; + switch (TREE_CODE (type)) + { + case RECORD_TYPE: + for (tree fld = TYPE_FIELDS (type); fld; fld = DECL_CHAIN (fld)) + if (TREE_CODE (fld) == FIELD_DECL) + { + tree ft = TREE_TYPE (fld); - for (fld = TYPE_FIELDS (type); fld; fld = DECL_CHAIN (fld)) - if (TREE_CODE (fld) == FIELD_DECL) - { - tree ft = TREE_TYPE (fld); + if (DECL_BIT_FIELD (fld)) + return false; - if (DECL_BIT_FIELD (fld)) - return false; + if (!is_gimple_reg_type (ft) + && !scalarizable_type_p (ft)) + return false; + } - if (!is_gimple_reg_type (ft) - && !type_consists_of_records_p (ft)) - return false; - } + return true; - return true; + case ARRAY_TYPE: + { + if (TYPE_DOMAIN (type) == NULL_TREE + || !tree_fits_shwi_p (TYPE_SIZE (type)) + || !tree_fits_shwi_p (TYPE_SIZE (TREE_TYPE (type))) + || (tree_to_shwi (TYPE_SIZE (TREE_TYPE (type))) <= 0) + || !tree_fits_shwi_p (TYPE_MIN_VALUE (TYPE_DOMAIN (type)))) + return false; + if (tree_to_shwi (TYPE_SIZE (type)) == 0 + && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) == NULL_TREE) + /* Zero-element array, should not prevent scalarization. */ + ; + else if ((tree_to_shwi (TYPE_SIZE (type)) <= 0) + || !tree_fits_shwi_p (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))) + return false; + + tree elem = TREE_TYPE (type); + if (!is_gimple_reg_type (elem) + && !scalarizable_type_p (elem)) + return false; + return true; + } + default: + return false; + } } -/* Create total_scalarization accesses for all scalar type fields in DECL that - must be of a RECORD_TYPE conforming to type_consists_of_records_p. BASE - must be the top-most VAR_DECL representing the variable, OFFSET must be the - offset of DECL within BASE. REF must be the memory reference expression for - the given decl. */ +static void scalarize_elem (tree, HOST_WIDE_INT, HOST_WIDE_INT, tree, tree); + +/* Create total_scalarization accesses for all scalar fields of a member + of type DECL_TYPE conforming to scalarizable_type_p. BASE + must be the top-most VAR_DECL representing the variable; within that, + OFFSET locates the member and REF must be the memory reference expression for + the member. */ static void -completely_scalarize_record (tree base, tree decl, HOST_WIDE_INT offset, - tree ref) +completely_scalarize (tree base, tree decl_type, HOST_WIDE_INT offset, tree ref) { - tree fld, decl_type = TREE_TYPE (decl); + switch (TREE_CODE (decl_type)) + { + case RECORD_TYPE: + for (tree fld = TYPE_FIELDS (decl_type); fld; fld = DECL_CHAIN (fld)) + if (TREE_CODE (fld) == FIELD_DECL) + { + HOST_WIDE_INT pos = offset + int_bit_position (fld); + tree ft = TREE_TYPE (fld); + tree nref = build3 (COMPONENT_REF, ft, ref, fld, NULL_TREE); - for (fld = TYPE_FIELDS (decl_type); fld; fld = DECL_CHAIN (fld)) - if (TREE_CODE (fld) == FIELD_DECL) + scalarize_elem (base, pos, tree_to_uhwi (DECL_SIZE (fld)), nref, + ft); + } + break; + case ARRAY_TYPE: { - HOST_WIDE_INT pos = offset + int_bit_position (fld); - tree ft = TREE_TYPE (fld); - tree nref = build3 (COMPONENT_REF, TREE_TYPE (fld), ref, fld, - NULL_TREE); - - if (is_gimple_reg_type (ft)) + tree elemtype = TREE_TYPE (decl_type); + tree elem_size = TYPE_SIZE (elemtype); + gcc_assert (elem_size && tree_fits_shwi_p (elem_size)); + HOST_WIDE_INT el_size = tree_to_shwi (elem_size); + gcc_assert (el_size > 0); + + tree minidx = TYPE_MIN_VALUE (TYPE_DOMAIN (decl_type)); + gcc_assert (TREE_CODE (minidx) == INTEGER_CST); + tree maxidx = TYPE_MAX_VALUE (TYPE_DOMAIN (decl_type)); + if (maxidx) { - struct access *access; - HOST_WIDE_INT size; - - size = tree_to_uhwi (DECL_SIZE (fld)); - access = create_access_1 (base, pos, size); - access->expr = nref; - access->type = ft; - access->grp_total_scalarization = 1; - /* Accesses for intraprocedural SRA can have their stmt NULL. */ + gcc_assert (TREE_CODE (maxidx) == INTEGER_CST); + /* MINIDX and MAXIDX are inclusive. Try to avoid overflow. */ + unsigned HOST_WIDE_INT lenp1 = tree_to_shwi (maxidx) + - tree_to_shwi (minidx); + unsigned HOST_WIDE_INT idx = 0; + do + { + tree nref = build4 (ARRAY_REF, elemtype, ref, size_int (idx), + NULL_TREE, NULL_TREE); + int el_off = offset + idx * el_size; + scalarize_elem (base, el_off, el_size, nref, elemtype); + } + while (++idx <= lenp1); } - else - completely_scalarize_record (base, fld, pos, nref); } + break; + default: + gcc_unreachable (); + } +} + +/* Create total_scalarization accesses for a member of type TYPE, which must + satisfy either is_gimple_reg_type or scalarizable_type_p. BASE must be the + top-most VAR_DECL representing the variable; within that, POS and SIZE locate + the member and REF must be the reference expression for it. */ + +static void +scalarize_elem (tree base, HOST_WIDE_INT pos, HOST_WIDE_INT size, + tree ref, tree type) +{ + if (is_gimple_reg_type (type)) + { + struct access *access = create_access_1 (base, pos, size); + access->expr = ref; + access->type = type; + access->grp_total_scalarization = 1; + /* Accesses for intraprocedural SRA can have their stmt NULL. */ + } + else + completely_scalarize (base, type, pos, ref); } /* Create a total_scalarization access for VAR as a whole. VAR must be of a - RECORD_TYPE conforming to type_consists_of_records_p. */ + RECORD_TYPE or ARRAY_TYPE conforming to scalarizable_type_p. */ static void create_total_scalarization_access (tree var) @@ -2521,13 +2590,13 @@ analyze_all_variable_accesses (void) tree var = candidate (i); if (TREE_CODE (var) == VAR_DECL - && type_consists_of_records_p (TREE_TYPE (var))) + && scalarizable_type_p (TREE_TYPE (var))) { if (tree_to_uhwi (TYPE_SIZE (TREE_TYPE (var))) <= max_scalarization_size) { create_total_scalarization_access (var); - completely_scalarize_record (var, var, 0, var); + completely_scalarize (var, TREE_TYPE (var), 0, var); if (dump_file && (dump_flags & TDF_DETAILS)) { fprintf (dump_file, "Will attempt to totally scalarize ");