diff options
2 files changed, 114 insertions, 160 deletions
diff --git a/toolchain/gcc/patches/11.2.0/001-Revert-Cleanup-range-of-address-calculations.patch b/toolchain/gcc/patches/11.2.0/001-Revert-Cleanup-range-of-address-calculations.patch deleted file mode 100644 index a97e061d6b..0000000000 --- a/toolchain/gcc/patches/11.2.0/001-Revert-Cleanup-range-of-address-calculations.patch +++ /dev/null @@ -1,160 +0,0 @@ -From: Felix Fietkau <nbd@nbd.name> -Date: Tue, 16 Nov 2021 10:39:51 +0100 -Subject: [PATCH] Revert "Cleanup range of address calculations." - -This reverts commit 47923622c663ffad8b14aa93706183290d4f6791. -This commit is causing issues with offset of struct members. - -https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103255 ---- - delete mode 100644 gcc/testsuite/gcc.dg/tree-ssa/pr78655.c - ---- a/gcc/gimple-range.cc -+++ b/gcc/gimple-range.cc -@@ -431,9 +431,8 @@ gimple_ranger::range_of_range_op (irange - m_cache.register_dependency (lhs, op2); - } - -- if (gimple_code (s) == GIMPLE_ASSIGN -- && gimple_assign_rhs_code (s) == ADDR_EXPR) -- return range_of_address (r, s); -+ if (range_of_non_trivial_assignment (r, s)) -+ return true; - - if (range_of_expr (range1, op1, s)) - { -@@ -447,84 +446,48 @@ gimple_ranger::range_of_range_op (irange - return true; - } - --// Calculate the range of an assignment containing an ADDR_EXPR. -+// Calculate the range of a non-trivial assignment. That is, is one -+// inolving arithmetic on an SSA name (for example, an ADDR_EXPR). - // Return the range in R. --// If a range cannot be calculated, set it to VARYING and return true. -+// -+// If a range cannot be calculated, return false. - - bool --gimple_ranger::range_of_address (irange &r, gimple *stmt) -+gimple_ranger::range_of_non_trivial_assignment (irange &r, gimple *stmt) - { -- gcc_checking_assert (gimple_code (stmt) == GIMPLE_ASSIGN); -- gcc_checking_assert (gimple_assign_rhs_code (stmt) == ADDR_EXPR); -+ if (gimple_code (stmt) != GIMPLE_ASSIGN) -+ return false; - -- bool strict_overflow_p; -- tree expr = gimple_assign_rhs1 (stmt); -- poly_int64 bitsize, bitpos; -- tree offset; -- machine_mode mode; -- int unsignedp, reversep, volatilep; -- tree base = get_inner_reference (TREE_OPERAND (expr, 0), &bitsize, -- &bitpos, &offset, &mode, &unsignedp, -- &reversep, &volatilep); -- -- -- if (base != NULL_TREE -- && TREE_CODE (base) == MEM_REF -- && TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME) -+ tree base = gimple_range_base_of_assignment (stmt); -+ if (base) - { -- tree ssa = TREE_OPERAND (base, 0); -- gcc_checking_assert (irange::supports_type_p (TREE_TYPE (ssa))); -- range_of_expr (r, ssa, stmt); -- range_cast (r, TREE_TYPE (gimple_assign_rhs1 (stmt))); -- -- poly_offset_int off = 0; -- bool off_cst = false; -- if (offset == NULL_TREE || TREE_CODE (offset) == INTEGER_CST) -+ if (TREE_CODE (base) == MEM_REF) - { -- off = mem_ref_offset (base); -- if (offset) -- off += poly_offset_int::from (wi::to_poly_wide (offset), -- SIGNED); -- off <<= LOG2_BITS_PER_UNIT; -- off += bitpos; -- off_cst = true; -+ if (TREE_CODE (TREE_OPERAND (base, 0)) == SSA_NAME) -+ { -+ int_range_max range1; -+ tree ssa = TREE_OPERAND (base, 0); -+ if (range_of_expr (range1, ssa, stmt)) -+ { -+ tree type = TREE_TYPE (ssa); -+ range_operator *op = range_op_handler (POINTER_PLUS_EXPR, -+ type); -+ int_range<2> offset (TREE_OPERAND (base, 1), -+ TREE_OPERAND (base, 1)); -+ op->fold_range (r, type, range1, offset); -+ return true; -+ } -+ } -+ return false; - } -- /* If &X->a is equal to X, the range of X is the result. */ -- if (off_cst && known_eq (off, 0)) -- return true; -- else if (flag_delete_null_pointer_checks -- && !TYPE_OVERFLOW_WRAPS (TREE_TYPE (expr))) -- { -- /* For -fdelete-null-pointer-checks -fno-wrapv-pointer we don't -- allow going from non-NULL pointer to NULL. */ -- if(!range_includes_zero_p (&r)) -- return true; -- } -- /* If MEM_REF has a "positive" offset, consider it non-NULL -- always, for -fdelete-null-pointer-checks also "negative" -- ones. Punt for unknown offsets (e.g. variable ones). */ -- if (!TYPE_OVERFLOW_WRAPS (TREE_TYPE (expr)) -- && off_cst -- && known_ne (off, 0) -- && (flag_delete_null_pointer_checks || known_gt (off, 0))) -+ if (gimple_assign_rhs_code (stmt) == ADDR_EXPR) - { -+ // Handle "= &a" and return non-zero. - r = range_nonzero (TREE_TYPE (gimple_assign_rhs1 (stmt))); - return true; - } -- r = int_range<2> (TREE_TYPE (gimple_assign_rhs1 (stmt))); -- return true; -- } -- -- // Handle "= &a". -- if (tree_single_nonzero_warnv_p (expr, &strict_overflow_p)) -- { -- r = range_nonzero (TREE_TYPE (gimple_assign_rhs1 (stmt))); -- return true; - } -- -- // Otherwise return varying. -- r = int_range<2> (TREE_TYPE (gimple_assign_rhs1 (stmt))); -- return true; -+ return false; - } - - // Calculate a range for phi statement S and return it in R. ---- a/gcc/gimple-range.h -+++ b/gcc/gimple-range.h -@@ -62,7 +62,7 @@ protected: - ranger_cache m_cache; - private: - bool range_of_phi (irange &r, gphi *phi); -- bool range_of_address (irange &r, gimple *s); -+ bool range_of_non_trivial_assignment (irange &r, gimple *s); - bool range_of_builtin_call (irange &r, gcall *call); - bool range_with_loop_info (irange &r, tree name); - void range_of_ssa_name_with_loop_info (irange &, tree, class loop *, ---- a/gcc/range-op.cc -+++ b/gcc/range-op.cc -@@ -3447,7 +3447,6 @@ pointer_table::pointer_table () - set (GT_EXPR, op_gt); - set (GE_EXPR, op_ge); - set (SSA_NAME, op_identity); -- set (INTEGER_CST, op_integer_cst); - set (ADDR_EXPR, op_addr); - set (NOP_EXPR, op_convert); - set (CONVERT_EXPR, op_convert); diff --git a/toolchain/gcc/patches/11.2.0/001-v11.3.0-ranger-Fix-up-fold_using_range-range_of_address-PR10.patch b/toolchain/gcc/patches/11.2.0/001-v11.3.0-ranger-Fix-up-fold_using_range-range_of_address-PR10.patch new file mode 100644 index 0000000000..71bbfe5a1d --- /dev/null +++ b/toolchain/gcc/patches/11.2.0/001-v11.3.0-ranger-Fix-up-fold_using_range-range_of_address-PR10.patch @@ -0,0 +1,114 @@ +From a6219e8e0719b14f474b0dcaa7bde2f4e57474f9 Mon Sep 17 00:00:00 2001 +From: Jakub Jelinek <jakub@redhat.com> +Date: Wed, 17 Nov 2021 13:45:53 +0100 +Subject: [PATCH] ranger: Fix up fold_using_range::range_of_address [PR103255] + +If on &base->member the offset isn't constant or isn't zero and +-fdelete-null-pointer-checks and not -fwrapv-pointer and base has a range +that doesn't include NULL, we return the range of the base. +Usually it isn't a big deal, because for most pointers we just use +varying, range_zero and range_nonzero ranges and nothing beyond that, +but if a pointer is initialized from a constant, we actually track the +exact range and in that case this causes miscompilation. +As discussed on IRC, I think doing something like: + offset_int off2; + if (off_cst && off.is_constant (&off2)) + { + tree cst = wide_int_to_tree (sizetype, off2 / BITS_PER_UNIT); + // adjust range r with POINTER_PLUS_EXPR cst + if (!range_includes_zero_p (&r)) + return true; + } + // Fallback + r = range_nonzero (TREE_TYPE (gimple_assign_rhs1 (stmt))); + return true; +could work, given that most of the pointer ranges are just the simple ones +perhaps it is too much for little benefit. + +2021-11-17 Jakub Jelinek <jakub@redhat.com> + + PR tree-optimization/103255 + * gimple-range.cc (fold_using_range::range_of_address): Return + range_nonzero rather than unadjusted base's range. Formatting fixes. + + * gcc.c-torture/execute/pr103255.c: New test. + +(cherry picked from commit c39cb6bf835ca12e590eaa6f90222e51be207c50) +--- + gcc/gimple-range.cc | 16 +++++--- + .../gcc.c-torture/execute/pr103255.c | 41 +++++++++++++++++++ + 2 files changed, 52 insertions(+), 5 deletions(-) + create mode 100644 gcc/testsuite/gcc.c-torture/execute/pr103255.c + +--- a/gcc/gimple-range.cc ++++ b/gcc/gimple-range.cc +@@ -491,14 +491,20 @@ gimple_ranger::range_of_address (irange + } + /* If &X->a is equal to X, the range of X is the result. */ + if (off_cst && known_eq (off, 0)) +- return true; ++ return true; + else if (flag_delete_null_pointer_checks + && !TYPE_OVERFLOW_WRAPS (TREE_TYPE (expr))) + { +- /* For -fdelete-null-pointer-checks -fno-wrapv-pointer we don't +- allow going from non-NULL pointer to NULL. */ +- if(!range_includes_zero_p (&r)) +- return true; ++ /* For -fdelete-null-pointer-checks -fno-wrapv-pointer we don't ++ allow going from non-NULL pointer to NULL. */ ++ if (!range_includes_zero_p (&r)) ++ { ++ /* We could here instead adjust r by off >> LOG2_BITS_PER_UNIT ++ using POINTER_PLUS_EXPR if off_cst and just fall back to ++ this. */ ++ r = range_nonzero (TREE_TYPE (gimple_assign_rhs1 (stmt))); ++ return true; ++ } + } + /* If MEM_REF has a "positive" offset, consider it non-NULL + always, for -fdelete-null-pointer-checks also "negative" +--- /dev/null ++++ b/gcc/testsuite/gcc.c-torture/execute/pr103255.c +@@ -0,0 +1,41 @@ ++/* PR tree-optimization/103255 */ ++ ++struct H ++{ ++ unsigned a; ++ unsigned b; ++ unsigned c; ++}; ++ ++#if __SIZEOF_POINTER__ >= 4 ++#define ADDR 0x400000 ++#else ++#define ADDR 0x4000 ++#endif ++#define OFF 0x20 ++ ++int ++main () ++{ ++ struct H *h = 0; ++ unsigned long o; ++ volatile int t = 1; ++ ++ for (o = OFF; o <= OFF; o += 0x1000) ++ { ++ struct H *u; ++ u = (struct H *) (ADDR + o); ++ if (t) ++ { ++ h = u; ++ break; ++ } ++ } ++ ++ if (h == 0) ++ return 0; ++ unsigned *tt = &h->b; ++ if ((__SIZE_TYPE__) tt != (ADDR + OFF + __builtin_offsetof (struct H, b))) ++ __builtin_abort (); ++ return 0; ++} |