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From: Jakub Jelinek <jakub@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-2658] Disallow pointer operands for |, ^ and partly & [PR106878] Date: Wed, 14 Sep 2022 10:37:27 +0000 (GMT) [thread overview] Message-ID: <20220914103727.9B5063858D37@sourceware.org> (raw) https://gcc.gnu.org/g:645ef01a463f15fc230e2155719c7a12cec89acf commit r13-2658-g645ef01a463f15fc230e2155719c7a12cec89acf Author: Jakub Jelinek <jakub@redhat.com> Date: Wed Sep 14 12:36:36 2022 +0200 Disallow pointer operands for |, ^ and partly & [PR106878] My change to match.pd (that added the two simplifications this patch touches) results in more |/^/& assignments with pointer arguments, but since r12-1608 we reject pointer operands for BIT_NOT_EXPR. Disallowing them for BIT_NOT_EXPR and allowing for BIT_{IOR,XOR,AND}_EXPR leads to a match.pd maintainance nightmare (see one of the patches in the PR), so either we want to allow pointer operand on BIT_NOT_EXPR (but then we run into issues e.g. with the ranger which expects it can emulate BIT_NOT_EXPR ~X as - 1 - X which doesn't work for pointers which don't support MINUS_EXPR), or the following patch disallows pointer arguments for all of BIT_{IOR,XOR,AND}_EXPR with the exception of BIT_AND_EXPR with INTEGER_CST last operand (for simpler pointer realignment). I had to tweak one reassoc optimization and the two match.pd simplifications. 2022-09-14 Jakub Jelinek <jakub@redhat.com> PR tree-optimization/106878 * tree-cfg.cc (verify_gimple_assign_binary): Disallow pointer, reference or OFFSET_TYPE BIT_IOR_EXPR, BIT_XOR_EXPR or, unless the second argument is INTEGER_CST, BIT_AND_EXPR. * match.pd ((type) X op CST -> (type) (X op ((type-x) CST)), (type) (((type2) X) op Y) -> (X op (type) Y)): Punt for POINTER_TYPE_P or OFFSET_TYPE. * tree-ssa-reassoc.cc (optimize_range_tests_cmp_bitwise): For pointers cast them to pointer sized integers first. * gcc.c-torture/compile/pr106878.c: New test. Diff: --- gcc/match.pd | 6 +++++- gcc/testsuite/gcc.c-torture/compile/pr106878.c | 15 +++++++++++++++ gcc/tree-cfg.cc | 20 ++++++++++++++++++-- gcc/tree-ssa-reassoc.cc | 16 +++++++++++++++- 4 files changed, 53 insertions(+), 4 deletions(-) diff --git a/gcc/match.pd b/gcc/match.pd index 17318f523fb..345bcb701a5 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -1763,6 +1763,8 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) && (int_fits_type_p (@1, TREE_TYPE (@0)) || tree_nop_conversion_p (TREE_TYPE (@0), type))) || types_match (@0, @1)) + && !POINTER_TYPE_P (TREE_TYPE (@0)) + && TREE_CODE (TREE_TYPE (@0)) != OFFSET_TYPE /* ??? This transform conflicts with fold-const.cc doing Convert (T)(x & c) into (T)x & (T)c, if c is an integer constants (if x has signed type, the sign bit cannot be set @@ -1799,7 +1801,9 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) (if (GIMPLE && TREE_CODE (@1) != INTEGER_CST && tree_nop_conversion_p (type, TREE_TYPE (@2)) - && types_match (type, @0)) + && types_match (type, @0) + && !POINTER_TYPE_P (TREE_TYPE (@0)) + && TREE_CODE (TREE_TYPE (@0)) != OFFSET_TYPE) (bitop @0 (convert @1))))) (for bitop (bit_and bit_ior) diff --git a/gcc/testsuite/gcc.c-torture/compile/pr106878.c b/gcc/testsuite/gcc.c-torture/compile/pr106878.c new file mode 100644 index 00000000000..c8457189437 --- /dev/null +++ b/gcc/testsuite/gcc.c-torture/compile/pr106878.c @@ -0,0 +1,15 @@ +/* PR tree-optimization/106878 */ + +typedef __INTPTR_TYPE__ intptr_t; +typedef __UINTPTR_TYPE__ uintptr_t; +int a; + +int +foo (const int *c) +{ + uintptr_t d = ((intptr_t) c | (intptr_t) &a) & 65535 << 16; + intptr_t e = (intptr_t) c; + if (d != (e & 65535 << 16)) + return 1; + return 0; +} diff --git a/gcc/tree-cfg.cc b/gcc/tree-cfg.cc index e39d9471220..41ce1b29d17 100644 --- a/gcc/tree-cfg.cc +++ b/gcc/tree-cfg.cc @@ -4167,6 +4167,8 @@ verify_gimple_assign_binary (gassign *stmt) case ROUND_MOD_EXPR: case RDIV_EXPR: case EXACT_DIV_EXPR: + case BIT_IOR_EXPR: + case BIT_XOR_EXPR: /* Disallow pointer and offset types for many of the binary gimple. */ if (POINTER_TYPE_P (lhs_type) || TREE_CODE (lhs_type) == OFFSET_TYPE) @@ -4182,9 +4184,23 @@ verify_gimple_assign_binary (gassign *stmt) case MIN_EXPR: case MAX_EXPR: - case BIT_IOR_EXPR: - case BIT_XOR_EXPR: + /* Continue with generic binary expression handling. */ + break; + case BIT_AND_EXPR: + if (POINTER_TYPE_P (lhs_type) + && TREE_CODE (rhs2) == INTEGER_CST) + break; + /* Disallow pointer and offset types for many of the binary gimple. */ + if (POINTER_TYPE_P (lhs_type) + || TREE_CODE (lhs_type) == OFFSET_TYPE) + { + error ("invalid types for %qs", code_name); + debug_generic_expr (lhs_type); + debug_generic_expr (rhs1_type); + debug_generic_expr (rhs2_type); + return true; + } /* Continue with generic binary expression handling. */ break; diff --git a/gcc/tree-ssa-reassoc.cc b/gcc/tree-ssa-reassoc.cc index e13e2cb308d..f45e552a8cc 100644 --- a/gcc/tree-ssa-reassoc.cc +++ b/gcc/tree-ssa-reassoc.cc @@ -3608,10 +3608,14 @@ optimize_range_tests_cmp_bitwise (enum tree_code opcode, int first, int length, tree type2 = NULL_TREE; bool strict_overflow_p = false; candidates.truncate (0); + if (POINTER_TYPE_P (type1)) + type1 = pointer_sized_int_node; for (j = i; j; j = chains[j - 1]) { tree type = TREE_TYPE (ranges[j - 1].exp); strict_overflow_p |= ranges[j - 1].strict_overflow_p; + if (POINTER_TYPE_P (type)) + type = pointer_sized_int_node; if ((b % 4) == 3) { /* For the signed < 0 cases, the types should be @@ -3642,6 +3646,8 @@ optimize_range_tests_cmp_bitwise (enum tree_code opcode, int first, int length, tree type = TREE_TYPE (ranges[j - 1].exp); if (j == k) continue; + if (POINTER_TYPE_P (type)) + type = pointer_sized_int_node; if ((b % 4) == 3) { if (!useless_type_conversion_p (type1, type)) @@ -3671,7 +3677,7 @@ optimize_range_tests_cmp_bitwise (enum tree_code opcode, int first, int length, op = r->exp; continue; } - if (id == l) + if (id == l || POINTER_TYPE_P (TREE_TYPE (op))) { code = (b % 4) == 3 ? BIT_NOT_EXPR : NOP_EXPR; g = gimple_build_assign (make_ssa_name (type1), code, op); @@ -3695,6 +3701,14 @@ optimize_range_tests_cmp_bitwise (enum tree_code opcode, int first, int length, gimple_seq_add_stmt_without_update (&seq, g); op = gimple_assign_lhs (g); } + type1 = TREE_TYPE (ranges[k - 1].exp); + if (POINTER_TYPE_P (type1)) + { + gimple *g + = gimple_build_assign (make_ssa_name (type1), NOP_EXPR, op); + gimple_seq_add_stmt_without_update (&seq, g); + op = gimple_assign_lhs (g); + } candidates.pop (); if (update_range_test (&ranges[k - 1], NULL, candidates.address (), candidates.length (), opcode, ops, op,
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