[TCWG CI] Regression caused by gcc: tree-optimization/102570 - teach VN about internal functions: commit 55a3be2f5255d69e740d61b2c5aaba1ccbc643b8 Author: Richard Biener rguenther@suse.de

tree-optimization/102570 - teach VN about internal functions

Results regressed to # reset_artifacts: -10 # build_abe binutils: -9 # build_abe stage1: -5 # build_abe qemu: -2 # linux_n_obj: 18360 # First few build errors in logs: # 00:01:21 ./include/linux/arm-smccc.h:460:40: error: ‘res.a0’ is used uninitialized [-Werror=uninitialized] # 00:01:21 ./include/linux/arm-smccc.h:460:40: error: ‘res.a0’ is used uninitialized [-Werror=uninitialized] # 00:01:21 ./include/linux/arm-smccc.h:460:40: error: ‘res.a0’ is used uninitialized [-Werror=uninitialized] # 00:01:21 make[2]: *** [scripts/Makefile.build:288: arch/arm64/hyperv/hv_core.o] Error 1 # 00:01:22 crypto/asymmetric_keys/asymmetric_type.c:481:15: error: ‘restrict_method’ is used uninitialized [-Werror=uninitialized] # 00:01:22 make[2]: *** [scripts/Makefile.build:288: crypto/asymmetric_keys/asymmetric_type.o] Error 1 # 00:01:22 ./include/trace/perf.h:38:25: error: ‘entry’ is used uninitialized [-Werror=uninitialized] # 00:01:22 ./include/trace/perf.h:44:13: error: ‘__entry_size’ is used uninitialized [-Werror=uninitialized] # 00:01:23 security/keys/encrypted-keys/encrypted.c:660:19: error: ‘mkey’ is used uninitialized [-Werror=uninitialized] # 00:01:23 security/keys/encrypted-keys/encrypted.c:905:19: error: ‘epayload’ is used uninitialized [-Werror=uninitialized]

from # reset_artifacts: -10 # build_abe binutils: -9 # build_abe stage1: -5 # build_abe qemu: -2 # linux_n_obj: 21404

THIS IS THE END OF INTERESTING STUFF. BELOW ARE LINKS TO BUILDS, REPRODUCTION INSTRUCTIONS, AND THE RAW COMMIT.

This commit has regressed these CI configurations: - tcwg_kernel/gnu-master-aarch64-next-allmodconfig

First_bad build: https://ci.linaro.org/job/tcwg_kernel-gnu-bisect-gnu-master-aarch64-next-all... Last_good build: https://ci.linaro.org/job/tcwg_kernel-gnu-bisect-gnu-master-aarch64-next-all... Baseline build: https://ci.linaro.org/job/tcwg_kernel-gnu-bisect-gnu-master-aarch64-next-all... Even more details: https://ci.linaro.org/job/tcwg_kernel-gnu-bisect-gnu-master-aarch64-next-all...

Reproduce builds: <cut> mkdir investigate-gcc-55a3be2f5255d69e740d61b2c5aaba1ccbc643b8 cd investigate-gcc-55a3be2f5255d69e740d61b2c5aaba1ccbc643b8

# Fetch scripts git clone https://git.linaro.org/toolchain/jenkins-scripts

# Fetch manifests and test.sh script mkdir -p artifacts/manifests curl -o artifacts/manifests/build-baseline.sh https://ci.linaro.org/job/tcwg_kernel-gnu-bisect-gnu-master-aarch64-next-all... --fail curl -o artifacts/manifests/build-parameters.sh https://ci.linaro.org/job/tcwg_kernel-gnu-bisect-gnu-master-aarch64-next-all... --fail curl -o artifacts/test.sh https://ci.linaro.org/job/tcwg_kernel-gnu-bisect-gnu-master-aarch64-next-all... --fail chmod +x artifacts/test.sh

# Reproduce the baseline build (build all pre-requisites) ./jenkins-scripts/tcwg_kernel-build.sh @@ artifacts/manifests/build-baseline.sh

# Save baseline build state (which is then restored in artifacts/test.sh) mkdir -p ./bisect rsync -a --del --delete-excluded --exclude /bisect/ --exclude /artifacts/ --exclude /gcc/ ./ ./bisect/baseline/

cd gcc

# Reproduce first_bad build git checkout --detach 55a3be2f5255d69e740d61b2c5aaba1ccbc643b8 ../artifacts/test.sh

# Reproduce last_good build git checkout --detach 22d34a2a50651d01669b6fbcdb9677c18d2197c5 ../artifacts/test.sh

cd .. </cut>

Full commit (up to 1000 lines): <cut> commit 55a3be2f5255d69e740d61b2c5aaba1ccbc643b8 Author: Richard Biener rguenther@suse.de Date: Mon Oct 4 10:57:45 2021 +0200

tree-optimization/102570 - teach VN about internal functions

We're now using internal functions for a lot of stuff but there's still missing VN support out of laziness. The following instantiates support and adds testcases for FRE and PRE (hoisting).

2021-10-04 Richard Biener rguenther@suse.de

PR tree-optimization/102570 * tree-ssa-sccvn.h (vn_reference_op_struct): Document we are using clique for the internal function code. * tree-ssa-sccvn.c (vn_reference_op_eq): Compare the internal function code. (print_vn_reference_ops): Print the internal function code. (vn_reference_op_compute_hash): Hash it. (copy_reference_ops_from_call): Record it. (visit_stmt): Remove the restriction around internal function calls. (fully_constant_vn_reference_p): Use fold_const_call and handle internal functions. (vn_reference_eq): Compare call return types. * tree-ssa-pre.c (create_expression_by_pieces): Handle generating calls to internal functions. (compute_avail): Remove the restriction around internal function calls.

* gcc.dg/tree-ssa/ssa-fre-96.c: New testcase. * gcc.dg/tree-ssa/ssa-pre-33.c: Likewise. --- gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-96.c | 14 +++++ gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-33.c | 15 +++++ gcc/tree-ssa-pre.c | 27 +++++---- gcc/tree-ssa-sccvn.c | 91 ++++++++++++++++++------------ gcc/tree-ssa-sccvn.h | 3 +- 5 files changed, 103 insertions(+), 47 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-96.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-96.c new file mode 100644 index 00000000000..fd1d5713b5f --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-96.c @@ -0,0 +1,14 @@ +/* { dg-do compile } */ +/* { dg-options "-O -fdump-tree-fre1" } */ + +_Bool f1(unsigned x, unsigned y, unsigned *res) +{ + _Bool t = __builtin_add_overflow(x, y, res); + unsigned res1; + _Bool t1 = __builtin_add_overflow(x, y, &res1); + *res -= res1; + return t==t1; +} + +/* { dg-final { scan-tree-dump-times "ADD_OVERFLOW" 1 "fre1" } } */ +/* { dg-final { scan-tree-dump "return 1;" "fre1" } } */ diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-33.c b/gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-33.c new file mode 100644 index 00000000000..3b3bd629bc2 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-33.c @@ -0,0 +1,15 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-pre" } */ + +_Bool f1(unsigned x, unsigned y, unsigned *res, int flag, _Bool *t) +{ + if (flag) + *t = __builtin_add_overflow(x, y, res); + unsigned res1; + _Bool t1 = __builtin_add_overflow(x, y, &res1); + *res -= res1; + return *t==t1; +} + +/* We should hoist the .ADD_OVERFLOW to before the check. */ +/* { dg-final { scan-tree-dump-times "ADD_OVERFLOW" 1 "pre" } } */ diff --git a/gcc/tree-ssa-pre.c b/gcc/tree-ssa-pre.c index 08755847f66..1cc1aae694f 100644 --- a/gcc/tree-ssa-pre.c +++ b/gcc/tree-ssa-pre.c @@ -2855,9 +2855,13 @@ create_expression_by_pieces (basic_block block, pre_expr expr, unsigned int operand = 1; vn_reference_op_t currop = &ref->operands[0]; tree sc = NULL_TREE; - tree fn = find_or_generate_expression (block, currop->op0, stmts); - if (!fn) - return NULL_TREE; + tree fn = NULL_TREE; + if (currop->op0) + { + fn = find_or_generate_expression (block, currop->op0, stmts); + if (!fn) + return NULL_TREE; + } if (currop->op1) { sc = find_or_generate_expression (block, currop->op1, stmts); @@ -2873,12 +2877,19 @@ create_expression_by_pieces (basic_block block, pre_expr expr, return NULL_TREE; args.quick_push (arg); } - gcall *call = gimple_build_call_vec (fn, args); + gcall *call; + if (currop->op0) + { + call = gimple_build_call_vec (fn, args); + gimple_call_set_fntype (call, currop->type); + } + else + call = gimple_build_call_internal_vec ((internal_fn)currop->clique, + args); gimple_set_location (call, expr->loc); - gimple_call_set_fntype (call, currop->type); if (sc) gimple_call_set_chain (call, sc); - tree forcedname = make_ssa_name (TREE_TYPE (currop->type)); + tree forcedname = make_ssa_name (ref->type); gimple_call_set_lhs (call, forcedname); /* There's no CCP pass after PRE which would re-compute alignment information so make sure we re-materialize this here. */ @@ -4004,10 +4015,6 @@ compute_avail (function *fun) vn_reference_s ref1; pre_expr result = NULL;

- /* We can value number only calls to real functions. */ - if (gimple_call_internal_p (stmt)) - continue; - vn_reference_lookup_call (as_a <gcall *> (stmt), &ref, &ref1); /* There is no point to PRE a call without a value. */ if (!ref || !ref->result) diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c index 416a5252144..0d942218279 100644 --- a/gcc/tree-ssa-sccvn.c +++ b/gcc/tree-ssa-sccvn.c @@ -70,6 +70,7 @@ along with GCC; see the file COPYING3. If not see #include "tree-scalar-evolution.h" #include "tree-ssa-loop-niter.h" #include "builtins.h" +#include "fold-const-call.h" #include "tree-ssa-sccvn.h"

/* This algorithm is based on the SCC algorithm presented by Keith @@ -212,7 +213,8 @@ vn_reference_op_eq (const void *p1, const void *p2) TYPE_MAIN_VARIANT (vro2->type)))) && expressions_equal_p (vro1->op0, vro2->op0) && expressions_equal_p (vro1->op1, vro2->op1) - && expressions_equal_p (vro1->op2, vro2->op2)); + && expressions_equal_p (vro1->op2, vro2->op2) + && (vro1->opcode != CALL_EXPR || vro1->clique == vro2->clique)); }

/* Free a reference operation structure VP. */ @@ -264,15 +266,18 @@ print_vn_reference_ops (FILE *outfile, const vec<vn_reference_op_s> ops) && TREE_CODE_CLASS (vro->opcode) != tcc_declaration) { fprintf (outfile, "%s", get_tree_code_name (vro->opcode)); - if (vro->op0) + if (vro->op0 || vro->opcode == CALL_EXPR) { fprintf (outfile, "<"); closebrace = true; } } - if (vro->op0) + if (vro->op0 || vro->opcode == CALL_EXPR) { - print_generic_expr (outfile, vro->op0); + if (!vro->op0) + fprintf (outfile, internal_fn_name ((internal_fn)vro->clique)); + else + print_generic_expr (outfile, vro->op0); if (vro->op1) { fprintf (outfile, ","); @@ -684,6 +689,8 @@ static void vn_reference_op_compute_hash (const vn_reference_op_t vro1, inchash::hash &hstate) { hstate.add_int (vro1->opcode); + if (vro1->opcode == CALL_EXPR && !vro1->op0) + hstate.add_int (vro1->clique); if (vro1->op0) inchash::add_expr (vro1->op0, hstate); if (vro1->op1) @@ -769,11 +776,16 @@ vn_reference_eq (const_vn_reference_t const vr1, const_vn_reference_t const vr2) if (vr1->type != vr2->type) return false; } + else if (vr1->type == vr2->type) + ; else if (COMPLETE_TYPE_P (vr1->type) != COMPLETE_TYPE_P (vr2->type) || (COMPLETE_TYPE_P (vr1->type) && !expressions_equal_p (TYPE_SIZE (vr1->type), TYPE_SIZE (vr2->type)))) return false; + else if (vr1->operands[0].opcode == CALL_EXPR + && !types_compatible_p (vr1->type, vr2->type)) + return false; else if (INTEGRAL_TYPE_P (vr1->type) && INTEGRAL_TYPE_P (vr2->type)) { @@ -1270,6 +1282,8 @@ copy_reference_ops_from_call (gcall *call, temp.type = gimple_call_fntype (call); temp.opcode = CALL_EXPR; temp.op0 = gimple_call_fn (call); + if (gimple_call_internal_p (call)) + temp.clique = gimple_call_internal_fn (call); temp.op1 = gimple_call_chain (call); if (stmt_could_throw_p (cfun, call) && (lr = lookup_stmt_eh_lp (call)) > 0) temp.op2 = size_int (lr); @@ -1459,9 +1473,11 @@ fully_constant_vn_reference_p (vn_reference_t ref) a call to a builtin function with at most two arguments. */ op = &operands[0]; if (op->opcode == CALL_EXPR - && TREE_CODE (op->op0) == ADDR_EXPR - && TREE_CODE (TREE_OPERAND (op->op0, 0)) == FUNCTION_DECL - && fndecl_built_in_p (TREE_OPERAND (op->op0, 0)) + && (!op->op0 + || (TREE_CODE (op->op0) == ADDR_EXPR + && TREE_CODE (TREE_OPERAND (op->op0, 0)) == FUNCTION_DECL + && fndecl_built_in_p (TREE_OPERAND (op->op0, 0), + BUILT_IN_NORMAL))) && operands.length () >= 2 && operands.length () <= 3) { @@ -1481,13 +1497,17 @@ fully_constant_vn_reference_p (vn_reference_t ref) anyconst = true; if (anyconst) { - tree folded = build_call_expr (TREE_OPERAND (op->op0, 0), - arg1 ? 2 : 1, - arg0->op0, - arg1 ? arg1->op0 : NULL); - if (folded - && TREE_CODE (folded) == NOP_EXPR) - folded = TREE_OPERAND (folded, 0); + combined_fn fn; + if (op->op0) + fn = as_combined_fn (DECL_FUNCTION_CODE + (TREE_OPERAND (op->op0, 0))); + else + fn = as_combined_fn ((internal_fn) op->clique); + tree folded; + if (arg1) + folded = fold_const_call (fn, ref->type, arg0->op0, arg1->op0); + else + folded = fold_const_call (fn, ref->type, arg0->op0); if (folded && is_gimple_min_invariant (folded)) return folded; @@ -5648,28 +5668,27 @@ visit_stmt (gimple *stmt, bool backedges_varying_p = false) && TREE_CODE (TREE_OPERAND (fn, 0)) == FUNCTION_DECL) extra_fnflags = flags_from_decl_or_type (TREE_OPERAND (fn, 0)); } - if (!gimple_call_internal_p (call_stmt) - && (/* Calls to the same function with the same vuse - and the same operands do not necessarily return the same - value, unless they're pure or const. */ - ((gimple_call_flags (call_stmt) | extra_fnflags) - & (ECF_PURE | ECF_CONST)) - /* If calls have a vdef, subsequent calls won't have - the same incoming vuse. So, if 2 calls with vdef have the - same vuse, we know they're not subsequent. - We can value number 2 calls to the same function with the - same vuse and the same operands which are not subsequent - the same, because there is no code in the program that can - compare the 2 values... */ - || (gimple_vdef (call_stmt) - /* ... unless the call returns a pointer which does - not alias with anything else. In which case the - information that the values are distinct are encoded - in the IL. */ - && !(gimple_call_return_flags (call_stmt) & ERF_NOALIAS) - /* Only perform the following when being called from PRE - which embeds tail merging. */ - && default_vn_walk_kind == VN_WALK))) + if (/* Calls to the same function with the same vuse + and the same operands do not necessarily return the same + value, unless they're pure or const. */ + ((gimple_call_flags (call_stmt) | extra_fnflags) + & (ECF_PURE | ECF_CONST)) + /* If calls have a vdef, subsequent calls won't have + the same incoming vuse. So, if 2 calls with vdef have the + same vuse, we know they're not subsequent. + We can value number 2 calls to the same function with the + same vuse and the same operands which are not subsequent + the same, because there is no code in the program that can + compare the 2 values... */ + || (gimple_vdef (call_stmt) + /* ... unless the call returns a pointer which does + not alias with anything else. In which case the + information that the values are distinct are encoded + in the IL. */ + && !(gimple_call_return_flags (call_stmt) & ERF_NOALIAS) + /* Only perform the following when being called from PRE + which embeds tail merging. */ + && default_vn_walk_kind == VN_WALK)) changed = visit_reference_op_call (lhs, call_stmt); else changed = defs_to_varying (call_stmt); diff --git a/gcc/tree-ssa-sccvn.h b/gcc/tree-ssa-sccvn.h index 96100596d2e..8a1b649c726 100644 --- a/gcc/tree-ssa-sccvn.h +++ b/gcc/tree-ssa-sccvn.h @@ -106,7 +106,8 @@ typedef const struct vn_phi_s *const_vn_phi_t; typedef struct vn_reference_op_struct { ENUM_BITFIELD(tree_code) opcode : 16; - /* Dependence info, used for [TARGET_]MEM_REF only. */ + /* Dependence info, used for [TARGET_]MEM_REF only. For internal + function calls clique is also used for the internal function code. */ unsigned short clique; unsigned short base; unsigned reverse : 1; </cut>