It appears to be a recent regression. [512] % gcctk -v Using built-in specs. COLLECT_GCC=gcctk COLLECT_LTO_WRAPPER=/home/suz/software/gcctk/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/10.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: ../gcc-source-trunk/configure --disable-multilib --enable-languages=c,c++,lto --prefix=/home/suz/software/gcctk/gcc-trunk --disable-bootstrap Thread model: posix Supported LTO compression algorithms: zlib gcc version 10.0.0 20190718 (experimental) [trunk revision 273570] (GCC) [513] % [513] % gcctk -O0 small.c [514] % gcc-9.1.0 -O1 small.c [515] % [515] % gcctk -O1 small.c small.c: In function ‘main’: small.c:6:5: error: definition in block 4 does not dominate use in block 3 6 | int main () | ^~~~ for SSA_NAME: i_20 in statement: # VUSE <.MEM_13> cstore_6 = MEM <int *[2]> [(void *)&h][i_20]; during GIMPLE pass: cselim small.c:6:5: internal compiler error: verify_ssa failed 0xed1acb verify_ssa(bool, bool) ../../gcc-source-trunk/gcc/tree-ssa.c:1208 0xb861d7 execute_function_todo ../../gcc-source-trunk/gcc/passes.c:1970 0xb87102 execute_todo ../../gcc-source-trunk/gcc/passes.c:2017 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. [516] % ------------------------------------------- int printf (const char *, ...); char a; int b, c, **d; int main () { int f = -128, *g, *h[2] = {0, 0}, i; printf("0"); if (a) { while (f > a) { int *j = &i; *j |= 0; } h[i] = &c; } if (h[1]) { int **k = &g; *k = &f; while (i) { int **l[] = {&g}; } int **m = &g; *d = *m = &b; } return 0; }
Latent issue - mine.
So we're applying cselim to if (a.0_1 != 0) goto <bb 3>; [50.00%] else goto <bb 4>; [50.00%] <bb 3> [local count: 766958447]: # i_20 = PHI <i_22(D)(2)> h[i_20] = &c; <bb 4> [local count: 168730858]: # i_21 = PHI <i_22(D)(2), i_20(3)> where bb3 has only a single stmt but the PHI node precludes simply inserting the stmt elsewhere. The PHI node is left from non-iterating FRE which isn't able to do all simplification in one go.
Author: rguenth Date: Fri Jul 19 12:24:53 2019 New Revision: 273602 URL: https://gcc.gnu.org/viewcvs?rev=273602&root=gcc&view=rev Log: 2019-07-19 Richard Biener <rguenther@suse.de> PR tree-optimization/91200 * tree-ssa-phiopt.c (cond_store_replacement): Check we have no PHI nodes in middle-bb. * gcc.dg/torture/pr91200.c: New testcase. Added: trunk/gcc/testsuite/gcc.dg/torture/pr91200.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-ssa-phiopt.c
Author: rguenth Date: Wed Jul 31 15:40:36 2019 New Revision: 273939 URL: https://gcc.gnu.org/viewcvs?rev=273939&root=gcc&view=rev Log: 2019-07-31 Richard Biener <rguenther@suse.de> Backport from mainline 2019-07-19 Richard Biener <rguenther@suse.de> PR tree-optimization/91200 * tree-ssa-phiopt.c (cond_store_replacement): Check we have no PHI nodes in middle-bb. * gcc.dg/torture/pr91200.c: New testcase. 2019-07-15 Richard Biener <rguenther@suse.de> PR middle-end/91162 * tree-cfg.c (move_block_to_fn): When releasing a virtual PHI node make sure to replace all uses with something valid. * gcc.dg/autopar/pr91162.c: New testcase. 2019-07-12 Richard Biener <rguenther@suse.de> PR tree-optimization/91145 * tree-vect-slp.c (vect_build_slp_tree_2): Fix reduction chain check. * gcc.dg/torture/pr91145.c: New testcase. 2019-07-11 Richard Biener <rguenther@suse.de> PR middle-end/91131 * gimplify.c (gimplify_compound_literal_expr): Force a temporary when the object is volatile and we have not cleared it even though there are no nonzero elements. * gcc.target/i386/pr91131.c: New testcase. 2019-07-10 Richard Biener <rguenther@suse.de> PR tree-optimization/91126 * tree-ssa-sccvn.c (n_walk_cb_data::push_partial_def): Adjust native encoding offset for BYTES_BIG_ENDIAN. (vn_reference_lookup_3): Likewise. * gcc.dg/torture/pr91126.c: New testcase. Added: branches/gcc-9-branch/gcc/testsuite/gcc.dg/autopar/pr91162.c branches/gcc-9-branch/gcc/testsuite/gcc.dg/torture/pr91126.c branches/gcc-9-branch/gcc/testsuite/gcc.dg/torture/pr91145.c branches/gcc-9-branch/gcc/testsuite/gcc.dg/torture/pr91200.c branches/gcc-9-branch/gcc/testsuite/gcc.target/i386/pr91131.c Modified: branches/gcc-9-branch/gcc/ChangeLog branches/gcc-9-branch/gcc/gimplify.c branches/gcc-9-branch/gcc/testsuite/ChangeLog branches/gcc-9-branch/gcc/tree-cfg.c branches/gcc-9-branch/gcc/tree-ssa-phiopt.c branches/gcc-9-branch/gcc/tree-ssa-sccvn.c branches/gcc-9-branch/gcc/tree-vect-slp.c
Author: rguenth Date: Fri Aug 30 11:39:19 2019 New Revision: 275100 URL: https://gcc.gnu.org/viewcvs?rev=275100&root=gcc&view=rev Log: 2019-08-30 Richard Biener <rguenther@suse.de> Backport from mainline 2019-08-12 Richard Biener <rguenther@suse.de> PR lto/91375 * tree.c (free_lang_data_in_type): Do not free TYPE_BINFO dependent on flag_devirtualize. 2019-07-31 Richard Biener <rguenther@suse.de> PR tree-optimization/91293 * tree-vect-slp.c (vect_build_slp_tree_2): Do not swap operands of reduction stmts. * gcc.dg/vect/pr91293-1.c: New testcase. * gcc.dg/vect/pr91293-2.c: Likewise. * gcc.dg/vect/pr91293-3.c: Likewise. 2019-07-31 Richard Biener <rguenther@suse.de> PR tree-optimization/91280 * tree-ssa-structalias.c (get_constraint_for_component_ref): Decompose MEM_REF manually for offset handling. * g++.dg/torture/pr91280.C: New testcase. 2019-07-19 Richard Biener <rguenther@suse.de> PR tree-optimization/91200 * tree-ssa-phiopt.c (cond_store_replacement): Check we have no PHI nodes in middle-bb. * gcc.dg/torture/pr91200.c: New testcase. 2019-07-15 Richard Biener <rguenther@suse.de> PR middle-end/91162 * tree-cfg.c (move_block_to_fn): When releasing a virtual PHI node make sure to replace all uses with something valid. * gcc.dg/autopar/pr91162.c: New testcase. 2019-07-11 Richard Biener <rguenther@suse.de> PR middle-end/91131 * gimplify.c (gimplify_compound_literal_expr): Force a temporary when the object is volatile and we have not cleared it even though there are no nonzero elements. * gcc.target/i386/pr91131.c: New testcase. 2019-07-10 Richard Biener <rguenther@suse.de> PR tree-optimization/91126 * tree-ssa-sccvn.c (vn_reference_lookup_3): Adjust native encoding offset for BYTES_BIG_ENDIAN. * gcc.dg/torture/pr91126.c: New testcase. Added: branches/gcc-8-branch/gcc/testsuite/g++.dg/torture/pr91280.C branches/gcc-8-branch/gcc/testsuite/gcc.dg/autopar/pr91162.c branches/gcc-8-branch/gcc/testsuite/gcc.dg/torture/pr91126.c branches/gcc-8-branch/gcc/testsuite/gcc.dg/torture/pr91200.c branches/gcc-8-branch/gcc/testsuite/gcc.dg/vect/pr91293-1.c branches/gcc-8-branch/gcc/testsuite/gcc.dg/vect/pr91293-2.c branches/gcc-8-branch/gcc/testsuite/gcc.dg/vect/pr91293-3.c branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr91131.c Modified: branches/gcc-8-branch/gcc/ChangeLog branches/gcc-8-branch/gcc/gimplify.c branches/gcc-8-branch/gcc/testsuite/ChangeLog branches/gcc-8-branch/gcc/tree-cfg.c branches/gcc-8-branch/gcc/tree-ssa-phiopt.c branches/gcc-8-branch/gcc/tree-ssa-sccvn.c branches/gcc-8-branch/gcc/tree-ssa-structalias.c branches/gcc-8-branch/gcc/tree-vect-slp.c branches/gcc-8-branch/gcc/tree.c
Author: rguenth Date: Mon Sep 2 12:56:24 2019 New Revision: 275317 URL: https://gcc.gnu.org/viewcvs?rev=275317&root=gcc&view=rev Log: 2019-09-02 Richard Biener <rguenther@suse.de> Backport from mainline 2019-07-19 Richard Biener <rguenther@suse.de> PR tree-optimization/91200 * tree-ssa-phiopt.c (cond_store_replacement): Check we have no PHI nodes in middle-bb. * gcc.dg/torture/pr91200.c: New testcase. 2019-07-15 Richard Biener <rguenther@suse.de> PR middle-end/91162 * tree-cfg.c (move_block_to_fn): When releasing a virtual PHI node make sure to replace all uses with something valid. * gcc.dg/autopar/pr91162.c: New testcase. 2019-07-11 Richard Biener <rguenther@suse.de> PR middle-end/91131 * gimplify.c (gimplify_compound_literal_expr): Force a temporary when the object is volatile and we have not cleared it even though there are no nonzero elements. * gcc.target/i386/pr91131.c: New testcase. 2019-07-10 Richard Biener <rguenther@suse.de> PR tree-optimization/91126 * tree-ssa-sccvn.c (n_walk_cb_data::push_partial_def): Adjust native encoding offset for BYTES_BIG_ENDIAN. (vn_reference_lookup_3): Likewise. * gcc.dg/torture/pr91126.c: New testcase. 2019-07-10 Richard Biener <rguenther@suse.de> PR tree-optimization/91126 * tree-ssa-sccvn.c (vn_reference_lookup_3): Adjust native encoding offset for BYTES_BIG_ENDIAN. * gcc.dg/torture/pr91126.c: New testcase. 2019-04-29 Richard Biener <rguenther@suse.de> PR tree-optimization/90278 * tree-ssa-forwprop.c (pass_forwprop::execute): Transfer/clean EH on comparison simplification. * gcc.dg/torture/pr90278.c: New testcase. 2019-04-11 Richard Biener <rguenther@suse.de> PR tree-optimization/90020 * tree-ssa-sccvn.c (vn_reference_may_trap): New function. * tree-ssa-sccvn.h (vn_reference_may_trap): Declare. * tree-ssa-pre.c (compute_avail): Use it to not put possibly trapping references after a call that might not return into EXP_GEN. * gcse.c (compute_hash_table_work): Do not elide marking a block containing a call if the call might not return. * gcc.dg/torture/pr90020.c: New testcase. Added: branches/gcc-7-branch/gcc/testsuite/gcc.dg/autopar/pr91162.c branches/gcc-7-branch/gcc/testsuite/gcc.dg/torture/pr90020.c branches/gcc-7-branch/gcc/testsuite/gcc.dg/torture/pr90278.c branches/gcc-7-branch/gcc/testsuite/gcc.dg/torture/pr91126.c branches/gcc-7-branch/gcc/testsuite/gcc.dg/torture/pr91200.c branches/gcc-7-branch/gcc/testsuite/gcc.target/i386/pr91131.c Modified: branches/gcc-7-branch/gcc/ChangeLog branches/gcc-7-branch/gcc/gcse.c branches/gcc-7-branch/gcc/gimplify.c branches/gcc-7-branch/gcc/testsuite/ChangeLog branches/gcc-7-branch/gcc/tree-cfg.c branches/gcc-7-branch/gcc/tree-ssa-forwprop.c branches/gcc-7-branch/gcc/tree-ssa-phiopt.c branches/gcc-7-branch/gcc/tree-ssa-pre.c branches/gcc-7-branch/gcc/tree-ssa-sccvn.c branches/gcc-7-branch/gcc/tree-ssa-sccvn.h
Fixed.