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| author | Richard Biener <rguenther@suse.de> | 2019-11-29 08:05:03 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2019-11-29 08:05:03 +0000 |
| commit | d5e82c9f686f6c8e2feabfe753258f9fc13d980f (patch) | |
| tree | 363be524c513dea66ba05c50050f4acbe8e50312 /gcc/tree-if-conv.c | |
| parent | 34b43828f840640f8275712867fc52ef6c2714dd (diff) | |
| download | gcc-d5e82c9f686f6c8e2feabfe753258f9fc13d980f.zip gcc-d5e82c9f686f6c8e2feabfe753258f9fc13d980f.tar.gz gcc-d5e82c9f686f6c8e2feabfe753258f9fc13d980f.tar.bz2 | |
re PR tree-optimization/92704 (ICE: Segmentation fault (in process_bb))
2019-11-29 Richard Biener <rguenther@suse.de>
PR tree-optimization/92704
* tree-if-conv.c (combine_blocks): Deal with virtual PHIs
in loops performing only loads.
* gcc.dg/torture/pr92704.c: New testcase.
From-SVN: r278828
Diffstat (limited to 'gcc/tree-if-conv.c')
| -rw-r--r-- | gcc/tree-if-conv.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/tree-if-conv.c b/gcc/tree-if-conv.c index 33d6cdd..d2e40d4 100644 --- a/gcc/tree-if-conv.c +++ b/gcc/tree-if-conv.c @@ -2624,6 +2624,11 @@ combine_blocks (class loop *loop) vphi = get_virtual_phi (bb); if (vphi) { + /* When there's just loads inside the loop a stray virtual + PHI merging the uses can appear, update last_vdef from + it. */ + if (!last_vdef) + last_vdef = gimple_phi_arg_def (vphi, 0); imm_use_iterator iter; use_operand_p use_p; gimple *use_stmt; @@ -2655,6 +2660,10 @@ combine_blocks (class loop *loop) if (gimple_vdef (stmt)) last_vdef = gimple_vdef (stmt); } + else + /* If this is the first load we arrive at update last_vdef + so we handle stray PHIs correctly. */ + last_vdef = gimple_vuse (stmt); if (predicated[i]) { ssa_op_iter i; |