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| author | Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org> | 2020-11-24 06:50:53 +0530 |
|---|---|---|
| committer | Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org> | 2020-11-24 06:57:46 +0530 |
| commit | 5700973f4a30762b4fc21687bb5f7843e55da2e4 (patch) | |
| tree | ab46cb4c3c4498841557134ca7ebb937458fc5f4 /gcc/tree-if-conv.c | |
| parent | 6692c400f207c68fb11b44182ae127856e8b9ad3 (diff) | |
tree-opt: Fix segfault in tree-if-conv.c with -march=armv8.2-a+sve [PR97849]
The issue here is that rpo vn may eliminate target ssa_name referred to in
redundant_ssa_names, and thus ifcvt_local_dce may replace candidate
ssa_name with invalid ssa_name resulting in incorrect IR. The patch simply
does ssa_name replacement before calling do_rpo_vn, which fixes the issue.
gcc/
2020-11-24 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
PR tree-optimization/97849
* tree-if-conv.c (tree_if_conversion): Move ssa_name
replacement code from ifcvt_local_dce to this function
before calling do_rpo_vn.
gcc/testsuite/
2020-11-24 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
PR tree-optimization/97849
* gcc.dg/tree-ssa/pr97849.c: New test.
Diffstat (limited to 'gcc/tree-if-conv.c')
| -rw-r--r-- | gcc/tree-if-conv.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/gcc/tree-if-conv.c b/gcc/tree-if-conv.c index 2062758f40f..93effaa811b 100644 --- a/gcc/tree-if-conv.c +++ b/gcc/tree-if-conv.c @@ -2916,12 +2916,6 @@ ifcvt_local_dce (class loop *loop) enum gimple_code code; use_operand_p use_p; imm_use_iterator imm_iter; - std::pair <tree, tree> *name_pair; - unsigned int i; - - FOR_EACH_VEC_ELT (redundant_ssa_names, i, name_pair) - replace_uses_by (name_pair->first, name_pair->second); - redundant_ssa_names.release (); /* The loop has a single BB only. */ basic_block bb = loop->header; @@ -3124,6 +3118,13 @@ tree_if_conversion (class loop *loop, vec<gimple *> *preds) exit_bbs = BITMAP_ALLOC (NULL); bitmap_set_bit (exit_bbs, single_exit (loop)->dest->index); bitmap_set_bit (exit_bbs, loop->latch->index); + + std::pair <tree, tree> *name_pair; + unsigned ssa_names_idx; + FOR_EACH_VEC_ELT (redundant_ssa_names, ssa_names_idx, name_pair) + replace_uses_by (name_pair->first, name_pair->second); + redundant_ssa_names.release (); + todo |= do_rpo_vn (cfun, loop_preheader_edge (loop), exit_bbs); /* Delete dead predicate computations. */ |