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Diffstat (limited to 'gcc/tree-ssa-dse.c')
| -rw-r--r-- | gcc/tree-ssa-dse.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gcc/tree-ssa-dse.c b/gcc/tree-ssa-dse.c index cc93f55..76eed06 100644 --- a/gcc/tree-ssa-dse.c +++ b/gcc/tree-ssa-dse.c @@ -898,6 +898,17 @@ dse_classify_store (ao_ref *ref, gimple *stmt, *by_clobber_p = false; defs.unordered_remove (i); } + /* If the path ends here we do not need to process it further. + This for example happens with calls to noreturn functions. */ + else if (gimple_code (def) != GIMPLE_PHI + && has_zero_uses (gimple_vdef (def))) + { + /* But if the store is to global memory it is definitely + not dead. */ + if (ref_may_alias_global_p (ref)) + return DSE_STORE_LIVE; + defs.unordered_remove (i); + } /* In addition to kills we can remove defs whose only use is another def in defs. That can only ever be PHIs of which we track a single for simplicity reasons (we fail for multiple |