From 2326627eb19d8c21251fd60479f1a190621c475b Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Tue, 4 May 2021 09:18:11 +0200 Subject: tree-optimization/100398 - avoid DSE of control flow stmt The following makes sure to preserve control altering stmts when removing trivially dead stmts in DSE. 2021-05-04 Richard Biener PR tree-optimization/100398 * tree-ssa-dse.c (pass_dse::execute): Preserve control altering stmts. * gcc.dg/torture/pr100398.c: New testcase. --- gcc/testsuite/gcc.dg/torture/pr100398.c | 13 +++++++++++++ gcc/tree-ssa-dse.c | 1 + 2 files changed, 14 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/torture/pr100398.c diff --git a/gcc/testsuite/gcc.dg/torture/pr100398.c b/gcc/testsuite/gcc.dg/torture/pr100398.c new file mode 100644 index 0000000..41eadde --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr100398.c @@ -0,0 +1,13 @@ +/* { dg-do compile } */ + +int +test5_limit (void) +{ + int addr; + + asm goto ("" : "+r" (addr) : : : t_err); + return 0; + + t_err: + return 1; +} diff --git a/gcc/tree-ssa-dse.c b/gcc/tree-ssa-dse.c index dfa6d31..d7cf747 100644 --- a/gcc/tree-ssa-dse.c +++ b/gcc/tree-ssa-dse.c @@ -1219,6 +1219,7 @@ pass_dse::execute (function *fun) dead SSA defs. */ if (has_zero_uses (DEF_FROM_PTR (def_p)) && !gimple_has_side_effects (stmt) + && !is_ctrl_altering_stmt (stmt) && !stmt_unremovable_because_of_non_call_eh_p (cfun, stmt)) { if (dump_file && (dump_flags & TDF_DETAILS)) -- cgit v1.1