From fcb2e1ad1499fbc17c19331cb569b53387aeb01a Mon Sep 17 00:00:00 2001 From: steven Date: Tue, 7 Jun 2005 16:54:16 +0000 Subject: [PATCH] PR tree-optimization/21847 * tree-ssa-dce.c (mark_stmt_if_obviously_necessary): With -fnon-call-exceptions, also mark statements inherently necessary if they may throw. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@100714 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/ChangeLog | 7 +++++++ gcc/tree-ssa-dce.c | 9 +++++++++ 2 files changed, 16 insertions(+) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 6796d23fee1..12f036b4d6d 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2005-06-07 Steven Bosscher + + PR tree-optimization/21847 + * tree-ssa-dce.c (mark_stmt_if_obviously_necessary): With + -fnon-call-exceptions, also mark statements inherently + necessary if they may throw. + 2005-06-07 Adrian Straetling * config/s390/s390.md: ("UNSPECV_MB", "UNSPECV_CAS"): New constants. diff --git a/gcc/tree-ssa-dce.c b/gcc/tree-ssa-dce.c index 65c85eb54e9..f6e62dc9c7f 100644 --- a/gcc/tree-ssa-dce.c +++ b/gcc/tree-ssa-dce.c @@ -279,6 +279,15 @@ mark_stmt_if_obviously_necessary (tree stmt, bool aggressive) tree op, def; ssa_op_iter iter; + /* With non-call exceptions, we have to assume that all statements could + throw. If a statement may throw, it is inherently necessary. */ + if (flag_non_call_exceptions + && tree_could_throw_p (stmt)) + { + mark_stmt_necessary (stmt, true); + return; + } + /* Statements that are implicitly live. Most function calls, asm and return statements are required. Labels and BIND_EXPR nodes are kept because they are control flow, and we have no way of knowing whether they can be -- 2.11.0