From 750900dba0c3d968f7d059c5dc1ff27a246f05f5 Mon Sep 17 00:00:00 2001
From: Kenneth Zadeck <zadeck@naturalbridge.com>
Date: Thu, 15 Jan 2009 15:27:20 +0000
Subject: [PATCH] dce.c (find_call_stack_args, [...]): Fixed comments.
2009-01-15 Kenneth Zadeck <zadeck@naturalbridge.com>
* dce.c (find_call_stack_args, delete_unmarked_insns): Fixed
comments.
From-SVN: r143398
---
gcc/ChangeLog | 5 +++++
gcc/dce.c | 12 ++++++++----
2 files changed, 13 insertions(+), 4 deletions(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index aeab680011ba..bb99b6fbf47d 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2009-01-15 Kenneth Zadeck <zadeck@naturalbridge.com>
+
+ * dce.c (find_call_stack_args, delete_unmarked_insns): Fixed
+ comments.
+
2009-01-14 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/38245
diff --git a/gcc/dce.c b/gcc/dce.c
index 75e148cf4341..5a64fb2ecf83 100644
--- a/gcc/dce.c
+++ b/gcc/dce.c
@@ -358,7 +358,7 @@ find_call_stack_args (rtx call_insn, bool do_mark, bool fast,
}
/* Walk backwards, looking for argument stores. The search stops
- when seeting another call, sp adjustment or memory store other than
+ when seeing another call, sp adjustment or memory store other than
argument store. */
ret = false;
for (insn = PREV_INSN (call_insn); insn; insn = prev_insn)
@@ -522,9 +522,13 @@ delete_unmarked_insns (void)
else if (marked_insn_p (insn))
continue;
- /* Beware that reaching a dbg counter limit here can easily result
- in miscompiled file, whenever some insn is eliminated, but
- insn that depends on it is not. */
+ /* Beware that reaching a dbg counter limit here can rarely
+ result in miscompiled file. This occurs when a group of
+ insns must be deleted together. Currently this only
+ can happen on non-looping pure and constant calls
+ on machines where ACCUMULATE_OUTGOING_ARGS is true. By
+ using the dbg_cnt, it is possible to remove the call, but
+ leave the argument pushes to the stack. */
if (!dbg_cnt (dce))
continue;
--
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