-Original Message-
From: Jeff Law [mailto:l...@redhat.com]
Sent: Friday, September 05, 2014 12:45 PM
To: Zhenqiang Chen
Cc: gcc-patches@gcc.gnu.org
Subject: Re: [PATCH, ira] Miss checks in split_live_ranges_for_shrink_wrap
On 09/01/14 02:13, Zhenqiang Chen wrote:
To split
On 09/01/14 02:13, Zhenqiang Chen wrote:
To split live-range of register, split_live_ranges_for_shrink_wrap will
introduce additional register copies. If such copies can not be optimized by
later optimizations, it will lead to code size and performance regression.
My tests on ARM THUMB1 code
-Original Message-
From: gcc-patches-ow...@gcc.gnu.org [mailto:gcc-patches-
ow...@gcc.gnu.org] On Behalf Of Jeff Law
Sent: Saturday, August 30, 2014 4:54 AM
To: Zhenqiang Chen; gcc-patches@gcc.gnu.org
Subject: Re: [PATCH, ira] Miss checks in split_live_ranges_for_shrink_wrap
On 08/13/14 20:55, Zhenqiang Chen wrote:
Hi,
Function split_live_ranges_for_shrink_wrap has code
if (!flag_shrink_wrap)
return false;
But flag_shrink_wrap is TRUE by default when optimize 0 even if the
port does not support shrink-wrap. To make sure shrink-wrap is
enabled,
