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【标题描述】选项-O3 -fselective-scheduling2 -ftrapv -fira-loop-pressure -frename-registers -fnon-call-exceptions -fsel-sched-pipelining -fexceptions运行结果不一致
一、缺陷信息
【环境信息】
软件信息
【问题复现步骤】
gcc -w -g -O3 csmith_20240528_142820_219.c -o csmith_20240528_142820_219
./csmith_20240528_142820_219
gcc -w -g -O3 -fselective-scheduling2 -ftrapv -fira-loop-pressure -frename-registers -fnon-call-exceptions -fsel-sched-pipelining -fexceptions csmith_20240528_142820_219.c -o csmith_20240528_142820_219
./csmith_20240528_142820_219
【实际结果】
运行结果不一致
开源gcc编译的结果和-O3是一样的
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22.03-LTS-SP4上也能复现相同问题
经定位，是commit bdb0f40cea4aa1a92ead381b645363ae0571c065引入的问题，请相关责任人进一步分析。
commit bdb0f40cea4aala92ead381b645363ae0571c065(HEAD）
Author: zhanghaijian <z.zhanghaijianchuawei.com>
Date:l Mon Jul 12 10:36:15 2021 4+0800
[Backport]tree-optimization: Avoid issueing loads in SM when possible
Reference:https://gcc.gnu.org/git/?p=gcc.git;a=Commit;h=f9elea10e657af9fb02fafecfla600740fd34409
Currently store-motion emits a load of the value in the loop
preheader even when the original loop does not contain any read
of the reference. This avoids doing this. In the conditional
store-motion case we need to mark the sunk stores with no-warning
since the control dependence is too tricky to figure out for
the uninit warning.
PR合入后，验证如下
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