GCC与多种架构兼容的最高指令集 [英] GCC highest set of instructions compatible with multiple architectures

问题描述

我正在由具有不同体系结构的计算机组成的群集上运行作业：
gcc -march = native -Q --help = target | grep-‘-march =’| cut -f3 给了我其中一个： broadwell ， haswell ， ivbridge ， sandybridge 或 skylake 。

I am running jobs on a cluster composed of machines with different architectures: gcc -march=native -Q --help=target | grep -- '-march=' | cut -f3 gives me one of these: broadwell, haswell, ivybridge, sandybridge or skylake.

可执行文件必须是相同的，所以我不能使用 -march = native ，但与此同时，这些架构有一些共同点（我认为它们都支持AVX吗？）。

The executable needs to be the same, so I cannot use -march=native but at the same time the architectures have things in common (I think they all support AVX?).

我知道 gcc （与Intel icc相反）不允许在单个可执行文件中使用多个架构。我想知道的是，是否有办法向 gcc 要求与上述所有架构兼容的最高指令集。

I am aware that gcc (contrary to Intel icc) does not allow for multiple archictures in a single executable. What I would like to know is if there is a way to ask gcc for the highest set of instructions compatible with all the architectures listed above.

gcc版本：8.1.1

gcc version: 8.1.1

推荐答案

评论建议我自己看一下交叉点在架构之间。以下bash脚本似乎可以完成这项工作。

Comments suggested me to look by myself at the 'intersection' between the architectures. The following bash script seems to do the job.

#!/usr/bin/env bash

archs=("broadwell" "haswell" "ivybridge" "sandybridge" "skylake")

for ar in ${archs[@]}; do
    gcc -march=$ar -Q --help=target | grep -- "  -m" > "$ar.log"
done

cp "${archs[0]}.log" all.log
for ar in ${archs[@]:1}; do
    join all.log "$ar.log" > tmp.log
    mv tmp.log all.log
done

cat all.log | grep "\[activé]" | grep -v "\[désactivé]" | cut -d' ' -f1 | tr '\n' ' '

（法语的计算机：activé => enabled ，désactivé => disabled）

(Computer in French: "activé" => "enabled", "désactivé" => "disabled")

输出为

-m128bit-long-double -m64 -m80387 -maes -malign-stringops -mavx -mcx16 -mfancy-math-387 -mfp-ret-in-387 -mfxsr -mglibc -mhard-float -mieee-fp -mlong-double-80 -mmmx -mpclmul -mpopcnt -mpush-args -mred-zone -msahf -msse -msse2 -msse3 -msse4 -msse4.1 -msse4.2 -mssse3 -mstv -mtls-direct-seg-refs -mvzeroupper -mxsave -mxsaveopt

我希望所有体系结构都支持SSE和AVX。

As I expected all the architectures support both SSE and AVX.

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