| From: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Victor Wagner <vitus(at)wagner(dot)pp(dot)ru>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Bug fix for glibc broke freebsd build in REL_11_STABLE |
| Date: | 2018-09-04 22:06:07 |
| Message-ID: | 87a7oxudru.fsf@news-spur.riddles.org.uk |
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| Thread: | |
| Lists: | pgsql-hackers |
>>>>> "Andrew" == Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> writes:
Andrew> Specifying a recent microarch makes it use 64-bit FP registers
Andrew> rather than 80-bit ones:
Andrew> cc -O2 -m32 -march=skylake flttst.c && ./a.out
Andrew> r1 = 1, r2 = 1
where "recent" means "since about 2000 or so":
cc -O2 -m32 -march=pentium4 flttst.c && ./a.out
r1 = 1, r2 = 1
(the actual requirement is for SSE2 support)
--
Andrew (irc:RhodiumToad)
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