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From: Uros Bizjak <>
To: "" <>
Cc: Marc Glisse <>, Richard Guenther <>
Subject: Re: [i386] __builtin_ia32_stmxcsr could be pure
Date: Wed, 21 Jun 2017 07:43:00 -0000	[thread overview]
Message-ID: <> (raw)


> glibc marks fegetround as a pure function. On x86, people tend to use
> _MM_GET_ROUNDING_MODE instead, which could benefit from the same. I think it is safe, but
> a second opinion would be welcome. I could have handled just this builtin, but it seemed better to
> provide def_builtin_pure (like "const" already has) since there should be other builtins that can be
> marked this way (maybe the gathers?).
> Bootstrap+testsuite on x86_64-pc-linux-gnu with default languages.
> 2017-05-29  Marc Glisse  <>
> gcc/
> * config/i386/i386.c (struct builtin_isa): New field pure_p.
> Reorder for compactness.
> (def_builtin, def_builtin2, ix86_add_new_builtins): Handle pure_p.
> (def_builtin_pure, def_builtin_pure2): New functions.
> (ix86_init_mmx_sse_builtins) [__builtin_ia32_stmxcsr]: Mark as pure.
> gcc/testsuite/
> * New file.



             reply	other threads:[~2017-06-21  7:43 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-21  7:43 Uros Bizjak [this message]
  -- strict thread matches above, loose matches on Subject: below --
2017-05-26  8:57 Marc Glisse
2017-05-26  9:13 ` Richard Biener
2017-06-03 19:05   ` Marc Glisse
2017-06-20 21:34     ` Marc Glisse

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