Date: Mon, 22 Sep 2014 07:50:56 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Rui Paulo <rpaulo@me.com> Cc: freebsd-toolchain@freebsd.org, Steve Kargl <sgk@troutmask.apl.washington.edu> Subject: Re: Is this a compiler bug? Message-ID: <8B883BB9-8A59-4197-A69D-210229F8EA86@FreeBSD.org> In-Reply-To: <2EB3354D-0F65-4A79-A378-7F397911284A@me.com> References: <20140922011946.GA4317@troutmask.apl.washington.edu> <670269FD-F75F-4044-8F3C-0260F58A70E2@me.com> <20140922014853.GA4469@troutmask.apl.washington.edu> <2EB3354D-0F65-4A79-A378-7F397911284A@me.com>
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On 22 Sep 2014, at 04:20, Rui Paulo <rpaulo@me.com> wrote:
> On Sep 21, 2014, at 18:48, Steve Kargl <sgk@troutmask.apl.washington.edu> wrote:
>> On Sun, Sep 21, 2014 at 06:38:48PM -0700, Rui Paulo wrote:
>>> On Sep 21, 2014, at 18:19, Steve Kargl <sgk@troutmask.apl.washington.edu> wrote:
>>>>
>>>> #include <stdio.h>
>>>> #include <stdint.h>
>>>>
>>>> int
>>>> main(void)
>>>> {
>>>> uint16_t i;
>>>> i = 0x3ff0+63; printf("%x\n", i);
>>>> i = 0x3ff1+63; printf("%x\n", i);
>>>> i = 0x3ff2+63; printf("%x\n", i);
>>>> i = 0x3ff3+63; printf("%x\n", i);
>>>> i = 0x3ff4+63; printf("%x\n", i);
>>>> i = 0x3ff4+63; printf("%x\n", i);
>>>> i = 0x3ff6+63; printf("%x\n", i);
>>>> i = 0x3ff7+63; printf("%x\n", i);
>>>> i = 0x3ff8+63; printf("%x\n", i);
>>>> i = 0x3ff9+63; printf("%x\n", i);
>>>> i = 0x3ffa+63; printf("%x\n", i);
>>>> i = 0x3ffb+63; printf("%x\n", i);
>>>> i = 0x3ffc+63; printf("%x\n", i);
>>>> i = 0x3ffd+63; printf("%x\n", i);
>>>> i = 0x3ffe+63; printf("%x\n", i);
>>>> i = 0x3fff+63; printf("%x\n", i);
>>>> return 0;
>>>> }
>>>
>>> Looks like it. Please file a bug report with LLVM.
>>>
>>
>> Unfortunately, llvm requires an account to report bugs.
>
> I think I know what's happening: "e" is being parsed as scientific notation.
Yes, this is an unfortunate side effect of hexadecimal float notation
(either in C99, or as a gcc extension [1]).
-Dimitry
[1] https://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html
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