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Re: ARMv8, GCC 4.9 and necessary code optimized away?
- From: Florian Weimer <fweimer at redhat dot com>
- To: noloader at gmail dot com
- Cc: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>
- Date: Mon, 30 May 2016 16:07:39 +0200
- Subject: Re: ARMv8, GCC 4.9 and necessary code optimized away?
- Authentication-results: sourceware.org; auth=none
- References: <CAH8yC8=KPf7edhTRgKV4nVJfwMpSXwmU+PDGfL6i4xA4SDwJwQ at mail dot gmail dot com>
On 05/30/2016 06:00 AM, Jeffrey Walton wrote:
longjmp(s_jmpNoCRC32, 1);
You should use siglongjmp and sigsetjmp.
uint32_t w=0, x=0; uint16_t y=0; uint8_t z=0;
w = __crc32cw(w,x);
w = __crc32ch(w,y);
w = __crc32cb(w,z);
The final w value is never used. You need to make volatile, or
otherwise ensure that the computation does not happen at compile time.
Florian