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Content preview: I recently found a .. weird bug on Win32 SSE with GCC 4.2.1.
In libspeex/cb_search_sse.h, the following union is used: union { float
__a[4];
__m128 __v; } __u; [...]
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From: Thorvald Natvig <speex@natvig.com>
Subject: SSE bug on Win32 with GCC 4.2.1
Date: Mon, 20 Aug 2007 18:09:46 +0200
Size: 1229
Url:
http://lists.xiph.org/pipermail/speex-dev/attachments/20070820/6dcba083/attachment.mht
> Content analysis details: (4.0 points, 3.0 required)Gah, that's what you get from trying out new fancy mailing software. Just ignore that. Never happened ;)
> I recently found a .. weird bug on Win32 SSE with GCC 4.2.1. > > In libspeex/cb_search_sse.h, the following union is used: > > union { > float __a[4]; > __m128 __v; > } __u; > > For some odd reason, this particular version of GCC will not 16-byte > align the union. IE; the alignment requirement of __v isn't propagated. > Changing it into this: > > union { > float __a[4]; > __m128 __v; > } __u __attribute__((aligned(16))); > > And it works again. This is definitely a GCC bug, but I thought I'd > mention it here in case others have similar problems.That's, euh... "interesting". Did you submit a bug report to the gcc team? I guess I could add your code as a workaround (do you know what version started supporting that attribute?) until it's fixed. I just find it amazing how many bugs in gcc Speex has managed to trigger. I believe this is at least the third one related to SSE (one in 3.4, one in 4.1). Jean-Marc
Jean-Marc Valin wrote:>> I recently found a .. weird bug on Win32 SSE with GCC 4.2.1. >> >> In libspeex/cb_search_sse.h, the following union is used: >> >> union { >> float __a[4]; >> __m128 __v; >> } __u; >> >> For some odd reason, this particular version of GCC will not 16-byte >> align the union. IE; the alignment requirement of __v isn't propagated. >> Changing it into this: >> >> union { >> float __a[4]; >> __m128 __v; >> } __u __attribute__((aligned(16))); >> >> And it works again. This is definitely a GCC bug, but I thought I'd >> mention it here in case others have similar problems. > > That's, euh... "interesting". Did you submit a bug report to the gcc > team? I guess I could add your code as a workaround (do you know what > version started supporting that attribute?) until it's fixed. I just > find it amazing how many bugs in gcc Speex has managed to trigger. I > believe this is at least the third one related to SSE (one in 3.4, one > in 4.1). > > Jean-MarcIt's supported on at least GCC 3.2, but it is very GCC specific and breaks horribly with any other compiler. However, I think this might be "local" to the windows versions of gcc 4.2. I'll install GCC on a few more platforms and try to verify it.