Re: GCC 4 and strict aliasing

• Subject: Re: GCC 4 and strict aliasing
• From: "Frederik Slijkerman (FabFilter)" <email@hidden>
• Date: Fri, 17 Mar 2006 18:16:57 +0100
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Hi Eric,

Best regards,
Frederik Slijkerman

On Mar 17, 2006, at 1:19 AM, Frederik Slijkerman (FabFilter) wrote:

I'm compiling an Audio Unit that uses the CoreAudio SDK which I don't want to change, and there is a strict aliasing issue in AUElement::RestoreState() that means that the audio unit cannot properly restore its state. Here are the offending lines:

 UInt32 temp = EndianU32_BtoN(*(UInt32 *)p);
 entry.value = *(Float32 *)&temp;
 p += sizeof(Float32);

The *(Float32 *)&temp expression is compiled incorrectly on the PowerPC architecture which gives entry.value a random value. Interestingly enough, on Intel the correct code is produced.

Please file a bug report. As you've noticed, that's not the best way to swap a float.

Thanks,
Eric

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