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[Bug gas/23854] 16-bit GOT access is incorrectly optimized


From: stsp at users dot sourceforge.net
Subject: [Bug gas/23854] 16-bit GOT access is incorrectly optimized
Date: Mon, 05 Nov 2018 19:38:12 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=23854

--- Comment #20 from Stas Sergeev <stsp at users dot sourceforge.net> ---
I disasmed and diffed the object files
without and with your patch. I see a lot of:
---
597,598c597,598
<      745:     8d 74 26 00             lea    0x0(%esi,%eiz,1),%esi
<      749:     8d bc 27 00 00 00 00    lea    0x0(%edi,%eiz,1),%edi
---
>      745:     8d b4 26 00 00 00 00    lea    0x0(%esi,%eiz,1),%esi
>      74c:     8d 74 26 00             lea    0x0(%esi,%eiz,1),%esi
---

Is this correct, that it now applies lea to
%esi twice? As %esi is used as both arg and
result, I think it will be modified twice,
and so I can't imagine those changes lead to
an equivalent code.

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