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[Bug binutils/26259] Can't generate ORR instruction


From: nickc at redhat dot com
Subject: [Bug binutils/26259] Can't generate ORR instruction
Date: Tue, 22 Sep 2020 12:49:07 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=26259

Nick Clifton <nickc at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |nickc at redhat dot com

--- Comment #2 from Nick Clifton <nickc at redhat dot com> ---
Hi Alexei,

  The problem is that "0x00800080" can be encoded as an immediate value for
32-bit vector operations, but it cannot be encoded for 64-bit vectors. 
(Because the top 32-bits are all zero, and the encoded constant must be a
single pattern).  See section C3.3.2 of the ARM ARM.

  So 0x0080008000800080 works (single repeating pattern of 0x0080)
 But 0x0000000000800080 does not (two patterns)

Cheers
  Nick

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