https://sourceware.org/bugzilla/show_bug.cgi?id=20637
Bug ID: 20637
Summary: 32-bit XOP instructions should silently ignore REX_B
Product: binutils
Version: 2.28 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: ram...@hex-rays.com
Target Milestone: ---
Created attachment 9523
--> https://sourceware.org/bugzilla/attachment.cgi?id=9523&action=edit
simple patch (no updates to changelog or testsuite)
32-bit XOP instructions should silently ignore REX_B (confirmed with Intel's
XED tool below)
$ hd xx.bin
00000000 8f c9 78 e2 4d c2 |..x.M.|
00000006
$ xed -32 -ir xx.bin
XDIS 0: XOP XOP 8FC978E24DC2 vphsubwd xmm1, xmmword
ptr [ebp-0x3e]
$ objdump-bad -Mintel -mi386 -b binary -D xx.bin
xx.bin: file format binary
Disassembly of section .data:
00000000 <.data>:
0: 8f c9 78 e2 4d c2 vphsubwd xmm1,XMMWORD PTR [r13d-0x3e]
$ objdump-good -Mintel -mi386 -b binary -D xx.bin
xx.bin: file format binary
Disassembly of section .data:
00000000 <.data>:
0: 8f c9 78 e2 4d c2 vphsubwd xmm1,XMMWORD PTR [ebp-0x3e]
Simple patch attached (no updates to changelog or testsuite).
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