https://sourceware.org/bugzilla/show_bug.cgi?id=24719
Bug ID: 24719
Summary: objdump fails to reject invalid scatter/gather
prefetch instructions
Product: binutils
Version: 2.32
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: hgreving at google dot com
Target Milestone: ---
Similar to previously filed issue.
llvm-mc-7 seems to handle it correctly:
e.g.
echo "0x62 0xf2 0x7d 0x0f 0xc6 0x4c 0x71 0x35" | /usr/bin/llvm-mc-7
-disassemble -triple=x86_64
.text
<stdin>:1:1: warning: invalid instruction encoding
0x62 0xf2 0x7d 0x0f 0xc6 0x4c 0x71 0x35
The prefetch opcodes accept only certain vsib index sizes, e.g. vgatherpf0dps
only vm32z.
objdump accepts it:
[..]
objdump -d a.out
0: 62 f2 7d 0f c6 4c 71 vgatherpf0dps 0xd4(%rcx,%xmm6,2){%k7}
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