http://llvm.org/bugs/show_bug.cgi?id=10702
Summary: [x86 disassembler] crc32 not disassembled correctly
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
From the "Intel® 64 and IA-32 Architectures Software Developer’s Manual
Volume 2 (2A & 2B): Instruction Set Reference, A-Z", p. 3-236:
CRC32 — Accumulate CRC32 Value
F2 0F 38 F0 /r
Clang on OSX assembles:
crc32 %al, %eax
To:
F2 0F 38 F0 C0
With llvm-mc built from trunk revision 135913:
$ echo '0xf2 0x0f 0x38 0xf0 0xc0'| ./llvm-mc -disassemble -triple="x86_64"
<stdin>:1:1: warning: invalid instruction encoding
0xf2 0x0f 0x38 0xf0 0xc0
^
<stdin>:1:21: warning: invalid instruction encoding
0xf2 0x0f 0x38 0xf0 0xc0
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