http://llvm.org/bugs/show_bug.cgi?id=12042
Bug #: 12042
Summary: [x86 disassembler] iret suffix incorrect with Intel
syntax and operand size prefix
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
$ echo '0x66 0xcf' | ./llvm-mc -disassemble -x86-asm-syntax=intel
-triple=x86_64
iretw
$ echo '0xcf' | ./llvm-mc -disassemble -x86-asm-syntax=intel -triple=x86_64
iretd
$ echo '0x48 0xcf' | ./llvm-mc -disassemble -x86-asm-syntax=intel
-triple=x86_64
iretq
>From the Intel ISA ref:
CF IRET Valid Valid Interrupt return (16-bit operand size).
CF IRETD Valid Valid Interrupt return (32-bit operand size).
REX.W + CF IRETQ Interrupt return (64-bit operand size).
The first case should show "iret" rather than "iretw".
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