http://llvm.org/bugs/show_bug.cgi?id=19362
Bug ID: 19362
Summary: ARM disassembler ignores negative offset bit for
ldrht, ldrsht, strht, and ldrsbt
Product: new-bugs
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Disassembling ldrht, ldrsht, strht, and ldrsbt with llvm-mc produces
instructions without the optional negative sign in front of the optional
offset. All offsets are disassembled as a positive offset, regardless of the
sign bit.
Code to reproduce:
$ echo "ldrht r1, [r2], -r3" | llvm-mc -arch=arm -show-inst
.text
ldrht r1, [r2], -r3 @ <MCInst #217 LDRHTr
@ <MCOperand Reg:67>
@ <MCOperand Reg:68>
@ <MCOperand Reg:68>
@ <MCOperand Reg:69>
@ <MCOperand Imm:0>
@ <MCOperand Imm:14>
@ <MCOperand Reg:0>>
Notice that the Imm is 0. Compare with the disassembly for ldrh in which bit 8
of the immediate is properly set:
$ echo "ldrh r1, [r2], -r3" | llvm-mc -arch=arm -show-inst
.text
ldrh r1, [r2], -r3 @ <MCInst #218 LDRH_POST
@ <MCOperand Reg:67>
@ <MCOperand Reg:68>
@ <MCOperand Reg:68>
@ <MCOperand Reg:69>
@ <MCOperand Imm:256>
@ <MCOperand Imm:14>
@ <MCOperand Reg:0>>
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