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Change the order of tBX's operands so that the predicate operands come after the

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target register, matching BX. I filed this bug because I was confused at first:

PR10007 - ARM branch instructions have inconsistent predicate operand placement
<http://llvm.org/bugs/show_bug.cgi?id=10007>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132041 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich 2011-05-25 04:45:23 +00:00
parent 8f161c3a95
commit 328634598f
2 changed files with 11 additions and 2 deletions
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2
lib/Target/ARM/ARMInstrThumb.td
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@ -369,7 +369,7 @@ let isReturn = 1, isTerminator = 1, isBarrier = 1 in {
let Inst{2-0} = 0b000;
}
def tBX : TI<(outs), (ins pred:$p, GPR:$Rm), IIC_Br, "bx${p}\t$Rm", []>,
def tBX : TI<(outs), (ins GPR:$Rm, pred:$p), IIC_Br, "bx${p}\t$Rm", []>,
T1Special<{1,1,0,?}> {
// A6.2.3 & A8.6.25
bits<4> Rm;

11
lib/Target/ARM/Disassembler/ThumbDisassemblerCore.h
View File

@ -489,15 +489,24 @@ static bool DisassembleThumb1Special(MCInst &MI, unsigned Opcode, uint32_t insn,
// BX/BLX/tBRIND (indirect branch, i.e, mov pc, Rm) has 1 reg operand: Rm.
if (Opcode==ARM::tBLXr_r9 || Opcode==ARM::tBX || Opcode==ARM::tBRIND) {
if (Opcode != ARM::tBRIND) {
if (Opcode == ARM::tBLXr_r9) {
// Handling the two predicate operands before the reg operand.
if (!B->DoPredicateOperands(MI, Opcode, insn, NumOps))
return false;
NumOpsAdded += 2;
}
MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
getT1Rm(insn))));
NumOpsAdded += 1;
if (Opcode == ARM::tBX) {
// Handling the two predicate operands after the reg operand.
if (!B->DoPredicateOperands(MI, Opcode, insn, NumOps))
return false;
NumOpsAdded += 2;
}
return true;
}