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Thumb parsing and encoding for RSB.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138308 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach
2011-08-22 23:47:13 +00:00
parent 8e1e60b5f8
commit 934755ac04
2 changed files with 21 additions and 0 deletions
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13
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@@ -3029,6 +3029,19 @@ bool ARMAsmParser::ParseInstruction(StringRef Name, SMLoc NameLoc,
delete Op; delete Op;
} }
} }
// Similarly, the Thumb1 "RSB" instruction has a literal "#0" on the
// end. Convert it to a token here.
if (Mnemonic == "rsb" && isThumb() && Operands.size() == 6 &&
static_cast<ARMOperand*>(Operands[5])->isImm()) {
ARMOperand *Op = static_cast<ARMOperand*>(Operands[5]);
const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(Op->getImm());
if (CE && CE->getValue() == 0) {
Operands.erase(Operands.begin() + 5);
Operands.push_back(ARMOperand::CreateToken("#0", Op->getStartLoc()));
delete Op;
}
}
return false; return false;
} }

8
test/MC/ARM/basic-thumb-instructions.s
View File

@@ -399,3 +399,11 @@ _func:
rors r2, r7 rors r2, r7
@ CHECK: rors r2, r7 @ encoding: [0xfa,0x41] @ CHECK: rors r2, r7 @ encoding: [0xfa,0x41]
@------------------------------------------------------------------------------
@ RSB
@------------------------------------------------------------------------------
rsbs r1, r3, #0
rsbs r1, r3, #0 @ encoding: [0x59,0x42]