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Fixed the LLVM ARM v7 assembler and instruction printer for 8-bit immediate offset addressing. The assembler and instruction printer were not properly handeling the #-0 immediate.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156608 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Silviu Baranga 2012-05-11 09:10:54 +00:00
parent 383fd7afd9
commit ca3cd419a5
3 changed files with 12 additions and 3 deletions
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4
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -914,7 +914,9 @@ public:
// Immediate offset in range [-255, 255].
if (!Memory.OffsetImm) return true;
int64_t Val = Memory.OffsetImm->getValue();
return Val > -256 && Val < 256;
// The #-0 offset is encoded as INT32_MIN, and we have to check
// for this too.
return (Val > -256 && Val < 256) || Val == INT32_MIN;
}
bool isAM3Offset() const {
if (Kind != k_Immediate && Kind != k_PostIndexRegister)

8
lib/Target/ARM/InstPrinter/ARMInstPrinter.cpp
View File

@ -426,9 +426,13 @@ void ARMInstPrinter::printAM3PreOrOffsetIndexOp(const MCInst *MI, unsigned Op,
return;
}
if (unsigned ImmOffs = ARM_AM::getAM3Offset(MO3.getImm()))
//If the op is sub we have to print the immediate even if it is 0
unsigned ImmOffs = ARM_AM::getAM3Offset(MO3.getImm());
ARM_AM::AddrOpc op = ARM_AM::getAM3Op(MO3.getImm());
if (ImmOffs || (op == ARM_AM::sub))
O << ", #"
<< ARM_AM::getAddrOpcStr(ARM_AM::getAM3Op(MO3.getImm()))
<< ARM_AM::getAddrOpcStr(op)
<< ImmOffs;
O << ']';
}

3
test/MC/ARM/arm_instructions.s
View File

@ -74,3 +74,6 @@
@ CHECK: cpsie none, #0 @ encoding: [0x00,0x00,0x0a,0xf1]
cpsie none, #0
@ CHECK: strh r3, [r2, #-0] @ encoding: [0xb0,0x30,0x42,0xe1]
strh r3, [r2, #-0]