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Thumb2 assembly parsing and encoding for MUL.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139735 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2011-09-14 21:00:40 +00:00
parent 10df80692c
commit 64944f48a1
2 changed files with 38 additions and 1 deletions
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24
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -3307,7 +3307,7 @@ bool ARMAsmParser::shouldOmitCCOutOperand(StringRef Mnemonic,
// If both registers are low, we're in an IT block, and the immediate is
// in range, we should use encoding T1 instead, which has a cc_out.
if (inITBlock() &&
isARMLowRegister(static_cast<ARMOperand*>(Operands[4])->getReg()) &&
isARMLowRegister(static_cast<ARMOperand*>(Operands[3])->getReg()) &&
isARMLowRegister(static_cast<ARMOperand*>(Operands[4])->getReg()) &&
static_cast<ARMOperand*>(Operands[5])->isImm0_7())
return false;
@ -3317,6 +3317,28 @@ bool ARMAsmParser::shouldOmitCCOutOperand(StringRef Mnemonic,
return true;
}
// The thumb2 multiply instruction doesn't have a CCOut register, so
// if we have a "mul" mnemonic in Thumb mode, check if we'll be able to
// use the 16-bit encoding or not.
if (isThumbTwo() && Mnemonic == "mul" && Operands.size() == 6 &&
static_cast<ARMOperand*>(Operands[1])->getReg() == 0 &&
static_cast<ARMOperand*>(Operands[3])->isReg() &&
static_cast<ARMOperand*>(Operands[4])->isReg() &&
static_cast<ARMOperand*>(Operands[5])->isReg() &&
// If the registers aren't low regs, the destination reg isn't the
// same as one of the source regs, or the cc_out operand is zero
// outside of an IT block, we have to use the 32-bit encoding, so
// remove the cc_out operand.
(!isARMLowRegister(static_cast<ARMOperand*>(Operands[3])->getReg()) ||
!isARMLowRegister(static_cast<ARMOperand*>(Operands[4])->getReg()) ||
!inITBlock() ||
(static_cast<ARMOperand*>(Operands[3])->getReg() !=
static_cast<ARMOperand*>(Operands[5])->getReg() &&
static_cast<ARMOperand*>(Operands[3])->getReg() !=
static_cast<ARMOperand*>(Operands[4])->getReg())))
return true;
// Register-register 'add/sub' for thumb does not have a cc_out operand
// when it's an ADD/SUB SP, #imm. Be lenient on count since there's also

15
test/MC/ARM/basic-thumb2-instructions.s
View File

@ -1108,6 +1108,21 @@ _func:
@ CHECK: msr CPSR_fsxc, r8 @ encoding: [0x88,0xf3,0x00,0x8f]
@------------------------------------------------------------------------------
@ MUL
@------------------------------------------------------------------------------
muls r3, r4, r3
mul r3, r4, r3
mul r3, r4, r6
it eq
muleq r3, r4, r5
@ CHECK: muls r3, r4, r3 @ encoding: [0x63,0x43]
@ CHECK: mul r3, r4, r3 @ encoding: [0x04,0xfb,0x03,0xf3]
@ CHECK: mul r3, r4, r6 @ encoding: [0x04,0xfb,0x06,0xf3]
@ CHECK: it eq @ encoding: [0x08,0xbf]
@ CHECK: muleq r3, r4, r5 @ encoding: [0x04,0xfb,0x05,0xf3]
@------------------------------------------------------------------------------
@ IT
@------------------------------------------------------------------------------