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ARM Allow 'q' registers in VLD/VST vector lists.

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Just treat it as if the constituent D registers where specified.

rdar://10348896

llvm-svn: 143167
This commit is contained in:
Jim Grosbach 2011-10-28 00:06:50 +00:00
parent 892b86e74c
commit dac7815a91
2 changed files with 56 additions and 4 deletions
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51
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -2440,6 +2440,29 @@ parseRegisterList(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
return false;
}
// Return the low-subreg of a given Q register.
static unsigned getDRegFromQReg(unsigned QReg) {
switch (QReg) {
default: llvm_unreachable("expected a Q register!");
case ARM::Q0: return ARM::D0;
case ARM::Q1: return ARM::D2;
case ARM::Q2: return ARM::D4;
case ARM::Q3: return ARM::D6;
case ARM::Q4: return ARM::D8;
case ARM::Q5: return ARM::D10;
case ARM::Q6: return ARM::D12;
case ARM::Q7: return ARM::D14;
case ARM::Q8: return ARM::D16;
case ARM::Q9: return ARM::D19;
case ARM::Q10: return ARM::D20;
case ARM::Q11: return ARM::D22;
case ARM::Q12: return ARM::D24;
case ARM::Q13: return ARM::D26;
case ARM::Q14: return ARM::D28;
case ARM::Q15: return ARM::D30;
}
}
// parse a vector register list
ARMAsmParser::OperandMatchResultTy ARMAsmParser::
parseVectorList(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
@ -2455,9 +2478,16 @@ parseVectorList(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
Error(RegLoc, "register expected");
return MatchOperand_ParseFail;
}
unsigned FirstReg = Reg;
unsigned Count = 1;
unsigned FirstReg = Reg;
// The list is of D registers, but we also allow Q regs and just interpret
// them as the two D sub-registers.
if (ARMMCRegisterClasses[ARM::QPRRegClassID].contains(Reg)) {
FirstReg = Reg = getDRegFromQReg(Reg);
++Reg;
++Count;
}
while (Parser.getTok().is(AsmToken::Comma)) {
Parser.Lex(); // Eat the comma.
RegLoc = Parser.getTok().getLoc();
@ -2467,14 +2497,27 @@ parseVectorList(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
Error(RegLoc, "register expected");
return MatchOperand_ParseFail;
}
// vector register lists must also be contiguous.
// vector register lists must be contiguous.
// It's OK to use the enumeration values directly here rather, as the
// VFP register classes have the enum sorted properly.
//
// The list is of D registers, but we also allow Q regs and just interpret
// them as the two D sub-registers.
if (ARMMCRegisterClasses[ARM::QPRRegClassID].contains(Reg)) {
Reg = getDRegFromQReg(Reg);
if (Reg != OldReg + 1) {
Error(RegLoc, "non-contiguous register range");
return MatchOperand_ParseFail;
}
++Reg;
Count += 2;
continue;
}
// Normal D register. Just check that it's contiguous and keep going.
if (Reg != OldReg + 1) {
Error(RegLoc, "non-contiguous register range");
return MatchOperand_ParseFail;
}
++Count;
}

9
test/MC/ARM/neon-vld-encoding.s
View File

@ -214,3 +214,12 @@
@ FIXME: vld4.32 {d16[1], d17[1], d18[1], d19[1]}, [r0, :128] @ encoding: [0xaf,0x0b,0xe0,0xf4]
@ FIXME: vld4.16 {d16[1], d18[1], d20[1], d22[1]}, [r0, :64] @ encoding: [0x7f,0x07,0xe0,0xf4]
@ FIXME: vld4.32 {d17[0], d19[0], d21[0], d23[0]}, [r0] @ encoding: [0x4f,0x1b,0xe0,0xf4]
@ Handle 'Q' registers in register lists as if the sub-reg D regs were
@ specified instead.
vld1.8 {q3}, [r9]
vld1.8 {q3, q4}, [r9]
@ CHECK: vld1.8 {d6, d7}, [r9] @ encoding: [0x0f,0x6a,0x29,0xf4]
@ CHECK: vld1.8 {d6, d7, d8, d9}, [r9] @ encoding: [0x0f,0x62,0x29,0xf4]