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ARM assembly parsing for register range syntax for VLD/VST register lists.

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For example,
vld1.f64 {d2-d5}, [r2,:128]!

Should be equivalent to:
vld1.f64 {d2,d3,d4,d5}, [r2,:128]!

It's not documented syntax in the ARM ARM, but it is consistent with what's
accepted for VLDM/VSTM and is unambiguous in meaning, so it's a good thing to
support.

rdar://10451128


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144727 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2011-11-15 23:19:15 +00:00
parent 6ac5b165d4
commit e43862b6a6
2 changed files with 42 additions and 2 deletions
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36
lib/Target/ARM/AsmParser/ARMAsmParser.cpp
View File

@ -2420,7 +2420,7 @@ parseRegisterList(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
while (Parser.getTok().is(AsmToken::Comma) ||
Parser.getTok().is(AsmToken::Minus)) {
if (Parser.getTok().is(AsmToken::Minus)) {
Parser.Lex(); // Eat the comma.
Parser.Lex(); // Eat the minus.
SMLoc EndLoc = Parser.getTok().getLoc();
int EndReg = tryParseRegister();
if (EndReg == -1)
@ -2530,7 +2530,39 @@ parseVectorList(SmallVectorImpl<MCParsedAsmOperand*> &Operands) {
++Count;
}
while (Parser.getTok().is(AsmToken::Comma)) {
while (Parser.getTok().is(AsmToken::Comma) ||
Parser.getTok().is(AsmToken::Minus)) {
if (Parser.getTok().is(AsmToken::Minus)) {
Parser.Lex(); // Eat the minus.
SMLoc EndLoc = Parser.getTok().getLoc();
int EndReg = tryParseRegister();
if (EndReg == -1) {
Error(EndLoc, "register expected");
return MatchOperand_ParseFail;
}
// Allow Q regs and just interpret them as the two D sub-registers.
if (ARMMCRegisterClasses[ARM::QPRRegClassID].contains(EndReg))
EndReg = getDRegFromQReg(EndReg) + 1;
// If the register is the same as the start reg, there's nothing
// more to do.
if (Reg == EndReg)
continue;
// The register must be in the same register class as the first.
if (!ARMMCRegisterClasses[ARM::DPRRegClassID].contains(EndReg)) {
Error(EndLoc, "invalid register in register list");
return MatchOperand_ParseFail;
}
// Ranges must go from low to high.
if (Reg > EndReg) {
Error(EndLoc, "bad range in register list");
return MatchOperand_ParseFail;
}
// Add all the registers in the range to the register list.
Count += EndReg - Reg;
Reg = EndReg;
continue;
}
Parser.Lex(); // Eat the comma.
RegLoc = Parser.getTok().getLoc();
int OldReg = Reg;

8
test/MC/ARM/neon-vld-encoding.s
View File

@ -251,3 +251,11 @@
@ CHECK: vld1.8 {d2, d3, d4}, [r2] @ encoding: [0x0f,0x26,0x22,0xf4]
@ CHECK: vld1.32 {d2, d3, d4}, [r2] @ encoding: [0x8f,0x26,0x22,0xf4]
@ CHECK: vld1.64 {d2, d3, d4}, [r2] @ encoding: [0xcf,0x26,0x22,0xf4]
@ Register lists can use the range syntax, just like VLDM
vld1.f64 {d2-d5}, [r2,:128]!
vld1.f64 {d2,d3,d4,d5}, [r2,:128]!
@ CHECK: vld1.64 {d2, d3, d4, d5}, [r2, :128]! @ encoding: [0xed,0x22,0x22,0xf4]
@ CHECK: vld1.64 {d2, d3, d4, d5}, [r2, :128]! @ encoding: [0xed,0x22,0x22,0xf4]