[X86][AsmParser][AVX512] Error appropriately when K0 is tried as a write-mask
K0 isn't expected as a write-mask, so provide a detailed error here, instead of the more generic one (invalid op for insn)
Conforms with gas
Differential Revision: https://reviews.llvm.org/D36570
llvm-svn: 310789
diff --git a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
index fd083b0..881d35e 100644
--- a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -2088,8 +2088,11 @@
// Parse an op-mask register mark ({%k<NUM>}), which is now to be
// expected
unsigned RegNo;
- if (!ParseRegister(RegNo, StartLoc, StartLoc) &&
+ SMLoc RegLoc;
+ if (!ParseRegister(RegNo, RegLoc, StartLoc) &&
X86MCRegisterClasses[X86::VK1RegClassID].contains(RegNo)) {
+ if (RegNo == X86::K0)
+ return Error(RegLoc, "Register k0 can't be used as write mask");
if (!getLexer().is(AsmToken::RCurly))
return Error(getLexer().getLoc(), "Expected } at this point");
Operands.push_back(X86Operand::CreateToken("{", StartLoc));