[llvm] r258312 - Fixing bug in rL258132: [X86] Adding support for missing variations of X86 string related instructions
Quentin Colombet via llvm-commits
llvm-commits at lists.llvm.org
Wed Jan 20 09:14:50 PST 2016
Hi Marina,
Is there a chance you could produce a test case?
Thanks,
-Quentin
> On Jan 20, 2016, at 6:03 AM, Marina Yatsina via llvm-commits <llvm-commits at lists.llvm.org> wrote:
>
> Author: myatsina
> Date: Wed Jan 20 08:03:47 2016
> New Revision: 258312
>
> URL: http://llvm.org/viewvc/llvm-project?rev=258312&view=rev
> Log:
> Fixing bug in rL258132: [X86] Adding support for missing variations of X86 string related instructions
>
> There was a bug in my rL258132 because there's an overloading of the "movsd" and "cmpsd" instructions, e.g. movsd can be either "Move Data from String to String" (the case I wanted to handle) or "Move or Merge Scalar Double-Precision Floating-Point Value" (the case that causes the asserts).
> Added code for escaping the unfamiliar scenarios and falling back to old behviour.
> Also changed the asserts to llvm_unreachable.
>
>
> Modified:
> llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp
>
> Modified: llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp?rev=258312&r1=258311&r2=258312&view=diff
> ==============================================================================
> --- llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp (original)
> +++ llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp Wed Jan 20 08:03:47 2016
> @@ -1007,7 +1007,7 @@ std::unique_ptr<X86Operand> X86AsmParser
> bool X86AsmParser::IsSIReg(unsigned Reg) {
> switch (Reg) {
> default:
> - assert("Only (R|E)SI and (R|E)DI are expected!");
> + llvm_unreachable("Only (R|E)SI and (R|E)DI are expected!");
> return false;
> case X86::RSI:
> case X86::ESI:
> @@ -1024,7 +1024,7 @@ unsigned X86AsmParser::GetSIDIForRegClas
> bool IsSIReg) {
> switch (RegClassID) {
> default:
> - assert("Unexpected register class");
> + llvm_unreachable("Unexpected register class");
> return Reg;
> case X86::GR64RegClassID:
> return IsSIReg ? X86::RSI : X86::RDI;
> @@ -1090,6 +1090,10 @@ bool X86AsmParser::VerifyAndAdjustOperan
> RegClassID = X86::GR32RegClassID;
> else if (X86MCRegisterClasses[X86::GR16RegClassID].contains(OrigReg))
> RegClassID = X86::GR16RegClassID;
> + else
> + // Unexpexted register class type
> + // Return false and let a normal complaint about bogus operands happen
> + return false;
>
> bool IsSI = IsSIReg(FinalReg);
> FinalReg = GetSIDIForRegClass(RegClassID, FinalReg, IsSI);
>
>
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