diff options
Diffstat (limited to 'llvm/tools')
| -rw-r--r-- | llvm/tools/llvm-exegesis/lib/X86/Target.cpp | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/llvm/tools/llvm-exegesis/lib/X86/Target.cpp b/llvm/tools/llvm-exegesis/lib/X86/Target.cpp index 6cf3d465dd9..974b2c938c3 100644 --- a/llvm/tools/llvm-exegesis/lib/X86/Target.cpp +++ b/llvm/tools/llvm-exegesis/lib/X86/Target.cpp @@ -439,6 +439,8 @@ struct ConstantInliner { std::vector<MCInst> popFlagAndFinalize(); + std::vector<MCInst> loadMXCSRAndFinalize(bool HasAVX); + private: ConstantInliner &add(const MCInst &Inst) { Instructions.push_back(Inst); @@ -499,6 +501,19 @@ std::vector<MCInst> ConstantInliner::popFlagAndFinalize() { return std::move(Instructions); } +std::vector<MCInst> ConstantInliner::loadMXCSRAndFinalize(bool HasAVX) { + add(allocateStackSpace(4)); + add(fillStackSpace(X86::MOV32mi, 0, 0x1f80)); // Mask all FP exceptions + add(MCInstBuilder(HasAVX ? X86::VLDMXCSR : X86::LDMXCSR) + // Address = ESP + .addReg(X86::RSP) // BaseReg + .addImm(1) // ScaleAmt + .addReg(0) // IndexReg + .addImm(0) // Disp + .addReg(0)); // Segment + return std::move(Instructions); +} + void ConstantInliner::initStack(unsigned Bytes) { assert(Constant_.getBitWidth() <= Bytes * 8 && "Value does not have the correct size"); @@ -699,6 +714,8 @@ std::vector<MCInst> ExegesisX86Target::setRegTo(const MCSubtargetInfo &STI, } if (Reg == X86::EFLAGS) return CI.popFlagAndFinalize(); + if (Reg == X86::MXCSR) + return CI.loadMXCSRAndFinalize(STI.getFeatureBits()[X86::FeatureAVX]); return {}; // Not yet implemented. } |
