diff options
| -rw-r--r-- | lib/Target/X86/X86MCCodeEmitter.cpp | 9 | ||||
| -rw-r--r-- | test/MC/AsmParser/X86/x86_32-new-encoder.s | 14 |
2 files changed, 16 insertions, 7 deletions
diff --git a/lib/Target/X86/X86MCCodeEmitter.cpp b/lib/Target/X86/X86MCCodeEmitter.cpp index 5d745d2..898592e 100644 --- a/lib/Target/X86/X86MCCodeEmitter.cpp +++ b/lib/Target/X86/X86MCCodeEmitter.cpp @@ -542,14 +542,9 @@ EncodeInstruction(const MCInst &MI, raw_ostream &OS, // FIXME: This is terrible, they should get proper encoding bits in TSFlags. if (Opcode == X86::LFENCE || Opcode == X86::MFENCE || Opcode == X86::MONITOR || Opcode == X86::MWAIT) { - EmitByte(ModRMByte(3, (TSFlags & X86II::FormMask)-X86II::MRM0r, 0), + EmitByte(ModRMByte(3, (TSFlags & X86II::FormMask)-X86II::MRM0r, + Opcode == X86::MWAIT), CurByte, OS); - - switch (Opcode) { - default: break; - case X86::MONITOR: EmitByte(0xC8, CurByte, OS); break; - case X86::MWAIT: EmitByte(0xC9, CurByte, OS); break; - } } else { EmitRegModRMByte(MI.getOperand(CurOp++), (TSFlags & X86II::FormMask)-X86II::MRM0r, diff --git a/test/MC/AsmParser/X86/x86_32-new-encoder.s b/test/MC/AsmParser/X86/x86_32-new-encoder.s new file mode 100644 index 0000000..5c47885 --- /dev/null +++ b/test/MC/AsmParser/X86/x86_32-new-encoder.s @@ -0,0 +1,14 @@ +// RUN: llvm-mc -triple i386-unknown-unknown --show-encoding --enable-new-x86-encoder %s | FileCheck %s + + lfence +// CHECK: lfence +// CHECK: encoding: [0x0f,0xae,0xe8] + mfence +// CHECK: mfence +// CHECK: encoding: [0x0f,0xae,0xf0] + monitor +// CHECK: monitor +// CHECK: encoding: [0x0f,0x01,0xc8] + mwait +// CHECK: mwait +// CHECK: encoding: [0x0f,0x01,0xc9]
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