diff options
Diffstat (limited to 'ARMeilleure/CodeGen/X86/Assembler.cs')
| -rw-r--r-- | ARMeilleure/CodeGen/X86/Assembler.cs | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/ARMeilleure/CodeGen/X86/Assembler.cs b/ARMeilleure/CodeGen/X86/Assembler.cs index 4568253a..70130d90 100644 --- a/ARMeilleure/CodeGen/X86/Assembler.cs +++ b/ARMeilleure/CodeGen/X86/Assembler.cs @@ -14,6 +14,8 @@ namespace ARMeilleure.CodeGen.X86 private const byte RexWPrefix = 0x48; private const byte LockPrefix = 0xf0; + private const int MaxRegNumber = 15; + [Flags] private enum InstructionFlags { @@ -842,10 +844,7 @@ namespace ARMeilleure.CodeGen.X86 { X86Register shiftReg = (X86Register)source.GetRegister().Index; - if (shiftReg != X86Register.Rcx) - { - throw new ArgumentException($"Invalid shift register \"{shiftReg}\"."); - } + Debug.Assert(shiftReg == X86Register.Rcx, $"Invalid shift register \"{shiftReg}\"."); source = null; } @@ -1080,6 +1079,8 @@ namespace ARMeilleure.CodeGen.X86 if (baseReg.Index >= 8) { + Debug.Assert((uint)baseReg.Index <= MaxRegNumber); + rexPrefix |= RexPrefix | (baseReg.Index >> 3); } @@ -1091,13 +1092,12 @@ namespace ARMeilleure.CodeGen.X86 { int indexReg = memOp.Index.GetRegister().Index; - if (indexReg == (int)X86Register.Rsp) - { - throw new ArgumentException("Using RSP as index register on the memory operand is not allowed."); - } + Debug.Assert(indexReg != (int)X86Register.Rsp, "Using RSP as index register on the memory operand is not allowed."); if (indexReg >= 8) { + Debug.Assert((uint)indexReg <= MaxRegNumber); + rexPrefix |= RexPrefix | (indexReg >> 3) << 1; } |