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Improve the readability of branch instructions in the M6502 processor implementation.

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon 2019-02-20 22:19:38 +00:00
parent c400f37201
commit 4ee184eaf4
1 changed files with 6 additions and 4 deletions
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10
M6502/M6502.cs
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@ -204,7 +204,7 @@ namespace EightBit
case 0x2e: this.BusReadModifyWrite(this.ROL(this.AM_Absolute())); break; // ROL (absolute) case 0x2e: this.BusReadModifyWrite(this.ROL(this.AM_Absolute())); break; // ROL (absolute)
case 0x2f: this.RLA(this.AM_Absolute()); break; // *RLA (absolute) case 0x2f: this.RLA(this.AM_Absolute()); break; // *RLA (absolute)
case 0x30: this.Branch(this.Negative != 0); break; // BMI (relative) case 0x30: this.Branch(this.Negative); break; // BMI (relative)
case 0x31: this.A = this.AndR(this.A, this.AM_IndirectIndexedY()); break; // AND (indirect indexed Y) case 0x31: this.A = this.AndR(this.A, this.AM_IndirectIndexedY()); break; // AND (indirect indexed Y)
case 0x32: break; case 0x32: break;
case 0x33: this.RLA(this.AM_IndirectIndexedY()); break; // *RLA (indirect indexed Y) case 0x33: this.RLA(this.AM_IndirectIndexedY()); break; // *RLA (indirect indexed Y)
@ -272,7 +272,7 @@ namespace EightBit
case 0x6e: this.BusReadModifyWrite(this.ROR(this.AM_Absolute())); break; // ROR (absolute) case 0x6e: this.BusReadModifyWrite(this.ROR(this.AM_Absolute())); break; // ROR (absolute)
case 0x6f: this.RRA(this.AM_Absolute()); break; // *RRA (absolute) case 0x6f: this.RRA(this.AM_Absolute()); break; // *RRA (absolute)
case 0x70: this.Branch(this.Overflow != 0); break; // BVS (relative) case 0x70: this.Branch(this.Overflow); break; // BVS (relative)
case 0x71: this.A = this.ADC(this.A, this.AM_IndirectIndexedY()); break; // ADC (indirect indexed Y) case 0x71: this.A = this.ADC(this.A, this.AM_IndirectIndexedY()); break; // ADC (indirect indexed Y)
case 0x72: break; case 0x72: break;
case 0x73: this.RRA(this.AM_IndirectIndexedY()); break; // *RRA (indirect indexed Y) case 0x73: this.RRA(this.AM_IndirectIndexedY()); break; // *RRA (indirect indexed Y)
@ -340,7 +340,7 @@ namespace EightBit
case 0xae: this.X = this.Through(this.AM_Absolute()); break; // LDX (absolute) case 0xae: this.X = this.Through(this.AM_Absolute()); break; // LDX (absolute)
case 0xaf: this.A = this.X = this.Through(this.AM_Absolute()); break; // *LAX (absolute) case 0xaf: this.A = this.X = this.Through(this.AM_Absolute()); break; // *LAX (absolute)
case 0xb0: this.Branch(this.Carry != 0); break; // BCS (relative) case 0xb0: this.Branch(this.Carry); break; // BCS (relative)
case 0xb1: this.A = this.Through(this.AM_IndirectIndexedY()); break; // LDA (indirect indexed Y) case 0xb1: this.A = this.Through(this.AM_IndirectIndexedY()); break; // LDA (indirect indexed Y)
case 0xb2: break; case 0xb2: break;
case 0xb3: this.A = this.X = this.Through(this.AM_IndirectIndexedY()); break; // *LAX (indirect indexed Y) case 0xb3: this.A = this.X = this.Through(this.AM_IndirectIndexedY()); break; // *LAX (indirect indexed Y)
@ -407,7 +407,7 @@ namespace EightBit
case 0xed: this.A = this.SBC(this.A, this.AM_Absolute()); break; // SBC (absolute) case 0xed: this.A = this.SBC(this.A, this.AM_Absolute()); break; // SBC (absolute)
case 0xee: this.BusReadModifyWrite(this.INC(this.AM_Absolute())); break; // *ISB (absolute) case 0xee: this.BusReadModifyWrite(this.INC(this.AM_Absolute())); break; // *ISB (absolute)
case 0xf0: this.Branch(this.Zero != 0); break; // BEQ (relative) case 0xf0: this.Branch(this.Zero); break; // BEQ (relative)
case 0xf1: this.A = this.SBC(this.A, this.AM_IndirectIndexedY()); break; // SBC (indirect indexed Y) case 0xf1: this.A = this.SBC(this.A, this.AM_IndirectIndexedY()); break; // SBC (indirect indexed Y)
case 0xf2: break; case 0xf2: break;
case 0xf3: this.ISB(this.AM_IndirectIndexedY()); break; // *ISB (indirect indexed Y) case 0xf3: this.ISB(this.AM_IndirectIndexedY()); break; // *ISB (indirect indexed Y)
@ -726,6 +726,8 @@ namespace EightBit
this.AdjustNegative(datum); this.AdjustNegative(datum);
} }
private void Branch(int condition) => this.Branch(condition != 0);
private void Branch(bool condition) private void Branch(bool condition)
{ {
var destination = this.Address_relative_byte(); var destination = this.Address_relative_byte();