paoda
/
zba
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

fix(cpu): fix conditions for GT cond

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-01-14 04:19:54 -04:00
parent 37bd6758fb
commit 070322064d
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/cpu.zig
View File

@ -102,7 +102,7 @@ fn checkCond(cpsr: *const PSR, opcode: u32) bool {
// TODO: Should I implement an enum? // TODO: Should I implement an enum?
return switch (@truncate(u4, opcode >> 28)) { return switch (@truncate(u4, opcode >> 28)) {
0x0 => cpsr.z.read(), // EQ - Equal 0x0 => cpsr.z.read(), // EQ - Equal
0x1 => !cpsr.z.read(), // NEQ - Not equal 0x1 => !cpsr.z.read(), // NE - Not equal
0x2 => cpsr.c.read(), // CS - Unsigned higher or same 0x2 => cpsr.c.read(), // CS - Unsigned higher or same
0x3 => !cpsr.c.read(), // CC - Unsigned lower 0x3 => !cpsr.c.read(), // CC - Unsigned lower
0x4 => cpsr.n.read(), // MI - Negative 0x4 => cpsr.n.read(), // MI - Negative
@ -113,7 +113,7 @@ fn checkCond(cpsr: *const PSR, opcode: u32) bool {
0x9 => !cpsr.c.read() and cpsr.z.read(), // LS - unsigned lower or same 0x9 => !cpsr.c.read() and cpsr.z.read(), // LS - unsigned lower or same
0xA => cpsr.n.read() == cpsr.v.read(), // GE - Greater or equal 0xA => cpsr.n.read() == cpsr.v.read(), // GE - Greater or equal
0xB => cpsr.n.read() != cpsr.v.read(), // LT - Less than 0xB => cpsr.n.read() != cpsr.v.read(), // LT - Less than
0xC => !cpsr.z.read() and (cpsr.n.read() == cpsr.z.read()), // GT - Greater than 0xC => !cpsr.z.read() and (cpsr.n.read() == cpsr.v.read()), // GT - Greater than
0xD => cpsr.z.read() or (cpsr.n.read() != cpsr.v.read()), // LE - Less than or equal 0xD => cpsr.z.read() or (cpsr.n.read() != cpsr.v.read()), // LE - Less than or equal
0xE => true, // AL - Always 0xE => true, // AL - Always
0xF => std.debug.panic("[CPU] 0xF is a reserved condition field", .{}), 0xF => std.debug.panic("[CPU] 0xF is a reserved condition field", .{}),