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Properly implement unaligned load/store instructions

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Mr-Wiseguy 2023-05-21 17:42:25 -04:00
parent 3db07f5b26
commit 9321a60f28
1 changed files with 18 additions and 8 deletions
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26
src/recompilation.cpp
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@ -299,7 +299,7 @@ bool process_instruction(const RecompPort::Context& context, const RecompPort::F
case InstrId::cpu_sb:
print_line("MEM_B({}, {}{}) = {}{}", signed_imm_string, ctx_gpr_prefix(base), base, ctx_gpr_prefix(rt), rt);
break;
// TODO lwl, lwr
// Unaligned loads
// examples:
// reg = 11111111 01234567
// mem @ x = 89ABCDEF
@ -314,20 +314,30 @@ bool process_instruction(const RecompPort::Context& context, const RecompPort::F
// LWR x + 2 -> 00000000 0189ABCD
// LWR x + 3 -> FFFFFFFF 89ABCDEF
case InstrId::cpu_lwl:
print_line("{}{} = do_lwl(rdram, {}, {}{})", ctx_gpr_prefix(rt), rt, signed_imm_string, ctx_gpr_prefix(base), base);
//print_line("{}{} = MEM_WL({}, {}{})", ctx_gpr_prefix(rt), rt, signed_imm_string, ctx_gpr_prefix(base), base);
print_line("{}{} = do_lwl(rdram, {}{}, {}, {}{})", ctx_gpr_prefix(rt), rt, ctx_gpr_prefix(rt), rt, signed_imm_string, ctx_gpr_prefix(base), base);
break;
case InstrId::cpu_lwr:
//print_line("{}{} = do_lwr(rdram, {}, {}{})", ctx_gpr_prefix(rt), rt, signed_imm_string, ctx_gpr_prefix(base), base);
//print_line("//{}{} = MEM_WR({}, {}{})", ctx_gpr_prefix(rt), rt, signed_imm_string, ctx_gpr_prefix(base), base);
print_line("{}{} = do_lwr(rdram, {}{}, {}, {}{})", ctx_gpr_prefix(rt), rt, ctx_gpr_prefix(rt), rt, signed_imm_string, ctx_gpr_prefix(base), base);
break;
// Unaligned stores
// examples:
// reg = 11111111 01234567
// mem @ x = 89ABCDEF
// SWL x + 0 -> 01234567
// SWL x + 1 -> 89012345
// SWL x + 2 -> 89AB0123
// SWL x + 3 -> 89ABCD01
// SWR x + 0 -> 67ABCDEF
// SWR x + 1 -> 4567CDEF
// SWR x + 2 -> 234567EF
// SWR x + 3 -> 01234567
case InstrId::cpu_swl:
print_line("do_swl(rdram, {}, {}{}, {}{})", signed_imm_string, ctx_gpr_prefix(base), base, ctx_gpr_prefix(rt), rt);
//print_line("MEM_WL({}, {}{}) = {}{}", signed_imm_string, ctx_gpr_prefix(base), base, ctx_gpr_prefix(rt), rt);
break;
case InstrId::cpu_swr:
//print_line("do_swr(rdram, {}, {}{}, {}{})", signed_imm_string, ctx_gpr_prefix(base), base, ctx_gpr_prefix(rt), rt);
//print_line("//MEM_WR({}, {}{}) = {}{}", signed_imm_string, ctx_gpr_prefix(base), base, ctx_gpr_prefix(rt), rt);
print_line("do_swr(rdram, {}, {}{}, {}{})", signed_imm_string, ctx_gpr_prefix(base), base, ctx_gpr_prefix(rt), rt);
break;
// Branches