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Fixed edge case with switch case jump table detection when lo16 immediate is exactly 0

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Mr-Wiseguy 2024-09-11 23:39:39 -04:00
parent 14f5d78157
commit 305cc76448
1 changed files with 4 additions and 2 deletions
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6
src/analysis.cpp
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@ -158,9 +158,11 @@ bool analyze_instruction(const rabbitizer::InstructionCpu& instr, const N64Recom
}
// If the base register has a valid lui state and a valid addend before this, then this may be a load from a jump table
else if (reg_states[base].valid_lui && reg_states[base].valid_addend) {
// Exactly one of the lw and the base reg should have a valid lo16 value
// Exactly one of the lw and the base reg should have a valid lo16 value. However, the lo16 may end up just being zero by pure luck,
// so allow the case where the lo16 immediate is zero and the register state doesn't have a valid addiu immediate.
// This means the only invalid case is where they're both true.
bool nonzero_immediate = imm != 0;
if (nonzero_immediate != reg_states[base].valid_addiu) {
if (!(nonzero_immediate && reg_states[base].valid_addiu)) {
uint32_t lo16;
if (nonzero_immediate) {
lo16 = (int16_t)imm;