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CPU/CodeCache: Don't choke on indirect -> direct branch in delay slot

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This commit is contained in:
Connor McLaughlin 2021-03-06 01:33:12 +10:00
parent 56b522a902
commit bf5f53e1d1
2 changed files with 5 additions and 5 deletions
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9
src/core/cpu_code_cache.cpp
View file

@ -494,7 +494,6 @@ bool CompileBlock(CodeBlock* block)
{
u32 pc = block->GetPC();
bool is_branch_delay_slot = false;
bool is_unconditional_branch_delay_slot = false;
bool is_load_delay_slot = false;
#if 0
@ -519,6 +518,7 @@ bool CompileBlock(CodeBlock* block)
cbi.is_branch_delay_slot = is_branch_delay_slot;
cbi.is_load_delay_slot = is_load_delay_slot;
cbi.is_branch_instruction = IsBranchInstruction(cbi.instruction);
cbi.is_direct_branch_instruction = IsDirectBranchInstruction(cbi.instruction);
cbi.is_unconditional_branch_instruction = IsUnconditionalBranchInstruction(cbi.instruction);
cbi.is_load_instruction = IsMemoryLoadInstruction(cbi.instruction);
cbi.is_store_instruction = IsMemoryStoreInstruction(cbi.instruction);
@ -543,9 +543,10 @@ bool CompileBlock(CodeBlock* block)
if (is_branch_delay_slot && cbi.is_branch_instruction)
{
if (!is_unconditional_branch_delay_slot)
const CodeBlockInstruction& prev_cbi = block->instructions.back();
if (!prev_cbi.is_unconditional_branch_instruction || !prev_cbi.is_direct_branch_instruction)
{
Log_WarningPrintf("Conditional branch delay slot at %08X, skipping block", cbi.pc);
Log_WarningPrintf("Conditional or indirect branch delay slot at %08X, skipping block", cbi.pc);
return false;
}
if (!IsDirectBranchInstruction(cbi.instruction))
@ -555,7 +556,6 @@ bool CompileBlock(CodeBlock* block)
}
// change the pc for the second branch's delay slot, it comes from the first branch
const CodeBlockInstruction& prev_cbi = block->instructions.back();
pc = GetBranchInstructionTarget(prev_cbi.instruction, prev_cbi.pc);
Log_DevPrintf("Double branch at %08X, using delay slot from %08X -> %08X", cbi.pc, prev_cbi.pc, pc);
}
@ -570,7 +570,6 @@ bool CompileBlock(CodeBlock* block)
// if this is a branch, we grab the next instruction (delay slot), and then exit
is_branch_delay_slot = cbi.is_branch_instruction;
is_unconditional_branch_delay_slot = cbi.is_unconditional_branch_instruction;
// same for load delay
is_load_delay_slot = cbi.has_load_delay;

1
src/core/cpu_code_cache.h
View file

@ -52,6 +52,7 @@ struct CodeBlockInstruction
u32 pc;
bool is_branch_instruction : 1;
bool is_direct_branch_instruction : 1;
bool is_unconditional_branch_instruction : 1;
bool is_branch_delay_slot : 1;
bool is_load_instruction : 1;