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CPU/NewRec: Allocate callee-saved registers before caller-saved

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Stenzek 2023-12-21 01:53:14 +10:00
parent b7c3c76014
commit 8fe6ef1fa8
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1 changed files with 10 additions and 1 deletions
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11
src/core/cpu_newrec_compiler.cpp
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@ -525,11 +525,20 @@ u32 CPU::NewRec::Compiler::GetFreeHostReg(u32 flags)
{ {
const u32 req_flags = HR_USABLE | (flags & HR_CALLEE_SAVED); const u32 req_flags = HR_USABLE | (flags & HR_CALLEE_SAVED);
u32 fallback = NUM_HOST_REGS;
for (u32 i = 0; i < NUM_HOST_REGS; i++) for (u32 i = 0; i < NUM_HOST_REGS; i++)
{ {
if ((m_host_regs[i].flags & (req_flags | HR_NEEDED | HR_ALLOCATED)) == req_flags) if ((m_host_regs[i].flags & (req_flags | HR_NEEDED | HR_ALLOCATED)) == req_flags)
return i; {
// Prefer callee-saved registers.
if (m_host_regs[i].flags & HR_CALLEE_SAVED)
return i;
else if (fallback == NUM_HOST_REGS)
fallback = i;
}
} }
if (fallback != NUM_HOST_REGS)
return fallback;
// find register with lowest counter // find register with lowest counter
u32 lowest = NUM_HOST_REGS; u32 lowest = NUM_HOST_REGS;