2013-01-22 08:54:49 +00:00
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## Instructions
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```
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stbu
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lwzu
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addx
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addix
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addic
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addzex
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subfx
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subfex
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subficx
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mulli
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mullwx
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divwux
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andix
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orx
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rlwinmx
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rldiclx
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extsbx
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slwx
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srawix
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# can be no-op
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dcbt
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dcbtst
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twi
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```
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## Codegen
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2013-01-22 18:50:20 +00:00
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### Tracing
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Tracing modes:
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- off (0)
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- syscalls (1)
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- fn calls (2)
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- all instructions (3)
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Inject extern functions into module:
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- XeTraceKernelCall(caller_ia, cia, name, state)
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- XeTraceUserCall(caller_ia, cia, name, state)
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- XeTraceInstruction(cia, name, state)
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### Calling convention
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Experiment with fastcc? May need typedef fn ptrs to call into the JITted code.
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2013-01-22 08:54:49 +00:00
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### Indirect branches (ctr/lr)
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emit_control.cc XeEmitBranchTo
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Need to take the value in LR/CTR and do something with it.
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2013-01-22 18:50:20 +00:00
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Return path:
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- In SDB see if the function follows the 'return' semantic:
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- mfspr LR / mtspr LR/CTR / bcctr -- at end?
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- In codegen add a BB that is just return.
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- If a block 'returns', branch to the return BB.
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Tail calls:
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- If in a call BB check next BB.
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- If next is a return, optimize to a tail call.
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2013-01-22 08:54:49 +00:00
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Fast path:
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- Every time LR would be stashed, add the value of LR (some NIA) to a lookup
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table.
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- When doing an indirect branch first lookup the address in the table.
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- If not found, slow path, else jump.
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Slow path:
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- Call out and do an SDB lookup.
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- If found, return, add to lookup table, and jump.
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- If not found, need new function codegen!
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### Caching of register values in basic blocks
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Right now the SSA values seem to leak from the blocks somehow. All caching
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is disabled.
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```
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