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Features
- Operand classes for instructions
- Hints in register allocation
- Fixed register instructions (div, mul)
Is this part of "operand classes"?
Instructions
- ADD SUB SDIV UDIV SREM UREM MUL LSL LSR ASL ASR
- SEXT ZEXT
- CMP ...
- ALLOC STORE LOAD
- PTR
- CALL BRZ JMP RET
Types
- Integer (64 bits)
- Structure "{a,b,c}"
- Pointer to type "t"
Questions
- Q: Should we allow constant operands?
A:
It looks like `Con instructions are a bad idea because
they introduce spurious live ranges.
Problems
- x = y op z
if x is spilled, y can be moved to a spill location
to free one register for x, this is kind of stupid.
- [tentative fix: 4fc98da]
Phi defined variables with spill location do not work.
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