search for: instrinisic

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2010 Jan 04
5
[LLVMdev] How to bind a register variable with a given general purpose register?
Hi everyone, There are 16 GPRs in my RISC, but in fact GPR13 is read-only and connected to output of an A/D converter. It would be very convenient if i could bind a register variable with GPR13. Because i am a newbie i don't know how my llvm backend can support that. I plan to implement it as below. A. first declare a global variable in c-code int ADC asm("GPR13"); B. If
2010 Jan 04
0
[LLVMdev] 答复: [LLVMdev] How to bind a register variable with a given general purpose register?
....readadcreg()". 3. map any read to the variable marked with __attribute__((GPR13)) to llvm.zhu.readadcreg() instead of "load" instruction 4. assign gpr13 to a special register class like "gpr13class" instead of gprclass, so gpr13 will not be allocated as other gpr. 5. lower instrinisic functions "llvm.zhu.readadcreg()" to register node "gpr13" in your backend. regards --ether On 2010-1-4 18:01, Demon(Xiangyang) Zhu 朱向阳 wrote: > Hi Ether, > > The hardware had been fixed now. > If map it to memory space, it will cost another instruction cycle to...
2010 Jan 04
0
[LLVMdev] 答复: 答复: [LLVMdev] How to bind a register variable with a given general purpose register?
...3. map any read to the variable marked with __attribute__((GPR13)) to > llvm.zhu.readadcreg() instead of "load" instruction > 4. assign gpr13 to a special register class like "gpr13class" instead of > gprclass, so gpr13 will not be allocated as other gpr. > 5. lower instrinisic functions "llvm.zhu.readadcreg()" to register node > "gpr13" in your backend. > > regards > > --ether > > On 2010-1-4 18:01, Demon(Xiangyang) Zhu 朱向阳 wrote: > >> Hi Ether, >> >> The hardware had been fixed now. >> If map it to m...