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instmem
2015 Jun 12
2
[LLVMdev] Prevent instruction selection from clobbering an implicit data dependence through flags?
Hi,
In my target, certain intrinsic functions read or write the machine's flag registers. Some of my benchmarks rely on implicit data dependences among such intrinsics. How can I specify that these intrinsics carry this dependence, and that this dependence should be preserved through instruction selection?
For example, suppose I have this snippet of IR:
; (i) Write to flags
tail call