search for: imp_def

...? Let me use MBlaze to explain that: compile option: clang -target mblaze -O2 -S -mllvm -unroll-threshold=1024 -mllvm -unroll-allow-partial demo.c -o demo.s -mllvm -print-after-all The IR after Virtual Register Rewriter whill show this situation as below: " BRLID R15, ga at printf, %R3<imp_def,dead>, %R4<imp_def,dead>, %R5<imp_def,dead>... %R4<def>=LWI <fi#5>,0 ADJCALLSTACKUP 68, 0, %R1 <imp_def>, %R1<imp_def> " The instruction " %R4<def>=LWI <fi#5>,0" loads value from the stack, and it will use SP register a...