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...ld be this: sext: sextb r1 add r1,r3 sextw r2 add r1,r2 jmp [r30] The debug output from LLVM shows this: ********** REWRITING TWO-ADDR INSTRS ********** ********** Function: sext %reg1028<def> = sextb_r %reg1025<kill> prepend: %reg1028<def> = mov_rr %reg1025<kill> rewrite to: %reg1028<def> = sextb_r %reg1028 ... %reg1030<def> = sextw_r %reg1026<kill> prepend: %reg1030<def> = mov_rr %reg1026<kill> rewrite to: %reg1030<def> = sextw_r %reg1030 Because sextb_r and sext...

Greg McGary wrote: > ********** REWRITING TWO-ADDR INSTRS ********** > ********** Function: sext > %reg1028<def> = sextb_r %reg1025<kill> > prepend: %reg1028<def> = mov_rr %reg1025<kill> > rewrite to: %reg1028<def> = sextb_r %reg1028 > ... > %reg1030<def> = sextw_r %reg1026<kill> > prepend: %reg1030<def> = mov_rr %reg1026<kill> > rewrite to: %reg1030<def> = sextw_r %reg1030...