http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54142
--- Comment #6 from Paul H. Hargrove <PHHargrove at lbl dot gov> 2012-07-31 17:59:31 UTC --- (In reply to comment #2) > sldi and srdi are both standard PowerPC64 instructions. IBM's "Programming Environments Manual for 64-Bit Microprocessors" lists sldi and srdi as "Simplified Mnemonics". Perhaps using the canonical instructions is a simple resolution to this bug? Shift left immediate sldi rA,rS,n (n < 64) rldicr rA,rS,n,63 – n Shift right immediate srdi rA,rS,n (n < 64) rldicl rA,rS,64 – n,n Additionally, there may be a GAS bug lurking here as well.