------- Comment #15 from redi at gcc dot gnu dot org 2010-04-12 18:21 ------- (In reply to comment #14) > > Why is that instruction being issued when compiling amd64/libgfortran? > > Don't worry about this insn, it works for core2.
GNU as 2.15 doesn't believe you :-) $ echo sahf > test.s $ /usr/sfw/bin/gas test.s $ /usr/sfw/bin/gas --64 test.s test.s: Assembler messages: test.s:1: Error: suffix or operands invalid for `sahf' configure only tests it the first way, which is 32-bit there should be a configure test using --64 if it's going to be issued in 64-bit mode -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43733