------- Comment #20 from ebotcazou at gcc dot gnu dot org 2009-01-07 06:34 ------- > Most "interesting" libcalls for x86 -m32 probably are the DImode ones, and if > subreg lowering does this for all arguments, we would have to update the > REG_REP notes in the CALL_INSN, or do a lot of DSE-like work...
What about canonicalizing the modes in CALL_INSN_FUNCTION_USAGE to word mode or smaller, like for hard registers? Would this make the DSE-like work more or less trivial? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38245
