http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48853
--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> 2011-05-06 22:38:34 UTC --- loc_descriptor change in http://gcc.gnu.org/ml/gcc-cvs/2011-04/msg01406.html @@ -14469,7 +15018,10 @@ up an entire register. For now, just assume that it is legitimate to make the Dwarf info refer to the whole register which contains the given subreg. */ - loc_result = loc_descriptor (SUBREG_REG (rtl), mode, initialized); + if (REG_P (SUBREG_REG (rtl)) && subreg_lowpart_p (rtl)) + loc_result = loc_descriptor (SUBREG_REG (rtl), mode, initialized); + else + goto do_default; break; case REG: doesn't handle: Breakpoint 5, loc_descriptor (rtl=0x7ffff0b24c30, mode=SImode, initialized=VAR_INIT_STATUS_INITIALIZED) at /export/gnu/import/git/gcc-x32/gcc/dwarf2out.c:15035 15035 if ((REG_P (SUBREG_REG (rtl)) (gdb) call debug_rtx (rtl) (subreg:SI (symbol_ref:DI ("a") [flags 0x2] <var_decl 0x7ffff0a9c500 a>) 0) (gdb) It happens when Pmode != ptr_mode in gcc.dg/guality/inline-params.c.
