http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48853
--- Comment #19 from H.J. Lu <hjl.tools at gmail dot com> 2011-05-06 22:43:36 UTC --- (In reply to comment #17) > 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) > Also Breakpoint 5, loc_descriptor (rtl=0x7ffff086be88, 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)) (subreg:SI (const:DI (plus:DI (symbol_ref:DI ("a") [flags 0x2] <var_decl 0x7ffff0993e60 a>) (const_int 4 [0x4]))) 0) (gdb) gcc.dg/guality/pr45882.c failures may expose other issues.
