On 2013-03-22 02:27, Kai Tietz wrote:
Hi,this patch fixes PR/52790 and supports for x64 Windows targets the use of large and medium code-model. This feature is required for upcoming new cygwin x64 target, which uses full 48-bit available address-space of x64 Windows. The cygwin-target depends on pseudo-relocation-feature, which operates on instruction relocations. This can lead for x86_64 to issues, due instructions are in general signed-32bit-pc-relative relocated. So distances can become too wide for pseudo-relocation. Due for functions we generate anyway on pe-coff targets jump-stubs, we just need to make sure that variables are accessed via reference-pointer-variables. So we add for them in medium model .refptr-variables. In large model we using for external (therefore possibly pseudo-relocated) symbols also indirect-addressing via refptr-stubs. To avoid same issues as we noticed on cygwin64, I want to change code-model default to medium also for native-windows x64 target. ChangeLog 2013-03-22 Kai Tietz <kti...@redhat.com> PR target/52790 * config/i386/cygming.h (SUB_TARGET_RECORD_STUB): New sub-target macro. * config/i386/i386-protos.h (i386_pe_record_stub): Add new prototype. * config/i386/i386.c (legitimize_pe_coff_extern_decl): New static function. (legitimize_pe_coff_symbol): Likewise. (is_imported_p): New helper-function. (ix86_option_override_internal): Make MEDIUM_PIC the default code-model for Windows x64 targets. (ix86_expand_prologue): Optimize for pe-coff targets. (ix86_expand_split_stack_prologue): Adjust for pe-coff targets. (legitimate_pic_address_disp_p): Adjust for x64 pe-coff to support medium/large code-model. (legitimize_pic_address): Likewise. (legitimize_tls_address): Likewise. (ix86_expand_call): Likewise. (x86_output_mi_thunk): Likewise. (get_dllimport_decl): Add new beimport argument. (construct_plt_address): Don't assert for x64 pe-coff targets. * config/i386/i386.h (PIC_OFFSET_TABLE_REGNUM): Adjust for x64 pe-coff targets. (SYMBOL_FLAG_STUBVAR): New macro. (SYMBOL_REF_STUBVAR_P): Likewise. * config/i386/winnt.c (stub_list): New structure. (stub_head): New local variable. (i386_pe_record_stub): New function. (i386_pe_file_end): Emit refptr-stubs.
Ok. r~
