With -fno-plt, we don't have to reject even direct calls as sibcall
candidates.
This patch depends on '-fplt' flag that is introduced in another patch.
This patch requires that with -fno-plt all sibcall candidates go through
prepare_call_address that transforms the call to a GOT lookup.
OK?
* config/i386/i386.c (ix86_function_ok_for_sibcall): Check flag_plt.
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index f29e053..b734350 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -5448,12 +5448,13 @@ ix86_function_ok_for_sibcall (tree decl, tree exp)
/* If we are generating position-independent code, we cannot sibcall
optimize any indirect call, or a direct call to a global function,
as the PLT requires %ebx be live. (Darwin does not have a PLT.) */
if (!TARGET_MACHO
&& !TARGET_64BIT
&& flag_pic
+ && flag_plt
&& (decl && !targetm.binds_local_p (decl)))
return false;
/* If we need to align the outgoing stack, then sibcalling would
unalign the stack, which may break the called function. */
if (ix86_minimum_incoming_stack_boundary (true)
