http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53853
--- Comment #5 from Uros Bizjak <ubizjak at gmail dot com> 2012-07-06 07:45:21
UTC ---
We can leave all the magic to legitimize_pic_address, so following alternative
patch is much clearer:
--cut here--
Index: i386.c
===================================================================
--- i386.c (revision 189310)
+++ i386.c (working copy)
@@ -33057,6 +33057,10 @@ x86_output_mi_thunk (FILE *file,
emit_jump_insn (gen_indirect_jump (fnaddr));
else
{
+ if (flag_pic && SYMBOLIC_CONST (fnaddr))
+ fnaddr = legitimize_pic_address (fnaddr,
+ gen_rtx_REG (Pmode, tmp_regno));
+
if (!sibcall_insn_operand (fnaddr, word_mode))
{
tmp = gen_rtx_REG (word_mode, tmp_regno);
--cut here--
With this patch, we get:
.size _ZN1D4foo2Ev, .-_ZN1D4foo2Ev
.set .LTHUNK0,_ZN1D4foo2Ev
.p2align 4,,15
.globl _ZThn16_N1D4foo2Ev
.type _ZThn16_N1D4foo2Ev, @function
_ZThn16_N1D4foo2Ev:
.LFB15:
.cfi_startproc
subq $16, %rdi
movabsq $.LTHUNK0@GOTOFF, %r10
addq %rbx, %r10
jmp *%r10
.cfi_endproc
.LFE15:
.size _ZThn16_N1D4foo2Ev, .-_ZThn16_N1D4foo2Ev
So, load off GOTOFF table, which works as well.
