http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53853
Uros Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Uros Bizjak <ubizjak at gmail dot com> 2012-07-05 12:07:31
UTC ---
It turned out that -mcmodel -fPIC also ICEd on x86_64-pc-linux-gnu.
We need additional part to handle CM_LARGE_PIC, basically:
--cut here--
@@ -33057,6 +33059,10 @@ x86_output_mi_thunk (FILE *file,
emit_jump_insn (gen_indirect_jump (fnaddr));
else
{
+ if (ix86_cmodel == CM_LARGE_PIC
+ && GET_CODE (fnaddr) == SYMBOL_REF)
+ fnaddr = construct_plt_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--
to create:
.size _ZN12ScriptString12CreateStringEPKc,
.-_ZN12ScriptString12CreateStringEPKc
.set .LTHUNK0,_ZN12ScriptString12CreateStringEPKc
.p2align 4,,15
.globl _ZThn8_N12ScriptString12CreateStringEPKc
.type _ZThn8_N12ScriptString12CreateStringEPKc, @function
_ZThn8_N12ScriptString12CreateStringEPKc:
.LFB1:
.cfi_startproc
subq $8, %rdi
movabsq $.LTHUNK0@PLTOFF, %r10
addq %rbx, %r10
jmp *%r10
.cfi_endproc
I'd like to ask Jakub fo opinion here. The generated code otherwise works OK
for a couple of tests (g++.dg/inherit/thunk*.C) when compiled with
-mcmodel=large -fPIC.
