https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116043
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|link-failure |wrong-code
--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Richard Biener from comment #8)
> (In reply to H.J. Lu from comment #7)
> > Linker only allows mov and add for @gottpoff(%rip).
>
> Though LEA might indeed be a reasonable additional opcode?
What do these do:
leaq __libc_tsd_CTYPE_B@gottpoff(%rip), %rax
vmovq (%rax), %xmm0
>From x86-64 TLS psABI:
The assembler generates for the x@gottpoff(%rip) expressions a R X86 64
GOTTPOFF
relocation for the symbol x which requests the linker to generate a GOT entry
with a
R X86 64 TPOFF64 relocation. The offset of the GOT entry relative to the end of
the
instruction is then used in the instruction. The R X86 64 TPOFF64 relocation is
pro-
cessed at program startup time by the dynamic linker by looking up the symbol x
in the
modules loaded at that point. The offset is written in the GOT entry and later
loaded
by the addq instruction.
The above code sequence looks wrong to me.
