https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65028
--- Comment #13 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jan Hubicka from comment #12)
> I agree it is probably differnt issue, but lets see. It would help if you
> can look at the backtract and see if there is a problem between
> local/non-local calling conventions. I.e. function called with parameters
> passed on stack and consuming them in registers.
X32 passes parameters in registers, just like x86-64. I got
(gdb) disass
Dump of assembler code for function operator*(ggSpectrum const&, ggSpectrum
const&):
0x00420780 <+0>: movups (%esi),%xmm0
0x00420784 <+4>: mov %rdi,%rax
0x00420787 <+7>: movups 0x10(%esi),%xmm1
=> 0x0042078c <+12>: mulps (%edx),%xmm0
^^^^^ It isn't aligned to 32 bytes.
0x00420790 <+16>: mulps 0x10(%edx),%xmm1
0x00420795 <+21>: movups %xmm0,(%edi)
0x00420799 <+25>: movups %xmm1,0x10(%edi)
0x0042079e <+30>: retq
End of assembler dump.
(gdb) p/x $edx
$2 = 0xffffcc48
(gdb) f 1
#1 0x004452d4 in __base_ctor (v=..., z=..., y=..., x=..., bPrimary=...,
gPrimary=..., rPrimary=..., this=0xffffbf60) at ./ggPhotometer.h:53
53 colorMatrix[0][0] = (cieX * rPrimary).area();
(gdb) p cieX
$3 = {data = {0.146008939, 0.279831082, 0.0505069345, 0.202513069,
0.729846954, 0.957131386, 0.414069265, 0.0614523999}}
(gdb) p rPrimary
$4 = (const struct ggSpectrum &) @0xffffcc48: {data = {0, 0, 0, 0,
0.0899555609, 0.550044477, 0.959999979, 1}}
(gdb) ...
0x004452c4 <+1620>: mov (%esp),%rdx
0x004452c9 <+1625>: mov %r15,%rsi
0x004452cc <+1628>: mov %r14,%rdi
0x004452cf <+1631>: callq 0x420780 <operator*(ggSpectrum const&,
ggSpectrum const&)>
=> 0x004452d4 <+1636>: mov %r14,%rdi
...
Breakpoint 1, 0x004452cf in __base_ctor (v=..., z=..., y=..., x=...,
bPrimary=..., gPrimary=..., rPrimary=..., this=0xffffbf60)
at ./ggPhotometer.h:53
53 colorMatrix[0][0] = (cieX * rPrimary).area();
(gdb) p/x $rdi
$6 = 0xffffbf40
(gdb) p/x $rsi
$7 = 0xffffbfa8
(gdb) p/x $rdx
$8 = 0xffffcc48
(gdb) p this
$9 = (struct ggPhotometer * const) 0xffffbf60
(gdb) p &cieX
$10 = (struct ggSpectrum *) 0xffffbfa8
(gdb) p/x &rPrimary
$11 = 0xffffcc48
(gdb) p/x $pc
$13 = 0x4452cf
(gdb) p rPrimary
$1 = (const struct ggSpectrum &) @0xffffcc48: {data = {0, 0, 0, 0,
0.0899555609, 0.550044477, 0.959999979, 1}}
(gdb)
Why do we think rPrimary is 16-byte aligned when it is only 8-byte aligned?
