https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70155
Bug ID: 70155
Summary: Use SSE for TImode load/store
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: hjl.tools at gmail dot com
CC: ubizjak at gmail dot com, ysrumyan at gmail dot com
Target Milestone: ---
Target: x86-64
[hjl@gnu-mic-2 int128]$ cat x.i
extern __int128 a, b;
struct foo
{
__int128 i;
}__attribute__ ((packed));
extern struct foo x, y;
void
foo (void)
{
a = b;
x = y;
}
[hjl@gnu-mic-2 int128]$ gcc -S -O2 x.i
[hjl@gnu-mic-2 int128]$ cat x.s
.file "x.i"
.section .text.unlikely,"ax",@progbits
.LCOLDB0:
.text
.LHOTB0:
.p2align 4,,15
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
movq b(%rip), %rax
movq b+8(%rip), %rdx
movq %rax, a(%rip)
movq %rdx, a+8(%rip)
movq y(%rip), %rax
movq y+8(%rip), %rdx
movq %rax, x(%rip)
movq %rdx, x+8(%rip)
ret
.cfi_endproc
.LFE0:
.size foo, .-foo
.section .text.unlikely
.LCOLDE0:
.text
.LHOTE0:
.ident "GCC: (GNU) 5.3.1 20160212 (Red Hat 5.3.1-4)"
.section .note.GNU-stack,"",@progbits
[hjl@gnu-mic-2 int128]$
We could generate
foo:
.LFB0:
.cfi_startproc
movdqa b(%rip), %xmm0
movaps %xmm0, a(%rip)
movdqu y(%rip), %xmm0
movups %xmm0, x(%rip)
ret
.cfi_endproc
.LFE0:
