[Bug target/87455] sse_packed_single_insn_optimal is suboptimal on Zen

[fanael4 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87455

--- Comment #1 from Fanael <fanael4 at gmail dot com> ---
Assembly diff between the two:

--- /dev/fd/63  2018-09-27 17:59:06.120507763 +0200
+++ /dev/fd/62  2018-09-27 17:59:06.120507763 +0200
@@ -7,21 +7,21 @@
 main:
 .LFB5179:
        .cfi_startproc
-       movaps  .LC0(%rip), %xmm0
-       movaps  .LC1(%rip), %xmm1
+       movdqa  .LC0(%rip), %xmm0
+       movdqa  .LC1(%rip), %xmm1
        movl    $1000000000, %eax
-       movaps  .LC2(%rip), %xmm2
+       movdqa  .LC2(%rip), %xmm2
        .p2align 4,,15
 .L2:
        paddd   %xmm2, %xmm1
-       xorps   %xmm0, %xmm2
+       pxor    %xmm0, %xmm2
        decl    %eax
        paddd   %xmm1, %xmm0
-       movaps  %xmm2, %xmm3
-       xorps   %xmm2, %xmm1
+       movdqa  %xmm2, %xmm3
+       pxor    %xmm2, %xmm1
        paddd   %xmm0, %xmm3
-       xorps   %xmm1, %xmm0
-       movaps  %xmm3, %xmm2
+       pxor    %xmm1, %xmm0
+       movdqa  %xmm3, %xmm2
        jne     .L2
        movaps  %xmm3, -40(%rsp)
        movaps  %xmm1, -56(%rsp)