[Bug target/102105] [10/11/12 Regression] x86_64: ABI break with vector in union and -mno-mmx -mavx

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102105

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
diff between r271212 and r271213:

$ diff -up ~/y12.s ~/y13.s
--- /home/mpolacek/y12.s        2021-08-27 16:25:46.000000000 -0400
+++ /home/mpolacek/y13.s        2021-08-27 16:25:53.000000000 -0400
@@ -87,8 +87,8 @@ test_v1di:
        movq    %rsp, %rbp
 .LCFI10:
        movq    g_v1di(%rip), %rax
-       movq    %rax, %rdi
-       movl    $0, %eax
+       vmovq   %rax, %xmm0
+       movl    $1, %eax
        call    pass_v1di
        nop
        popq    %rbp