[Bug rtl-optimization/110215] RA fails to allocate register when loop invariant lives across calls and eh

[wwwhhhyyy333 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110215

--- Comment #6 from Hongyu Wang <wwwhhhyyy333 at gmail dot com> ---
Thanks for the fix, now for the attached test, main loop will not have any
load. 

There is a remaining issue that the loop epilogue still contains load from
stack and constant pool

.L9:
        movslq  %edx, %rax
        movss   72(%rsp), %xmm5
        salq    $2, %rax
        leaq    (%rbx,%rax), %rcx
        movaps  %xmm5, %xmm1
        subss   (%rcx), %xmm1
        andps   .LC4(%rip), %xmm1
        movss   %xmm1, (%rcx)
        leal    1(%rdx), %ecx
        addss   %xmm1, %xmm0
        cmpl    %ecx, %r12d
        jle     .L8

IRA dump shows the pseudos does not have conflict but they still failed to be
allocated with register. This issue does not exist on aarch64.