[Bug target/114591] [12/13/14 Regression] register allocators introduce an extra load operation since gcc-12

["ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114591

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #2)
> This changed with r12-5584-gca5667e867252db3c8642ee90f55427149cd92b6

Strange, if I revert the constraints to the previous setting with: 

--cut here--
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 10ae3113ae8..262dd25a8e0 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -2870,9 +2870,9 @@ (define_peephole2

 (define_insn "*movhi_internal"
   [(set (match_operand:HI 0 "nonimmediate_operand"
-    "=r,r,r,m ,*k,*k ,r ,m ,*k ,?r,?*v,*Yv,*v,*v,jm,m")
+    "=r,r,r,m ,*k,*k ,*r ,*m ,*k ,?r,?v,*Yv,*v,*v,*jm,*m")
        (match_operand:HI 1 "general_operand"
-    "r ,n,m,rn,r ,*km,*k,*k,CBC,*v,r  ,C  ,*v,m ,*x,*v"))]
+    "r ,n,m,rn,*r ,*km,*k,*k,CBC,v,r  ,C  ,v,m ,x,v"))]
   "!(MEM_P (operands[0]) && MEM_P (operands[1]))
    && ix86_hardreg_mov_ok (operands[0], operands[1])"
 {
--cut here--

I still get:

        movl    v1(%rip), %eax  # 6     [c=6 l=6]  *zero_extendsidi2/3
        movq    %rax, v2(%rip)  # 16    [c=4 l=7]  *movdi_internal/5
        movzwl  v1(%rip), %eax  # 7     [c=5 l=7]  *movhi_internal/2