------- Comment #29 from ubizjak at gmail dot com 2008-03-20 00:01 -------
Now we generate:
-m32 -mmmx -msse2:
test:
subl $20, %esp
movl w, %eax
movl w+4, %edx
movl %ebx, 12(%esp)
movl %esi, 16(%esp)
movl %eax, (%esp)
movzwl (%esp), %ecx
movl %edx, 4(%esp)
movzwl 2(%esp), %ebx
movzwl 4(%esp), %esi
movzwl 6(%esp), %eax
addl %ecx, %ecx
addl %ebx, %ebx
addl %esi, %esi
addl %eax, %eax
movw %bx, w+2
movl 12(%esp), %ebx
movw %si, w+4
movl 16(%esp), %esi
movw %ax, w+6
movl w+4, %edx
movw %cx, w
movl w, %eax
movl %edx, dw+4
movl %eax, dw
addl $20, %esp
ret
-m64 -mmmx -msse2:
test:
movabsq $9223231297218904063, %rax
andq w(%rip), %rax
addq %rax, %rax
movq %rax, w(%rip)
movq w(%rip), %rax
movq %rax, dw(%rip)
ret
The issue with useless reload is PR 12395, as mentioned in Comment #5.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14552
