------- Comment #5 from roger at eyesopen dot com 2007-02-02 00:17 -------
It looks like Ian's recent subreg lowering pass patch has improved code
generation on this testcase. Previously, we'd spill three integer registers to
the stack for "LLM", we're now down to two. [A significant improvement from
the five we spilled when this bug was reported]
Before:
LLM: subl $12, %esp
movl %ebx, (%esp)
movl 28(%esp), %edx
movl 20(%esp), %ebx
movl 16(%esp), %ecx
movl 24(%esp), %eax
movl %esi, 4(%esp)
movl %edx, %esi
movl %edi, 8(%esp)
movl %ebx, %edi
movl (%esp), %ebx
imull %ecx, %esi
imull %eax, %edi
mull %ecx
addl %edi, %esi
movl 8(%esp), %edi
leal (%esi,%edx), %edx
movl 4(%esp), %esi
addl $12, %esp
ret
After:
LLM: subl $8, %esp
movl %ebx, (%esp)
movl 20(%esp), %eax
movl %esi, 4(%esp)
movl 24(%esp), %ecx
movl 12(%esp), %esi
movl 16(%esp), %ebx
imull %esi, %ecx
imull %eax, %ebx
mull %esi
movl 4(%esp), %esi
addl %ebx, %ecx
movl (%esp), %ebx
addl $8, %esp
leal (%ecx,%edx), %edx
ret
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17236
