------- Comment #31 from hjl dot tools at gmail dot com 2009-01-20 21:17
-------
Created an attachment (id=17154)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=17154&action=view)
A testcase
Revision 143498 gave:
[...@gnu-34 ppc]$ /export/gnu/import/rrs/143498/usr/bin/gcc -S bar.c -O2; egrep
"32\(%rsp\)" bar.s
movq %rdi, 32(%rsp)
movq 32(%rsp), %rdi
movq 32(%rsp), %rdi
movq %rdx, 32(%rsp)
movq 32(%rsp), %rcx
movq %r14, 32(%rsp)
movq 32(%rsp), %rax
movq 32(%rsp), %rsi
movq 32(%rsp), %rsi
movq 32(%rsp), %rdi
[...@gnu-34 ppc]$
The stack slot 32(%rsp) is used to save RDI. But it is also
use for something else.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38587
