Using -Os with gcc4.4 vs gcc4.3 we see a ~15% increase in code size. This is
due to the fact that load/store multiple instructions are not being used for
function prologue/epilogues. The other option would be to use out of line
save/restore calls in the prologue/epilogues (which are also not being used).
We are no longer able to build the u-boot open source loader because the code
size increase expands beyond the allowable size (to meet flash constraints).
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Summary: -Os generates significantly larger code
Product: gcc
Version: 4.4.1
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: galak at kernel dot crashing dot org
GCC build triplet: ppc64-redhat-linux
GCC host triplet: ppc64-redhat-linux
GCC target triplet: ppc64-redhat-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41175
