https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #5 from Thomas Garnier ---
I didn't try the patch yet, that could be a good starting point (still need
change in switch optimization and segment registers). What is the consequence
of the change in default_binds_local_p_3? Is it suppo
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #7 from Thomas Garnier ---
Created attachment 43189
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43189&action=edit
testcase for mcmodel=large
Build with: gcc -mcmodel=large -c -fstatic-pie ./test.c -o test
Dump relocations on
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
Thomas Garnier changed:
What|Removed |Added
Attachment #43189|0 |1
is obsolete|
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #9 from Thomas Garnier ---
I tested the change against a modified version of the proposed Linux x86_64 PIE
support. The changes removes all the PLT32 and GOT64 entry but I still get
R_X86_64_GOTPC64 & R_X86_64_GOTOFF64 relocations on
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #11 from Thomas Garnier ---
I think for this file using only -mcmodel=large makes more sense.
Given the proposed option (-fstatic-pie) is not kernel specific, the TLS is not
needed. What do you think about disabling optimization like
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #13 from Thomas Garnier ---
Created attachment 43223
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43223&action=edit
testcase for switch folding
No switch folding if built with:
$CC -O2 -fno-PIE -c -o switch ./switch.c
Swit
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #14 from Thomas Garnier ---
Correcting what I said before, it is about re-enabling switch folding (or
switch optimization).
Basically without PIE (-fno-PIE) with -O2, a switch can be optimized to be:
:
0: b8 00
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #16 from Thomas Garnier ---
Yes, I think you can't just default to the non-PIE mode.
Clang does it well though:
:
0: 83 ff 16cmp$0x16,%edi
3: 77 0f ja 14
5:
Assignee: unassigned at gcc dot gnu.org
Reporter: thgarnie at google dot com
Target Milestone: ---
Created attachment 43225
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43225&action=edit
Switch test case
With -O2 and -fPIE switch tables are never optimized as well as the
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
--- Comment #18 from Thomas Garnier ---
Ok. Opened: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84011
rmal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: thgarnie at google dot com
Target Milestone: ---
The current PIE/PIC code generation is not optimal for kernel code.
It makes inferences about the execution environment which do
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