https://gcc.gnu.org/bugzilla/show_bug.cgi?id=45729
Andre Goddard Rosa <andre.rosa at lge dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |andre.rosa at lge dot com
--- Comment #3 from Andre Goddard Rosa <andre.rosa at lge dot com> ---
Is LTO playing well with thumb as far as 4.8.3 is concerned or still not
supported?
Got the following when mixing "-mthumb" with "-flto=8 -fuse-linker-plugin":
| /tmp/ccQ4Z3ej.s: Assembler messages:
| /tmp/ccQ4Z3ej.s:21: Error: lo register required -- `str lr,[sp,#4]'
| /tmp/ccQ4Z3ej.s:31: Error: lo register required -- `str lr,[sp,#4]'
...
| /tmp/ccQ4Z3ej.s:1134: Error: lo register required -- `ldr lr,[sp,#0x38]'
| /tmp/ccQ4Z3ej.s:1158: Error: instruction not supported in Thumb16 mode --
`adds r3,#5'
| /tmp/ccQ4Z3ej.s:1173: Error: lo register required -- `ldr r10,[r1,#60]'
| /tmp/ccQ4Z3ej.s:1174: Error: lo register required -- `ldr r3,[r10,#0]'
| /tmp/ccQ4Z3ej.s:1186: Error: instruction not supported in Thumb16 mode --
`adds r3,#5'
| /tmp/ccQ4Z3ej.s:1201: Error: lo register required -- `ldr r10,[r1,#60]'
| /tmp/ccQ4Z3ej.s:1202: Error: lo register required -- `ldr r3,[r10,#0]'
| /tmp/ccQ4Z3ej.s:1216: Error: instruction not supported in Thumb16 mode --
`adds r3,#5'
| /tmp/ccQ4Z3ej.s:1234: Error: lo register required -- `ldr r10,[r1,#60]'
| /tmp/ccQ4Z3ej.s:1241: Error: dest must overlap one source register -- `mul
r2,r3,r0'
| /tmp/ccQ4Z3ej.s:1242: Error: instruction not supported in Thumb16 mode --
`lsls r0,r0,#3'
| /tmp/ccQ4Z3ej.s:1245: Error: unshifted register required -- `add
r3,r5,r0,lsl#0'
| /tmp/ccQ4Z3ej.s:1247: Error: instruction not supported in Thumb16 mode --
`subs r4,r4,#32'
| /tmp/ccQ4Z3ej.s:1249: Error: unshifted register required -- `add
r3,r5,r0,lsl#0'
| /tmp/ccQ4Z3ej.s:1252: Error: unshifted register required -- `mvn r3,#7'
| /tmp/ccQ4Z3ej.s:1253: Error: instruction not supported in Thumb16 mode --
`adds r0,r3'
| /tmp/ccQ4Z3ej.s:1261: Error: instruction not supported in Thumb16 mode --
`lsls r0,r0,#3'
| /tmp/ccQ4Z3ej.s:1262: Error: instruction not supported in Thumb16 mode --
`subs r0,r5,r0'
Removing LTO or -mthumb makes the problem go away.
$ ld --version
GNU ld (crosstool-NG 1.19.0 - 4.8-2014.10-x86_64) 2.24.0.20140311 Linaro
2014.03
Copyright 2013 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.
$ gcc --version
gcc-original (crosstool-NG 1.19.0 - 4.8-2014.10-x86_64) 4.8.3 20140401
(prerelease)
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
