https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77311
Bug ID: 77311
Summary: bfin: error: unable to find a register to spill in
class 'CCREGS'
Product: gcc
Version: 6.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: wbx at openadk dot org
Target Milestone: ---
Created attachment 39480
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39480&action=edit
ffmpeg preprocessed file
When compiling either ffmpeg or binutils for bfin with gcc 6.1.0 you get
something like
that:
CC libavcodec/huffyuvencdsp.o
In file included from libavcodec/hevcdsp.c:111:0:
libavcodec/hevcdsp_template.c: In function 'hevc_v_loop_filter_luma_8':
libavcodec/hevcdsp_template.c:1678:1: error: unable to find a register to spill
in class 'CCREGS'
}
^
libavcodec/hevcdsp_template.c:1678:1: error: this is the insn:
(insn 488 474 719 20 (set (reg:BI 15 FP [549])
(eq:BI (reg/v:SI 15 FP [orig:98 no_p ] [98])
(const_int 0 [0]))) libavcodec/hevcdsp_template.c:1596 118
{compare_eq}
(expr_list:REG_DEAD (reg/v:SI 15 FP [orig:98 no_p ] [98])
(nil)))
libavcodec/hevcdsp_template.c:1678: confused by earlier errors, bailing out
common.mak:57: recipe for target 'libavcodec/hevcdsp.o' failed
make[1]: *** [libavcodec/hevcdsp.o] Error 1
make[1]: *** Waiting for unfinished jobs....
It seems as some kind of gcc optimization bug with Os/O2/O3, as the problematic
code can be compiled with O1 without any problem.
Problem found via Buildroot autobuilders:
http://autobuild.buildroot.net/results/111/1118d568959006b7f973761884fd3f4b63be19b1/
Preprocessed file attached.
