https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90075
Bug ID: 90075
Summary: [AArch64] ICE during RTL pass when member of union
passed to copysignf
Product: gcc
Version: 8.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: jjhelmus at gmail dot com
Target Milestone: ---
Created attachment 46156
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46156&action=edit
preprocessed source of code mentioned in report
GCC 8.3.0 as well as other releases in the 8.x and 7.x line fail with an
internal compiler error when compiling the following example with -fPIC and
optimization enabled.
#include <math.h>
typedef struct { float one, two; } twofloats;
float
bug(twofloats tf)
{
float f1, f2;
union {
twofloats tfloats;
float arr[2];
} utfloats;
utfloats.tfloats = tf;
f1 = utfloats.arr[1];
f2 = copysignf(0, f1);
return f2;
}
Using the gcc 8.3.0 docker image on a AArch64 system (RockChip rk3399) running
Ubunutu 18.04 produces the following results:
root@37bc4cc2fc49:/io# gcc --version
gcc (GCC) 8.3.0
Copyright (C) 2018 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.
root@37bc4cc2fc49:/io# gcc -Wall -Wextra -O1 -fPIC -c mre.c
during RTL pass: expand
mre.c: In function 'bug':
mre.c:15:10: internal compiler error: Segmentation fault
f2 = copysignf(0, f1);
^~~~~~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
Removing the -O1 or -fPIC arguments allow for successful compilation.
The preprocessed source is attached.
This issue was initially detected while attempting to build NumPy 1.16.3, a
popular Python library for Numerical computation, for AArch64,
https://github.com/conda-forge/numpy-feedstock/pull/138.
