https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82333
Bug ID: 82333
Summary: [8 Regression] powerpc64le _Float128 ICE in as_a, at
machmode.h:345
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: jsm28 at gcc dot gnu.org
Target Milestone: ---
Target: powerpc64le-linux-gnu
The following code, compiled with -O2 for powerpc64le-linux-gnu, produces the
following ICE. This is a regression from GCC 7 (note you need -mfloat128 to
build with older compilers), reduced from glibc test-tgmath3, and probably
postdates the change to enable _Float128 support by default for powerpc64le
(since the glibc test built before then, then glibc build for powerpc64le was
broken for a while, and by the time it was fixed this ICE appeared). Note, you
need both the _Complex long double functions and the apparently independent
_Complex _Float128 functions for this ICE to appear.
_Complex long double vld;
_Complex _Float128 vf128;
_Complex long double
fld (_Complex long double arg0)
{
return 0;
}
_Complex _Float128
ff128 (_Complex _Float128 arg0)
{
return 0;
}
void
tld (void)
{
vld = fld (vld);
}
void
tf128 (void)
{
vf128 = ff128 (vf128);
}
during RTL pass: expand
test-tgmath3.i: In function 'tf128':
test-tgmath3.i:25:9: internal compiler error: in as_a, at machmode.h:345
vf128 = ff128 (vf128);
~~~~~~^~~~~~~~~~~~~~~
0x839dec scalar_mode as_a<scalar_mode>(machine_mode)
/scratch/jmyers/glibc/many8/src/gcc/gcc/machmode.h:345
0x839dec convert_mode_scalar
/scratch/jmyers/glibc/many8/src/gcc/gcc/expr.c:281
0x839dec convert_move(rtx_def*, rtx_def*, int)
/scratch/jmyers/glibc/many8/src/gcc/gcc/expr.c:271
0x84091e store_expr_with_bounds(tree_node*, rtx_def*, int, bool, bool,
tree_node*)
/scratch/jmyers/glibc/many8/src/gcc/gcc/expr.c:5628
0x8424f0 expand_assignment(tree_node*, tree_node*, bool)
/scratch/jmyers/glibc/many8/src/gcc/gcc/expr.c:5319
0x71ff95 expand_gimple_stmt_1
/scratch/jmyers/glibc/many8/src/gcc/gcc/cfgexpand.c:3655
0x71ff95 expand_gimple_stmt
/scratch/jmyers/glibc/many8/src/gcc/gcc/cfgexpand.c:3751
0x722796 expand_gimple_basic_block
/scratch/jmyers/glibc/many8/src/gcc/gcc/cfgexpand.c:5750
0x7281a6 execute
/scratch/jmyers/glibc/many8/src/gcc/gcc/cfgexpand.c:6357
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
