https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98177
Bug ID: 98177
Summary: [11 Regression] SVE: ICE in expand_direct_optab_fn, at
internal-fn.c:3368
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: acoplan at gcc dot gnu.org
Target Milestone: ---
For the following C++ testcase:
int a, b;
short c;
void d(long e) {
for (int f = 0; f < b; f += 1)
for (short g = 0; g < c; g += 5)
a = (short)e;
}
we ICE with -Ofast -march=armv8.2-a+sve -msve-vector-bits=128 since
r11-4912-g46c705e70e078f6a1920d92e49042125d5e18495.
To reproduce:
$ aarch64-elf-gcc -c -S -Ofast -march=armv8.2-a+sve -msve-vector-bits=128
test.cc
during RTL pass: expand
test.cc: In function 'void d(long int)':
test.cc:3:6: internal compiler error: in expand_direct_optab_fn, at
internal-fn.c:3368
3 | void d(long e) {
| ^
0xd63e0f expand_direct_optab_fn
/home/alecop01/toolchain/src/gcc/gcc/internal-fn.c:3368
0xd64978 expand_REDUC_MAX
/home/alecop01/toolchain/src/gcc/gcc/internal-fn.def:209
0xd6631e expand_internal_call(internal_fn, gcall*)
/home/alecop01/toolchain/src/gcc/gcc/internal-fn.c:4089
0xd66338 expand_internal_call(gcall*)
/home/alecop01/toolchain/src/gcc/gcc/internal-fn.c:4097
0xae74ad expand_call_stmt
/home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:2740
0xae74ad expand_gimple_stmt_1
/home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:3835
0xae74ad expand_gimple_stmt
/home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:3999
0xaf1827 expand_gimple_basic_block
/home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:6043
0xaf2ede execute
/home/alecop01/toolchain/src/gcc/gcc/cfgexpand.c:6727
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.
Curiously, I can only reproduce the ICE when the testcase is treated as C++. It
seems we fail to vectorize the testcase if we instead treat it as C.
