https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126556
Bug ID: 126556
Summary: [15/16/17 Regression] ICE at -O2 on aarch64 during RTL
pass: combine
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: xxs_chy at outlook dot com
Target Milestone: ---
Reproducer: https://godbolt.org/z/McTjq89Ed
Testcase:
#include <stdint.h>
#define BITCAST(DST_TYPE, SRC_TYPE, VALUE)
\
(union {
\
SRC_TYPE src;
\
DST_TYPE dst
\
}){ VALUE }
\
.dst
typedef uint8_t v4u8 __attribute__((vector_size(4)));
typedef uint8_t fp_t_7(_Bool, uint16_t, uint32_t, void *);
void *f9_a3;
_Bool f9_c4()
{
uint8_t v6;
uint32_t bb8;
v4u8 bc11;
fp_t_7 fp13;
bc11 = BITCAST(v4u8, uint32_t, bb8);
v6 = bc11[3];
bc11[(int8_t)v6 > 0] = v6;
f9_a3 = &bc11;
fp13(f9_c4, 1098, 8038, f9_a3);
}
Dump at -O2:
during RTL pass: combine
/tmp/tmpbs9ho86k/case.c: In function 'f9':
/tmp/tmpbs9ho86k/case.c:4552:1: internal compiler error: in do_SUBST, at
combine.cc:717
4552 | }
| ^
0x274420d internal_error(char const*, ...)
/data/Projects/compiler-test-env/cte-work/src/gcc/gcc/diagnostic-global-context.cc:787
0xb137eb fancy_abort(char const*, int, char const*)
/data/Projects/compiler-test-env/cte-work/src/gcc/gcc/diagnostics/context.cc:1813
0xac5b61 do_SUBST
/data/Projects/compiler-test-env/cte-work/src/gcc/gcc/combine.cc:717
0x23c298c simplify_set
/data/Projects/compiler-test-env/cte-work/src/gcc/gcc/combine.cc:6919
0x23c5892 subst
/data/Projects/compiler-test-env/cte-work/src/gcc/gcc/combine.cc:5665
0x23c988f try_combine
/data/Projects/compiler-test-env/cte-work/src/gcc/gcc/combine.cc:3323
0x23cf353 combine_instructions
/data/Projects/compiler-test-env/cte-work/src/gcc/gcc/combine.cc:1273
0x23cf353 rest_of_handle_combine
/data/Projects/compiler-test-env/cte-work/src/gcc/gcc/combine.cc:15227
0x23cf353 execute
/data/Projects/compiler-test-env/cte-work/src/gcc/gcc/combine.cc:15271
