https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82102
Bug ID: 82102 Summary: [8 Regression] ICE: Segmentation fault in /home/arnd/git/gcc/gcc/tree-ssa-pre.c:4863 Product: gcc Version: 8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: arnd at linaro dot org Target Milestone: --- I ran into a segmentation fault on today's snapshot (now at r251683): $ x86_64-linux-gcc-8.0.0 -c pt3_i2c.c -Wall -O2 during GIMPLE pass: pre pt3_i2c.c: In function 'pt3_i2c_master_xfer': pt3_i2c.c:12:6: internal compiler error: Segmentation fault void pt3_i2c_master_xfer(int p1) { ^~~~~~~~~~~~~~~~~~~ 0xaa657f crash_signal /home/arnd/git/gcc/gcc/toplev.c:341 0xbeeb7a fini_eliminate /home/arnd/git/gcc/gcc/tree-ssa-pre.c:4863 0xbf8a4d execute /home/arnd/git/gcc/gcc/tree-ssa-pre.c:5201 Please submit a full bug report... I can reproduce this with x86_64-linux-gcc (both 32 and 64 bit) and aarch64-linux-gcc, but not arm-linux-gnueabi-gcc using the same gcc source. See below for a reduced test case. 8<------- void *a, *b; struct pt3_i2cbuf { int num_cmds; } c; void *memcpy(void *, void *, long); void put_stop(); void translate(struct pt3_i2cbuf *p1, int p2) { p1->num_cmds = 0; if (p2) put_stop(); } void pt3_i2c_master_xfer(int p1) { translate(&c, p1); memcpy(a, b, c.num_cmds); for (; p1;) ; }