https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91623
Bug ID: 91623 Summary: [7/8/9 Regression] -msse4.1 -O3 segfault in /usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/smmintr in.h:270:10 Product: gcc Version: 9.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: soap at gentoo dot org Target Milestone: --- Created attachment 46793 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46793&action=edit Minimum test case Under certain conditions, GCC raises an ICE. I have used creduce to produce a minimal example: typedef long long a __attribute__((__vector_size__(16))); typedef long long b __attribute__((__vector_size__(16))); b c, e, g, h; d; const i; j(k, l) { if (d && 0 <= k - 1 && l) m(); } p() { int f = 0; c = (a){1}; b n = c; g = (a){}; b o = g; for (; f < i; ++f) { b a = o == n; h = a; j(f, i); o = e; } } gcc-6.5.0 -msse4.1 -O3 -c test.c: PASS gcc-6.5.0 -msse4.1 -O2 -c test.c: PASS gcc-7.4.0 -msse4.1 -O3 -c test.c: FAIL gcc-7.4.0 -msse4.1 -O2 -c test.c: PASS gcc-8.3.0 -msse4.1 -O3 -c test.c: FAIL gcc-8.3.0 -msse4.1 -O2 -c test.c: PASS gcc-9.2.0 -msse4.1 -O3 -c test.c: FAIL gcc-9.2.0 -msse4.1 -O2 -c test.c: PASS In all failure cases I get the error during RTL pass: expand test.c: In function āpā: test.c:10:1: internal compiler error: Segmentation fault