Hi, It looks like the tests for -frtl-abstract-sequences are either skipped or xfailed for a long list of platforms:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33642 "unrecognizable insn for -frtl-abstract-sequences" << Almost any source file compiled for any of a large number of targets (powerpc*-*, arm-eabi, hppa-linux, mipsel-linux, s390*-linux, sh*-*, sparc*-*) with -O2 -frtl-abstract-sequences results in the following: bug1.c: In function ‘foo’: bug1.c:8: error: unrecognizable insn: (insn 28bug1.c:8: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. The testcase used here: int foo (void) { return 0; } >> gcc/testsuite/gcc.c-torture/compile/pr11832.c /* { dg-do compile } */ /* Currently ICEs for Alpha, IA64, HPPA, MIPS, CRIS, Xtensa, PowerPC, SH and SPARC; see PR33642. */ /* { dg-xfail-if "PR33642" { alpha*-*-* hppa*-*-* mips*-*-* powerpc*-*-* cris-*-* crisv32-*-* ia64-*-* xtensa*-*-* sh*-*-* sparc*-*-* s390*-*-* } { "*" } { "" } } */ /* Currently ICEs for (x86 && ilp32 && pic). */ /* { dg-xfail-if "PR33642/36240" { { i?86-*-* x86_64-*-* } && { ilp32 && { ! nonpic } } } { "*" } { "" } } */ I was about to add arm*-*-* but there are other reports about this flag (not exhaustive, just based on summary): http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30121 "ICE on frtl-abstract-sequences" http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31549 "Documentation for -frtl-abstract-sequences is in the wrong place" http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36240 "PIC and -frtl-abstract-sequences" http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38694 "gcc.c-torture/compile/pr11832.c and pr33009.c -frtl-abstract-sequences ICE on arm-linux-gnueabi on 4.3.2 and trunk" What should be done about this optimization for 4.4 and 4.5? Is there anyone trying to fix its shortcomings? Thanks in advance, Laurent
