https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66930
--- Comment #6 from Kazumoto Kojima <kkojima at gcc dot gnu.org> --- Created attachment 36040 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36040&action=edit .i file for gengtype.c I've confirmed a miscompile for gengtype.c with -O1 on my 5/6 compilers. With them, if (union_p) { oprintf (d->of, "%*sbreak;\n", d->indent, ""); d->indent -= 2; } lines in gengtype.c:walk_type function are compiled like as: bf .L2253 mov.l .L2593,r7 mov.l @(36,r12),r6 mov.l .L2580,r5 mov.l .L2595,r1 jsr @r1 ... i.e. the instruction testing union_p variable is removed. The resulted gengtype produces files without "break" in many cases. Although it's the other way around with the reported full of "break" symptom, I think the both are the same issue. The deletion has happened in sh_split_movrt_negc_to_movt_xor which is called by movrt_negc insn_and_split. It seems that that splitting is applied for the case tst reg,reg mov #-1,reg1 negc reg1,reg1 ... call ... ... tst reg,reg and the last tst was removed. Oleg, could you take a look into this? BTW, I guess that > * Build with -O1 on sh4 (try to work around PR target/66358). will open a can of worms :-)
