https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93583
--- Comment #8 from rguenther at suse dot de <rguenther at suse dot de> --- On Mon, 17 Feb 2020, marxin at gcc dot gnu.org wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93583 > > --- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> --- > (In reply to Segher Boessenkool from comment #4) > > The line where things crash is > > rtx temp = gen_reg_rtx (GET_MODE (valreg)); > > but presumably valreg is just 0 here? > > Yes: > > (gdb) p valreg > $1 = (rtx_def *) 0x0 > > (gdb) p debug_gimple_stmt(stmt) > # .MEM_49 = VDEF <_45> > describe_cache.constprop.isra (l1_sizekb_36, l1_line_37); So from the context of the crash kind-of an obvious fix would be diff --git a/gcc/calls.c b/gcc/calls.c index d1c53171176..b5ccfaced37 100644 --- a/gcc/calls.c +++ b/gcc/calls.c @@ -4667,7 +4667,7 @@ expand_call (tree exp, rtx target, int ignore) valreg = gen_rtx_REG (TYPE_MODE (rettype), REGNO (valreg)); } - if (pass && (flags & ECF_MALLOC)) + if (pass && (flags & ECF_MALLOC) && valreg) { rtx temp = gen_reg_rtx (GET_MODE (valreg)); rtx_insn *last, *insns; since there is no use of the return value so any fumbling with it for ECF_MALLOC is pointless. Correspoinding code handling ERF_RETURNS_ARG checks for a NULL valreg already. > One can debug that on gcc112 compile farm machine: > > $ /home/marxin/Programming/gcc/objdir/./prev-gcc/lto1 /tmp/ice.ltrans1.o > -fltrans -quiet > during RTL pass: expand > ../../gcc/config/rs6000/driver-rs6000.c: In function ‘host_detect_local_cpu’: > ../../gcc/config/rs6000/driver-rs6000.c:338:25: internal compiler error: > Segmentation fault > 338 | return describe_cache (l1_sizekb, l1_line, l1_assoc, l2_sizekb); > | ^ > 0x109138f3 crash_signal > ../../gcc/toplev.c:328 > 0x102468b0 expand_call(tree_node*, rtx_def*, int) > ../../gcc/calls.c:4672 > 0x1040d527 expand_expr_real_1(tree_node*, rtx_def*, machine_mode, > expand_modifier, rtx_def**, bool) > ../../gcc/expr.c:11130 > 0x10260097 expand_expr > ../../gcc/expr.h:282 > 0x10260097 expand_call_stmt > ../../gcc/cfgexpand.c:2703 > 0x10260097 expand_gimple_stmt_1 > ../../gcc/cfgexpand.c:3682 > 0x10260097 expand_gimple_stmt > ../../gcc/cfgexpand.c:3847 > 0x102673d3 expand_gimple_basic_block > ../../gcc/cfgexpand.c:5887 > 0x10269f07 execute > ../../gcc/cfgexpand.c:6542 > Please submit a full bug report, > with preprocessed source if appropriate. > Please include the complete backtrace with any bug report. > See <https://gcc.gnu.org/bugs/> for instructions. > >
