http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56791
Bug #: 56791
Summary: Segmentation fault in stage2 gengenrtl -- Incorrect
instruction sequence generated by reload
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: dang...@gcc.gnu.org
Host: hppa1.1-hp-hp10.20
Target: hppa1.1-hp-hp10.20
Build: hppa1.1-hp-hp10.20
Created attachment 29757
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29757
Preprocessed source
/xxx/gnu/gcc/objdir/./prev-gcc/xg++ -B/xxx/gnu/gcc/objdir/./prev-gcc/
-B/opt/gnu/gcc/gcc-4.8/hppa1.1-hp-hpux10.20/bin/ -nostdinc++
-B/xxx/gnu/gcc/objdir/prev-hppa1.1-hp-hpux10.20/libstdc++-v3/src/.libs
-B/xxx/gnu/gcc/objdir/prev-hppa1.1-hp-hpux10.20/libstdc++-v3/libsupc++/.libs
-I/xxx/gnu/gcc/objdir/prev-hppa1.1-hp-hpux10.20/libstdc++-v3/include/hppa1.1-hp-hpux10.20
-I/xxx/gnu/gcc/objdir/prev-hppa1.1-hp-hpux10.20/libstdc++-v3/include
-I/xxx/gnu/gcc/gcc/libstdc++-v3/libsupc++
-L/xxx/gnu/gcc/objdir/prev-hppa1.1-hp-hpux10.20/libstdc++-v3/src/.libs
-L/xxx/gnu/gcc/objdir/prev-hppa1.1-hp-hpux10.20/libstdc++-v3/libsupc++/.libs
-g -O2 -DIN_GCC -fno-exceptions -fno-rtti -fasynchronous-unwind-tables -W
-Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wmissing-format-attribute
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings
-DHAVE_CONFIG_H -DGENERATO
R_FILE -static-libstdc++ -static-libgcc -o build/gengenrtl \
build/gengenrtl.o build/errors.o .././libiberty/libiberty.a
build/gengenrtl > tmp-genrtl.h
/bin/sh: 9799 Memory fault(coredump)
make[3]: *** [s-genrtl-h] Error 139
In the generated assembly code, the fault occurs in the ldw instruction
using register %r19.
.CALL ARGW0=GR
bl puts,%r2
ldo RR'L$C0034(%r26),%r26
L$BE0063:
L$BE0067:
.stabn 68,0,270,L$M0084-L$FBB0002
L$M0084:
ldw 0(%r19),%r20
ldws,ma 4(%r20),%r4
%r19 is clobbered by the preceding call to puts. The problem occurs
in reload. Prior to reload, we have the following for insn 448:
(insn 448 447 450 57 (set (reg/v/f:SI 242 [ format ])
(mem/f:SI (post_inc:SI (reg/f:SI 243 [ ivtmp.101 ])) [3 MEM[base: _104,
offset: 0B]+0 S4 A32])) ../../gcc/gcc/gengenrtl.c:270 40 {*pa.md:2211}
(expr_list:REG_INC (reg/f:SI 243 [ ivtmp.101 ])
(nil)))
After reload, we have:
(call_insn 447 446 1092 57 (parallel [ (set (reg:SI 28 %r28)
(call (mem:SI (symbol_ref/v:SI ("@puts") [flags 0x41]
<function
_decl 7ae76100 __builtin_puts>) [0 __builtin_puts S4 A32])
(const_int 16 [0x10])))
(clobber (reg:SI 1 %r1))
(clobber (reg:SI 2 %r2))
(use (const_int 0 [0]))
]) ../../gcc/gcc/gengenrtl.c:247 203 {call_val_symref}
(nil)
(expr_list:REG_CC_SETTER (use (reg:SI 26 %r26))
(nil)))
(insn 1092 447 1091 57 (set (reg:SI 20 %r20)
(mem/c:SI (reg:SI 19 %r19) [7 %sfp+8 S4 A32]))
../../gcc/gcc/gengenrtl.c
:270 40 {*pa.md:2211}
(nil))
(insn 1091 1092 448 57 (set (reg:SI 19 %r19)
(plus:SI (reg/f:SI 30 %r30)
(const_int -120 [0xffffff88]))) ../../gcc/gcc/gengenrtl.c:270 112
{a
ddsi3}
(nil))
(insn 448 1091 1093 57 (set (reg/v/f:SI 4 %r4 [orig:242 format ] [242])
(mem/f:SI (post_inc:SI (reg:SI 20 %r20)) [3 MEM[base: _104, offset:
0B]+0 S4 A32])) ../../gcc/gcc/gengenrtl.c:270 40 {*pa.md:2211}
(expr_list:REG_INC (reg:SI 20 %r20)
(nil)))
Insns 1091 and 1092 are interchanged.
I'm not sure but there appears to be special handling for increment
instructions here:
if (old != 0
/* AUTO_INC reloads need to be handled even if inherited. We got an
AUTO_INC reload if reload_out is set but reload_out_reg isn't. */
&& (! reload_inherited[j] || (rl->out && ! rl->out_reg))
&& ! rtx_equal_p (reg_rtx, old)
&& reg_rtx != 0)
emit_input_reload_insns (chain, rld + j, old, j);
emit_input_reload_insns is called from the above after insn 1091 is emitted.
Can reproduce on i686-apple-darwin9.
Probably, this affects other hppa targets.
Compilation command:
-fpreprocessed gengenrtl.ii -quiet -dumpbase gengenrtl.c -mschedule=7100LC
-auxbase-strip build/gengenrtl.o -g -O2 -Wextra -Wall -Wno-narrowing
-Wwrite-strings -Wcast-qual -Wsuggest-attribute=format -Wpedantic
-Wno-long-long -Wno-variadic-macros -Wno-overlength-strings -version
-fno-exceptions -fno-rtti -fasynchronous-unwind-tables -o gengenrtl.s
