http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55659
Bug #: 55659
Summary: [4.8 Regression] [SH] Build failure with ICE in
dwarf2out_var_location, at dwarf2out.c:20748
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: kkoj...@gcc.gnu.org
CC: ja...@gcc.gnu.org
Target: sh*-*-*
sh4-unknown-linux-gnu fails to build during compiling libgcc2.c with
trunk/libgcc/libgcc2.c: In function '__absvsi2':
trunk/libgcc/libgcc2.c:234:1: internal compiler error: in
dwarf2out_var_location, at dwarf2out.c:20748
}
^
0x82e4b56 dwarf2out_var_location
../../ORIG/trunk/gcc/dwarf2out.c:20744
0x83439bb final_scan_insn(rtx_def*, _IO_FILE*, int, int, int*)
../../ORIG/trunk/gcc/final.c:2215
It looks to start to fail after
r194392 | jakub | 2012-12-11 19:41:44 +0900 (Tue, 11 Dec 2012) | 10 lines
PR middle-end/43631
PR bootstrap/55615
* var-tracking.c (emit_note_insn_var_location): If insn is followed
by BARRIER, put note after the BARRIER.
(next_non_note_insn_var_location): Skip over BARRIERs.
(emit_notes_in_bb): If call is followed by BARRIER, put note after
the BARRIER.
A reduced testcase for -g -O2 is
void
foo (void)
{
bar ();
}
.236r.barriers dump looks like:
...
(call_insn/j 6 5 7 (parallel [
(set (reg:SI 0 r0)
(call (mem:SI (reg/f:SI 0 r0 [160]) [0 bar S4 A32])
(const_int 0 [0])))
(use (reg:PSI 151 ))
(return)
]) foo.c:4 325 {sibcall_valuei}
(expr_list:REG_DEAD (reg:PSI 151 )
(expr_list:REG_UNUSED (reg:SI 0 r0)
(nil)))
(nil))
(barrier 7 6 14)
(code_label 14 7 15 3 "" [0 uses])
(insn 15 14 16 (unspec_volatile [
(const_int 2 [0x2])
] UNSPECV_CMPXCHG_2) 408 {align_log}
(nil))
(code_label 16 15 17 2 "" [0 uses])
(insn 17 16 18 (unspec_volatile [
(symbol_ref:SI ("bar") [flags 0x41] <function_decl 0xb750c600
bar>)
(const_int 0 [0])
] 4) 404 {consttable_4}
(nil))
(insn 18 17 19 (unspec_volatile [
(const_int 0 [0])
] 11) 409 {consttable_end}
(nil))
(barrier 19 18 13)
(note 13 19 11 (expr_list:REG_DEP_TRUE (concat:SI (pc)
(symbol_ref:SI ("bar") [flags 0x41] <function_decl 0xb750c600 bar>))
(nil)) NOTE_INSN_CALL_ARG_LOCATION)
(note 11 13 0 NOTE_INSN_DELETED)
Before the latest var-tracking.c change, NOTE_INSN_CALL_ARG_LOCATION
note has been put just after barrier 7 instead of barrier 19. It seems
that the insns for constant pools for this target make the middle-end
confused.
