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[Bug rtl-optimization/55686] [4.8 Regression] ICE in assign_by_spills, at lra-assigns.c:1244
- From: "jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 14 Dec 2012 11:26:15 +0000
- Subject: [Bug rtl-optimization/55686] [4.8 Regression] ICE in assign_by_spills, at lra-assigns.c:1244
- Auto-submitted: auto-generated
- References: <bug-55686-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55686
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-12-14 11:26:15 UTC ---
Even more reduced:
struct S { unsigned long *s, *t; };
unsigned long *q;
void
foo (struct S *x, unsigned long y, unsigned long z, int w)
{
unsigned long *d = x->t, j;
if (w)
for (j = 0; j < z; j++)
*d++ = q[-j];
register unsigned long *g __asm__ ("edi");
register struct S *h __asm__ ("esi");
h->s = g;
h->t--;
foo (h, h->t[-1], g[1], (int) g[2]);
goto *(void *) *g;
}
ICEd with reload too, starting with
http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185465
The reload ICE was
pr55686.c: In function âfooâ:
pr55686.c:17:1: error: unable to find a register to spill in class âDIREGâ
pr55686.c:17:1: error: this is the insn:
(insn 29 28 30 5 (parallel [
(set (mem:SI (reg/v/f:SI 1 dx [orig:66 d ] [66]) [4 MEM[base: d_9,
offset: 4294967292B]+0 S4 A32])
(reg:SI 0 ax [orig:67 D.1379 ] [67]))
(set (reg/v/f:SI 1 dx [orig:66 d ] [66])
(plus:SI (reg/v/f:SI 1 dx [orig:66 d ] [66])
(const_int 4 [0x4])))
]) pr55686.c:10 883 {*strsetsi_1}
(expr_list:REG_DEAD (reg:SI 0 ax [orig:67 D.1379 ] [67])
(nil)))
pr55686.c:17:1: internal compiler error: in spill_failure, at reload1.c:2120
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