[Bug c/22537] New: unable to find a register to spill in cl

[mueller at kde dot org]

ass ‘CREG’
X-Bugzilla-Reason: CC

compiling testcase:  
 
=== Cut === 
struct nand_chip { 
·       int ·   ·       page_shift; 
·       int·    ·       phys_erase_shift; 
}; 
 
extern void foo( int ); 
 
static void nand_writev_ecc (int *mtd, int *vecs, unsigned long count) 
{ 
·       int i, total_len; 
·       struct nand_chip *this;  
·       int·    ppblock = (1 << (this->phys_erase_shift - this->page_shift)); 
 
·       total_len = count; 
·       for (i = 0; i < count; i++) 
·       ·       total_len+=ppblock; 
 
        foo (ppblock); 
} 
=== Cut === 
 
with 
 
gcc -Os -march=k6 -mregparm=3 -fno-unit-at-a-time -c 
drivers/mtd/nand/nand_base.c 
 
gives: 
 
drivers/mtd/nand/nand_base.c:19: error: unable to find a register to spill in 
class &#8216;CREG&#8217; 
drivers/mtd/nand/nand_base.c:19: error: this is the insn: 
(insn:HI 19 18 46 0 (parallel [ 
            (set (reg/v:SI 3 bx [orig:59 ppblock ] [59]) 
                (ashift:SI (reg/v:SI 3 bx [orig:59 ppblock ] [59]) 
                    (subreg:QI (reg:SI 0 ax [orig:65 
<variable>.phys_erase_shift ] [65]) 0))) 
            (clobber (reg:CC 17 flags)) 
        ]) 280 {*ashlsi3_1} (insn_list:REG_DEP_TRUE 17 (insn_list:REG_DEP_TRUE 
18 (nil))) 
    (expr_list:REG_UNUSED (reg:CC 17 flags) 
        (expr_list:REG_DEAD (reg:SI 0 ax [orig:65 <variable>.phys_erase_shift ] 
[65]) 
            (expr_list:REG_UNUSED (reg:CC 17 flags) 
                (expr_list:REG_EQUAL (ashift:SI (const_int 1 [0x1]) 
                        (subreg:QI (reg:SI 67) 0)) 
                    (nil)))))) 
drivers/mtd/nand/nand_base.c:19: internal compiler error: in spill_failure, at 
reload1.c:1878 
 
gcc version 4.0.1 20050701 (prerelease)

-- 
           Summary: unable to find a register to spill in cl
                    ass &#8216;CREG&#8217;
           Product: gcc
           Version: 4.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mueller at kde dot org
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: i586-suse-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22537