[Bug target/19051] New: m6811-elf-gcc ICE

["gcc-bugzilla at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

gcc ICE when I did:
===================
$ m6811-elf-g++ -Os -mshort -msoft-reg-count=32 -m68hc12 -c n.cpp

The ICE message is:
===================
n.cpp: In function 'void getNewTableEntry()':
n.cpp:49: error: unable to find a register to spill in class 'D_REGS'
n.cpp:49: error: this is the insn:
(insn:HI 60 59 62 9 (set (reg:HI 59 [ D.1552 ])
        (mult:HI (sign_extend:HI (reg:QI 63))
            (sign_extend:HI (reg/v:QI 14 *_.d1 [orig:55 newIdx ] [55])))) 70 {mulqihi3} (insn_list:REG_DEP_TRUE 59 (nil))
    (expr_list:REG_DEAD (reg/v:QI 14 *_.d1 [orig:55 newIdx ] [55])
        (expr_list:REG_DEAD (reg:QI 63)
            (expr_list:REG_EQUAL (mult:HI (sign_extend:HI (reg/v:QI 14 *_.d1 [orig:55 newIdx ] [55]))
                    (const_int 6 [0x6]))
                (nil)))))
n.cpp:49: internal compiler error: in spill_failure, at reload1.c:1873
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.


The m6811-elf-g++ 3.4.4 also generates same ICE.
$ ./m6811-elf-g++ --version
m6811-elf-g++ (GCC) 3.4.4 20041108 (prerelease)

Environment:
System: Linux namsh 2.6.10-rc3n2 #6 Tue Dec 14 15:50:33 KST 2004 i686 athlon i386 GNU/Linux
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: m6811-unknown-none
configured with: ../configure --target=m6811-elf --prefix=/usr/GNUHCS --program-prefix=m6811-elf- --with-gnu-ld --with-gnu-as --disable-shared --enable-languages=c,c++ --without-headers --with-newlib --disable-nls --disable-threads

How-To-Repeat:
Compile the code below with compiler option I described:

// n.cpp
extern signed char g_oldVal, g_newVal;
extern signed char g_base;
extern unsigned char tableA[], tableB[];
extern unsigned char g_AAval, g_APval;
extern unsigned char g_BAval, g_BPval;
extern unsigned int g_ARval, g_ABval;
extern unsigned int g_BRval, g_BBval;

typedef struct {
    unsigned int r;
    unsigned int b;
    unsigned char a;
    unsigned char p;
} TABLEENTRY;

void getNewTableEntry()
{
    signed char oldIdx = g_oldVal, newIdx = g_newVal;
    const signed char maxVal = ((44 * 2) + 6 * 2);

    oldIdx += g_base;
    newIdx += g_base;

    if (oldIdx < 0)
	oldIdx = 0;
    else if (oldIdx > maxVal)
	oldIdx = maxVal;
    if (newIdx < 0)
	newIdx = 0;
    else if (newIdx > maxVal)
	newIdx = maxVal;

    if (oldIdx != newIdx)
    {
	TABLEENTRY *tablePtr;

	tablePtr = (TABLEENTRY *) tableA + newIdx;
	g_ARval = tablePtr->r;
	g_ABval = tablePtr->b;
	g_AAval = tablePtr->a;
	g_APval = tablePtr->p;

	tablePtr = (TABLEENTRY *) tableB + newIdx;
	g_BRval = tablePtr->r;
	g_BBval = tablePtr->b;
	g_BAval = tablePtr->a;
	g_BPval = tablePtr->p;
    }
}
------- Additional Comments From namsh at kldp dot org  2004-12-17 08:34 -------
Fix:
The work-around is:
1. Remove one of the compiler options: -Os or -msoft-reg-count=32
2. Use 'int' instead of 'signed char' for oldIdx/newIdx.

-- 
           Summary: m6811-elf-gcc ICE
           Product: gcc
           Version: 0.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: namsh at kldp dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: m6811-unknown-none


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19051