$ mipsel-linux-gnu-gcc -v
Using built-in specs.
Target: mipsel-linux-gnu
Configured with:
/home/andre/toolchain/bs_build_4.3-20080111/gcc-4.3-20080111/configure
--prefix=/usr/local/mipsel_amd64/4.3-20080111-bare --target=mipsel-linux-gnu
--enable-languages=c --enable-checking=no --with-gnu-as --with-gnu-ld
--with-newlib --disable-libada --disable-libgomp --disable-libssp --disable-nls
--disable-multilib --disable-shared --disable-threads --with-tune=mips32r2
--with-gmp=/usr/local/mipsel_amd64/4.3-20080111-bare
--with-mpfr=/usr/local/mipsel_amd64/4.3-20080111-bare
Thread model: single
gcc version 4.3.0 20080111 (experimental) (GCC)
$ cat badmips16.c
void foo (unsigned long base, unsigned char *dst, unsigned int count)
{
while (count && ((unsigned long) dst) & 0x03) {
count--;
*dst++ = *((volatile unsigned char *) base);
}
while (count >= 4) {
count -= 4;
*dst = *((volatile unsigned int *) base);
dst += 4;
}
}
$ mipsel-linux-gnu-gcc -Os -mips16 -march=mips32r2 -mno-abicalls -c badmips16.c
$ mipsel-linux-gnu-objdump -d badmips16.o
badmips16.o: file format elf32-tradlittlemips
Disassembly of section .text:
00000000 <foo>:
0: 1004 b a <foo+0xa>
2: a440 lbu v0,0(a0)
4: 4eff addiu a2,-1
6: c540 sb v0,0(a1)
8: 4d01 addiu a1,1
a: 2608 beqz a2,1c <foo+0x1c>
c: 6a03 li v0,3
e: eaac and v0,a1
10: 2af8 bnez v0,2 <foo+0x2>
12: 1004 b 1c <foo+0x1c>
14: 9c40 lw v0,0(a0)
16: 4efc addiu a2,-4
18: c540 sb v0,0(a1)
1a: 4d04 addiu a1,4
1c: 5e04 sltiu a2,4
1e: 60fa bteqz 14 <foo+0x14>
20: e8a0 jrc ra
22: 6500 nop
...
...
Bug: The branch instruction at offset 0x12 is in the branch delay slot of the
bnez instruction at offset 0x10.
--
Summary: [4.3.0 20080111] mips16 : branch in branch delay slot
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: armcc2000 at yahoo dot com
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: mipsel-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34845
