FTBFS on amd64, i386 for test-rebuild-20111222 (gcc-4.7)

bluez fails to built in the latest test rebuild (test-rebuild-20111222), with gcc-4.7:

# source='sbc/sbc_primitives_mmx.c' object='sbc/sbc_libsbc_la-sbc_primitives_mmx.lo' libtool=yes
/bin/bash ./libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I./lib -I./src -I./src -I./audio -I./sbc -I./gdbus -I./attrib -I./btio -I./health -D_FORTIFY_SOURCE=2 -finline-functions -fgcse-after-reload -funswitch-loops -funroll-loops -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -Wall -D_FORTIFY_SOURCE=2 -fPIC -g -c -o sbc/sbc_libsbc_la-sbc_primitives_mmx.lo `test -f 'sbc/sbc_primitives_mmx.c' || echo './'`sbc/sbc_primitives_mmx.c
libtool: compile: gcc -DHAVE_CONFIG_H -I. -I./lib -I./src -I./src -I./audio -I./sbc -I./gdbus -I./attrib -I./btio -I./health -D_FORTIFY_SOURCE=2 -finline-functions -fgcse-after-reload -funswitch-loops -funroll-loops -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -Wall -D_FORTIFY_SOURCE=2 -fPIC -g -c sbc/sbc_primitives_mmx.c -fPIC -DPIC -o sbc/.libs/sbc_libsbc_la-sbc_primitives_mmx.o
sbc/sbc_primitives_mmx.c: In function 'sbc_calc_scalefactors_mmx':
sbc/sbc_primitives_mmx.c:294:4: warning: asm operand 2 probably doesn't match constraints [enabled by default]
sbc/sbc_primitives_mmx.c:294:4: error: impossible constraint in 'asm'
make[2]: *** [sbc/sbc_libsbc_la-sbc_primitives_mmx.lo] Error 1

See https://launchpadlibrarian.net/88149127/buildlog_ubuntu-precise-i386.bluez_4.96-3ubuntu4_FAILEDTOBUILD.txt.gz

It appears to be related to this piece of code:

static void sbc_calc_scalefactors_mmx(
        int32_t sb_sample_f[16][2][8],
        uint32_t scale_factor[2][8],
        int blocks, int channels, int subbands)
{
        static const SBC_ALIGNED int32_t consts[2] = {
                1 << SCALE_OUT_BITS,
                1 << SCALE_OUT_BITS,
        };
        int ch, sb;
        intptr_t blk;
        for (ch = 0; ch < channels; ch++) {
                for (sb = 0; sb < subbands; sb += 2) {
                        blk = (blocks - 1) * (((char *) &sb_sample_f[1][0][0] -
                                (char *) &sb_sample_f[0][0][0]));
                       __asm__ volatile (
                                "movq (%4), %%mm0\n"
                        "1:\n"
                                "movq (%1, %0), %%mm1\n"
                                "pxor %%mm2, %%mm2\n"
                                "pcmpgtd %%mm2, %%mm1\n"
                                "paddd (%1, %0), %%mm1\n"
                                "pcmpgtd %%mm1, %%mm2\n"
                                "pxor %%mm2, %%mm1\n"

                                "por %%mm1, %%mm0\n"

                                "sub %2, %0\n"
                                "jns 1b\n"

                                "movd %%mm0, %k0\n"
                                "psrlq $32, %%mm0\n"
                                "bsrl %k0, %k0\n"
                                "subl %5, %k0\n"
                                "movl %k0, (%3)\n"

                                "movd %%mm0, %k0\n"
                                "bsrl %k0, %k0\n"
                                "subl %5, %k0\n"
                                "movl %k0, 4(%3)\n"
                        : "+r" (blk)
                        : "r" (&sb_sample_f[0][ch][sb]),
                                "i" ((char *) &sb_sample_f[1][0][0] -
                                        (char *) &sb_sample_f[0][0][0]),
                                "r" (&scale_factor[ch][sb]),
                                "r" (&consts),
                                "i" (SCALE_OUT_BITS)
                        : "cc", "memory");