diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2016-02-26 13:46:26 +0100 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-12-22 16:23:44 +0100 |
| commit | 0e1eae2145c03ef30ccdef288ce8eac8c70e2363 (patch) | |
| tree | edc2a7b8f364d034b0bf3fa81044295b7358deae /lib/mpi | |
| parent | 8b2f8ad002b4927578593f0ecaa89663b01e7815 (diff) | |
lib/mpi: avoid assembler warning
A wrapper around the umull assembly instruction might reuse
the input register as an output, which is undefined on
some ARM machines, as pointed out by this assembler warning:
CC lib/mpi/generic_mpih-mul1.o
/tmp/ccxJuxIy.s: Assembler messages:
/tmp/ccxJuxIy.s:53: rdhi, rdlo and rm must all be different
CC lib/mpi/generic_mpih-mul2.o
/tmp/ccI0scAD.s: Assembler messages:
/tmp/ccI0scAD.s:53: rdhi, rdlo and rm must all be different
CC lib/mpi/generic_mpih-mul3.o
/tmp/ccMvVQcp.s: Assembler messages:
/tmp/ccMvVQcp.s:53: rdhi, rdlo and rm must all be different
This changes the constraints to force different registers to
be used as output.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'lib/mpi')
| -rw-r--r-- | lib/mpi/longlong.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mpi/longlong.h b/lib/mpi/longlong.h index b90e255c2..93336502a 100644 --- a/lib/mpi/longlong.h +++ b/lib/mpi/longlong.h @@ -216,7 +216,7 @@ extern UDItype __udiv_qrnnd(UDItype *, UDItype, UDItype, UDItype); __asm__ ("%@ Inlined umul_ppmm\n" \ "umull %r1, %r0, %r2, %r3" \ : "=&r" ((USItype)(xh)), \ - "=r" ((USItype)(xl)) \ + "=&r" ((USItype)(xl)) \ : "r" ((USItype)(a)), \ "r" ((USItype)(b)) \ : "r0", "r1") |