diff options
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/expmed.c | 8 |
2 files changed, 10 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 0847ad9610d..3df6d2ccb32 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +2003-04-18 Richard Kenner <kenner@vlsi1.ultra.nyu.edu> + + * expmed.c (mask_rtx): Avoid undefined shifts for BITSIZE of 0. + 2003-04-18 Olivier Hainque <hainque@act-europe.fr> * calls.c (expand_call): Move special case for constructor calls diff --git a/gcc/expmed.c b/gcc/expmed.c index 33d815280bf..b48576bfc78 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -1698,7 +1698,9 @@ mask_rtx (mode, bitpos, bitsize, complement) { HOST_WIDE_INT masklow, maskhigh; - if (bitpos < HOST_BITS_PER_WIDE_INT) + if (bitsize == 0) + masklow = 0; + else if (bitpos < HOST_BITS_PER_WIDE_INT) masklow = (HOST_WIDE_INT) -1 << bitpos; else masklow = 0; @@ -1712,7 +1714,9 @@ mask_rtx (mode, bitpos, bitsize, complement) else maskhigh = (HOST_WIDE_INT) -1 << (bitpos - HOST_BITS_PER_WIDE_INT); - if (bitpos + bitsize > HOST_BITS_PER_WIDE_INT) + if (bitsize == 0) + maskhigh = 0; + else if (bitpos + bitsize > HOST_BITS_PER_WIDE_INT) maskhigh &= ((unsigned HOST_WIDE_INT) -1 >> (2 * HOST_BITS_PER_WIDE_INT - bitpos - bitsize)); else |