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| author | Richard Kenner <kenner@vlsi1.ultra.nyu.edu> | 2003-04-18 22:27:18 +0000 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 2003-04-18 18:27:18 -0400 |
| commit | 21102f257e4fc2ddf71eaa26806b4adb133ff5ad (patch) | |
| tree | 87d6d5d99bfa49b9a7f1e33d4040350b109ccf12 /gcc/expmed.c | |
| parent | 38afb23f55aae5e04bcc5e401ae0fb1d26b0ee22 (diff) | |
| download | gcc-21102f257e4fc2ddf71eaa26806b4adb133ff5ad.tar.gz | |
* expmed.c (mask_rtx): Avoid undefined shifts for BITSIZE of 0.
From-SVN: r65796
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 8 |
1 files changed, 6 insertions, 2 deletions
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 |