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Protect left shift from shifting too far. 

On some systems, 1UL<<X will make a mess if X is the size of
an unsigned long. This especially seems to be a problem on i386
systems. Protect those shifts in the vvp_net.cc.
This commit is contained in:
Stephen Williams 2008-04-22 17:31:08 -07:00
parent a12a6d925a
commit 5ddd35565f
1 changed files with 11 additions and 9 deletions
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20
vvp/vvp_net.cc
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@ -363,12 +363,13 @@ unsigned long* vvp_vector4_t::subarray(unsigned adr, unsigned wid) const
through that word. */
unsigned long atmp = abits_val_ >> adr;
unsigned long btmp = bbits_val_ >> adr;
atmp &= (1UL << wid) - 1;
btmp &= (1UL << wid) - 1;
if (wid < BIT2_PER_WORD) {
atmp &= (1UL << wid) - 1;
btmp &= (1UL << wid) - 1;
}
if (btmp) goto x_out;
val[0] = atmp;
return val;
} else {
@ -385,19 +386,21 @@ unsigned long* vvp_vector4_t::subarray(unsigned adr, unsigned wid) const
btmp >>= off;
unsigned long trans = BITS_PER_WORD - off;
if (trans > (8*sizeof(val[0]) - val_off))
trans = 8*sizeof(val[0]) - val_off;
if (trans > (BIT2_PER_WORD - val_off))
trans = BIT2_PER_WORD - val_off;
if (wid < trans)
trans = wid;
atmp &= (1UL << trans) - 1;
btmp &= (1UL << trans) - 1;
if (trans < BIT2_PER_WORD) {
atmp &= (1UL << trans) - 1;
btmp &= (1UL << trans) - 1;
}
if (btmp) goto x_out;
val[val_ptr] |= atmp << val_off;
adr += trans;
wid -= trans;
val_off += trans;
if (val_off == 8*sizeof(val[0])) {
if (val_off == BIT2_PER_WORD) {
val_ptr += 1;
val_off = 0;
}
@ -572,7 +575,6 @@ void vvp_vector4_t::set_vec(unsigned adr, const vvp_vector4_t&that)
((that.bbits_ptr_[sptr] >> (remain-tail))&mask);
}
}
}
}