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Fix for lossless width estimation in shift operations. 

If the right hand operand of a shift is a signed vector value, it
is coerced to an unsigned value. This needs to be allowed for when
estimating the width expansion caused by a shift in a lossless
expression.
This commit is contained in:
Martin Whitaker 2011-04-11 22:20:52 +01:00 committed by Stephen Williams
parent 2517ba9041
commit f34a3020a6
1 changed files with 1 additions and 1 deletions
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2
elab_expr.cc
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@ -625,7 +625,7 @@ unsigned PEBLeftWidth::test_width(Design*des, NetScope*scope, width_mode_t&mode)
long r_val = LONG_MAX; long r_val = LONG_MAX;
if (r_width < sizeof(long)*8) { if (r_width < sizeof(long)*8) {
r_val = (1L << r_width) - 1L; r_val = (1L << r_width) - 1L;
if (right_->has_sign()) if ((op_ == 'p') && right_->has_sign())
r_val >>= 1; r_val >>= 1;
} }