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cxxrtl: fix rzext().

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This was a correctness issue, but one of the consequences is that it
resulted in jumps in generated machine code where there should have
been none. As a side effect of fixing the bug, Minerva SoC became 10%
faster.
This commit is contained in:
whitequark 2020-06-13 00:49:44 +00:00
parent a5f0cb4eba
commit 6cf02ed94f
1 changed files with 2 additions and 2 deletions
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4
backends/cxxrtl/cxxrtl.h
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@ -165,8 +165,8 @@ struct value : public expr_base<value<Bits>> {
carry = (shift_bits == 0) ? 0 carry = (shift_bits == 0) ? 0
: data[n] >> (chunk::bits - shift_bits); : data[n] >> (chunk::bits - shift_bits);
} }
if (carry != 0) if (shift_chunks + chunks < result.chunks)
result.data[result.chunks - 1] = carry; result.data[shift_chunks + chunks] = carry;
return result; return result;
} }