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Fix FP.eq simplification for nonzero numerals and add round-trip regression test

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copilot-swe-agent[bot] 2026-06-26 05:38:19 +00:00 • committed by GitHub
parent f1daa2828b
commit 03a386627a
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2 changed files with 21 additions and 0 deletions
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9
src/ast/rewriter/fpa_rewriter.cpp
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@ -474,6 +474,15 @@ br_status fpa_rewriter::mk_float_eq(expr * arg1, expr * arg2, expr_ref & result)
return BR_DONE;
}
if (m_util.is_numeral(arg1, v1) && !m_fm.is_nan(v1) && !m_fm.is_zero(v1)) {
result = m().mk_eq(arg2, arg1);
return BR_REWRITE3;
}
if (m_util.is_numeral(arg2, v2) && !m_fm.is_nan(v2) && !m_fm.is_zero(v2)) {
result = m().mk_eq(arg1, arg2);
return BR_REWRITE3;
}
return BR_FAILED;
}

12
src/test/fpa.cpp
View file

@ -95,8 +95,20 @@ static void test_recfun_defined_function_soundness() {
false);
}
static void test_to_fp_from_to_real_roundtrip() {
run_fp_test(
"(declare-fun a () Float32)\n"
"(declare-fun t () Float32)\n"
"(assert (fp.eq a ((_ to_fp 8 24) RNE 1.0)))\n"
"(assert (fp.eq t ((_ to_fp 8 24) RNE 0.8)))\n"
"(assert (fp.eq (fp.add RNE a t) ((_ to_fp 8 24) RNE (+ 1.0 (fp.to_real t)))))\n"
"(check-sat)\n",
true);
}
void tst_fpa() {
test_fp_to_real_denormal();
test_to_fp_from_real_interval();
test_recfun_defined_function_soundness();
test_to_fp_from_to_real_roundtrip();
}