Daan De Meyer
56bc502f6f
Add -fexcess-precision=standard so gcc inserts ISO C99 conformant rounding at assignments, casts, and returns — without it, double values on x87 happily stay at 80-bit extended precision across operations and diverge from the SSE/x86_64 behavior, making strict equality comparisons architecture-dependent. The flag doesn't fully cover x87: per gcc PR#323 (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=323), a function return value carried in ST(0) can arrive at the caller still at 80-bit, so a double that ought to compare equal to a same-magnitude literal picks up extra mantissa bits and doesn't. Wrap fp_equal in volatile-double temporaries to force a memory roundtrip — the only operation that reliably truncates on x87 — so its callers get consistent results regardless of how the operands were produced. Add a TEST(fp_equal) case that exercises the previously-broken pattern: a runtime 1.0/10.0 computed inside a noinline helper, returned across the function ABI boundary, then compared against the literal 0.1. Without the volatile truncation this assertion fails on 32-bit gcc.
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