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target-alpha: use new float64_unordered_quiet() function

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Use float64_unordered_quiet() in helper_cmptun() instead of doing the
the comparison manually.

According to the "Alpha Compiler Writer's Guide", we should use the
_quiet version here, as CMPTUN and CMPTEQ should generate InvalidOp
for SNaNs but not for QNaNs.

Thanks to Peter Maydell <peter.maydell@linaro.org> and Richard
Henderson <rth@twiddle.net> for digging into the manuals.

Acked-by: Richard Henderson  <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Aurelien Jarno 2011-04-14 00:49:29 +02:00
parent b4a0ef7911
commit a4d2d1a063
1 changed files with 3 additions and 2 deletions
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5
target-alpha/op_helper.c
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@ -904,11 +904,12 @@ uint64_t helper_cmptun (uint64_t a, uint64_t b)
fa = t_to_float64(a);
fb = t_to_float64(b);
if (float64_is_quiet_nan(fa) || float64_is_quiet_nan(fb))
if (float64_unordered_quiet(fa, fb, &FP_STATUS)) {
return 0x4000000000000000ULL;
else
} else {
return 0;
}
}
uint64_t helper_cmpteq(uint64_t a, uint64_t b)
{