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[libc][math] Fix the FTZ/DAZ checks for log1p. (#174424)

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The previous checks will fail with
https://github.com/llvm/llvm-project/pull/174123.
See
https://github.com/llvm/llvm-project/pull/174290#issuecomment-3708052716
for the discussion.
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lntue 2026-01-05 12:08:26 -05:00 committed by GitHub
parent f0ef5dba6d
commit e25eacf10c
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1 changed files with 2 additions and 2 deletions
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4
libc/src/math/generic/log1p.cpp
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@ -935,7 +935,7 @@ LLVM_LIBC_FUNCTION(double, log1p, (double x)) {
// log(1 + x) = nextafter(x, -inf) for FE_DOWNWARD, or
// FE_TOWARDZERO and x > 0,
// = x otherwise.
if (x == 0.0)
if (x + x == 0.0)
return x + x; // Handle FTZ/DAZ correctly.
volatile float tp = 1.0f;
@ -951,7 +951,7 @@ LLVM_LIBC_FUNCTION(double, log1p, (double x)) {
return FPBits_t(x_u + 1).get_val();
}
return (x + x == 0.0) ? x + x : x;
return x;
}
x_dd = fputil::exact_add(1.0, x);
}