diff options
Diffstat (limited to 'src/math/ilogbf.c')
| -rw-r--r-- | src/math/ilogbf.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/src/math/ilogbf.c b/src/math/ilogbf.c index 42cd62e2..e23ba209 100644 --- a/src/math/ilogbf.c +++ b/src/math/ilogbf.c @@ -3,22 +3,24 @@ int ilogbf(float x) { - union fshape u = {x}; - int e = u.bits>>23 & 0xff; + #pragma STDC FENV_ACCESS ON + union {float f; uint32_t i;} u = {x}; + uint32_t i = u.i; + int e = i>>23 & 0xff; if (!e) { - u.bits <<= 9; - if (u.bits == 0) { + i <<= 9; + if (i == 0) { FORCE_EVAL(0/0.0f); return FP_ILOGB0; } /* subnormal x */ - for (e = -0x7f; u.bits < (uint32_t)1<<31; e--, u.bits<<=1); + for (e = -0x7f; i>>31 == 0; e--, i<<=1); return e; } if (e == 0xff) { FORCE_EVAL(0/0.0f); - return u.bits<<9 ? FP_ILOGBNAN : INT_MAX; + return i<<9 ? FP_ILOGBNAN : INT_MAX; } return e - 0x7f; } |