add SPE FPU support to powerpc-sf

[musl] / src / math / ilogb.c

diff --git a/src/math/ilogb.c b/src/math/ilogb.c
index 5a1819d..64d4015 100644 (file)
--- a/src/math/ilogb.c
+++ b/src/math/ilogb.c
@@ -3,22 +3,24 @@
 
 int ilogb(double x)
 {
-       union dshape u = {x};
-       int e = u.bits>>52 & 0x7ff;
+       #pragma STDC FENV_ACCESS ON
+       union {double f; uint64_t i;} u = {x};
+       uint64_t i = u.i;
+       int e = i>>52 & 0x7ff;
 
        if (!e) {
-               u.bits <<= 12;
-               if (u.bits == 0) {
+               i <<= 12;
+               if (i == 0) {
                        FORCE_EVAL(0/0.0f);
                        return FP_ILOGB0;
                }
                /* subnormal x */
-               for (e = -0x3ff; u.bits < (uint64_t)1<<63; e--, u.bits<<=1);
+               for (e = -0x3ff; i>>63 == 0; e--, i<<=1);
                return e;
        }
        if (e == 0x7ff) {
                FORCE_EVAL(0/0.0f);
-               return u.bits<<12 ? FP_ILOGBNAN : INT_MAX;
+               return i<<12 ? FP_ILOGBNAN : INT_MAX;
        }
        return e - 0x3ff;
 }