Sometimes the compiler is very right! Found bug in bessel routines for float.
Original compiler error:
target arm C: libm <= bionic/libm/src/e_j0f.c
bionic/libm/src/e_j0f.c: In function 'j0f':
bionic/libm/src/e_j0f.c:66: warning: comparison between signed and unsigned integer expressions
bionic/libm/src/e_j0f.c: In function 'y0f':
bionic/libm/src/e_j0f.c:140: warning: comparison between signed and unsigned integer expressions
target arm C: libm <= bionic/libm/src/e_j1.c
It's subtle but ix is masked with 0x7f000000 so it can never ever have a value
greater than 0x80000000. So I switched to using the unmasked hx and added a
cast as a reward to the compiler for being right.
I checked the original routines that e_j0f.c was ported from (in e_j0.c) and
the double's don't use 0x80000000 so this issue didn't exist there.
Let that be a warning to those that just slap on casts to shut up the compiler,
sometimes it's sniffed out a bug for you. :-)
Similar fixes in the other functions.
Change-Id: I7a776e5d4721fc3a9e3bd89179b67e9af3a2ebfa
diff --git a/libm/src/e_jnf.c b/libm/src/e_jnf.c
index 029dba6..a61fb68 100644
--- a/libm/src/e_jnf.c
+++ b/libm/src/e_jnf.c
@@ -186,7 +186,7 @@
b = __ieee754_y1f(x);
/* quit if b is -inf */
GET_FLOAT_WORD(ib,b);
- for(i=1;i<n&&ib!=0xff800000;i++){
+ for(i=1; i<n && (((uint32_t)ib) != 0xff800000); i++){
temp = b;
b = ((float)(i+i)/x)*b - a;
GET_FLOAT_WORD(ib,b);