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| author | nsz <nsz@port70.net> | 2012-05-08 00:22:56 +0200 |
|---|---|---|
| committer | nsz <nsz@port70.net> | 2012-05-08 00:22:56 +0200 |
| commit | 3738a96e052603403e085e9a1024289ba3e09188 (patch) | |
| tree | fb183fb5fc9f79797bd38f87aa7f51261ef9da44 /src/math/remquo.c | |
| parent | 0e195dfaa4902a73179f7ab296d47f01d3518ad3 (diff) | |
| download | musl-3738a96e052603403e085e9a1024289ba3e09188.tar.gz musl-3738a96e052603403e085e9a1024289ba3e09188.tar.bz2 musl-3738a96e052603403e085e9a1024289ba3e09188.tar.xz musl-3738a96e052603403e085e9a1024289ba3e09188.zip | |
math: fix remquo.c when x==-y and a subnormal remainder bug as well
backported fix from freebsd:
http://svnweb.FreeBSD.org/base?view=revision&revision=233973
Diffstat (limited to 'src/math/remquo.c')
| -rw-r--r-- | src/math/remquo.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/math/remquo.c b/src/math/remquo.c index e92984ed..085466e6 100644 --- a/src/math/remquo.c +++ b/src/math/remquo.c @@ -44,7 +44,7 @@ double remquo(double x, double y, int *quo) goto fixup; } if (lx == ly) { /* |x| = |y| return x*0 */ - *quo = 1; + *quo = sxy ? -1 : 1; return Zero[(uint32_t)sx>>31]; } } @@ -127,6 +127,7 @@ double remquo(double x, double y, int *quo) /* convert back to floating value and restore the sign */ if ((hx|lx) == 0) { /* return sign(x)*0 */ + q &= 0x7fffffff; *quo = sxy ? -q : q; return Zero[(uint32_t)sx>>31]; } @@ -144,10 +145,10 @@ double remquo(double x, double y, int *quo) hx >>= n; } else if (n <= 31) { lx = (hx<<(32-n))|(lx>>n); - hx = sx; + hx = 0; } else { lx = hx>>(n-32); - hx = sx; + hx = 0; } } fixup: |