simplify nan check in sqrt (x86 asm); result of sqrt is never negative

diff --git a/src/math/i386/sqrt.s b/src/math/i386/sqrt.s
index 3315704..1bd3b05 100644 (file)
--- a/src/math/i386/sqrt.s
+++ b/src/math/i386/sqrt.s
@@ -10,10 +10,9 @@ sqrt:        fldl 4(%esp)
        and $0x7ff,%ecx
        cmp $0x400,%ecx
        jnz 1f
-       mov 8(%esp),%ecx
-       or $0xffff8000,%ecx
-       inc %ecx
-       jz 1f
+       mov 8(%esp),%cx
+       inc %cx
+       jo 1f
        and $0x200,%eax
        sub $0x100,%eax
        sub %eax,(%esp)