avoid changing NaNs in sqrt (x86 asm) to satisfy c99 f.9 recommendation

[musl] / src / math / i386 / sqrt.s

diff --git a/src/math/i386/sqrt.s b/src/math/i386/sqrt.s
index 8289d09..3315704 100644 (file)
--- a/src/math/i386/sqrt.s
+++ b/src/math/i386/sqrt.s
@@ -10,6 +10,10 @@ sqrt:        fldl 4(%esp)
        and $0x7ff,%ecx
        cmp $0x400,%ecx
        jnz 1f
+       mov 8(%esp),%ecx
+       or $0xffff8000,%ecx
+       inc %ecx
+       jz 1f
        and $0x200,%eax
        sub $0x100,%eax
        sub %eax,(%esp)