Take upstream libm changes.
Mostly workarounds for GCC and Clang bugs.
Change-Id: I4ef428a42d4ac6d622659053711a8cc416925727
diff --git a/libm/upstream-freebsd/lib/msun/src/s_fmal.c b/libm/upstream-freebsd/lib/msun/src/s_fmal.c
index c2a6913..9271901 100644
--- a/libm/upstream-freebsd/lib/msun/src/s_fmal.c
+++ b/libm/upstream-freebsd/lib/msun/src/s_fmal.c
@@ -226,6 +226,8 @@
zs = copysignl(LDBL_MIN, zs);
fesetround(FE_TONEAREST);
+ /* work around clang bug 8100 */
+ volatile long double vxs = xs;
/*
* Basic approach for round-to-nearest:
@@ -235,7 +237,7 @@
* adj = xy.lo + r.lo (inexact; low bit is sticky)
* result = r.hi + adj (correctly rounded)
*/
- xy = dd_mul(xs, ys);
+ xy = dd_mul(vxs, ys);
r = dd_add(xy.hi, zs);
spread = ex + ey;
@@ -256,7 +258,9 @@
* rounding modes.
*/
fesetround(oround);
- adj = r.lo + xy.lo;
+ /* work around clang bug 8100 */
+ volatile long double vrlo = r.lo;
+ adj = vrlo + xy.lo;
return (ldexpl(r.hi + adj, spread));
}