compiler_rt: avoid weak aliases on Windows

When exporting math functions for Windows, we provide weak exports of
'l' variants rather than weak aliases. We still use aliases on other
operating systems so that the 'l' variants have one less jump
instruction in this case.

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/compiler_rt/exp2.zig b/lib/compiler_rt/exp2.zig
index 53432a831d..cbcb53c99f 100644
--- a/lib/compiler_rt/exp2.zig
+++ b/lib/compiler_rt/exp2.zig
@@ -149,6 +149,17 @@ pub fn exp2q(x: f128) callconv(.C) f128 {
     return exp2(@floatCast(f64, x));
 }
 
+pub fn exp2l(x: c_longdouble) callconv(.C) c_longdouble {
+    switch (@typeInfo(c_longdouble).Float.bits) {
+        16 => return __exp2h(x),
+        32 => return exp2f(x),
+        64 => return exp2(x),
+        80 => return __exp2x(x),
+        128 => return exp2q(x),
+        else => @compileError("unreachable"),
+    }
+}
+
 const exp2ft = [_]f64{
     0x1.6a09e667f3bcdp-1,
     0x1.7a11473eb0187p-1,