bit shifting safety

 * add u3, u4, u5, u6, u7 and i3, i4, i5, i6, i7
 * shift operations shift amount parameter type is
   integer with log2 bit width of other param
   - This enforces not violating undefined behavior on
     shift amount >= bit width with the type system
 * clean up math.log, math.ln, math.log2, math.log10

closes #403

1 files changed, 2 insertions, 3 deletions

diff --git a/std/math/ceil.zig b/std/math/ceil.zig
index 933182e771..d88031243b 100644
--- a/std/math/ceil.zig
+++ b/std/math/ceil.zig
@@ -32,9 +32,8 @@ fn ceil32(x: f32) -> f32 {
 
     if (e >= 23) {
         return x;
-    }
-    else if (e >= 0) {
-        m = 0x007FFFFF >> u32(e);
+    } else if (e >= 0) {
+        m = u32(0x007FFFFF) >> u5(e);
         if (u & m == 0) {
             return x;
         }