uefi-std: Drop fmodf

Some math functions are exposed through compiler-builtins on newer
releases.

Fixes building system76/firmware-setup with new toolchain.

Ref: rust-lang/compiler-builtins#435
Signed-off-by: Tim Crawford <tcrawford@system76.com>

Author: crawfxrd

crates/uefi_std/src/rt/math.rs

@@ -1,121 +1,3 @@
-/*
- * Copyright (c) 2018 Jorge Aparicio
- *
- * Permission is hereby granted, free of charge, to any
- * person obtaining a copy of this software and associated
- * documentation files (the "Software"), to deal in the
- * Software without restriction, including without
- * limitation the rights to use, copy, modify, merge,
- * publish, distribute, sublicense, and/or sell copies of
- * the Software, and to permit persons to whom the Software
- * is furnished to do so, subject to the following
- * conditions:
- *
- * The above copyright notice and this permission notice
- * shall be included in all copies or substantial portions
- * of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
- * ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
- * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
- * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
- * SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
- * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
- * IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- */
-
-use core::f32;
-use core::u32;
-
-#[no_mangle]
-pub fn fmodf(x: f32, y: f32) -> f32 {
-    let mut uxi = x.to_bits();
-    let mut uyi = y.to_bits();
-    let mut ex = (uxi >> 23 & 0xff) as i32;
-    let mut ey = (uyi >> 23 & 0xff) as i32;
-    let sx = uxi & 0x80000000;
-    let mut i;
-
-    if uyi << 1 == 0 || y.is_nan() || ex == 0xff {
-        return (x * y) / (x * y);
-    }
-
-    if uxi << 1 <= uyi << 1 {
-        if uxi << 1 == uyi << 1 {
-            return 0.0 * x;
-        }
-
-        return x;
-    }
-
-    /* normalize x and y */
-    if ex == 0 {
-        i = uxi << 9;
-        while i >> 31 == 0 {
-            ex -= 1;
-            i <<= 1;
-        }
-
-        uxi <<= -ex + 1;
-    } else {
-        uxi &= u32::MAX >> 9;
-        uxi |= 1 << 23;
-    }
-
-    if ey == 0 {
-        i = uyi << 9;
-        while i >> 31 == 0 {
-            ey -= 1;
-            i <<= 1;
-        }
-
-        uyi <<= -ey + 1;
-    } else {
-        uyi &= u32::MAX >> 9;
-        uyi |= 1 << 23;
-    }
-
-    /* x mod y */
-    while ex > ey {
-        i = uxi - uyi;
-        if i >> 31 == 0 {
-            if i == 0 {
-                return 0.0 * x;
-            }
-            uxi = i;
-        }
-        uxi <<= 1;
-
-        ex -= 1;
-    }
-
-    i = uxi - uyi;
-    if i >> 31 == 0 {
-        if i == 0 {
-            return 0.0 * x;
-        }
-        uxi = i;
-    }
-
-    while uxi >> 23 == 0 {
-        uxi <<= 1;
-        ex -= 1;
-    }
-
-    /* scale result up */
-    if ex > 0 {
-        uxi -= 1 << 23;
-        uxi |= (ex as u32) << 23;
-    } else {
-        uxi >>= -ex + 1;
-    }
-    uxi |= sx;
-
-    f32::from_bits(uxi)
-}
-
 /* origin: FreeBSD /usr/src/lib/msun/src/e_sqrtf.c */
 /*
  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.