1 files changed, 66 insertions, 0 deletions
diff --git a/vendor/compiler_builtins/libm/src/math/floorf.rs b/vendor/compiler_builtins/libm/src/math/floorf.rs
new file mode 100644
index 000000000..dfdab91a0
--- /dev/null
+++ b/vendor/compiler_builtins/libm/src/math/floorf.rs
@@ -0,0 +1,66 @@
+use core::f32;
+
+/// Floor (f32)
+///
+/// Finds the nearest integer less than or equal to `x`.
+#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
+pub fn floorf(x: f32) -> f32 {
+    // On wasm32 we know that LLVM's intrinsic will compile to an optimized
+    // `f32.floor` native instruction, so we can leverage this for both code size
+    // and speed.
+    llvm_intrinsically_optimized! {
+        #[cfg(target_arch = "wasm32")] {
+            return unsafe { ::core::intrinsics::floorf32(x) }
+        }
+    }
+    let mut ui = x.to_bits();
+    let e = (((ui >> 23) as i32) & 0xff) - 0x7f;
+
+    if e >= 23 {
+        return x;
+    }
+    if e >= 0 {
+        let m: u32 = 0x007fffff >> e;
+        if (ui & m) == 0 {
+            return x;
+        }
+        force_eval!(x + f32::from_bits(0x7b800000));
+        if ui >> 31 != 0 {
+            ui += m;
+        }
+        ui &= !m;
+    } else {
+        force_eval!(x + f32::from_bits(0x7b800000));
+        if ui >> 31 == 0 {
+            ui = 0;
+        } else if ui << 1 != 0 {
+            return -1.0;
+        }
+    }
+    f32::from_bits(ui)
+}
+
+// PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520
+#[cfg(not(target_arch = "powerpc64"))]
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use core::f32::*;
+
+    #[test]
+    fn sanity_check() {
+        assert_eq!(floorf(0.5), 0.0);
+        assert_eq!(floorf(1.1), 1.0);
+        assert_eq!(floorf(2.9), 2.0);
+    }
+
+    /// The spec: https://en.cppreference.com/w/cpp/numeric/math/floor
+    #[test]
+    fn spec_tests() {
+        // Not Asserted: that the current rounding mode has no effect.
+        assert!(floorf(NAN).is_nan());
+        for f in [0.0, -0.0, INFINITY, NEG_INFINITY].iter().copied() {
+            assert_eq!(floorf(f), f);
+        }
+    }
+}