Auto merge of rust-lang#127719 - devnexen:math_log_fix_solill, r=Amanieu

std: removes logarithms family function edge cases handling for solaris.

Issue had been fixed over time with solaris, 11.x behaves correctly
 (and we support it as minimum), illumos works correctly too.

std/src/f64.rs

@@ -520,7 +520,7 @@ impl f64 {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
     pub fn ln(self) -> f64 {
-        crate::sys::log_wrapper(self, |n| unsafe { intrinsics::logf64(n) })
+        unsafe { intrinsics::logf64(self) }
     }
 
     /// Returns the logarithm of the number with respect to an arbitrary base.
@@ -574,7 +574,7 @@ impl f64 {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
     pub fn log2(self) -> f64 {
-        crate::sys::log_wrapper(self, crate::sys::log2f64)
+        crate::sys::log2f64(self)
     }
 
     /// Returns the base 10 logarithm of the number.
@@ -599,7 +599,7 @@ impl f64 {
     #[stable(feature = "rust1", since = "1.0.0")]
     #[inline]
     pub fn log10(self) -> f64 {
-        crate::sys::log_wrapper(self, |n| unsafe { intrinsics::log10f64(n) })
+        unsafe { intrinsics::log10f64(self) }
     }
 
     /// The positive difference of two numbers.

std/src/sys/pal/mod.rs

@@ -94,36 +94,5 @@ cfg_if::cfg_if! {
     }
 }
 
-// Solaris/Illumos requires a wrapper around log, log2, and log10 functions
-// because of their non-standard behavior (e.g., log(-n) returns -Inf instead
-// of expected NaN).
-#[cfg(not(test))]
-#[cfg(any(target_os = "solaris", target_os = "illumos"))]
-#[inline]
-pub fn log_wrapper<F: Fn(f64) -> f64>(n: f64, log_fn: F) -> f64 {
-    if n.is_finite() {
-        if n > 0.0 {
-            log_fn(n)
-        } else if n == 0.0 {
-            f64::NEG_INFINITY // log(0) = -Inf
-        } else {
-            f64::NAN // log(-n) = NaN
-        }
-    } else if n.is_nan() {
-        n // log(NaN) = NaN
-    } else if n > 0.0 {
-        n // log(Inf) = Inf
-    } else {
-        f64::NAN // log(-Inf) = NaN
-    }
-}
-
-#[cfg(not(test))]
-#[cfg(not(any(target_os = "solaris", target_os = "illumos")))]
-#[inline]
-pub fn log_wrapper<F: Fn(f64) -> f64>(n: f64, log_fn: F) -> f64 {
-    log_fn(n)
-}
-
 #[cfg(not(target_os = "uefi"))]
 pub type RawOsError = i32;