diff --git a/library/core/src/num/dec2flt/common.rs b/library/core/src/num/dec2flt/common.rs
index 17957d7e77048..3e8d75df37868 100644
--- a/library/core/src/num/dec2flt/common.rs
+++ b/library/core/src/num/dec2flt/common.rs
@@ -192,6 +192,7 @@ pub struct BiasedFp {
 }
 
 impl BiasedFp {
+    #[inline]
     pub const fn zero_pow2(e: i32) -> Self {
         Self { f: 0, e }
     }
diff --git a/library/core/src/num/dec2flt/float.rs b/library/core/src/num/dec2flt/float.rs
index 5921c5ed47257..1c9d68999d6f8 100644
--- a/library/core/src/num/dec2flt/float.rs
+++ b/library/core/src/num/dec2flt/float.rs
@@ -118,11 +118,13 @@ impl RawFloat for f32 {
     const SMALLEST_POWER_OF_TEN: i32 = -65;
     const LARGEST_POWER_OF_TEN: i32 = 38;
 
+    #[inline]
     fn from_u64(v: u64) -> Self {
         debug_assert!(v <= Self::MAX_MANTISSA_FAST_PATH);
         v as _
     }
 
+    #[inline]
     fn from_u64_bits(v: u64) -> Self {
         f32::from_bits((v & 0xFFFFFFFF) as u32)
     }
@@ -169,11 +171,13 @@ impl RawFloat for f64 {
     const SMALLEST_POWER_OF_TEN: i32 = -342;
     const LARGEST_POWER_OF_TEN: i32 = 308;
 
+    #[inline]
     fn from_u64(v: u64) -> Self {
         debug_assert!(v <= Self::MAX_MANTISSA_FAST_PATH);
         v as _
     }
 
+    #[inline]
     fn from_u64_bits(v: u64) -> Self {
         f64::from_bits(v)
     }
diff --git a/library/core/src/num/dec2flt/lemire.rs b/library/core/src/num/dec2flt/lemire.rs
index 9f7594460a1d5..3bc052df7a6c1 100644
--- a/library/core/src/num/dec2flt/lemire.rs
+++ b/library/core/src/num/dec2flt/lemire.rs
@@ -118,10 +118,12 @@ pub fn compute_float<F: RawFloat>(q: i64, mut w: u64) -> BiasedFp {
 /// This uses a pre-computed integer approximation for
 /// log2(10), where 217706 / 2^16 is accurate for the
 /// entire range of non-finite decimal exponents.
+#[inline]
 fn power(q: i32) -> i32 {
     (q.wrapping_mul(152_170 + 65536) >> 16) + 63
 }
 
+#[inline]
 fn full_multiplication(a: u64, b: u64) -> (u64, u64) {
     let r = (a as u128) * (b as u128);
     (r as u64, (r >> 64) as u64)
diff --git a/library/core/src/num/dec2flt/mod.rs b/library/core/src/num/dec2flt/mod.rs
index f8d493e8b6276..58ffb950ad86b 100644
--- a/library/core/src/num/dec2flt/mod.rs
+++ b/library/core/src/num/dec2flt/mod.rs
@@ -147,7 +147,13 @@ macro_rules! from_str_float_impl {
             /// representable floating-point number to the number represented
             /// by `src` (following the same rules for rounding as for the
             /// results of primitive operations).
-            #[inline]
+            // We add the `#[inline(never)]` attribute, since its content will
+            // be filled with that of `dec2flt`, which has #[inline(always)].
+            // Since `dec2flt` is generic, a normal inline attribute on this function
+            // with `dec2flt` having no attributes results in heavily repeated
+            // generation of `dec2flt`, despite the fact only a maximum of 2
+            // possible instances can ever exist. Adding #[inline(never)] avoids this.
+            #[inline(never)]
             fn from_str(src: &str) -> Result<Self, ParseFloatError> {
                 dec2flt(src)
             }
@@ -202,12 +208,14 @@ impl fmt::Display for ParseFloatError {
     }
 }
 
+#[inline]
 pub(super) fn pfe_empty() -> ParseFloatError {
     ParseFloatError { kind: FloatErrorKind::Empty }
 }
 
 // Used in unit tests, keep public.
 // This is much better than making FloatErrorKind and ParseFloatError::kind public.
+#[inline]
 pub fn pfe_invalid() -> ParseFloatError {
     ParseFloatError { kind: FloatErrorKind::Invalid }
 }
@@ -220,6 +228,7 @@ fn biased_fp_to_float<T: RawFloat>(x: BiasedFp) -> T {
 }
 
 /// Converts a decimal string into a floating point number.
+#[inline(always)] // Will be inlined into a function with `#[inline(never)]`, see above
 pub fn dec2flt<F: RawFloat>(s: &str) -> Result<F, ParseFloatError> {
     let mut s = s.as_bytes();
     let c = if let Some(&c) = s.first() {
diff --git a/library/core/src/num/dec2flt/number.rs b/library/core/src/num/dec2flt/number.rs
index 405f7e7b6135d..8589e2bbd4fac 100644
--- a/library/core/src/num/dec2flt/number.rs
+++ b/library/core/src/num/dec2flt/number.rs
@@ -33,6 +33,7 @@ pub struct Number {
 
 impl Number {
     /// Detect if the float can be accurately reconstructed from native floats.
+    #[inline]
     fn is_fast_path<F: RawFloat>(&self) -> bool {
         F::MIN_EXPONENT_FAST_PATH <= self.exponent
             && self.exponent <= F::MAX_EXPONENT_DISGUISED_FAST_PATH