diff --git a/src/float/extend.rs b/src/float/extend.rs
index 5b0c0d972..12e5fc9e1 100644
--- a/src/float/extend.rs
+++ b/src/float/extend.rs
@@ -100,19 +100,37 @@ intrinsics! {
 
     #[avr_skip]
     #[aapcs_on_arm]
+    #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
     pub extern "C" fn __extendhftf2(a: f16) -> f128 {
         extend(a)
     }
 
+    #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+    pub extern "C" fn __extendhfkf2(a: f16) -> f128 {
+        extend(a)
+    }
+
     #[avr_skip]
     #[aapcs_on_arm]
+    #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
     pub extern "C" fn __extendsftf2(a: f32) -> f128 {
         extend(a)
     }
 
+    #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+    pub extern "C" fn __extendsfkf2(a: f32) -> f128 {
+        extend(a)
+    }
+
     #[avr_skip]
     #[aapcs_on_arm]
+    #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
     pub extern "C" fn __extenddftf2(a: f64) -> f128 {
         extend(a)
     }
+
+    #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+    pub extern "C" fn __extenddfkf2(a: f64) -> f128 {
+        extend(a)
+    }
 }
diff --git a/src/float/trunc.rs b/src/float/trunc.rs
index b607a6549..31351b5e9 100644
--- a/src/float/trunc.rs
+++ b/src/float/trunc.rs
@@ -155,19 +155,37 @@ intrinsics! {
 
     #[avr_skip]
     #[aapcs_on_arm]
+    #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
     pub extern "C" fn __trunctfhf2(a: f128) -> f16 {
         trunc(a)
     }
 
+    #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+    pub extern "C" fn __trunckfhf2(a: f128) -> f16 {
+        trunc(a)
+    }
+
     #[avr_skip]
     #[aapcs_on_arm]
+    #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
     pub extern "C" fn __trunctfsf2(a: f128) -> f32 {
         trunc(a)
     }
 
+    #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+    pub extern "C" fn __trunckfsf2(a: f128) -> f32 {
+        trunc(a)
+    }
+
     #[avr_skip]
     #[aapcs_on_arm]
+    #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
     pub extern "C" fn __trunctfdf2(a: f128) -> f64 {
         trunc(a)
     }
+
+    #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+    pub extern "C" fn __trunckfdf2(a: f128) -> f64 {
+        trunc(a)
+    }
 }
diff --git a/testcrate/tests/conv.rs b/testcrate/tests/conv.rs
index 5cff01202..f0ef95255 100644
--- a/testcrate/tests/conv.rs
+++ b/testcrate/tests/conv.rs
@@ -187,9 +187,15 @@ fn float_extend() {
     conv!(f32, f64, __extendsfdf2, Single, Double);
     #[cfg(not(feature = "no-f16-f128"))]
     {
+        #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
         use compiler_builtins::float::extend::{
-            __extenddftf2, __extendhfsf2, __extendhftf2, __extendsftf2, __gnu_h2f_ieee,
+            __extenddfkf2 as __extenddftf2, __extendhfkf2 as __extendhftf2,
+            __extendsfkf2 as __extendsftf2,
         };
+        #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
+        use compiler_builtins::float::extend::{__extenddftf2, __extendhftf2, __extendsftf2};
+        use compiler_builtins::float::extend::{__extendhfsf2, __gnu_h2f_ieee};
+
         // FIXME(f16_f128): Also do extend!() for `f16` and `f128` when builtins are in nightly
         conv!(f16, f32, __extendhfsf2, Half, Single);
         conv!(f16, f32, __gnu_h2f_ieee, Half, Single);
@@ -234,9 +240,15 @@ fn float_trunc() {
     conv!(f64, f32, __truncdfsf2, Double, Single);
     #[cfg(not(feature = "no-f16-f128"))]
     {
+        use compiler_builtins::float::trunc::{__gnu_f2h_ieee, __truncdfhf2, __truncsfhf2};
+        #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
         use compiler_builtins::float::trunc::{
-            __gnu_f2h_ieee, __truncdfhf2, __truncsfhf2, __trunctfdf2, __trunctfhf2, __trunctfsf2,
+            __trunckfdf2 as __trunctfdf2, __trunckfhf2 as __trunctfhf2,
+            __trunckfsf2 as __trunctfsf2,
         };
+        #[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
+        use compiler_builtins::float::trunc::{__trunctfdf2, __trunctfhf2, __trunctfsf2};
+
         // FIXME(f16_f128): Also do trunc!() for `f16` and `f128` when builtins are in nightly
         conv!(f32, f16, __truncsfhf2, Single, Half);
         conv!(f32, f16, __gnu_f2h_ieee, Single, Half);