diff --git a/library/compiler-builtins/libm/ci/run-docker.sh b/library/compiler-builtins/libm/ci/run-docker.sh
index e7b80c719e5c..c7ad60fd499d 100755
--- a/library/compiler-builtins/libm/ci/run-docker.sh
+++ b/library/compiler-builtins/libm/ci/run-docker.sh
@@ -18,7 +18,7 @@ run() {
            --user $(id -u):$(id -g) \
            -e CARGO_HOME=/cargo \
            -e CARGO_TARGET_DIR=/target \
-           -v $(dirname $(dirname `which cargo`)):/cargo \
+           -v "${HOME}/.cargo":/cargo \
            -v `pwd`/target:/target \
            -v `pwd`:/checkout:ro \
            -v `rustc --print sysroot`:/rust:ro \
diff --git a/library/compiler-builtins/libm/src/math/ceilf.rs b/library/compiler-builtins/libm/src/math/ceilf.rs
index f1edbd061bf7..7bcc647ca76a 100644
--- a/library/compiler-builtins/libm/src/math/ceilf.rs
+++ b/library/compiler-builtins/libm/src/math/ceilf.rs
@@ -40,6 +40,8 @@ pub fn ceilf(x: f32) -> f32 {
     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::*;
diff --git a/library/compiler-builtins/libm/src/math/fabsf.rs b/library/compiler-builtins/libm/src/math/fabsf.rs
index 6655c4c3ccc7..23f3646dc4a5 100644
--- a/library/compiler-builtins/libm/src/math/fabsf.rs
+++ b/library/compiler-builtins/libm/src/math/fabsf.rs
@@ -14,6 +14,8 @@ pub fn fabsf(x: f32) -> f32 {
     f32::from_bits(x.to_bits() & 0x7fffffff)
 }
 
+// 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::*;
diff --git a/library/compiler-builtins/libm/src/math/floorf.rs b/library/compiler-builtins/libm/src/math/floorf.rs
index 287f08642778..dfdab91a0f69 100644
--- a/library/compiler-builtins/libm/src/math/floorf.rs
+++ b/library/compiler-builtins/libm/src/math/floorf.rs
@@ -40,6 +40,8 @@ pub fn floorf(x: f32) -> f32 {
     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::*;
diff --git a/library/compiler-builtins/libm/src/math/j1f.rs b/library/compiler-builtins/libm/src/math/j1f.rs
index 5095894d7a1d..33694908ca23 100644
--- a/library/compiler-builtins/libm/src/math/j1f.rs
+++ b/library/compiler-builtins/libm/src/math/j1f.rs
@@ -357,6 +357,8 @@ fn qonef(x: f32) -> f32 {
     return (0.375 + r / s) / x;
 }
 
+// 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::{j1f, y1f};
diff --git a/library/compiler-builtins/libm/src/math/roundf.rs b/library/compiler-builtins/libm/src/math/roundf.rs
index c0872a7829d5..becdb5620a90 100644
--- a/library/compiler-builtins/libm/src/math/roundf.rs
+++ b/library/compiler-builtins/libm/src/math/roundf.rs
@@ -7,6 +7,8 @@ pub fn roundf(x: f32) -> f32 {
     truncf(x + copysignf(0.5 - 0.25 * f32::EPSILON, x))
 }
 
+// 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::roundf;
diff --git a/library/compiler-builtins/libm/src/math/sincosf.rs b/library/compiler-builtins/libm/src/math/sincosf.rs
index 2725caad63c7..83c9f40ee3a0 100644
--- a/library/compiler-builtins/libm/src/math/sincosf.rs
+++ b/library/compiler-builtins/libm/src/math/sincosf.rs
@@ -122,6 +122,8 @@ pub fn sincosf(x: f32) -> (f32, f32) {
     }
 }
 
+// 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::sincosf;
diff --git a/library/compiler-builtins/libm/src/math/sqrtf.rs b/library/compiler-builtins/libm/src/math/sqrtf.rs
index ee868c8c8111..00b20e578be9 100644
--- a/library/compiler-builtins/libm/src/math/sqrtf.rs
+++ b/library/compiler-builtins/libm/src/math/sqrtf.rs
@@ -128,6 +128,8 @@ pub fn sqrtf(x: f32) -> f32 {
     }
 }
 
+// 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::*;
diff --git a/library/compiler-builtins/libm/src/math/truncf.rs b/library/compiler-builtins/libm/src/math/truncf.rs
index a4c001629a24..20d5b73bd675 100644
--- a/library/compiler-builtins/libm/src/math/truncf.rs
+++ b/library/compiler-builtins/libm/src/math/truncf.rs
@@ -31,6 +31,8 @@ pub fn truncf(x: f32) -> f32 {
     f32::from_bits(i)
 }
 
+// PowerPC tests are failing on LLVM 13: https://github.com/rust-lang/rust/issues/88520
+#[cfg(not(target_arch = "powerpc64"))]
 #[cfg(test)]
 mod tests {
     #[test]