diff --git a/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs b/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs
index c487914bc362f..a27bc16bc39b1 100644
--- a/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs
+++ b/compiler/rustc_sanitizers/src/cfi/typeid/itanium_cxx_abi/encode.rs
@@ -472,6 +472,13 @@ pub(crate) fn encode_ty<'tcx>(
                 FloatTy::F64 => "d",
                 FloatTy::F128 => match tcx.sess.target.arch {
                     Arch::PowerPC | Arch::PowerPC64 => "u9__ieee128", // "g" is used for __ibm128
+                    // Clang is more friendly toward `long double`, and not all platforms support `_Float128`.
+                    Arch::AArch64
+                        if !tcx.sess.target.is_like_darwin && !tcx.sess.target.is_like_windows =>
+                    {
+                        "e"
+                    }
+                    Arch::RiscV32 | Arch::RiscV64 | Arch::LoongArch64 => "e",
                     _ => "g",
                 },
             });
diff --git a/tests/codegen-llvm/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-f128.rs b/tests/codegen-llvm/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-f128.rs
new file mode 100644
index 0000000000000..459acab99ed8b
--- /dev/null
+++ b/tests/codegen-llvm/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-f128.rs
@@ -0,0 +1,31 @@
+// Verifies `f128` maps to `long double` (code `e`) where that's 128-bit
+// (aarch64 Linux) and to `_Float128` (code `g`) elsewhere (x86_64, and aarch64
+// Apple where `long double` is 64-bit).
+//
+//@ add-minicore
+//@ needs-sanitizer-cfi
+//@ revisions: aarch64 x64 darwin loongarch64
+//@ [aarch64] needs-llvm-components: aarch64
+//@ [aarch64] compile-flags: --target aarch64-unknown-linux-gnu
+//@ [x64] needs-llvm-components: x86
+//@ [x64] compile-flags: --target x86_64-unknown-linux-gnu
+//@ [darwin] needs-llvm-components: aarch64
+//@ [darwin] compile-flags: --target aarch64-apple-darwin
+//@ [loongarch64] needs-llvm-components: loongarch
+//@ [loongarch64] compile-flags: --target loongarch64-unknown-linux-gnu
+//@ compile-flags: -Cno-prepopulate-passes -Copt-level=0 -C link-dead-code
+//@ compile-flags: -Clto -Zsanitizer=cfi -Ctarget-feature=-crt-static -C unsafe-allow-abi-mismatch=sanitizer
+//@ minicore-compile-flags: -Ccodegen-units=1
+
+#![crate_type = "lib"]
+#![feature(no_core, f16, f128)]
+#![no_core]
+
+extern crate minicore;
+use minicore::*;
+
+pub fn foo(_: f128) {}
+// aarch64: !{i64 0, !"_ZTSFveE"}
+// x64: !{i64 0, !"_ZTSFvgE"}
+// darwin: !{i64 0, !"_ZTSFvgE"}
+// loongarch64: !{i64 0, !"_ZTSFveE"}
diff --git a/tests/codegen-llvm/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-primitive-types.rs b/tests/codegen-llvm/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-primitive-types.rs
index 59e794df69990..959a7ae9e8b25 100644
--- a/tests/codegen-llvm/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-primitive-types.rs
+++ b/tests/codegen-llvm/sanitizer/cfi/emit-type-metadata-id-itanium-cxx-abi-primitive-types.rs
@@ -3,6 +3,15 @@
 //
 //@ add-minicore
 //@ needs-sanitizer-cfi
+//@ revisions: aarch64 x64 darwin loongarch64
+//@ [aarch64] needs-llvm-components: aarch64
+//@ [aarch64] compile-flags: --target aarch64-unknown-linux-gnu
+//@ [x64] needs-llvm-components: x86
+//@ [x64] compile-flags: --target x86_64-unknown-linux-gnu
+//@ [darwin] needs-llvm-components: aarch64
+//@ [darwin] compile-flags: --target aarch64-apple-darwin
+//@ [loongarch64] needs-llvm-components: loongarch
+//@ [loongarch64] compile-flags: --target loongarch64-unknown-linux-gnu
 //@ compile-flags: -Cno-prepopulate-passes -Copt-level=0 -C link-dead-code
 //@ compile-flags: -Clto -Zsanitizer=cfi -Ctarget-feature=-crt-static -C unsafe-allow-abi-mismatch=sanitizer
 //@ minicore-compile-flags: -Ccodegen-units=1
@@ -229,6 +238,15 @@ pub fn foo66(_: f128, _: f128, _: f128) {}
 // CHECK: ![[TYPE61]] = !{i64 0, !"_ZTSFvDhE"}
 // CHECK: ![[TYPE62]] = !{i64 0, !"_ZTSFvDhDhE"}
 // CHECK: ![[TYPE63]] = !{i64 0, !"_ZTSFvDhDhDhE"}
-// CHECK: ![[TYPE64]] = !{i64 0, !"_ZTSFvgE"}
-// CHECK: ![[TYPE65]] = !{i64 0, !"_ZTSFvggE"}
-// CHECK: ![[TYPE66]] = !{i64 0, !"_ZTSFvgggE"}
+// aarch64: ![[TYPE64]] = !{i64 0, !"_ZTSFveE"}
+// x64: ![[TYPE64]] = !{i64 0, !"_ZTSFvgE"}
+// darwin: ![[TYPE64]] = !{i64 0, !"_ZTSFvgE"}
+// loongarch64: ![[TYPE64]] = !{i64 0, !"_ZTSFveE"}
+// aarch64: ![[TYPE65]] = !{i64 0, !"_ZTSFveeE"}
+// x64: ![[TYPE65]] = !{i64 0, !"_ZTSFvggE"}
+// darwin: ![[TYPE65]] = !{i64 0, !"_ZTSFvggE"}
+// loongarch64: ![[TYPE65]] = !{i64 0, !"_ZTSFveeE"}
+// aarch64: ![[TYPE66]] = !{i64 0, !"_ZTSFveeeE"}
+// x64: ![[TYPE66]] = !{i64 0, !"_ZTSFvgggE"}
+// darwin: ![[TYPE66]] = !{i64 0, !"_ZTSFvgggE"}
+// loongarch64: ![[TYPE66]] = !{i64 0, !"_ZTSFveeeE"}