diff --git a/lib/std/target.zig b/lib/std/target.zig
index 99a137b4b9..7121c1c3e2 100644
--- a/lib/std/target.zig
+++ b/lib/std/target.zig
@@ -1780,92 +1780,6 @@ pub const Target = struct {
         };
     }
 
-    pub inline fn longDoubleIs(target: Target, comptime F: type) bool {
-        switch (target.os.tag) {
-            .windows, .uefi => switch (target.abi) {
-                .gnu, .gnuilp32, .cygnus => switch (target.cpu.arch) {
-                    .i386 => return F == f80,
-                    .x86_64 => return F == f128,
-                    else => return F == f64,
-                },
-                else => return F == f64,
-            },
-            else => {},
-        }
-
-        if (target.abi == .android and target.cpu.arch == .i386)
-            return F == f64;
-
-        switch (target.cpu.arch) {
-            .aarch64,
-            .aarch64_be,
-            .aarch64_32,
-            => switch (target.os.tag) {
-                // According to Apple's official guide:
-                // > The long double type is a double precision IEEE754 binary floating-point type,
-                // > which makes it identical to the double type. This behavior contrasts to the
-                // > standard specification, in which a long double is a quad-precision, IEEE754
-                // > binary, floating-point type.
-                // https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms
-                .ios, .macos, .watchos, .tvos => return F == f64,
-                .windows, .uefi => return F == f64,
-                else => return F == f128,
-            },
-
-            .i386 => return F == f80,
-            .x86_64 => return F == f80,
-
-            .mips64,
-            .mips64el,
-            => switch (target.os.tag) {
-                .freebsd => return F == f64,
-                else => return F == f128,
-            },
-
-            .powerpc,
-            .powerpcle,
-            => switch (target.abi) {
-                .musl,
-                .musleabi,
-                .musleabihf,
-                .muslx32,
-                => return F == f64,
-                else => switch (target.os.tag) {
-                    .freebsd, .netbsd, .openbsd => return F == f64,
-                    else => return F == f128,
-                },
-            },
-
-            .powerpc64,
-            .powerpc64le,
-            => switch (target.abi) {
-                .musl,
-                .musleabi,
-                .musleabihf,
-                .muslx32,
-                => return F == f64,
-                else => switch (target.os.tag) {
-                    .freebsd, .openbsd => return F == f64,
-                    else => return F == f128,
-                },
-            },
-
-            .riscv32,
-            .riscv64,
-            .s390x,
-            .sparc,
-            .sparc64,
-            .sparcel,
-            .wasm32,
-            .wasm64,
-            => return F == f128,
-
-            .avr, .tce, .tcele => return F == f32,
-
-            else => return F == f64,
-        }
-    }
-
     pub inline fn maxIntAlignment(target: Target) u16 {
         return switch (target.cpu.arch) {
             .avr => 1,
diff --git a/src/codegen/llvm.zig b/src/codegen/llvm.zig
index b0d1588007..68e969f9e7 100644
--- a/src/codegen/llvm.zig
+++ b/src/codegen/llvm.zig
@@ -10615,8 +10615,8 @@ fn backendSupportsF128(target: std.Target) bool {
 fn intrinsicsAllowed(scalar_ty: Type, target: std.Target) bool {
     return switch (scalar_ty.tag()) {
         .f16 => backendSupportsF16(target),
-        .f80 => target.longDoubleIs(f80) and backendSupportsF80(target),
-        .f128 => target.longDoubleIs(f128) and backendSupportsF128(target),
+        .f80 => (CType.longdouble.sizeInBits(target) == 80) and backendSupportsF80(target),
+        .f128 => (CType.longdouble.sizeInBits(target) == 128) and backendSupportsF128(target),
         else => true,
     };
 }