diff --git a/tests/assembly/x86-return-float.rs b/tests/assembly/x86-return-float.rs
index 270aea2475f..c4a2c1ad44e 100644
--- a/tests/assembly/x86-return-float.rs
+++ b/tests/assembly/x86-return-float.rs
@@ -1,5 +1,10 @@
 //@ assembly-output: emit-asm
 //@ only-x86
+// FIXME(#114479): LLVM miscompiles loading and storing `f32` and `f64` when SSE is disabled.
+// There's no compiletest directive to ignore a test on i586 only, so just always explicitly enable
+// SSE2.
+// Use the same target CPU as `i686` so that LLVM orders the instructions in the same order.
+//@ compile-flags: -Ctarget-feature=+sse2 -Ctarget-cpu=pentium4
 // Force frame pointers to make ASM more consistent between targets
 //@ compile-flags: -O -C force-frame-pointers
 //@ filecheck-flags: --implicit-check-not fld --implicit-check-not fst
diff --git a/tests/ui/abi/numbers-arithmetic/return-float.rs b/tests/ui/abi/numbers-arithmetic/return-float.rs
index 3b025b763f1..66a6d66911d 100644
--- a/tests/ui/abi/numbers-arithmetic/return-float.rs
+++ b/tests/ui/abi/numbers-arithmetic/return-float.rs
@@ -4,50 +4,54 @@
 // Test that floats (in particular signalling NaNs) are losslessly returned from functions.
 
 fn main() {
-    let bits_f32 = std::hint::black_box([
-        4.2_f32.to_bits(),
-        f32::INFINITY.to_bits(),
-        f32::NEG_INFINITY.to_bits(),
-        f32::NAN.to_bits(),
-        // These two masks cover all the mantissa bits. One of them is a signalling NaN, the other
-        // is quiet.
-        // Similar to the masks in `test_float_bits_conv` in library/std/src/f32/tests.rs
-        f32::NAN.to_bits() ^ 0x002A_AAAA,
-        f32::NAN.to_bits() ^ 0x0055_5555,
-        // Same as above but with the sign bit flipped.
-        f32::NAN.to_bits() ^ 0x802A_AAAA,
-        f32::NAN.to_bits() ^ 0x8055_5555,
-    ]);
-    for bits in bits_f32 {
-        assert_eq!(identity(f32::from_bits(bits)).to_bits(), bits);
-        // Test types that are returned as scalar pairs.
-        assert_eq!(identity((f32::from_bits(bits), 42)).0.to_bits(), bits);
-        assert_eq!(identity((42, f32::from_bits(bits))).1.to_bits(), bits);
-        let (a, b) = identity((f32::from_bits(bits), f32::from_bits(bits)));
-        assert_eq!((a.to_bits(), b.to_bits()), (bits, bits));
-    }
+    // FIXME(#114479): LLVM miscompiles loading and storing `f32` and `f64` when SSE is disabled on
+    // x86.
+    if cfg!(not(all(target_arch = "x86", not(target_feature = "sse2")))) {
+        let bits_f32 = std::hint::black_box([
+            4.2_f32.to_bits(),
+            f32::INFINITY.to_bits(),
+            f32::NEG_INFINITY.to_bits(),
+            f32::NAN.to_bits(),
+            // These two masks cover all the mantissa bits. One of them is a signalling NaN, the
+            // other is quiet.
+            // Similar to the masks in `test_float_bits_conv` in library/std/src/f32/tests.rs
+            f32::NAN.to_bits() ^ 0x002A_AAAA,
+            f32::NAN.to_bits() ^ 0x0055_5555,
+            // Same as above but with the sign bit flipped.
+            f32::NAN.to_bits() ^ 0x802A_AAAA,
+            f32::NAN.to_bits() ^ 0x8055_5555,
+        ]);
+        for bits in bits_f32 {
+            assert_eq!(identity(f32::from_bits(bits)).to_bits(), bits);
+            // Test types that are returned as scalar pairs.
+            assert_eq!(identity((f32::from_bits(bits), 42)).0.to_bits(), bits);
+            assert_eq!(identity((42, f32::from_bits(bits))).1.to_bits(), bits);
+            let (a, b) = identity((f32::from_bits(bits), f32::from_bits(bits)));
+            assert_eq!((a.to_bits(), b.to_bits()), (bits, bits));
+        }
 
-    let bits_f64 = std::hint::black_box([
-        4.2_f64.to_bits(),
-        f64::INFINITY.to_bits(),
-        f64::NEG_INFINITY.to_bits(),
-        f64::NAN.to_bits(),
-        // These two masks cover all the mantissa bits. One of them is a signalling NaN, the other
-        // is quiet.
-        // Similar to the masks in `test_float_bits_conv` in library/std/src/f64/tests.rs
-        f64::NAN.to_bits() ^ 0x000A_AAAA_AAAA_AAAA,
-        f64::NAN.to_bits() ^ 0x0005_5555_5555_5555,
-        // Same as above but with the sign bit flipped.
-        f64::NAN.to_bits() ^ 0x800A_AAAA_AAAA_AAAA,
-        f64::NAN.to_bits() ^ 0x8005_5555_5555_5555,
-    ]);
-    for bits in bits_f64 {
-        assert_eq!(identity(f64::from_bits(bits)).to_bits(), bits);
-        // Test types that are returned as scalar pairs.
-        assert_eq!(identity((f64::from_bits(bits), 42)).0.to_bits(), bits);
-        assert_eq!(identity((42, f64::from_bits(bits))).1.to_bits(), bits);
-        let (a, b) = identity((f64::from_bits(bits), f64::from_bits(bits)));
-        assert_eq!((a.to_bits(), b.to_bits()), (bits, bits));
+        let bits_f64 = std::hint::black_box([
+            4.2_f64.to_bits(),
+            f64::INFINITY.to_bits(),
+            f64::NEG_INFINITY.to_bits(),
+            f64::NAN.to_bits(),
+            // These two masks cover all the mantissa bits. One of them is a signalling NaN, the
+            // other is quiet.
+            // Similar to the masks in `test_float_bits_conv` in library/std/src/f64/tests.rs
+            f64::NAN.to_bits() ^ 0x000A_AAAA_AAAA_AAAA,
+            f64::NAN.to_bits() ^ 0x0005_5555_5555_5555,
+            // Same as above but with the sign bit flipped.
+            f64::NAN.to_bits() ^ 0x800A_AAAA_AAAA_AAAA,
+            f64::NAN.to_bits() ^ 0x8005_5555_5555_5555,
+        ]);
+        for bits in bits_f64 {
+            assert_eq!(identity(f64::from_bits(bits)).to_bits(), bits);
+            // Test types that are returned as scalar pairs.
+            assert_eq!(identity((f64::from_bits(bits), 42)).0.to_bits(), bits);
+            assert_eq!(identity((42, f64::from_bits(bits))).1.to_bits(), bits);
+            let (a, b) = identity((f64::from_bits(bits), f64::from_bits(bits)));
+            assert_eq!((a.to_bits(), b.to_bits()), (bits, bits));
+        }
     }
 }