diff --git a/cranelift/filetests/filetests/runtests/fdemote.clif b/cranelift/filetests/filetests/runtests/fdemote.clif
index b23bcf1e40c9..240f9978f475 100644
--- a/cranelift/filetests/filetests/runtests/fdemote.clif
+++ b/cranelift/filetests/filetests/runtests/fdemote.clif
@@ -68,3 +68,21 @@ block0(v0: f64):
 ; run: %fdemote_is_nan(-sNaN:0x1) == 1
 ; run: %fdemote_is_nan(+sNaN:0x4000000000001) == 1
 ; run: %fdemote_is_nan(-sNaN:0x4000000000001) == 1
+
+
+;; Tests a fdemote+load combo which some backends may optimize
+function %fdemote_load(i64, f64) -> f32 {
+    ss0 = explicit_slot 16
+
+block0(v1: i64, v2: f64):
+    v3 = stack_addr.i64 ss0
+    store.f64 v2, v3
+    v4 = load.f64 v3
+    v5 = fdemote.f32 v4
+    return v5
+}
+; run: %fdemote_load(0, 0x0.0) == 0x0.0
+; run: %fdemote_load(1, 0x0.1) == 0x0.1
+; run: %fdemote_load(2, 0x0.2) == 0x0.2
+; run: %fdemote_load(3, 0x3.2) == 0x3.2
+; run: %fdemote_load(0x8, 0x3.2) == 0x3.2
diff --git a/cranelift/filetests/filetests/runtests/fpromote.clif b/cranelift/filetests/filetests/runtests/fpromote.clif
index 1603c1c5b170..941cb733e0d7 100644
--- a/cranelift/filetests/filetests/runtests/fpromote.clif
+++ b/cranelift/filetests/filetests/runtests/fpromote.clif
@@ -76,3 +76,21 @@ block0(v0: f32):
 ; run: %fpromote_is_nan(-sNaN:0x1) == 1
 ; run: %fpromote_is_nan(+sNaN:0x200001) == 1
 ; run: %fpromote_is_nan(-sNaN:0x200001) == 1
+
+
+;; Tests a fpromote+load combo which some backends may optimize
+function %fpromote_load(i64, f32) -> f64 {
+    ss0 = explicit_slot 16
+
+block0(v1: i64, v2: f32):
+    v3 = stack_addr.i64 ss0
+    store.f32 v2, v3
+    v4 = load.f32 v3
+    v5 = fpromote.f64 v4
+    return v5
+}
+; run: %fpromote_load(0, 0x0.0) == 0x0.0
+; run: %fpromote_load(1, 0x0.1) == 0x0.1
+; run: %fpromote_load(2, 0x0.2) == 0x0.2
+; run: %fpromote_load(3, 0x3.2) == 0x3.2
+; run: %fpromote_load(0xC, 0x3.2) == 0x3.2