Constant-fold icmp instructions (#5666)

We found examples of icmp instructions with both operands constant in spidermonkey.wasm.
2023-02-01 13:55:36 -08:00
parent bdfb746548
commit ac4d28f4dd
5 changed files with 161 additions and 18 deletions
--- a/cranelift/filetests/filetests/egraph/algebraic.clif
+++ b/cranelift/filetests/filetests/egraph/algebraic.clif
@@ -192,3 +192,21 @@ block0(v0: i64):
    return v4
    ; check: return v4
 }
+
+function %f2(i8) -> i8 {
+block0(v1: i8):
+    v2 = icmp eq v1, v1
+    return v2
+}
+
+; check: v3 = iconst.i8 1
+; check: return v3
+
+function %f3(i8) -> i8 {
+block0(v1: i8):
+    v2 = icmp ne v1, v1
+    return v2
+}
+
+; check: v3 = iconst.i8 0
+; check: return v3