cranelift: simplify fneg(fneg(x)) to x (#6034)

2023-03-16 22:14:12 +00:00
parent dccc2d6269
commit d479951469
2 changed files with 12 additions and 0 deletions
--- a/cranelift/filetests/filetests/egraph/algebraic.clif
+++ b/cranelift/filetests/filetests/egraph/algebraic.clif
@@ -492,6 +492,15 @@ block0(v1: i16):
 ; check: v4 = sextend.i64 v1
 ; check: return v4

+function %double_fneg(f32) -> f32 {
+block0(v1: f32):
+    v2 = fneg v1
+    v3 = fneg v2
+    return v3
+}
+
+; check: return v1
+
 function %fma_double_fneg(f32, f32, f32) -> f32 {
 block0(v1: f32, v2: f32, v3: f32):
    v4 = fneg v1