T0b1/wasmtime
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

cranelift: simplify ineg(ineg(x)) to x (#6033)

Browse Source
This commit is contained in:
Karl Meakin
2023-03-16 22:14:05 +00:00
committed by GitHub
parent 07136ae96d
commit dccc2d6269
2 changed files with 11 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
cranelift/codegen/src/opts/algebraic.isle
View File

@@ -32,6 +32,9 @@
x)) x))
(ineg ty x)) (ineg ty x))
;; ineg(ineg(x)) == x.
(rule (simplify (ineg ty (ineg ty x))) (subsume x))
;; x*1 == 1*x == x. ;; x*1 == 1*x == x.
(rule (simplify (imul ty (rule (simplify (imul ty
x x

8
cranelift/filetests/filetests/egraph/algebraic.clif
View File

@@ -224,6 +224,14 @@ block0(v0: i8):
; check: return v5 ; check: return v5
} }
function %double_ineg(i32) -> i32 {
block0(v0: i32):
v1 = ineg v0
v2 = ineg v1
return v2
; check: return v0
}
function %or_and_y_with_not_y_i8(i8, i8) -> i8 { function %or_and_y_with_not_y_i8(i8, i8) -> i8 {
block0(v0: i8, v1: i8): block0(v0: i8, v1: i8):
v2 = band v0, v1 v2 = band v0, v1