cranelift: Port most of simple_preopt.rs over to the peepmatic DSL

This ports all of the identity, no-op, simplification, and canonicalization related optimizations over from being hand-coded to the `peepmatic` DSL. This does not handle the branch-to-branch optimizations or most of the divide-by-constant optimizations.
2020-04-28 16:43:32 -07:00
parent 18663fede9
commit 090d1c2d32
20 changed files with 1289 additions and 488 deletions
--- a/cranelift/filetests/filetests/isa/x86/isub_imm-i8.clif
+++ b/cranelift/filetests/filetests/isa/x86/isub_imm-i8.clif
@@ -6,9 +6,9 @@ function u0:0(i8) -> i8 fast {
 block0(v0: i8):
    v1 = iconst.i8 0
    v2 = isub v1, v0
-    ; check: v3 = uextend.i32 v0
-    ; nextln: v5 = iconst.i32 0
-    ; nextln = isub v5, v3
-    ; nextln = ireduce.i8 v4
+    ; check:  v4 = uextend.i32 v0
+    ; nextln: v6 = iconst.i32 0
+    ; nextln: v5 = isub v6, v4
+    ; nextln: v2 = ireduce.i8 v5
    return v2
 }