x64: port atomic_cas to ISLE (#4223)

2022-06-06 13:20:33 -07:00
parent d8ba1ddc86
commit 6df56e6aa6
4 changed files with 23 additions and 26 deletions
--- a/cranelift/codegen/src/isa/x64/lower.isle
+++ b/cranelift/codegen/src/isa/x64/lower.isle
@@ -2812,3 +2812,9 @@
      (side_effect (side_effect_concat
       (x64_movrm ty (to_amode flags address (zero_offset)) value)
       (x64_mfence))))
+
+;; Rules for `atomic_cas` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(rule (lower (has_type (and (fits_in_64 ty) (ty_int _))
+                  (atomic_cas flags address expected replacement)))
+      (x64_cmpxchg ty expected replacement (to_amode flags address (zero_offset))))