cranelift: Rework pinned register lowering (#5249)

Rework pinned register lowering to avoid the use of pinned virtual registers, instead using the MovFromPReg and MovToPReg pseudo instructions.
2022-11-10 16:19:25 -08:00
parent 7717d8fa55
commit 0367fbc2d4
14 changed files with 150 additions and 71 deletions
--- a/cranelift/codegen/src/isa/aarch64/lower.isle
+++ b/cranelift/codegen/src/isa/aarch64/lower.isle
@@ -2189,7 +2189,7 @@
 ;;; Rules for `{get,set}_pinned_reg` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

 (rule (lower (get_pinned_reg))
-      (pinned_reg))
+      (mov_from_preg (preg_pinned)))

 (rule (lower (set_pinned_reg val))
      (side_effect (write_pinned_reg val)))