Mark the jump_table_entry Instruction as loading;

2019-06-26 17:10:20 +02:00
parent 079ccf1f6e
commit 83336290c2
3 changed files with 32 additions and 2 deletions
--- a/cranelift/filetests/filetests/licm/jump-table-entry.clif
+++ b/cranelift/filetests/filetests/licm/jump-table-entry.clif
@@ -0,0 +1,29 @@
+test licm
+
+target x86_64
+
+function %dont_hoist_jump_table_entry_during_licm() {
+    jt0 = jump_table [ebb1, ebb1]
+
+ebb0:
+    fallthrough ebb1
+
+ebb1: ; the loop!
+    v2 = iconst.i32 42
+    v3 = ifcmp_imm v2, 0
+    brif uge v3, ebb1
+    fallthrough ebb2
+
+ebb2:
+    v1 = iconst.i32 -14
+    v8 = ifcmp_imm v1, 2
+    brif uge v8, ebb1
+    v5 = jump_table_base.i64 jt0
+    v6 = jump_table_entry.i64 v1, v5, 4, jt0
+    v7 = iadd v5, v6
+    indirect_jump_table_br v7, jt0
+; check: ebb2:
+; nextln: v8 = ifcmp_imm.i32 v1, 2
+; nextln: brif uge v8, ebb1
+; nextln: jump_table_entry.i64
+}