From aa808204bb3b84ad37e2c4722f9d00e07ab8f281 Mon Sep 17 00:00:00 2001
From: Jeremy Evans <code@jeremyevans.net>
Date: Mon, 6 Nov 2023 13:17:49 -0800
Subject: [PATCH] Eliminate array allocation for f(*a, kw: 1, &lvar) and f(*a,
 kw: 1, &@iv)

Similar to the previous commit, but this handles the block pass
case.
---
 compile.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/compile.c b/compile.c
index f6236ebcc5..27f64febe8 100644
--- a/compile.c
+++ b/compile.c
@@ -3940,6 +3940,32 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
                     OPERAND_AT(iobj, 0) = Qfalse;
                 }
             }
+            else if (IS_NEXT_INSN_ID(niobj, getlocal) || IS_NEXT_INSN_ID(niobj, getinstancevariable)) {
+                niobj = niobj->next;
+
+                /*
+                * Eliminate array allocation for f(*a, kw: 1, &lvar) and f(*a, kw: 1, &@iv)
+                *
+                *  splatarray true
+                *  duphash
+                *  getlocal / getinstancevariable
+                *  send ARGS_SPLAT|KW_SPLAT|KW_SPLAT_MUT|ARGS_BLOCKARG
+                * =>
+                *  splatarray false
+                *  duphash
+                *  getlocal / getinstancevariable
+                *  send
+                */
+                if (IS_NEXT_INSN_ID(niobj, send)) {
+                    niobj = niobj->next;
+                    unsigned int flag = vm_ci_flag((const struct rb_callinfo *)OPERAND_AT(niobj, 0));
+
+                    if ((flag & VM_CALL_ARGS_SPLAT) && (flag & VM_CALL_KW_SPLAT) &&
+                            (flag & VM_CALL_KW_SPLAT_MUT) && (flag & VM_CALL_ARGS_BLOCKARG)) {
+                        OPERAND_AT(iobj, 0) = Qfalse;
+                    }
+                }
+            }
         }
     }