https://git.ruby-lang.org/ruby.git/commit/?id=e85e0e2fa9

From e85e0e2fa98d7835163e3470ca322b11a0f67c67 Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@s...>
Date: Wed, 3 Feb 2021 16:09:03 -0500
Subject: Commit WIP setlocal_WC_1 implementation

---
 ujit_codegen.c | 34 +++++++++++++++++++++++++++++++---
 1 file changed, 31 insertions(+), 3 deletions(-)

diff --git a/ujit_codegen.c b/ujit_codegen.c
index 3b66e8fa40..ad5d1b18b0 100644
--- a/ujit_codegen.c
+++ b/ujit_codegen.c
@@ -339,7 +339,7 @@ gen_getlocal_wc0(jitstate_t* jit, ctx_t* ctx) https://github.com/ruby/ruby/blob/trunk/ujit_codegen.c#L339
 
     // Compute the offset from BP to the local
     int32_t local_idx = (int32_t)jit_get_arg(jit, 0);
-    const int32_t offs = -sizeof(VALUE) * local_idx;
+    const int32_t offs = -(SIZEOF_VALUE * local_idx);
 
     // Load the local from the block
     mov(cb, REG0, mem_opnd(64, REG0, offs));
@@ -351,6 +351,33 @@ gen_getlocal_wc0(jitstate_t* jit, ctx_t* ctx) https://github.com/ruby/ruby/blob/trunk/ujit_codegen.c#L351
     return true;
 }
 
+static bool
+gen_getlocal_wc1(jitstate_t* jit, ctx_t* ctx)
+{
+    //fprintf(stderr, "gen_getlocal_wc1\n");
+
+    // Load environment pointer EP from CFP
+    mov(cb, REG0, member_opnd(REG_CFP, rb_control_frame_t, ep));
+
+    // Get the previous EP from the current EP
+    // See GET_PREV_EP(ep) macro
+    // VALUE* prev_ep = ((VALUE *)((ep)[VM_ENV_DATA_INDEX_SPECVAL] & ~0x03))
+    mov(cb, REG0, mem_opnd(64, REG0, SIZEOF_VALUE * VM_ENV_DATA_INDEX_SPECVAL));
+    and(cb, REG0, imm_opnd(~0x03));
+
+    // Load the local from the block
+    // val = *(vm_get_ep(GET_EP(), level) - idx);
+    int32_t local_idx = (int32_t)jit_get_arg(jit, 0);
+    const int32_t offs = -(SIZEOF_VALUE * local_idx);
+    mov(cb, REG0, mem_opnd(64, REG0, offs));
+
+    // Write the local at SP
+    x86opnd_t stack_top = ctx_stack_push(ctx, T_NONE);
+    mov(cb, stack_top, REG0);
+
+    return true;
+}
+
 static bool
 gen_setlocal_wc0(jitstate_t* jit, ctx_t* ctx)
 {
@@ -1186,9 +1213,9 @@ gen_opt_swb_iseq(jitstate_t* jit, ctx_t* ctx, struct rb_call_data * cd, const rb https://github.com/ruby/ruby/blob/trunk/ujit_codegen.c#L1213
 
     // Setup the new frame
     // *cfp = (const struct rb_control_frame_struct) {
-    //    .pc         = 0,
+    //    .pc         = pc,
     //    .sp         = sp,
-    //    .iseq       = 0,
+    //    .iseq       = iseq,
     //    .self       = recv,
     //    .ep         = sp - 1,
     //    .block_code = 0,
@@ -1348,6 +1375,7 @@ ujit_init_codegen(void) https://github.com/ruby/ruby/blob/trunk/ujit_codegen.c#L1375
     ujit_reg_op(BIN(putobject_INT2FIX_1_), gen_putobject_int2fix, false);
     ujit_reg_op(BIN(putself), gen_putself, false);
     ujit_reg_op(BIN(getlocal_WC_0), gen_getlocal_wc0, false);
+    //ujit_reg_op(BIN(getlocal_WC_1), gen_getlocal_wc1, false);
     ujit_reg_op(BIN(setlocal_WC_0), gen_setlocal_wc0, false);
     ujit_reg_op(BIN(getinstancevariable), gen_getinstancevariable, false);
     ujit_reg_op(BIN(setinstancevariable), gen_setinstancevariable, false);
-- 
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