https://git.ruby-lang.org/ruby.git/commit/?id=f30f299060

From f30f2990601612af9378f1c33b1a1144986ba6f6 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@h...>
Date: Fri, 3 Sep 2021 22:15:17 -0700
Subject: Use C_ARG_REGS earlier

---
 yjit_codegen.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/yjit_codegen.c b/yjit_codegen.c
index 23d3a30d6e..fda8237d1c 100644
--- a/yjit_codegen.c
+++ b/yjit_codegen.c
@@ -2161,28 +2161,29 @@ gen_equality_specialized(jitstate_t* jit, ctx_t* ctx, uint8_t *side_exit) https://github.com/ruby/ruby/blob/trunk/yjit_codegen.c#L2161
             return YJIT_CANT_COMPILE;
         }
 
+        // Load a and b in preparation for call later
+        mov(cb, C_ARG_REGS[0], a_opnd);
+        mov(cb, C_ARG_REGS[1], b_opnd);
+
         // Guard that a is a String
-        mov(cb, REG0, a_opnd);
+        mov(cb, REG0, C_ARG_REGS[0]);
         jit_guard_known_klass(jit, ctx, rb_cString, OPND_STACK(1), comptime_a, SEND_MAX_DEPTH, side_exit);
 
         uint32_t ret = cb_new_label(cb, "ret");
 
         // If they are equal by identity, return true
-        mov(cb, REG0, b_opnd);
-        cmp(cb, REG0, a_opnd);
-        mov(cb, REG0, imm_opnd(Qtrue));
+        cmp(cb, C_ARG_REGS[0], C_ARG_REGS[1]);
+        mov(cb, RAX, imm_opnd(Qtrue));
         je_label(cb, ret);
 
         // Otherwise guard that b is a T_STRING (from type info) or String (from runtime guard)
         if (ctx_get_opnd_type(ctx, OPND_STACK(0)).type != ETYPE_STRING) {
-            mov(cb, REG0, b_opnd);
+            mov(cb, REG0, C_ARG_REGS[1]);
             // Note: any T_STRING is valid here, but we check for a ::String for simplicity
             jit_guard_known_klass(jit, ctx, rb_cString, OPND_STACK(0), comptime_b, SEND_MAX_DEPTH, side_exit);
         }
 
         // Call rb_str_eql_internal(a, b)
-        mov(cb, C_ARG_REGS[0], a_opnd);
-        mov(cb, C_ARG_REGS[1], b_opnd);
         call_ptr(cb, REG0, (void *)rb_str_eql_internal);
 
         // Push the output on the stack
-- 
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