From c0620c8a00f760765da802dc11e4863193e357e8 Mon Sep 17 00:00:00 2001
From: bobbl <bobbl@gmx.de>
Date: Mon, 30 Nov 2009 19:33:44 +0100
Subject: [PATCH] avoid needless register save when storing structures

When storing structs with a memcpy call in vstore(),
so far a needless entry remaining on the vstack
sometimes resulted in an useless store generated by
save_regs() in gfunc_call() for the memcpy routine.
---
 tccgen.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/tccgen.c b/tccgen.c
index 78a5161f..38b0912a 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -2019,6 +2019,12 @@ void vstore(void)
         if (!nocode_wanted) {
             size = type_size(&vtop->type, &align);
 
+            /* destination */
+            vswap();
+            vtop->type.t = VT_PTR;
+            gaddrof();
+
+            /* address of memcpy() */
 #ifdef TCC_ARM_EABI
             if(!(align & 7))
                 vpush_global_sym(&func_old_type, TOK_memcpy8);
@@ -2028,10 +2034,7 @@ void vstore(void)
 #endif
             vpush_global_sym(&func_old_type, TOK_memcpy);
 
-            /* destination */
-            vpushv(vtop - 2);
-            vtop->type.t = VT_PTR;
-            gaddrof();
+            vswap();
             /* source */
             vpushv(vtop - 2);
             vtop->type.t = VT_PTR;
@@ -2039,9 +2042,6 @@ void vstore(void)
             /* type size */
             vpushi(size);
             gfunc_call(3);
-            
-            vswap();
-            vpop();
         } else {
             vswap();
             vpop();
-- 
2.11.4.GIT