[Qemu-devel] [5287] Avoid clobbering input register in qemu_ld64+bswap+useronly case

[malc]

Revision: 5287
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5287
Author:   malc
Date:     2008-09-22 01:08:08 +0000 (Mon, 22 Sep 2008)

Log Message:
-----------
Avoid clobbering input register in qemu_ld64+bswap+useronly case

Modified Paths:
--------------
    trunk/tcg/ppc/tcg-target.c

Modified: trunk/tcg/ppc/tcg-target.c
===================================================================
--- trunk/tcg/ppc/tcg-target.c  2008-09-22 00:52:42 UTC (rev 5286)
+++ trunk/tcg/ppc/tcg-target.c  2008-09-22 01:08:08 UTC (rev 5287)
@@ -474,9 +474,9 @@
 
 static void tcg_out_qemu_ld (TCGContext *s, const TCGArg *args, int opc)
 {
-    int addr_reg, data_reg, data_reg2, r0, mem_index, s_bits, bswap;
+    int addr_reg, data_reg, data_reg2, r0, r1, mem_index, s_bits, bswap;
 #ifdef CONFIG_SOFTMMU
-    int r1, r2;
+    int r2;
     void *label1_ptr, *label2_ptr;
 #endif
 #if TARGET_LONG_BITS == 64
@@ -599,6 +599,7 @@
 
 #else  /* !CONFIG_SOFTMMU */
     r0 = addr_reg;
+    r1 = 3;
 #endif
 
 #ifdef TARGET_WORDS_BIGENDIAN
@@ -632,17 +633,9 @@
         break;
     case 3:
         if (bswap) {
-            if (r0 == data_reg) {
-                tcg_out32 (s, LWBRX | RT (0) | RB (r0));
-                tcg_out32 (s, ADDI | RT (r0) | RA (r0) |  4);
-                tcg_out32 (s, LWBRX | RT (data_reg2) | RB (r0));
-                tcg_out_mov (s, data_reg, 0);
-            }
-            else {
-                tcg_out32 (s, LWBRX | RT (data_reg) | RB (r0));
-                tcg_out32 (s, ADDI | RT (r0) | RA (r0) |  4);
-                tcg_out32 (s, LWBRX | RT (data_reg2) | RB (r0));
-            }
+            tcg_out32 (s, ADDI | RT (r1) | RA (r0) |  4);
+            tcg_out32 (s, LWBRX | RT (data_reg) | RB (r0));
+            tcg_out32 (s, LWBRX | RT (data_reg2) | RB (r1));
         }
         else {
             if (r0 == data_reg2) {