[Qemu-devel] [5033] Avoid clobbering input/ aliased registers in !SOFTMMU+64bit+bswap case

[malc]

Revision: 5033
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5033
Author:   malc
Date:     2008-08-20 22:39:19 +0000 (Wed, 20 Aug 2008)

Log Message:
-----------
Avoid clobbering input/aliased registers in !SOFTMMU+64bit+bswap case

Modified Paths:
--------------
    trunk/tcg/ppc64/tcg-target.c

Modified: trunk/tcg/ppc64/tcg-target.c
===================================================================
--- trunk/tcg/ppc64/tcg-target.c        2008-08-20 22:39:17 UTC (rev 5032)
+++ trunk/tcg/ppc64/tcg-target.c        2008-08-20 22:39:19 UTC (rev 5033)
@@ -579,9 +579,9 @@
 
 static void tcg_out_qemu_ld (TCGContext *s, const TCGArg *args, int opc)
 {
-    int addr_reg, data_reg, r0, mem_index, s_bits, bswap;
+    int addr_reg, data_reg, r0, r1, mem_index, s_bits, bswap;
 #ifdef CONFIG_SOFTMMU
-    int r1, r2;
+    int r2;
     void *label1_ptr, *label2_ptr;
 #endif
 
@@ -653,6 +653,7 @@
     tcg_out_rld (s, RLDICL, addr_reg, addr_reg, 0, 32);
 #endif
     r0 = addr_reg;
+    r1 = 4;
 #endif
 
 #ifdef TARGET_WORDS_BIGENDIAN
@@ -693,11 +694,11 @@
         break;
     case 3:
         if (bswap) {
-            tcg_out32 (s, LWBRX | RT (data_reg) | RB (r0));
-            tcg_out32 (s, ADDI | RT (r0) | RA (r0) | 4);
-            tcg_out32 (s, LWBRX | RT (r0) | RB (r0));
-            tcg_out_rld (s, RLDICR, r0, r0, 32, 31);
-            tcg_out32 (s, OR | SAB (r0, data_reg, data_reg));
+            tcg_out32 (s, LWBRX | RT (0) | RB (r0));
+            tcg_out32 (s, ADDI | RT (r1) | RA (r0) | 4);
+            tcg_out32 (s, LWBRX | RT (data_reg) | RB (r1));
+            tcg_out_rld (s, RLDICR, data_reg, data_reg, 32, 31);
+            tcg_out32 (s, OR | SAB (0, data_reg, data_reg));
         }
         else tcg_out32 (s, LD | RT (data_reg) | RA (r0));
         break;
@@ -788,9 +789,9 @@
     case 3:
         if (bswap) {
             tcg_out32 (s, STWBRX | RS (data_reg) | RA (0) | RB (r0));
-            tcg_out32 (s, ADDI | RT (r0) | RA (r0) | 4);
+            tcg_out32 (s, ADDI | RT (r1) | RA (r0) | 4);
             tcg_out_rld (s, RLDICL, 0, data_reg, 32, 0);
-            tcg_out32 (s, STWBRX | RS (0) | RA (0) | RB (r0));
+            tcg_out32 (s, STWBRX | RS (0) | RA (0) | RB (r1));
         }
         else tcg_out32 (s, STD | RS (data_reg) | RA (r0));
         break;