[Qemu-devel] [PATCH] Fix qemu_ld64 on arm

[Pablo Virolainen]

Emulating fldl on arm doesn't seem to work too well. It's the way 
qemu_ld64 is translated to arm instructions.

        tcg_out_ld32_12(s, COND_AL, data_reg, addr_reg, 0);
        tcg_out_ld32_12(s, COND_AL, data_reg2, addr_reg, 4);


Consider case where data_reg==0, data_reg2==1, and addr_reg==0. First 
load overwrited addr_reg. So let's put an if (data_ref==addr_reg).

Index: tcg-target.c
===================================================================
--- tcg-target.c        (revision 6642)
+++ tcg-target.c        (working copy)
@@ -1011,8 +1011,14 @@
     case 3:
         /* TODO: use block load -
          * check that data_reg2 > data_reg or the other way */
-        tcg_out_ld32_12(s, COND_AL, data_reg, addr_reg, 0);
-        tcg_out_ld32_12(s, COND_AL, data_reg2, addr_reg, 4);
+
+        if (data_reg==addr_reg) {
+            tcg_out_ld32_12(s, COND_AL, data_reg2, addr_reg, 4);
+            tcg_out_ld32_12(s, COND_AL, data_reg, addr_reg, 0);
+        } else {
+            tcg_out_ld32_12(s, COND_AL, data_reg, addr_reg, 0);
+            tcg_out_ld32_12(s, COND_AL, data_reg2, addr_reg, 4);
+        }
         break;
     }
 #endif