[Qemu-devel] [6307] target-mips: optimize some gpr accesses

[Aurelien Jarno]

Revision: 6307
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=6307
Author:   aurel32
Date:     2009-01-14 19:40:46 +0000 (Wed, 14 Jan 2009)

Log Message:
-----------
target-mips: optimize some gpr accesses

Optimize gpr accesses when it is known at translation time that gpr != 0.

Signed-off-by: Aurelien Jarno <address@hidden>

Modified Paths:
--------------
    trunk/target-mips/translate.c

Modified: trunk/target-mips/translate.c
===================================================================
--- trunk/target-mips/translate.c       2009-01-14 19:40:36 UTC (rev 6306)
+++ trunk/target-mips/translate.c       2009-01-14 19:40:46 UTC (rev 6307)
@@ -988,9 +988,8 @@
     } else if (offset == 0) {
         gen_load_gpr(t0, base);
     } else {
-        gen_load_gpr(t0, base);
-        tcg_gen_movi_tl(t1, offset);
-        gen_op_addr_add(ctx, t0, t1);
+        tcg_gen_movi_tl(t0, offset);
+        gen_op_addr_add(ctx, t0, cpu_gpr[base]);
     }
     /* Don't do NOP if destination is zero: we must perform the actual
        memory access. */
@@ -1151,12 +1150,8 @@
     } else if (offset == 0) {
         gen_load_gpr(t0, base);
     } else {
-        TCGv t1 = tcg_temp_local_new();
-
-        gen_load_gpr(t0, base);
-        tcg_gen_movi_tl(t1, offset);
-        gen_op_addr_add(ctx, t0, t1);
-        tcg_temp_free(t1);
+        tcg_gen_movi_tl(t0, offset);
+        gen_op_addr_add(ctx, t0, cpu_gpr[base]);
     }
     /* Don't do NOP if destination is zero: we must perform the actual
        memory access. */
@@ -7259,9 +7254,8 @@
     } else if (index == 0) {
         gen_load_gpr(t0, base);
     } else {
-        gen_load_gpr(t0, base);
-        gen_load_gpr(t1, index);
-        gen_op_addr_add(ctx, t0, t1);
+        gen_load_gpr(t0, index);
+        gen_op_addr_add(ctx, t0, cpu_gpr[base]);
     }
     /* Don't do NOP if destination is zero: we must perform the actual
        memory access. */