target-ppc: improve mfcr/mtcrf

- use ctz32 instead of ffs - 1
- small optimisation of mtcrf
- add the name of both opcodes

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6669 c046a42c-6fe2-441c-8c8c-71466251a162

target-ppc/translate.c

@@ -28,6 +28,7 @@
 #include "disas.h"
 #include "tcg-op.h"
 #include "qemu-common.h"
+#include "host-utils.h"
 
 #include "helper.h"
 #define GEN_HELPER 1
@@ -3836,7 +3837,7 @@ GEN_HANDLER(mcrxr, 0x1F, 0x00, 0x10, 0x007FF801, PPC_MISC)
     tcg_gen_andi_tl(cpu_xer, cpu_xer, ~(1 << XER_SO | 1 << XER_OV | 1 << XER_CA));
 }
 
-/* mfcr */
+/* mfcr mfocrf */
 GEN_HANDLER(mfcr, 0x1F, 0x13, 0x00, 0x00000801, PPC_MISC)
 {
     uint32_t crm, crn;
@@ -3844,7 +3845,7 @@ GEN_HANDLER(mfcr, 0x1F, 0x13, 0x00, 0x00000801, PPC_MISC)
     if (likely(ctx->opcode & 0x00100000)) {
         crm = CRM(ctx->opcode);
         if (likely(crm && ((crm & (crm - 1)) == 0))) {
-            crn = ffs (crm) - 1;
+            crn = ctz32 (crm);
             tcg_gen_extu_i32_tl(cpu_gpr[rD(ctx->opcode)], cpu_crf[7 - crn]);
             tcg_gen_shli_i32(cpu_gpr[rD(ctx->opcode)],
                              cpu_gpr[rD(ctx->opcode)], crn * 4);
@@ -3931,7 +3932,7 @@ GEN_HANDLER(mftb, 0x1F, 0x13, 0x0B, 0x00000001, PPC_MFTB)
     gen_op_mfspr(ctx);
 }
 
-/* mtcrf */
+/* mtcrf mtocrf*/
 GEN_HANDLER(mtcrf, 0x1F, 0x10, 0x04, 0x00000801, PPC_MISC)
 {
     uint32_t crm, crn;
@@ -3940,10 +3941,10 @@ GEN_HANDLER(mtcrf, 0x1F, 0x10, 0x04, 0x00000801, PPC_MISC)
     if (likely((ctx->opcode & 0x00100000))) {
         if (crm && ((crm & (crm - 1)) == 0)) {
             TCGv_i32 temp = tcg_temp_new_i32();
-            crn = ffs (crm) - 1;
+            crn = ctz32 (crm);
             tcg_gen_trunc_tl_i32(temp, cpu_gpr[rS(ctx->opcode)]);
-            tcg_gen_shri_i32(cpu_crf[7 - crn], temp, crn * 4);
-            tcg_gen_andi_i32(cpu_crf[7 - crn], cpu_crf[7 - crn], 0xf);
+            tcg_gen_shri_i32(temp, temp, crn * 4);
+            tcg_gen_andi_i32(cpu_crf[7 - crn], temp, 0xf);
             tcg_temp_free_i32(temp);
         }
     } else {

target-ppc/translate_init.c

@@ -24,7 +24,6 @@
  */
 
 #include "dis-asm.h"
-#include "host-utils.h"
 #include "gdbstub.h"
 
 //#define PPC_DUMP_CPU