diff mbox

[0/7] tcg: conditional set and move opcodes

Message ID Pine.LNX.4.64.0912171825330.4454@linmac.oyster.ru
State New
Headers show

Commit Message

malc Dec. 17, 2009, 3:32 p.m. UTC 
On Wed, 16 Dec 2009, Richard Henderson wrote:

> This patch series adds support for setcond (aka setcc) and
> movcond (aka cmov) opcodes to TCG.
> 
> These new opcodes are considered "required" by the backend,
> because expanding them at the tcg level breaks the basic block.
> There might be some way to emulate within tcg internals, but
> that doesn't seem worthwhile, as essentially all hosts have
> some form of support for these.
> 
> I've implemented support for the new opcodes within the x86_64,
> i386, and sparc tcg backends.  The later is untested due to 
> lack of hardware and failure of the build system to cross-compile.
> However, it should be a decent starting point for whoever can.
> 
> I've implementing support for the new opcodes within the alpha,
> i386 and mips translators.  The translations work, as far as I
> can tell from linux-user-test.
> 
> Comments?

Some:
 a. It breaks tcg on PPC[1]:

    ...qemu/tcg/tcg.c:1378: tcg fatal error

 b. Documentation for movcond has a typo, t0 is assigned not t1
 
 c. Historically things like that were made conditional with
    a generic fallback (bswap, neg, not, rot, etc)

 d. Documentation for setcond2 is missing

 e. There's some indentation weirdness here and there and `git am'
    complains about added trailing whitespace

It would also be interesting to learn what impact adding those two
has on performance, any results?

[..snip..]

[1] With following i can run some i386 user tests on PPC32 (ls,
    openssl)

Comments

Laurent Desnogues Dec. 17, 2009, 3:37 p.m. UTC | #1 
On Thu, Dec 17, 2009 at 4:32 PM, malc <av1474@comtv.ru> wrote:
[...]
>
> Some:
>  a. It breaks tcg on PPC[1]:
>
>    ...qemu/tcg/tcg.c:1378: tcg fatal error

What a surprise :-)

I can provide a similar patch for ARM (I already have one
for my own implementation of setcond), but I'll wait for this
patch series to stabilize first.


Laurent

>  b. Documentation for movcond has a typo, t0 is assigned not t1
>
>  c. Historically things like that were made conditional with
>    a generic fallback (bswap, neg, not, rot, etc)
>
>  d. Documentation for setcond2 is missing
>
>  e. There's some indentation weirdness here and there and `git am'
>    complains about added trailing whitespace
>
> It would also be interesting to learn what impact adding those two
> has on performance, any results?
>
> [..snip..]
>
> [1] With following i can run some i386 user tests on PPC32 (ls,
>    openssl)
>
> diff --git a/tcg/ppc/tcg-target.c b/tcg/ppc/tcg-target.c
> index 07e6941..195af13 100644
> --- a/tcg/ppc/tcg-target.c
> +++ b/tcg/ppc/tcg-target.c
> @@ -316,6 +316,7 @@ static int tcg_target_const_match(tcg_target_long val,
>  #define STH    OPCD(44)
>  #define STW    OPCD(36)
>
> +#define ADDIC  OPCD(12)
>  #define ADDI   OPCD(14)
>  #define ADDIS  OPCD(15)
>  #define ORI    OPCD(24)
> @@ -339,6 +340,7 @@ static int tcg_target_const_match(tcg_target_long val,
>  #define CRANDC XO19(129)
>  #define CRNAND XO19(225)
>  #define CROR   XO19(449)
> +#define CRNOR  XO19( 33)
>
>  #define EXTSB  XO31(954)
>  #define EXTSH  XO31(922)
> @@ -365,6 +367,8 @@ static int tcg_target_const_match(tcg_target_long val,
>  #define MTSPR  XO31(467)
>  #define SRAWI  XO31(824)
>  #define NEG    XO31(104)
> +#define MFCR   XO31( 19)
> +#define CNTLZW XO31( 26)
>
>  #define LBZX   XO31( 87)
>  #define LHZX   XO31(279)
> @@ -1073,6 +1077,95 @@ static void tcg_out_brcond (TCGContext *s, int cond,
>     tcg_out_bc (s, tcg_to_bc[cond], label_index);
>  }
>
> +static void tcg_out_setcond (TCGContext *s, int cond, TCGArg arg0,
> +                             TCGArg arg1, TCGArg arg2, int const_arg2)
> +{
> +    int crop, sh;
> +
> +    switch (cond) {
> +    case TCG_COND_EQ:
> +        if (const_arg2) {
> +            if ((uint16_t) arg2 == arg2) {
> +                tcg_out32 (s, XORI | RS (arg1) | RA (0) | arg2);
> +            }
> +            else {
> +                tcg_out_movi (s, TCG_TYPE_I32, 0, arg2);
> +                tcg_out32 (s, XOR | SAB (arg1, 0, 0));
> +            }
> +        }
> +        else {
> +            tcg_out32 (s, XOR | SAB (arg1, 0, arg2));
> +        }
> +        tcg_out32 (s, CNTLZW | RS (0) | RA (0));
> +        tcg_out32 (s, (RLWINM
> +                       | RA (arg0)
> +                       | RS (0)
> +                       | SH (27)
> +                       | MB (5)
> +                       | ME (31)
> +                       )
> +            );
> +        return;
> +
> +    case TCG_COND_NE:
> +        if (const_arg2) {
> +            if ((uint16_t) arg2 == arg2) {
> +                tcg_out32 (s, XORI | RS (arg1) | RA (0) | arg2);
> +            }
> +            else {
> +                tcg_out_movi (s, TCG_TYPE_I32, 0, arg2);
> +                tcg_out32 (s, XOR | SAB (arg1, 0, 0));
> +            }
> +        }
> +        else {
> +            tcg_out32 (s, XOR | SAB (arg1, 0, arg2));
> +        }
> +
> +        tcg_out32 (s, ADDIC | RT (arg0) | RA (0) | 0xffff);
> +        tcg_out32 (s, SUBFE | TAB (arg0, arg0, 0));
> +        return;
> +
> +    case TCG_COND_LTU:
> +    case TCG_COND_LT:
> +        sh = 29;
> +        crop = 0;
> +        break;
> +
> +    case TCG_COND_GEU:
> +    case TCG_COND_GE:
> +        sh = 31;
> +        crop = CRNOR | BT (7, CR_EQ) | BA (7, CR_LT) | BB (7, CR_LT);
> +        break;
> +
> +    case TCG_COND_LEU:
> +    case TCG_COND_LE:
> +        sh = 31;
> +        crop = CRNOR | BT (7, CR_EQ) | BA (7, CR_GT) | BB (7, CR_GT);
> +        break;
> +
> +    case TCG_COND_GTU:
> +    case TCG_COND_GT:
> +        sh = 30;
> +        crop = 0;
> +        break;
> +
> +    default:
> +        tcg_abort ();
> +    }
> +
> +    tcg_out_cmp (s, cond, arg1, arg2, const_arg2, 7);
> +    tcg_out32 (s, MFCR | RT (0));
> +    if (crop) tcg_out32 (s, crop);
> +    tcg_out32 (s, (RLWINM
> +                   | RA (arg0)
> +                   | RS (0)
> +                   | SH (sh)
> +                   | MB (31)
> +                   | ME (31)
> +                   )
> +            );
> +}
> +
>  /* XXX: we implement it at the target level to avoid having to
>    handle cross basic blocks temporaries */
>  static void tcg_out_brcond2 (TCGContext *s, const TCGArg *args,
> @@ -1496,6 +1589,10 @@ static void tcg_out_op(TCGContext *s, int opc, const TCGArg *args,
>         tcg_out32 (s, EXTSH | RS (args[1]) | RA (args[0]));
>         break;
>
> +    case INDEX_op_setcond_i32:
> +        tcg_out_setcond(s, args[3], args[0], args[1], args[2], const_args[2]);
> +        break;
> +
>     default:
>         tcg_dump_ops (s, stderr);
>         tcg_abort ();
> @@ -1544,6 +1641,8 @@ static const TCGTargetOpDef ppc_op_defs[] = {
>
>     { INDEX_op_neg_i32, { "r", "r" } },
>
> +    { INDEX_op_setcond_i32, { "r", "r", "ri" } },
> +
>  #if TARGET_LONG_BITS == 32
>     { INDEX_op_qemu_ld8u, { "r", "L" } },
>     { INDEX_op_qemu_ld8s, { "r", "L" } },
>
> --
> mailto:av1474@comtv.ru
>
>
>
Richard Henderson Dec. 17, 2009, 5:07 p.m. UTC | #2 
On 12/17/2009 07:32 AM, malc wrote:
>> These new opcodes are considered "required" by the backend,
>> because expanding them at the tcg level breaks the basic block.
>> There might be some way to emulate within tcg internals, but
>> that doesn't seem worthwhile, as essentially all hosts have
>> some form of support for these.
...
 >   c. Historically things like that were made conditional with
 >      a generic fallback (bswap, neg, not, rot, etc)

I answered this one above.  A generic fallback would break the
basic block, which would break TCGs simple register allocation.

>   b. Documentation for movcond has a typo, t0 is assigned not t1

Oops.  Will fix.

>   d. Documentation for setcond2 is missing

Ah, I see that brcond2 is missing as well; I'll fix that too.

> It would also be interesting to learn what impact adding those two
> has on performance, any results?

Hmph, not as much as I would have liked.  I suppose Intel is getting 
pretty darned good with its branch prediction.  It shaved about 3 
minutes off 183.equake from what I posted earlier this week; that's 
something around a 7% improvement, assuming it's not just all noise (I 
havn't run that test enough times to see what the variation is).

> +    case TCG_COND_NE:
> +        if (const_arg2) {
> +            if ((uint16_t) arg2 == arg2) {
> +                tcg_out32 (s, XORI | RS (arg1) | RA (0) | arg2);
> +            }
> +            else {
> +                tcg_out_movi (s, TCG_TYPE_I32, 0, arg2);
> +                tcg_out32 (s, XOR | SAB (arg1, 0, 0));
> +            }
> +        }
> +        else {
> +            tcg_out32 (s, XOR | SAB (arg1, 0, arg2));
> +        }
> +
> +        tcg_out32 (s, ADDIC | RT (arg0) | RA (0) | 0xffff);
> +        tcg_out32 (s, SUBFE | TAB (arg0, arg0, 0));
> +        return;

Heh, you know a trick that gcc doesn't for powerpc.  It just adds an xor 
at the end of the EQ sequence.


r~
malc Dec. 17, 2009, 5:47 p.m. UTC | #3 
On Thu, 17 Dec 2009, Richard Henderson wrote:

> On 12/17/2009 07:32 AM, malc wrote:
> > > These new opcodes are considered "required" by the backend,
> > > because expanding them at the tcg level breaks the basic block.
> > > There might be some way to emulate within tcg internals, but
> > > that doesn't seem worthwhile, as essentially all hosts have
> > > some form of support for these.
> ..
> >   c. Historically things like that were made conditional with
> >      a generic fallback (bswap, neg, not, rot, etc)
> 
> I answered this one above.  A generic fallback would break the
> basic block, which would break TCGs simple register allocation.

Urgh.. I really hate implementing those xxxx2 ops.

See for example this lovely thread:
http://www.archivum.info/qemu-devel@nongnu.org/2008-06/00306/%5BQemu-devel%5D_%5B4705%5D_Fix_div%5Bu%5D2.

> 
> >   b. Documentation for movcond has a typo, t0 is assigned not t1
> 
> Oops.  Will fix.
> 
> >   d. Documentation for setcond2 is missing
> 
> Ah, I see that brcond2 is missing as well; I'll fix that too.
> 
> > It would also be interesting to learn what impact adding those two
> > has on performance, any results?
> 
> Hmph, not as much as I would have liked.  I suppose Intel is getting pretty
> darned good with its branch prediction.  It shaved about 3 minutes off
> 183.equake from what I posted earlier this week; that's something around a 7%
> improvement, assuming it's not just all noise (I havn't run that test enough
> times to see what the variation is).

If 3 minutes(!!) is only 7% then this test is a monster.

> 
> > +    case TCG_COND_NE:
> > +        if (const_arg2) {
> > +            if ((uint16_t) arg2 == arg2) {
> > +                tcg_out32 (s, XORI | RS (arg1) | RA (0) | arg2);
> > +            }
> > +            else {
> > +                tcg_out_movi (s, TCG_TYPE_I32, 0, arg2);
> > +                tcg_out32 (s, XOR | SAB (arg1, 0, 0));
> > +            }
> > +        }
> > +        else {
> > +            tcg_out32 (s, XOR | SAB (arg1, 0, arg2));
> > +        }
> > +
> > +        tcg_out32 (s, ADDIC | RT (arg0) | RA (0) | 0xffff);
> > +        tcg_out32 (s, SUBFE | TAB (arg0, arg0, 0));
> > +        return;
> 
> Heh, you know a trick that gcc doesn't for powerpc.  It just adds an xor at
> the end of the EQ sequence.

Well, truth be told, i just looked at what gcc 4.4.1 produces for:

    return op1 != op2 ? 1 : 0;
               ==

And did the same. FWIW gcc's handling of LT,LE,GT,GE is not as naive as
this implementation (it avoid CR ops/moves when op2 is immediate), but
i'm not sure if the gain is worth the pain though, so left it is for
simplicity's sake.

P.S. BTW PPC has the same dilema w.r.t. conditional moves, on x86 it's
     cmov that is not universally available for PPC it's isel, given
     that there's a also some fruit in going with LDBRX were available
     i guess it's worthwile investigation the proper interface for
     enquiring the host CPU features...
Richard Henderson Dec. 17, 2009, 5:48 p.m. UTC | #4 
On 12/17/2009 09:07 AM, Richard Henderson wrote:
>> + case TCG_COND_NE:
>> + if (const_arg2) {
>> + if ((uint16_t) arg2 == arg2) {
>> + tcg_out32 (s, XORI | RS (arg1) | RA (0) | arg2);
>> + }
>> + else {
>> + tcg_out_movi (s, TCG_TYPE_I32, 0, arg2);
>> + tcg_out32 (s, XOR | SAB (arg1, 0, 0));
>> + }
>> + }
>> + else {
>> + tcg_out32 (s, XOR | SAB (arg1, 0, arg2));
>> + }
>> +
>> + tcg_out32 (s, ADDIC | RT (arg0) | RA (0) | 0xffff);
>> + tcg_out32 (s, SUBFE | TAB (arg0, arg0, 0));
>> + return;
>
> Heh, you know a trick that gcc doesn't for powerpc. It just adds an xor
> at the end of the EQ sequence.

Ah, gcc does know the trick, it just thinks it's only a win on old Power 
systems.


r~
Richard Henderson Dec. 17, 2009, 6:09 p.m. UTC | #5 
On 12/17/2009 09:47 AM, malc wrote:
> Urgh.. I really hate implementing those xxxx2 ops.
>
> See for example this lovely thread:
> http://www.archivum.info/qemu-devel@nongnu.org/2008-06/00306/%5BQemu-devel%5D_%5B4705%5D_Fix_div%5Bu%5D2.

Heh, that one's pretty nasty.

But fwiw, you can just call into your brcond2 implementation for 
setcond2.  There's a bit more work to do on sparc and mips because 
they'd prefer we filled the delay slots.


r~
malc Dec. 18, 2009, 3:40 p.m. UTC | #6 
On Thu, 17 Dec 2009, Richard Henderson wrote:

> On 12/17/2009 07:32 AM, malc wrote:
> > > These new opcodes are considered "required" by the backend,
> > > because expanding them at the tcg level breaks the basic block.
> > > There might be some way to emulate within tcg internals, but
> > > that doesn't seem worthwhile, as essentially all hosts have
> > > some form of support for these.
> ..
> >   c. Historically things like that were made conditional with
> >      a generic fallback (bswap, neg, not, rot, etc)
> 
> I answered this one above.  A generic fallback would break the
> basic block, which would break TCGs simple register allocation.
> 
> >   b. Documentation for movcond has a typo, t0 is assigned not t1
> 
> Oops.  Will fix.
> 
> >   d. Documentation for setcond2 is missing
> 
> Ah, I see that brcond2 is missing as well; I'll fix that too.
> 
> > It would also be interesting to learn what impact adding those two
> > has on performance, any results?
> 
> Hmph, not as much as I would have liked.  I suppose Intel is getting pretty
> darned good with its branch prediction.  It shaved about 3 minutes off
> 183.equake from what I posted earlier this week; that's something around a 7%
> improvement, assuming it's not just all noise (I havn't run that test enough
> times to see what the variation is).
> 

After fixing a bug (crop was done after reading the cr) i run some
openssl speed benchmarks, and, at least here on an MPC7447A, got a
speed degradation, tiny but consistent. Took a very quick glance at
the generated code and the first thing i saw was this:

----------------
IN: 
0x40082295:  movzbl (%eax),%eax
0x40082298:  cmp    $0x3d,%al
0x4008229a:  setne  %dl
0x4008229d:  test   %al,%al
0x4008229f:  je     0x400822d2

OP after liveness analysis:
 mov_i32 tmp2,eax
 qemu_ld8u tmp0,tmp2,$0xffffffff
 mov_i32 eax,tmp0
 movi_i32 tmp1,$0x3d
 mov_i32 tmp0,eax
 nopn $0x2,$0x2
 sub_i32 cc_dst,tmp0,tmp1
 movi_i32 tmp13,$0xff
 and_i32 tmp4,cc_dst,tmp13
 movi_i32 tmp13,$0x0
 setcond_i32 tmp0,tmp4,tmp13,ne
 movi_i32 tmp14,$0xff
 and_i32 tmp13,tmp0,tmp14

....

OUT: [size=204]
0x601051b0:  lwz     r14,0(r27)
0x601051b4:  lbzx    r14,0,r14
0x601051b8:  mr      r15,r14
0x601051bc:  addi    r15,r15,-61
0x601051c0:  andi.   r15,r15,255
0x601051c4:  cmpwi   cr6,r15,0
0x601051c8:  crnot   4*cr7+eq,4*cr6+eq
0x601051cc:  mfcr    r0
0x601051d0:  rlwinm  r15,r0,31,31,31
0x601051d4:  andi.   r15,r15,255

...

So the fact that setcond produces 0/1 was never communicated to the
tcg, not that i would claim that it's possible at all...

[..snip..]
Richard Henderson Dec. 18, 2009, 4:05 p.m. UTC | #7 
On 12/18/2009 07:40 AM, malc wrote:
> After fixing a bug (crop was done after reading the cr) i run some
> openssl speed benchmarks, and, at least here on an MPC7447A, got a
> speed degradation, tiny but consistent.

Well, you could try rendering the setcond with branches instead of 
logical operations.  You'll still gain the benefit of not having ended 
the TCG basic block, and forced the stores of globals to their slots etc 
etc.

> IN:
> 0x40082295:  movzbl (%eax),%eax
> 0x40082298:  cmp    $0x3d,%al
> 0x4008229a:  setne  %dl
> 0x4008229d:  test   %al,%al
> 0x4008229f:  je     0x400822d2
>
> OP after liveness analysis:
>   mov_i32 tmp2,eax
>   qemu_ld8u tmp0,tmp2,$0xffffffff
>   mov_i32 eax,tmp0
>   movi_i32 tmp1,$0x3d
>   mov_i32 tmp0,eax
>   nopn $0x2,$0x2
>   sub_i32 cc_dst,tmp0,tmp1
>   movi_i32 tmp13,$0xff
>   and_i32 tmp4,cc_dst,tmp13
>   movi_i32 tmp13,$0x0
>   setcond_i32 tmp0,tmp4,tmp13,ne
>   movi_i32 tmp14,$0xff
>   and_i32 tmp13,tmp0,tmp14
>
> ....
>
> OUT: [size=204]
> 0x601051b0:  lwz     r14,0(r27)
> 0x601051b4:  lbzx    r14,0,r14
> 0x601051b8:  mr      r15,r14
> 0x601051bc:  addi    r15,r15,-61
> 0x601051c0:  andi.   r15,r15,255
> 0x601051c4:  cmpwi   cr6,r15,0
> 0x601051c8:  crnot   4*cr7+eq,4*cr6+eq
> 0x601051cc:  mfcr    r0
> 0x601051d0:  rlwinm  r15,r0,31,31,31
> 0x601051d4:  andi.   r15,r15,255
>
> ...
>
> So the fact that setcond produces 0/1 was never communicated to the
> tcg, not that i would claim that it's possible at all...

It isn't.

And anyway, if you look at the opcodes generated without the setcond 
patch you'll see that and 255 in there as well.  Some more surgery on 
the i386 translator could probably get rid of that.  All I replaced were 
sequences of

   brcond c1,c2,$lab_true
   movi dest,0
   br $lab_over
   movi dest,1



r~
diff mbox

Patch

diff --git a/tcg/ppc/tcg-target.c b/tcg/ppc/tcg-target.c
index 07e6941..195af13 100644
--- a/tcg/ppc/tcg-target.c
+++ b/tcg/ppc/tcg-target.c
@@ -316,6 +316,7 @@  static int tcg_target_const_match(tcg_target_long val,
 #define STH    OPCD(44)
 #define STW    OPCD(36)
 
+#define ADDIC  OPCD(12)
 #define ADDI   OPCD(14)
 #define ADDIS  OPCD(15)
 #define ORI    OPCD(24)
@@ -339,6 +340,7 @@  static int tcg_target_const_match(tcg_target_long val,
 #define CRANDC XO19(129)
 #define CRNAND XO19(225)
 #define CROR   XO19(449)
+#define CRNOR  XO19( 33)
 
 #define EXTSB  XO31(954)
 #define EXTSH  XO31(922)
@@ -365,6 +367,8 @@  static int tcg_target_const_match(tcg_target_long val,
 #define MTSPR  XO31(467)
 #define SRAWI  XO31(824)
 #define NEG    XO31(104)
+#define MFCR   XO31( 19)
+#define CNTLZW XO31( 26)
 
 #define LBZX   XO31( 87)
 #define LHZX   XO31(279)
@@ -1073,6 +1077,95 @@  static void tcg_out_brcond (TCGContext *s, int cond,
     tcg_out_bc (s, tcg_to_bc[cond], label_index);
 }
 
+static void tcg_out_setcond (TCGContext *s, int cond, TCGArg arg0,
+                             TCGArg arg1, TCGArg arg2, int const_arg2)
+{
+    int crop, sh;
+
+    switch (cond) {
+    case TCG_COND_EQ:
+        if (const_arg2) {
+            if ((uint16_t) arg2 == arg2) {
+                tcg_out32 (s, XORI | RS (arg1) | RA (0) | arg2);
+            }
+            else {
+                tcg_out_movi (s, TCG_TYPE_I32, 0, arg2);
+                tcg_out32 (s, XOR | SAB (arg1, 0, 0));
+            }
+        }
+        else {
+            tcg_out32 (s, XOR | SAB (arg1, 0, arg2));
+        }
+        tcg_out32 (s, CNTLZW | RS (0) | RA (0));
+        tcg_out32 (s, (RLWINM
+                       | RA (arg0)
+                       | RS (0)
+                       | SH (27)
+                       | MB (5)
+                       | ME (31)
+                       )
+            );
+        return;
+
+    case TCG_COND_NE:
+        if (const_arg2) {
+            if ((uint16_t) arg2 == arg2) {
+                tcg_out32 (s, XORI | RS (arg1) | RA (0) | arg2);
+            }
+            else {
+                tcg_out_movi (s, TCG_TYPE_I32, 0, arg2);
+                tcg_out32 (s, XOR | SAB (arg1, 0, 0));
+            }
+        }
+        else {
+            tcg_out32 (s, XOR | SAB (arg1, 0, arg2));
+        }
+
+        tcg_out32 (s, ADDIC | RT (arg0) | RA (0) | 0xffff);
+        tcg_out32 (s, SUBFE | TAB (arg0, arg0, 0));
+        return;
+
+    case TCG_COND_LTU:
+    case TCG_COND_LT:
+        sh = 29;
+        crop = 0;
+        break;
+
+    case TCG_COND_GEU:
+    case TCG_COND_GE:
+        sh = 31;
+        crop = CRNOR | BT (7, CR_EQ) | BA (7, CR_LT) | BB (7, CR_LT);
+        break;
+
+    case TCG_COND_LEU:
+    case TCG_COND_LE:
+        sh = 31;
+        crop = CRNOR | BT (7, CR_EQ) | BA (7, CR_GT) | BB (7, CR_GT);
+        break;
+
+    case TCG_COND_GTU:
+    case TCG_COND_GT:
+        sh = 30;
+        crop = 0;
+        break;
+
+    default:
+        tcg_abort ();
+    }
+
+    tcg_out_cmp (s, cond, arg1, arg2, const_arg2, 7);
+    tcg_out32 (s, MFCR | RT (0));
+    if (crop) tcg_out32 (s, crop);
+    tcg_out32 (s, (RLWINM
+                   | RA (arg0)
+                   | RS (0)
+                   | SH (sh)
+                   | MB (31)
+                   | ME (31)
+                   )
+            );
+}
+
 /* XXX: we implement it at the target level to avoid having to
    handle cross basic blocks temporaries */
 static void tcg_out_brcond2 (TCGContext *s, const TCGArg *args,
@@ -1496,6 +1589,10 @@  static void tcg_out_op(TCGContext *s, int opc, const TCGArg *args,
         tcg_out32 (s, EXTSH | RS (args[1]) | RA (args[0]));
         break;
 
+    case INDEX_op_setcond_i32:
+        tcg_out_setcond(s, args[3], args[0], args[1], args[2], const_args[2]);
+        break;
+
     default:
         tcg_dump_ops (s, stderr);
         tcg_abort ();
@@ -1544,6 +1641,8 @@  static const TCGTargetOpDef ppc_op_defs[] = {
 
     { INDEX_op_neg_i32, { "r", "r" } },
 
+    { INDEX_op_setcond_i32, { "r", "r", "ri" } },
+
 #if TARGET_LONG_BITS == 32
     { INDEX_op_qemu_ld8u, { "r", "L" } },
     { INDEX_op_qemu_ld8s, { "r", "L" } },