There is no problem.
Segher is concerned that -mcpu=powerpc64, which is suppose to generate
"generic" PPC64 code produces mftb instead of mfspr.
And the MFTB instruction is phased out of the architecture. I was
under the impression that now or in the near future there would be
implementations
On Fri, Sep 14, 2012 at 8:34 PM, Tulio Magno Quites Machado Filho
wrote:
> Segher Boessenkool writes:
> I don't understand the problem.
There is no problem.
Segher is concerned that -mcpu=powerpc64, which is suppose to generate
"generic" PPC64 code produces mftb instead of mfspr. However, the
Segher Boessenkool writes:
I don't think TARGET_MFCRF is correct. For example, if you
use
-mcpu=powerpc64 (which doesn't set this flag) you will get
code
that does not run on the newer machines.
Sorry, but it seems to be working here...
I explain how I tested this in the end of the email.
On Fri, Sep 14, 2012 at 4:52 PM, Segher Boessenkool
wrote:
>>> I don't think TARGET_MFCRF is correct. For example, if you use
>>> -mcpu=powerpc64 (which doesn't set this flag) you will get code
>>> that does not run on the newer machines.
>>
>> Sorry, but it seems to be working here...
>> I expla
I don't think TARGET_MFCRF is correct. For example, if you use
-mcpu=powerpc64 (which doesn't set this flag) you will get code
that does not run on the newer machines.
Sorry, but it seems to be working here...
I explain how I tested this in the end of the email.
David tells me all current CPU
Segher Boessenkool writes:
Hi Tulio,
Hi Segher,
+(define_expand "rs6000_get_timebase"
+ [(use (match_operand:DI 0 "gpc_reg_operand" ""))]
+ ""
+ "
+{
+ if (TARGET_POWERPC64)
+emit_insn (gen_rs6000_get_timebase_ppc64 (operands[0]));
+ else
+emit_insn (gen_rs6000_get_timebase_ppc
Hi Tulio,
@@ -14103,6 +14105,84 @@
""
"")
+(define_expand "rs6000_get_timebase"
+ [(use (match_operand:DI 0 "gpc_reg_operand" ""))]
+ ""
+ "
+{
+ if (TARGET_POWERPC64)
+emit_insn (gen_rs6000_get_timebase_ppc64 (operands[0]));
+ else
+emit_insn (gen_rs6000_get_timebase_ppc32 (
Add __builtin_ppc_get_timebase and __builtin_ppc_mftb to read the Time
Base Register on PowerPC.
They are required by applications that measure time at high frequencies
with high precision that can't afford a syscall.
__builtin_ppc_get_timebase returns the 64 bits of the Time Base Register
while __
