Displaying 7 results from an estimated 7 matches for "is_sorted".
2019 Oct 19
3
Replicate Individual O3 optimizations
On Thu, Oct 17, 2019 at 11:22 AM David Greene via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> hameeza ahmed via llvm-dev <llvm-dev at lists.llvm.org> writes:
>
> > Hello,
> > I want to study the individual O3 optimizations. For this I am using
> > following commands, but unable to replicate O3 behavior.
> >
> > 1.
2019 Oct 24
2
Replicate Individual O3 optimizations
I run matrix multiplication code with both the approaches o3 at clang and
o3 at opt. clang o3 is about 2.97x faster than opt o3.
On Mon, Oct 21, 2019 at 8:24 AM Neil Nelson <nnelson at infowest.com> wrote:
> is_sorted.cpp
> bool is_sorted(int *a, int n) {
>
> for (int i = 0; i < n - 1; i++)
>
> if (a[i] > a[i + 1])
> return false;
> return true;
> }
>
> https://blog.regehr.org/archives/1605 How Clang Compiles a Functionhttps://blog.regehr.org/archives/1603 How LL...
2019 Sep 04
0
[ALTREP] What is the meaning of the return value of Is_sorted and No_NA function?
...On Tue, Sep 3, 2019 at 2:49 PM Wang Jiefei <szwjf08 at gmail.com> wrote:
> Hi,
>
>
>
> I would like to figure out the meaning of the return value of these two
> functions. Here are the default definitions I find from R source code:
>
>
>
> static int altreal_Is_sorted_default(SEXP x) { return UNKNOWN_SORTEDNESS;
> }
>
> static int altreal_No_NA_default(SEXP x) { return 0; }
>
> I guess the macro *UNKNOWN_SORTEDNESS *in *Is_sorted* and 0 in *No_NA *simply means
> unknown sorted/NA status of the vector, so R will loop over the vector and
> fin...
2019 Sep 11
0
[ALTREP] What is the meaning of the return value of Is_sorted and No_NA function?
...On Wed, Sep 11, 2019 at 12:04 AM Wang Jiefei <szwjf08 at gmail.com> wrote:
> Hi,
>
>
>
> I would like to figure out the meaning of the return value of these two
> functions. Here are the default definitions I find from R source code:
>
>
>
> static int altreal_Is_sorted_default(SEXP x) { return UNKNOWN_SORTEDNESS; }
>
> static int altreal_No_NA_default(SEXP x) { return 0; }
>
> I guess the macro *UNKNOWN_SORTEDNESS *in *Is_sorted* and 0 in *No_NA
> *simply means
> unknown sorted/NA status of the vector, so R will loop over the vector and
> fin...
2018 Nov 15
2
STRING_IS_SORTED claims as.character(1:100) is sorted
If I have loaded the C code:
SEXP altrep_STRING_IS_SORTED(SEXP x)
{
return ScalarInteger(STRING_IS_SORTED(x));
}
and defined the function:
issort <- function(x) .Call("altrep_STRING_IS_SORTED",x)
I am seeing the following results in R 3.5.1/Linux:
> issort(LETTERS)
[1] NA
> issort(as.character(1:100)) #...
2019 Sep 03
2
[ALTREP] What is the meaning of the return value of Is_sorted and No_NA function?
Hi,
I would like to figure out the meaning of the return value of these two
functions. Here are the default definitions I find from R source code:
static int altreal_Is_sorted_default(SEXP x) { return UNKNOWN_SORTEDNESS; }
static int altreal_No_NA_default(SEXP x) { return 0; }
I guess the macro *UNKNOWN_SORTEDNESS *in *Is_sorted* and 0 in *No_NA
*simply means
unknown sorted/NA status of the vector, so R will loop over the vector and
find the answer. However, what shoul...
2019 Sep 11
1
[ALTREP] What is the meaning of the return value of Is_sorted and No_NA function?
...ei <szwjf08 at gmail.com> wrote:
>
>> Hi,
>>
>>
>>
>> I would like to figure out the meaning of the return value of these two
>> functions. Here are the default definitions I find from R source code:
>>
>>
>>
>> static int altreal_Is_sorted_default(SEXP x) { return UNKNOWN_SORTEDNESS;
>> }
>>
>> static int altreal_No_NA_default(SEXP x) { return 0; }
>>
>> I guess the macro *UNKNOWN_SORTEDNESS *in *Is_sorted* and 0 in *No_NA
>> *simply means
>> unknown sorted/NA status of the vector, so R will...