search for: firstpriv

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2018 Apr 25
2
[LLVM][RFC] Representing the target device information in the LLVM IR
...rget devices, the target compilation has to generate a single host to support all the targets. In order to make sure all the target outlined functions have the same interface, the information of all the target architectures is needed during host and target compilation. In the following example, the firstprivate variable 'd' is passed by value under x86_64-mic and passed by reference under i386-pc-linux-gnu. In order to avoid this inconsistency, the compiler needs all the target architecture information so it can find a common interface. In this example, it will change the x86_64-mic interface f...
2018 Apr 25
0
[LLVM][RFC] Representing the target device information in the LLVM IR
...compilation has to generate a single host > to support all the targets. In order to make sure all the target > outlined functions have the same interface, the information of all the > target architectures is needed during host and target compilation. In > the following example, the firstprivate variable ‘d’ is passed by > value under x86_64-mic and passed by reference under > i386-pc-linux-gnu. In order to avoid this inconsistency, the compiler > needs all the target architecture information so it can find a common > interface. In this example, it will change the x86_64...
2018 Apr 25
2
[LLVM][RFC] Representing the target device information in the LLVM IR
...rget devices, the target compilation has to generate a single host to support all the targets. In order to make sure all the target outlined functions have the same interface, the information of all the target architectures is needed during host and target compilation. In the following example, the firstprivate variable 'd' is passed by value under x86_64-mic and passed by reference under i386-pc-linux-gnu. In order to avoid this inconsistency, the compiler needs all the target architecture information so it can find a common interface. In this example, it will change the x86_64-mic interface f...
2017 Jan 12
3
[RFC] IR-level Region Annotations
And “map” and “firstprivate” … are represented as MDString, right? Thanks. From: Hongbin Zheng [mailto:etherzhhb at gmail.com] Sent: Wednesday, January 11, 2017 3:58 PM To: Tian, Xinmin <xinmin.tian at intel.com> Cc: David Majnemer <david.majnemer at gmail.com>; Hal Finkel <hfinkel at anl.gov>; llvm-dev...
2017 Jan 11
2
[RFC] IR-level Region Annotations
...rstand if there is any difference between token scheme and intrinsic scheme in this regard. tail call token @llvm.directive.scope.entry() [ "target teams distribute"(), "parallel for", "simd" (), "shared" (i32 *xp, i32 *yp), "linear_iv" (), "firstprivate" (i32 m, i32 n), "map" (m, n) ] ; From: Hongbin Zheng [mailto:etherzhhb at gmail.com] Sent: Wednesday, January 11, 2017 3:29 PM To: Tian, Xinmin <xinmin.tian at intel.com> Cc: David Majnemer <david.majnemer at gmail.com>; Hal Finkel <hfinkel at anl.gov>; llvm-d...
2018 Apr 26
4
[LLVM][RFC] Representing the target device information in the LLVM IR
For the firstprivate clause, the compiler generates code to pass it by value or by reference to the outlined function. The reason the first private scalars is generally passed by value is for the performance reason. For this particular case, the compiler cannot generate code to pass the double @gg by value under i3...
2012 Oct 02
7
[LLVMdev] [RFC] Parallelization metadata and intrinsics in LLVM (for OpenMP, etc.)
...lelization metadata will be removed) > by the ParallelizationCleanup. The same is true for all other > cross-referenced metadata below. > > Note that parallel regions can be nested. > > As a quick example, something like: > int main() { > int a; > #pragma omp parallel firstprivate(a) > do_something(a) > ... > } > > becomes something like: > > define private void @parreg(i32 %a) { > entry: > call void @do_something(i32 %a) > ret > } > > define i32 @main() { > entry: > ... > call void @parreg1(i32 %a) !parallel !0...
2017 Jan 11
2
[RFC] IR-level Region Annotations
Would you send us the LLVM IR for below example using token and OpBundle. So, we can understand better. Thanks. #pragma omp target teams distribute parallel for simd shared(xp, yp) linear(i) firstprivate(m, n) map(m, n) for (i=0; i<2*N; i++) { xp[i*m + j] = -1; yp[i*n +j] = -2; } #pragma prefetch x:1:20 y:0:10 for (i=0; i<2*N; i++) { xp[i*m + j] = -1; yp[i*n +j] = -2; } From: Hongbin Zheng [mailto:etherzhhb at gmail.com] Sent: Wednesday, January 11, 2017 3:09 PM To: Tian, Xinmin <xi...
2018 Apr 26
0
[LLVM][RFC] Representing the target device information in the LLVM IR
...a pointer to other pointers, etc.? I understand that OpenMP v5 is expected to have some custom "mappers" to handle deep copying and translation. Is this related to the design space here? Thanks again, Hal On 04/25/2018 07:22 PM, Lin, Jin via llvm-dev wrote: > > For the firstprivate clause, the compiler generates code to pass it  > by value or by reference to the outlined function. The reason the > first private scalars is generally passed by value is for the > performance reason. > > For this particular case, the compiler cannot generate code to pass > th...
2018 Jan 18
0
Change memcpy/memmove/memset to have dest and source alignment attributes
...y the middle of next week, and then steps 5 & 6 in the coming weeks. Landing step 1 will potentially have a large impact on downstream consumer’s tests. For example, a front-end that checks IR generation of constructs implemented using memcpy/memmove/memset; the Clang tests for OpenMP firstprivate/lastprivate clauses, for instance, required a lot of manual updating. These sorts of tests will need to be updated to match the new pattern printed for the memory intrinsics. I’ve included an extended sed script in the commit log that can update many patterns, but definitely does not catch t...
2012 Oct 02
0
[LLVMdev] [RFC] OpenMP Representation in LLVM IR
...> 1) Guarantee correct semantics of directives and clauses. This > includes nomenclature and number of clauses in directives, correct > nesting of directives, values of clauses, etc. > > For example, front-ends should guarantee that omp single directive has > at most one private, firstprivate, copyprivate and nowait clause, and > nothing else; omp section directive is nested inside omp sections > directive; the only possible value of private clause is a list of > variables available at the point where this clause is present; etc. > > 2) Guarantee correct semantics of s...
2012 Sep 28
11
[LLVMdev] [RFC] OpenMP Representation in LLVM IR
...----------------------------- 1) Guarantee correct semantics of directives and clauses. This includes nomenclature and number of clauses in directives, correct nesting of directives, values of clauses, etc. For example, front-ends should guarantee that omp single directive has at most one private, firstprivate, copyprivate and nowait clause, and nothing else; omp section directive is nested inside omp sections directive; the only possible value of private clause is a list of variables available at the point where this clause is present; etc. 2) Guarantee correct semantics of statements / structur...
2018 Apr 27
2
[LLVM][RFC] Representing the target device information in the LLVM IR
...at OpenMP v5 is expected to have some custom "mappers" > to handle deep copying and translation. Is this related to the design > space here? > > Thanks again, > > Hal > >   > > On 04/25/2018 07:22 PM, Lin, Jin via llvm-dev wrote: > > For the firstprivate clause, the compiler generates code to pass > it  by value or by reference to the outlined function. The reason > the first private scalars is generally passed by value is for the > performance reason. > > For this particular case, the compiler cannot generate code...
2020 Feb 15
5
[flang-dev] About OpenMP dialect in MLIR
...p task shared(x)) 2. Loop (nest) transformations (permute / split / fuse / tile, etc) will happen ignoring the surrounding OpenMP operations. 3. Hoisting and sinking of various memory/ SSA values inside the OpenMP region. This goes against the likes of “map”, “firstprivate”, shared, etc clauses and more. 2) Various loop operations (loop.for, affine.for, fir.do) have (or will have) different transformations/ optimization passes which are different from one another. Example: 1. AffineLoopInvariantCodeMotion.cpp is different from LoopInvariantCod...
2012 Oct 02
0
[LLVMdev] [RFC] Parallelization metadata and intrinsics in LLVM (for OpenMP, etc.)
...) by the ParallelizationCleanup. The same is true > > for all other cross-referenced metadata below. > > > > Note that parallel regions can be nested. > > > > As a quick example, something like: > > int main() { > > int a; > > #pragma omp parallel firstprivate(a) > > do_something(a) > > ... > > } > > > > becomes something like: > > > > define private void @parreg(i32 %a) { > > entry: > > call void @do_something(i32 %a) > > ret > > } > > > > define i32 @main() { &...
2018 Apr 27
0
[LLVM][RFC] Representing the target device information in the LLVM IR
...ructure, or a pointer to other pointers, etc.? I understand that OpenMP v5 is expected to have some custom "mappers" to handle deep copying and translation. Is this related to the design space here? Thanks again, Hal On 04/25/2018 07:22 PM, Lin, Jin via llvm-dev wrote: For the firstprivate clause, the compiler generates code to pass it by value or by reference to the outlined function. The reason the first private scalars is generally passed by value is for the performance reason. For this particular case, the compiler cannot generate code to pass the double @gg by value under i3...
2012 Aug 10
2
[LLVMdev] [RFC] Parallelization metadata and intrinsics in LLVM (for OpenMP, etc.)
...- Parallel Regions ---- Inside a parallel region, a team of threads execute the sequence of instructions. A parallel region is specified by a function. This function may be executed by one or more threads in parallel. In terms of OpenMP: private() variables become variables local to the function. firstprivate() variables become parameters to the function. shared() variables become pass-by-pointer parameters. If the shared variable is not a global, then we allocate a local copy, using alloca followed by a store, and pass the new pointer to the function. For copyin() variables, we pass a copy of the va...
2012 Oct 03
0
[LLVMdev] [RFC] OpenMP Representation in LLVM IR
...> 1) Guarantee correct semantics of directives and clauses. This > includes nomenclature and number of clauses in directives, correct > nesting of directives, values of clauses, etc. > > For example, front-ends should guarantee that omp single directive has > at most one private, firstprivate, copyprivate and nowait clause, and > nothing else; omp section directive is nested inside omp sections > directive; the only possible value of private clause is a list of > variables available at the point where this clause is present; etc. > > 2) Guarantee correct semantics of...
2012 Oct 02
1
[LLVMdev] [RFC] Parallelization metadata and intrinsics in LLVM (for OpenMP, etc.)
...ame is true > > > for all other cross-referenced metadata below. > > > > > > Note that parallel regions can be nested. > > > > > > As a quick example, something like: > > > int main() { > > > int a; > > > #pragma omp parallel firstprivate(a) > > > do_something(a) > > > ... > > > } > > > > > > becomes something like: > > > > > > define private void @parreg(i32 %a) { > > > entry: > > > call void @do_something(i32 %a) > > > ret > &gt...
2020 Feb 17
3
[flang-dev] About OpenMP dialect in MLIR
...ransformations (permute / split / fuse / tile, etc) will >> happen ignoring the surrounding OpenMP operations. >> 3. >> >> Hoisting and sinking of various memory/ SSA values inside the OpenMP >> region. This goes against the likes of “map”, “firstprivate”, shared, etc >> clauses and more. >> >> >> 2) Various loop operations (loop.for, affine.for, fir.do) have (or will >> have) different transformations/ optimization passes which are different >> from one another. >> >> Example: >> >...