ispc/ispc

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Intel® Implicit SPMD Program Compiler

Stars: 3k
Forks: 352
Open beginner issues: 0
Indexed issues: 272

Dominant language: C++
License: BSD-3-Clause
Last GitHub push: Jul 21, 2026
Latest indexed: Sep 17, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue
PR merge metrics: No merged PRs in 30d

Open All

272 open issues indexed

Passing structs on the stack from C/C++ code is broken Open

C/C++ Compatibility Codegen Frontend / Parser

ispc/ispc#3 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add support for aliasing pointers/references Open

Performance

ispc/ispc#8 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Should add support for multi-element swizzle Open

Frontend / Parser

ispc/ispc#17 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Should have more --fast-math versions of transcendental functions in stdlib Open

Performance Standard Library

ispc/ispc#25 · 2 comments · 1 reaction · 1 assignee · Indexed Sep 17, 2026
Should support VectorTypes in cast instructions in FunctionEmitContext Open

Code Cleanups Codegen Frontend / Parser

ispc/ispc#35 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Values of threadIndex and threadCount from tasks_concrt.cpp and tasks_gcd.cpp are bogus Open

Runtime / Tasks

ispc/ispc#38 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Mark arrays as aligned Open

Frontend / Parser

ispc/ispc#76 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
scan performance improvements Open

Codegen Performance Standard Library

ispc/ispc#86 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Investigate additional optimizations for per-lane loops on 8/16-wide targets Open

Codegen Performance

ispc/ispc#90 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Add support for thread-local variables Open

Runtime / Tasks

ispc/ispc#94 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Generalize threadIndex to convey more information Open

Runtime / Tasks

ispc/ispc#95 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Constant folding improvements Open

Frontend / Parser Performance Quality of Life

ispc/ispc#113 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Support function pointers for task launch Open

Runtime / Tasks

ispc/ispc#120 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Allow initializers in decl lists to refer to earlier symbols in the same declaration Open

C/C++ Compatibility Frontend / Parser

ispc/ispc#124 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Should always generate masked and unmasked versions of functions Open

Codegen Performance

ispc/ispc#133 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Should issue warning on returning pointer to local variable Open

Frontend / Parser Good First Issue Quality of Life

ispc/ispc#136 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
should provide double-precision transcendentals Open

Standard Library

ispc/ispc#140 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Implement more efficient shifts in sse4.h Open

Codegen Performance Standard Library

ispc/ispc#144 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Implement specialized broadcast/rotate/shuffle in sse4.h Open

Codegen Performance Standard Library

ispc/ispc#146 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Can avoid some masking with pointer operations Open

Codegen Performance

ispc/ispc#148 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
switch: generate more efficient code for "default" with varying switches Open

Codegen Performance

ispc/ispc#157 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
switch: more efficient code for varying switch with many cases Open

Codegen Performance

ispc/ispc#158 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
switch: investigate alternative "varying" implementation approach Open

Codegen Performance

ispc/ispc#159 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
aobench and deferred examples give wrong result with scalar target Open

Codegen

ispc/ispc#167 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
allow bound uniform/varying members in soa structs? Open

Frontend / Parser

ispc/ispc#185 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
memory coalescing not working with soa data layout Open

Codegen Frontend / Parser Performance

ispc/ispc#186 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Be smarter about scalarization of extractelement of vectors Open

Codegen Performance

ispc/ispc#188 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
opportunity to improve coalescing Open

Performance

ispc/ispc#202 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Would be nice: print() handling compound types Open

Standard Library

ispc/ispc#210 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
Would be nice: constructor cast syntax Open

C/C++ Compatibility Frontend / Parser

ispc/ispc#212 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
allow 'varying' references? Open

Frontend / Parser

ispc/ispc#226 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
should issue error on extern "C" func with varying return/arg types Open

Frontend / Parser

ispc/ispc#239 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
should allow soa<> qualifier with short-vector types Open

Frontend / Parser

ispc/ispc#243 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
optionally insert automatic prefetches Open

Performance

ispc/ispc#246 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
provide more "internal" variables in the debugger Open

Quality of Life

ispc/ispc#251 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
vim syntax highlighting fails with '#' character Open

ispc/ispc#252 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
should run stdlib.ispc through preprocessor at runtime Open

Code Cleanups

ispc/ispc#254 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
should issue error if anonymous struct is used in function declaration Open

C/C++ Compatibility Frontend / Parser

ispc/ispc#258 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
should unique Type pointers Open

Frontend / Parser Performance

ispc/ispc#260 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
probably incorrect handling of phi nodes in LLVMVectorIsLinear/VectorValuesAllEqual Open

Code Cleanups Performance

ispc/ispc#261 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
should issue performance warning on varying variables that could be uniform Open

ispc/ispc#265 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
should allow non-compile-time-constants in global var initializers Open

Frontend / Parser

ispc/ispc#266 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
code quality for 'varying' break statements could be improved Open

Codegen Performance

ispc/ispc#277 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
handle nested foreach statements Open

Codegen

ispc/ispc#280 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026
incorrect error with forward declaration of struct member Open

Frontend / Parser

ispc/ispc#284 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 17, 2026
export should accept a single struct Open

Frontend / Parser Header Generation

ispc/ispc#285 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
new of pointer types doesn't work Open

Frontend / Parser

ispc/ispc#286 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 17, 2026
can't pass uniform value to function taking varying reference Open

C/C++ Compatibility Frontend / Parser

ispc/ispc#292 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
add support for unions Open

C/C++ Compatibility Frontend / Parser

ispc/ispc#297 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 17, 2026
gather coalescing doesn't happen for simple program Open

Performance

ispc/ispc#304 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 17, 2026

ispc/ispc

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