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Merge pull request #29156 from varun-jaiswal17:fix/msvc-windows

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fix MSVC error: use name constexp for alignas array size in INT8 kernel #29156
  
### Problem
Windows CI fails with MSVC error C2131 in `conv2_int8_kernels.simd.hpp`:

    error C2131: expression did not evaluate to a constant
    failure was caused by a read of a variable outside its lifetime
    see usage of 'this'

Two array declarations inside `parallel_for_` lambdas used `constexpr`
variables defined inside the lambda body as array sizes:

    alignas(32) int8_t  wbuf[128 * K0];          // K0 defined inside lambda
    alignas(32) int32_t sumbuf[SPAT_BLOCK_SIZE * K0];  // both defined inside lambda


### Fix
Move the combined size constants to function scope (before the lambda),
where they are true compile-time constants with no `this` involvement:

    constexpr int WBUF_SIZE   = 128 * 8;  // 128 * K0
    constexpr int SUMBUF_SIZE = 8 * 8;    // SPAT_BLOCK_SIZE * K0



### Related
Fixes Windows CI failure introduced by #29126.

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

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This commit is contained in:
Varun Jaiswal
2026-05-27 15:43:26 +05:30
committed by GitHub
parent bf0cf34963
commit dafe7cef97
1 changed files with 8 additions and 3 deletions
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modules/dnn/src/int8layers/conv2_int8_kernels.simd.hpp
+8 -3
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@@ -1163,6 +1163,9 @@ static void convInt8BlockDepthwise(const void* inp_, const void* residual_,
((planeblocks_ + nthreads * 4 - 1) / (nthreads * 4) + SB_TILE - 1) & ~(SB_TILE - 1));
int ntiles = (planeblocks_ + TILE - 1) / TILE;
int total_tasks = N * K1 * ntiles;
#if CV_AVX2 && (defined(__x86_64__) || defined(_M_X64))
constexpr int WBUF_SIZE = 128 * 8; // 128 * K0, K0=8; named for MSVC
#endif
parallel_for_(Range(0, total_tasks), [&](const Range& range) {
int H = H_, W = W_;
@@ -1193,9 +1196,8 @@ static void convInt8BlockDepthwise(const void* inp_, const void* residual_,
if (ksize <= 128) {
int n_g = g_end - g_start;
constexpr int SB = 8;
// Pre-gather weights for this group block into wbuf[ksize * K0].
alignas(32) int8_t wbuf[128 * K0];
alignas(32) int8_t wbuf[WBUF_SIZE];
for (int i = 0; i < ksize; i++) {
for (int j = 0; j < n_g; j++) {
int g = g_start + j;
@@ -1584,13 +1586,16 @@ void convInt8Block(const void* inp_, const void* residual_,
}
int total_blocks = N * ngroups * Kblk;
#if CV_AVX2
constexpr int SUMBUF_SIZE = 8 * 8; // SPAT_BLOCK_SIZE * K0, both=8; named for MSVC
#endif
parallel_for_(Range(0, total_blocks), [&](const Range& range) {
constexpr int C0 = 8, K0 = 8;
constexpr int C0shift = 3;
#if CV_AVX2
constexpr int SPAT_BLOCK_SIZE = 8;
alignas(32) int32_t sumbuf[SPAT_BLOCK_SIZE * K0];
alignas(32) int32_t sumbuf[SUMBUF_SIZE];
#endif
const uint8_t xor_val = inputIsU8 ? 0x80 : 0;