[Common] Blackwell skip condition for C++ grouped FP8 block-scaling tests

[denera]

Description

Corrected condition to skip grouped FP8 block-scaling tests on Blackwell+.

Type of change

• Documentation change (change only to the documentation, either a fix or a new content)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Infra/Build change
• Code refactoring

Checklist:

• I have read and followed the contributing guidelines
• The functionality is complete
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[greptile-apps]

Greptile Summary

This PR fixes the skip condition in the C++ grouped FP8 block-scaling test (test_cast_float8blockwise_grouped.cu) so the test only runs on Hopper (SM90–SM9x) architectures. Previously, only pre-Hopper hardware was excluded; the new condition also skips on Blackwell (SM100+), where the feature is not yet supported.

• The updated guard now reads < hopperComputeCapability || >= blackwellComputeCapability, restricting execution to Hopper-class devices only.
• The fix aligns with the identical pattern already used in the sister test test_dequantize_float8blockwise_grouped.cu (lines 82–83).

Confidence Score: 5/5

Safe to merge — the change is a one-line guard addition that prevents the test from running on Blackwell+ hardware where the feature is unsupported.

The fix is minimal, targeted, and directly mirrors the identical skip pattern already present in the sister test test_dequantize_float8blockwise_grouped.cu. The getDeviceComputeCapability() function is backed by a static cache, so calling it twice in the condition is free. No logic outside the skip guard is touched.

No files require special attention.

Important Files Changed

Filename	Overview
tests/cpp/operator/test_cast_float8blockwise_grouped.cu	Adds Blackwell skip condition to perform_test, matching the identical guard in the dequantize sister test and the caching-safe getDeviceComputeCapability() implementation.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[perform_test called] --> B{cc < hopperComputeCapability\ni.e., cc < 90}
    B -- Yes --> C[GTEST_SKIP\npre-Hopper hardware]
    B -- No --> D{cc >= blackwellComputeCapability\ni.e., cc >= 100}
    D -- Yes --> E[GTEST_SKIP\nBlackwell+ hardware\nnew condition added by PR]
    D -- No --> F[Run test\nHopper only: cc 90-99]

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flowchart TD
    A[perform_test called] --> B{cc < hopperComputeCapability\ni.e., cc < 90}
    B -- Yes --> C[GTEST_SKIP\npre-Hopper hardware]
    B -- No --> D{cc >= blackwellComputeCapability\ni.e., cc >= 100}
    D -- Yes --> E[GTEST_SKIP\nBlackwell+ hardware\nnew condition added by PR]
    D -- No --> F[Run test\nHopper only: cc 90-99]

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_{Reviews (1): Last reviewed commit: "fixing Blackwell skip condition for grou..." | Re-trigger Greptile}

[vthumbe1503]

LGTM