Hi all, This patch series adds and fixes two selftests in the arm64 hwcap test suite.
Patch 1/2 implements the cmpbr_sigill() test to correctly detect the presence of the CMPBR extension. The test uses the CBEQ instruction, which is valid only if the CPU supports the extension. If supported, a branch is taken and the UDF instruction is skipped, avoiding a SIGILL. Otherwise, the UDF is executed and a SIGILL is generated. Patch 2/2 fixes the sve2p1_sigill() test to correctly detect the FEAT_SVE2p1 feature. Previously, the test incorrectly assumed that the presence of FEAT_SVE2.1 implied support for the BFADD instruction, which actually depends on the FEAT_SVE_B16B16 feature. The test is updated to use the LD1Q instruction, which is unambiguously implied by FEAT_SVE2p1. These changes improve the accuracy and reliability of the selftests for arm64 hardware capability detection. References: CBEQ: https://developer.arm.com/documentation/ddi0602/2025-12/Base-Instructions/CB-cc---register---Compare-registers-and-branch-?lang=en BFADD: https://developer.arm.com/documentation/ddi0602/2025-12/SVE-Instructions/BFADD--unpredicated---BFloat16-add--unpredicated--?lang=en LD1Q: https://developer.arm.com/documentation/ddi0602/2025-12/SVE-Instructions/LD1Q--Gather-load-quadwords-?lang=en ID_AA64ZFR0_EL1: https://developer.arm.com/documentation/ddi0601/2025-03/AArch64-Registers/ID-AA64ZFR0-EL1--SVE-Feature-ID-Register-0?lang=en Yifan Wu (2): selftests/arm64: Implement cmpbr_sigill() to hwcap test selftest/arm64: Fix sve2p1_sigill() to hwcap test tools/testing/selftests/arm64/abi/hwcap.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) -- 2.33.0
