Unverified Commit b576a6b0 authored by Phoebe Wang's avatar Phoebe Wang Committed by GitHub
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[X86][AMX] Fix a bug after #83628 (#91207)

We need to check if `GR64Cand` a valid register before using it.

Test is not needed since it's covered in llvm-test-suite.

Fixes #90954
parent 4527adc5
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