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[RISCV] Cost ordered bf16/f16 w/ zvfhmin reductions as invalid #114250

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[RISCV] Cost ordered bf16/f16 w/ zvfhmin reductions as invalid #114250

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Commits on Oct 30, 2024

  1. [RISCV] Cost ordered bf16/f16 w/ zvfhmin reductions as invalid 

    This moves the check earlier to fix this.

This also uses BasicTTIImpl instead which now assigns a valid but expensive cost for fixed-length vectors, which reflects how codegen will actually scalarize them.
    @lukel97
    lukel97 committed Oct 30, 2024
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  2. Check legalized type

    @lukel97
    lukel97 committed Oct 30, 2024
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