[PATCH] Tune for lakemont

[Yulia Koval]

Hi,

The patch below contains some tuning changes for Lakemont, introduced
by H.J. Lu. Bootstraped/regtested for Linux/x86_64. Ok for trunk?

        * gcc/config/i386/x86-tune.def (X86_TUNE_USE_BT): Enable
        for Lakemont.
        (X86_TUNE_ZERO_EXTEND_WITH_AND): Disable for Lakemont.

Julia

0001-gcc-config-i386-x86-tune.def-X86_TUNE_USE_BT-Enable.patch
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