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  • Evan Cheng's avatar
    Coalescer should not delete extract_subreg, insert_subreg, and subreg_to_reg of · e0c53134
    Evan Cheng authored 
    physical registers. This is especially critical for the later two since they
start the live interval of a super-register. e.g.
%DO<def> = INSERT_SUBREG %D0<undef>, %S0<kill>, 1
If this instruction is eliminated, the register scavenger will not be happy as
D0 is not defined previously.
This fixes PR5055.

llvm-svn: 82968
    e0c53134
sink-hoist.ll 1.11 KiB