[Bug target/87507] IRA unnecessarily uses non-volatile registers during register assignment

bergner at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Wed Oct 3 19:03:00 GMT 2018


--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
So the register pair r7,r8 is free to assign to TImode pseudo 126 in
assign_hard_reg(), but its cost is 1000, while the cost of r30,r31 somehow
looks to be zero, so we choose it instead!?!?  Not sure how r30,r31 incorrectly
got a cost of zero.

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