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...ing decisions (CoalescerPair::Partial = 0). For example, I have a super reg that has r20, r21, r22, and r23 physical registers. This super reg is the dest of a reg_sequence which generates 4 COPY MIs. The first COPY coalesces (merging into r20), but the vregs for r21-r23 (SUPER_RC:%vreg50:subreg1..subreg3) are never coalesced after that because doing so generates inteference on %vreg50, the "parent" super reg. Is there a way to work around this? It causes unnecessary copies. Thanks, Joe -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm....

...ons (CoalescerPair::Partial = 0). > > For example, I have a super reg that has r20, r21, r22, and r23 physical registers. This super reg is the dest of a reg_sequence which generates 4 COPY MIs. The first COPY coalesces (merging into r20), but the vregs for r21-r23 (SUPER_RC:%vreg50:subreg1..subreg3) are never coalesced after that because doing so generates inteference on %vreg50, the "parent" super reg. > > Is there a way to work around this? It causes unnecessary copies. Is this happening on trunk, or are you using an old version of LLVM? /jakob

...ial = 0). > > > > For example, I have a super reg that has r20, r21, r22, and r23 physical > registers. This super reg is the dest of a reg_sequence which generates 4 > COPY MIs. The first COPY coalesces (merging into r20), but the vregs for > r21-r23 (SUPER_RC:%vreg50:subreg1..subreg3) are never coalesced after that > because doing so generates inteference on %vreg50, the "parent" super reg. > > > > Is there a way to work around this? It causes unnecessary copies. > > Is this happening on trunk, or are you using an old version of LLVM? > > /j...