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Hi, Recently on trunk, the ovlaps list for a register got a dual entry on my target, which caused the RA to crash. Reg Subreg1 Subreg b Subreg2 Subreg b I have a register with two subregs that have subreg b in common. This causes the SuperReg to appear twice in the ovelaps list for Subreg b. As this causes a register allocator to crasch (it evicts a register, and then inremenets the *AliasI, but the data struct...

...r coalescing 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://li...

On May 11, 2012, at 6:35 AM, Jonas Paulsson <jonas.paulsson at ericsson.com> wrote: > Hi, > > Recently on trunk, the ovlaps list for a register got a dual entry on my target, which caused the RA to crash. > > Reg > Subreg1 > Subreg b > Subreg2 > Subreg b > > I have a register with two subregs that have subreg b in common. This causes the SuperReg to appear twice in the ovelaps list for Subreg b This should be fixed in r156629. /jakob -------------- next part -------------- An HTML attach...

...ng 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. Is this happening on trunk, or are you using an old version of LLVM? /jakob

...air::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? &gt...