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New virtual registers created for spill intervals should inherit allocation hints from the original register.
This helps us avoid silly copies when rematting values that are copied to a physical register: leaq _.str44(%rip), %rcx movq %rcx, %rsi call _strcmp becomes: leaq _.str44(%rip), %rsi call _strcmp The coalescer will not touch the movq because that would tie down the physical register. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90163 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1095,6 +1095,12 @@ rewriteInstructionForSpills(const LiveInterval &li, const VNInfo *VNI,
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NewVReg = mri_->createVirtualRegister(rc);
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vrm.grow();
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CreatedNewVReg = true;
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// The new virtual register should get the same allocation hints as the
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// old one.
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std::pair<unsigned, unsigned> Hint = mri_->getRegAllocationHint(Reg);
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if (Hint.first || Hint.second)
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mri_->setRegAllocationHint(NewVReg, Hint.first, Hint.second);
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}
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if (!TryFold)
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@ -1,4 +1,4 @@
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; RUN: llc < %s -mtriple=i386-apple-darwin -disable-fp-elim -stats |& grep asm-printer | grep 59
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; RUN: llc < %s -mtriple=i386-apple-darwin -disable-fp-elim -stats |& grep asm-printer | grep 58
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; PR2568
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@g_3 = external global i16 ; <i16*> [#uses=1]
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