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13037577f3
We now use LiveRangeCalc::extendToUses() instead of a specially designed algorithm in constructMainRangeFromSubranges(): - The original motivation for constructMainRangeFromSubranges() were differences between the main liverange and subranges because of hidden dead definitions. This case however cannot happen anymore with the DetectDeadLaneMasks pass in place. - It simplifies the code. - This fixes a longstanding bug where we did not properly create new SSA values on merging control flow (the MachineVerifier missed most of these cases). - Move constructMainRangeFromSubranges() to LiveIntervalAnalysis and LiveRangeCalc to better match the implementation/available helper functions. This re-applies r269016. The fixes from r270290 and r270259 should avoid the machine verifier problems this time. llvm-svn: 270291
33 lines
961 B
YAML
33 lines
961 B
YAML
# RUN: llc -march=amdgcn -run-pass liveintervals -verify-machineinstrs -o /dev/null -debug-only=regalloc %s 2>&1 | FileCheck %s
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# REQUIRES: asserts
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# We currently maintain a main liveness range which operates like a superset of
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# all subregister liveranges. We may need to create additional SSA values at
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# merge point in this main liverange even though none of the subregister
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# liveranges needed it.
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#
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# Should see three distinct value numbers:
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# CHECK: %vreg0 [{{.*}}:0)[{{.*}}:1)[{{.*}}:2) 0@{{[0-9]+[Berd]}} 1@{{[0-9]+[Berd]}} 2@{{[0-9]+B-phi}}
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--- |
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define void @test0() { ret void }
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...
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---
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name: test0
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registers:
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- { id: 0, class: sreg_64 }
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body: |
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bb.0:
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successors: %bb.1, %bb.2
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S_NOP 0, implicit-def undef %0:sub0
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S_CBRANCH_VCCNZ %bb.1, implicit undef %vcc
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S_BRANCH %bb.2
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bb.1:
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successors: %bb.2
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S_NOP 0, implicit-def %0:sub1
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S_NOP 0, implicit %0:sub1
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S_BRANCH %bb.2
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bb.2:
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S_NOP 0, implicit %0:sub0
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...
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