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96 lines
2.4 KiB
96 lines
2.4 KiB
4 months ago
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# RUN: llc -mtriple amdgcn -run-pass livevars -run-pass phi-node-elimination -o - %s | FileCheck %s
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################################################################################
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# This test used to hit an assert in PHIElimination:
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# PHIElimination::LowerPHINode(llvm::MachineBasicBlock&, llvm::MachineBasicBlock::iterator): Assertion `KillInst->readsRegister(SrcReg) && "Cannot find kill instruction"'
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---
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name: foo
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tracksRegLiveness: true
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body: |
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bb.0:
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S_CBRANCH_SCC0 %bb.2, implicit undef $scc
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bb.1:
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%1:sreg_32_xm0 = S_MOV_B32 255
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S_BRANCH %bb.3
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bb.2:
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%2:sreg_32_xm0 = S_MOV_B32 254
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bb.3:
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dead %3:sreg_32_xm0 = PHI undef %2, %bb.2, undef %1, %bb.1
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%4:sreg_32_xm0 = PHI %2, %bb.2, %1, %bb.1
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S_NOP 0, implicit %4
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...
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# CHECK-LABEL: name: foo
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# CHECK: bb.3:
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# CHECK-NEXT: dead %2:sreg_32_xm0 = IMPLICIT_DEF
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# CHECK-NEXT: %3:sreg_32_xm0 = COPY killed %4
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# CHECK-NEXT: S_NOP 0, implicit killed %3
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################################################################################
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# Similar test as above, but with swapped order for the PHI nodes.
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# With this PHI node order we did not hit the assert, but we used to get
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#
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# bb.3:
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# dead %3:sreg_32_xm0 = COPY killed %4
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# %2:sreg_32_xm0 = COPY %4
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# S_NOP 0, implicit killed %2
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#
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# which looks weird regarding killed flags for %4.
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---
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name: bar
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tracksRegLiveness: true
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body: |
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bb.0:
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S_CBRANCH_SCC0 %bb.2, implicit undef $scc
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bb.1:
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%1:sreg_32_xm0 = S_MOV_B32 255
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S_BRANCH %bb.3
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bb.2:
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%2:sreg_32_xm0 = S_MOV_B32 254
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bb.3:
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%4:sreg_32_xm0 = PHI %2, %bb.2, %1, %bb.1
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dead %3:sreg_32_xm0 = PHI undef %2, %bb.2, undef %1, %bb.1
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S_NOP 0, implicit %4
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...
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# CHECK-LABEL: name: bar
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# CHECK: bb.3:
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# CHECK-NEXT: dead %3:sreg_32_xm0 = IMPLICIT_DEF
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# CHECK-NEXT: %2:sreg_32_xm0 = COPY killed %4
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# CHECK-NEXT: S_NOP 0, implicit killed %2
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# The following test crashes in phi-elimination hooks.
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#
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---
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name: bax
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tracksRegLiveness: true
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body: |
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bb.0:
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S_CBRANCH_SCC0 %bb.2, implicit undef $scc
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bb.1:
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%1:sreg_32_xm0 = S_MOV_B32 255
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S_BRANCH %bb.3
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bb.2:
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%2:sreg_32_xm0 = S_MOV_B32 254
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bb.3:
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%3:sreg_32_xm0 = PHI %2, %bb.2, %1, %bb.1
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...
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# CHECK-LABEL: name: bax
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# CHECK: bb.3:
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# CHECK-NEXT: %2:sreg_32_xm0 = COPY killed %3
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