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75 lines
2.5 KiB
75 lines
2.5 KiB
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -march=amdgcn -mcpu=gfx900 -run-pass simple-register-coalescing -verify-machineinstrs -o - %s | FileCheck %s
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#
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# The failure occurs when the coalescer tries to removePartialRedundency() on the
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# "%2:vreg_64 = COPY %3" in bb.1. The coalescer tries to prune and extend each
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# subrange of %2, the subrange for %2.sub1 has a def location (in bb.2) in the
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# predecessor path 2->3->1. But for another predecessor path 0->4->1,
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# the subrange has only one undef location in bb.0. If we don't compute Undef set,
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# it will fail to find the reaching def for %2.sub1 in predecessor bb.4 and bb.0
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# and crash with error message:
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# "Use of $noreg does not have a corresponding definition on every path
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# LLVM ERROR: Use not jointly dominated by defs"
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---
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name: _amdgpu_ps_main
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alignment: 1
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tracksRegLiveness: true
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body: |
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; CHECK-LABEL: name: _amdgpu_ps_main
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; CHECK: bb.0:
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; CHECK: successors: %bb.2(0x40000000), %bb.4(0x40000000)
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; CHECK: liveins: $sgpr2, $sgpr3, $vgpr3
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; CHECK: [[COPY:%[0-9]+]]:sgpr_32 = COPY $sgpr2
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; CHECK: undef %1.sub0:vreg_64 = COPY [[COPY]]
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; CHECK: undef %2.sub0:vreg_64 = COPY [[COPY]]
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; CHECK: S_CBRANCH_VCCNZ %bb.2, implicit undef $vcc
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; CHECK: S_BRANCH %bb.4
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; CHECK: bb.1:
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; CHECK: successors: %bb.2(0x80000000)
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; CHECK: S_NOP 0, implicit %2.sub0
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; CHECK: bb.2:
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; CHECK: successors: %bb.3(0x04000000), %bb.2(0x7c000000)
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; CHECK: [[COPY1:%[0-9]+]]:vreg_64 = COPY %2
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; CHECK: %1.sub0:vreg_64 = COPY [[COPY1]].sub0
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; CHECK: %2:vreg_64 = COPY %1
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; CHECK: S_CBRANCH_EXECNZ %bb.2, implicit undef $exec
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; CHECK: S_BRANCH %bb.3
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; CHECK: bb.3:
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: %2:vreg_64 = COPY [[COPY1]]
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; CHECK: S_BRANCH %bb.1
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; CHECK: bb.4:
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: S_BRANCH %bb.1
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bb.0:
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liveins: $sgpr2, $sgpr3, $vgpr3
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%0:sgpr_32 = COPY $sgpr2
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undef %1.sub0:vreg_64 = COPY %0
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undef %2.sub0:vreg_64 = COPY %0
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S_CBRANCH_VCCNZ %bb.2, implicit undef $vcc
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S_BRANCH %bb.4
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bb.1:
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%2:vreg_64 = COPY %3
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S_NOP 0, implicit %2.sub0
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bb.2:
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successors: %bb.3(0x04000000), %bb.2(0x7c000000)
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%3:vreg_64 = COPY %2
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%1.sub0:vreg_64 = COPY %3.sub0
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%2:vreg_64 = COPY %1
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S_CBRANCH_EXECNZ %bb.2, implicit undef $exec
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S_BRANCH %bb.3
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bb.3:
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S_BRANCH %bb.1
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bb.4:
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%3:vreg_64 = COPY %2
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S_BRANCH %bb.1
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...
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