derek.holloway
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45 lines
1.8 KiB
YAML
45 lines
1.8 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 6
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# RUN: llc -mtriple=x86_64-unknown-linux-gnu -run-pass=register-coalescer -verify-coalescing -o - %s | FileCheck %s
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# This test demonstrates a bug in RegisterCoalescer where LiveRange::overlaps()
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# is called on a register with an empty live interval, leading to a crash.
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# Overlapping check must be symmetric.
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#
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# The pattern needed to reproduce the crash:
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# 1. Copy A: %dst = COPY %src, where %dst is terminal (no other copy affinity)
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# 2. Copy B: %src = COPY %undef_reg, redefining %src from an undefined register
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# 3. %undef_reg has no definition (empty live interval)
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# 4. %undef_reg is non-terminal (appears in at least two copies)
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#
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---
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name: empty_interval_overlaps_crash
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tracksRegLiveness: true
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body: |
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bb.0:
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; Copy A: %1 = COPY %0 (SrcReg=%0, DstReg=%1)
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; %0 is undef here (no prior def). %1 is terminal (only non-copy use below).
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; CHECK-LABEL: name: empty_interval_overlaps_crash
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; CHECK: [[DEF:%[0-9]+]]:gr32 = IMPLICIT_DEF
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; CHECK-NEXT: [[DEF1:%[0-9]+]]:gr32 = IMPLICIT_DEF
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; CHECK-NEXT: [[ADD32rr:%[0-9]+]]:gr32 = ADD32rr [[DEF]], [[DEF1]], implicit-def dead $eflags
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; CHECK-NEXT: $eax = COPY [[ADD32rr]]
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; CHECK-NEXT: RET 0, implicit $eax
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%1:gr32 = COPY undef %0:gr32
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; Copy B: %0 = COPY %2 (SrcReg=%0 as destination)
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; applyTerminalRule for Copy A finds this, extracts OtherReg=%0,
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; sees OtherReg==SrcReg, swaps to OtherReg=%2.
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; %2 has no def -> empty interval -> crash in overlaps().
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%0:gr32 = COPY undef %2:gr32
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; Copy C: makes %2 non-terminal (two copy uses required)
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%3:gr32 = COPY undef %2:gr32
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; Non-copy uses to keep %1 and %3 alive
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%4:gr32 = ADD32rr %1, %3, implicit-def dead $eflags
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$eax = COPY %4
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RET 0, implicit $eax
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...
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