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[RISCV] Add a test for multiple save locations of a callee-saved register #164479

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Merged
merged 2 commits into from
Nov 5, 2025
Merged

[RISCV] Add a test for multiple save locations of a callee-saved register #164479

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4f5d8e0
[RISCV] Add a test for multiple save locations of a CSR.
Apr 2, 2025
677121d
fixed a typo, improved wording.
Oct 21, 2025
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35 changes: 35 additions & 0 deletions llvm/test/CodeGen/RISCV/cfi-multiple-locations.mir
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Original file line number Diff line number Diff line change
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# RUN: llc %s -mtriple=riscv64 \
# RUN: -run-pass=cfi-instr-inserter \
# RUN: -riscv-enable-cfi-instr-inserter=true
# XFAIL: *

# Technically, it is possible that a callee-saved register is saved in multiple different locations.
# CFIInstrInserter should handle this, but currently it does not.
---
name: multiple_locations
tracksRegLiveness: true
body: |
bb.0.entry:
liveins: $x10, $x9, $x2
BEQ $x10, $x0, %bb.3
PseudoBR %bb.2

bb.1:
liveins: $x10, $x9, $x2
$x5 = COPY $x9
CFI_INSTRUCTION register $x9, $x5
$x9 = COPY $x5
CFI_INSTRUCTION register $x9, $x9
PseudoBR %bb.3

bb.2:
liveins: $x10, $x9, $x2
SD $x9, $x2, 0 :: (store (s64))
CFI_INSTRUCTION offset $x9, 0
$x9 = LD $x2, 0 :: (load (s64))
CFI_INSTRUCTION register $x9, $x9
PseudoBR %bb.3

bb.3:
PseudoRET
...