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[llvm-exegesis] Exclude loads/stores from aliasing instruction set #156300

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Merged
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Sep 3, 2025
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[llvm-exegesis] Exclude loads/stores from aliasing instruction set #156300

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33f15e1
[llvm-exegesis] Exclude loads/stores from aliasing instruction set
sjoerdmeijer Sep 1, 2025
69032ba
Move checks to hasMemoryOperands()
sjoerdmeijer Sep 3, 2025
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8 changes: 8 additions & 0 deletions llvm/test/tools/llvm-exegesis/AArch64/no-aliasing-ld-str.s
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Original file line number Diff line number Diff line change
@@ -0,0 +1,8 @@
REQUIRES: aarch64-registered-target

RUN: llvm-exegesis -mtriple=aarch64 -mcpu=neoverse-v2 -mode=latency --dump-object-to-disk=%d --opcode-name=FMOVWSr --benchmark-phase=assemble-measured-code 2>&1
RUN: llvm-objdump -d %d > %t.s
RUN: FileCheck %s < %t.s

CHECK-NOT: ld{{[1-4]}}
CHECK-NOT: st{{[1-4]}}
2 changes: 2 additions & 0 deletions llvm/tools/llvm-exegesis/lib/SerialSnippetGenerator.cpp
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Expand Up @@ -57,6 +57,8 @@ computeAliasingInstructions(const LLVMState &State, const Instruction *Instr,
continue;
if (OtherInstr.hasMemoryOperands())
continue;
if (OtherInstr.Description.mayLoad() || OtherInstr.Description.mayStore())
continue;
if (!ET.allowAsBackToBack(OtherInstr))
continue;
if (Instr->hasAliasingRegistersThrough(OtherInstr, ForbiddenRegisters))
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