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[LoongArch] Add option for merge base offset pass #161063

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Merged
merged 1 commit into from
Sep 29, 2025
Merged

[LoongArch] Add option for merge base offset pass #161063

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7 changes: 6 additions & 1 deletion llvm/lib/Target/LoongArch/LoongArchTargetMachine.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,11 @@ static cl::opt<bool>
cl::desc("Enable the loop data prefetch pass"),
cl::init(false));

static cl::opt<bool>
EnableMergeBaseOffset("loongarch-enable-merge-offset",
cl::desc("Enable the merge base offset pass"),
cl::init(true), cl::Hidden);

static Reloc::Model getEffectiveRelocModel(const Triple &TT,
std::optional<Reloc::Model> RM) {
return RM.value_or(Reloc::Static);
Expand Down Expand Up @@ -214,7 +219,7 @@ void LoongArchPassConfig::addMachineSSAOptimization() {

void LoongArchPassConfig::addPreRegAlloc() {
addPass(createLoongArchPreRAExpandPseudoPass());
if (TM->getOptLevel() != CodeGenOptLevel::None)
if (TM->getOptLevel() != CodeGenOptLevel::None && EnableMergeBaseOffset)
addPass(createLoongArchMergeBaseOffsetOptPass());
}

Expand Down
24 changes: 24 additions & 0 deletions llvm/test/CodeGen/LoongArch/merge-offset-option.ll
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@@ -0,0 +1,24 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc --mtriple=loongarch64 -mattr=+d --relocation-model=static -O1 \
; RUN: < %s | FileCheck %s --check-prefix=MERGE
; RUN: llc --mtriple=loongarch64 -mattr=+d --relocation-model=static -O1 \
; RUN: --loongarch-enable-merge-offset=false < %s | FileCheck %s --check-prefix=NO_MERGE

@g = dso_local global i32 zeroinitializer, align 4

define void @foo() nounwind {
; MERGE-LABEL: foo:
; MERGE: # %bb.0:
; MERGE-NEXT: pcalau12i $a0, %pc_hi20(g)
; MERGE-NEXT: ld.w $zero, $a0, %pc_lo12(g)
; MERGE-NEXT: ret
;
; NO_MERGE-LABEL: foo:
; NO_MERGE: # %bb.0:
; NO_MERGE-NEXT: pcalau12i $a0, %pc_hi20(g)
; NO_MERGE-NEXT: addi.d $a0, $a0, %pc_lo12(g)
; NO_MERGE-NEXT: ld.w $zero, $a0, 0
; NO_MERGE-NEXT: ret
%v = load volatile i32, ptr @g
ret void
}