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[llvm][sroa] Fixed failing assertion caused by no handling for {launder,strip}.invariant.group in AggLoadStoreRewriter #151574

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[llvm][sroa] Fixed failing assertion caused by no handling for {launder,strip}.invariant.group in AggLoadStoreRewriter #151574

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059b1bb
[llvm][sroa] Added test for `launder.invariant.group` inside of loop
Jul 31, 2025
1c2e217
[llvm][sroa] Added pass-through handling for launder/strip invariant …
Jul 31, 2025
a46f5fc
[llvm][sroa] Re-generated checks with update_test_check.py
Aug 1, 2025
a395765
Merge branch 'main' into sroa-launder
tommymcm Aug 1, 2025
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6 changes: 6 additions & 0 deletions llvm/lib/Transforms/Scalar/SROA.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4261,6 +4261,12 @@ class AggLoadStoreRewriter : public InstVisitor<AggLoadStoreRewriter, bool> {
enqueueUsers(SI);
return false;
}

bool visitIntrinsicInst(IntrinsicInst &II) {
if (II.isLaunderOrStripInvariantGroup())
enqueueUsers(II);
return false;
}
};

} // end anonymous namespace
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35 changes: 35 additions & 0 deletions llvm/test/Transforms/SROA/invariant-group.ll
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Expand Up @@ -155,6 +155,41 @@ define void @partial_promotion_of_alloca() {
ret void
}

define void @launder_in_loop() {
; CHECK-LABEL: @launder_in_loop(
; CHECK-NEXT: br label [[HEADER:%.*]]
; CHECK: header:
; CHECK-NEXT: br i1 true, label [[BODY:%.*]], label [[EXIT:%.*]]
; CHECK: body:
; CHECK-NEXT: [[STRUCT:%.*]] = call [[T:%.*]] @[[MAKE_T:[a-zA-Z0-9_$\"\\.-]*[a-zA-Z_$\"\\.-][a-zA-Z0-9_$\"\\.-]*]]()
; CHECK-NEXT: [[STRUCT_FCA_0_EXTRACT:%.*]] = extractvalue [[T]] [[STRUCT]], 0
; CHECK-NEXT: [[STRUCT_FCA_1_EXTRACT:%.*]] = extractvalue [[T]] [[STRUCT]], 1
; CHECK-NEXT: br label [[HEADER]]
; CHECK: exit:
; CHECK-NEXT: ret void
;
%struct_ptr = alloca %t, i64 1, align 4
br label %header

header:
br i1 true, label %body, label %exit

body: ; preds = %6
%struct_ptr_fresh = call ptr @llvm.launder.invariant.group.p0(ptr %struct_ptr)
%struct = call %t @make_t()
store %t %struct, ptr %struct_ptr_fresh, align 4, !invariant.group !0
%first_ptr = getelementptr %t, ptr %struct_ptr_fresh, i32 0, i32 0
%first = load i32, ptr %first_ptr, align 4
%second_ptr = getelementptr %t, ptr %struct_ptr_fresh, i32 0, i32 1
%second = load i32, ptr %second_ptr, align 4
br label %header

exit:
ret void
}

declare %t @make_t()

declare void @use(ptr)

!0 = !{}
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