derek.holloway
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73 lines
2.6 KiB
LLVM
73 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=tailcallelim -verify-dom-info -S | FileCheck %s
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; IR for that test was generated from the following C++ source:
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;
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;int count;
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;__attribute__((noinline)) void globalIncrement(const int* param) { count += *param; }
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;
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;void test(int recurseCount)
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;{
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; if (recurseCount == 0) return;
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; int temp = 10;
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; globalIncrement(&temp);
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; test(recurseCount - 1);
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;}
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;
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@count = dso_local local_unnamed_addr global i32 0, align 4
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; Function Attrs: nofree noinline norecurse nounwind uwtable
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declare void @_Z15globalIncrementPKi(ptr nocapture readonly %param) #0
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; Test that TRE could be done for recursive tail routine containing
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; call to function receiving a pointer to local stack.
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; Function Attrs: nounwind uwtable
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define dso_local void @_Z4testi(i32 %recurseCount) local_unnamed_addr #1 {
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; CHECK-LABEL: @_Z4testi(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TEMP:%.*]] = alloca i32, align 4
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; CHECK-NEXT: br label [[TAILRECURSE:%.*]]
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; CHECK: tailrecurse:
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; CHECK-NEXT: [[RECURSECOUNT_TR:%.*]] = phi i32 [ [[RECURSECOUNT:%.*]], [[ENTRY:%.*]] ], [ [[SUB:%.*]], [[IF_END:%.*]] ]
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[RECURSECOUNT_TR]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[RETURN:%.*]], label [[IF_END]]
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; CHECK: if.end:
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; CHECK-NEXT: call void @llvm.lifetime.start.p0(ptr nonnull [[TEMP]])
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; CHECK-NEXT: store i32 10, ptr [[TEMP]], align 4
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; CHECK-NEXT: call void @_Z15globalIncrementPKi(ptr nonnull [[TEMP]])
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; CHECK-NEXT: [[SUB]] = add nsw i32 [[RECURSECOUNT_TR]], -1
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; CHECK-NEXT: call void @llvm.lifetime.end.p0(ptr nonnull [[TEMP]])
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; CHECK-NEXT: br label [[TAILRECURSE]]
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; CHECK: return:
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; CHECK-NEXT: ret void
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;
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entry:
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%temp = alloca i32, align 4
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%cmp = icmp eq i32 %recurseCount, 0
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br i1 %cmp, label %return, label %if.end
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if.end: ; preds = %entry
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call void @llvm.lifetime.start.p0(ptr nonnull %temp) #6
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store i32 10, ptr %temp, align 4
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call void @_Z15globalIncrementPKi(ptr nonnull %temp)
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%sub = add nsw i32 %recurseCount, -1
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call void @_Z4testi(i32 %sub)
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call void @llvm.lifetime.end.p0(ptr nonnull %temp) #6
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br label %return
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return: ; preds = %entry, %if.end
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ret void
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}
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.start.p0(ptr nocapture) #2
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; Function Attrs: argmemonly nounwind willreturn
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declare void @llvm.lifetime.end.p0(ptr nocapture) #2
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attributes #0 = { nofree noinline norecurse nounwind uwtable }
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attributes #1 = { nounwind uwtable }
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attributes #2 = { argmemonly nounwind willreturn }
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