forked from OSchip/llvm-project
40 lines
1.7 KiB
LLVM
40 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine --instcombine-max-iterations=0 -S | FileCheck %s --check-prefix=ZERO
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; RUN: opt < %s -instcombine --instcombine-max-iterations=1 -S | FileCheck %s --check-prefix=ONE
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; RUN: opt < %s -instcombine -S | FileCheck %s --check-prefix=FIXPOINT
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; RUN: not --crash opt < %s -instcombine -S --instcombine-infinite-loop-threshold=2 2>&1 | FileCheck %s --check-prefix=LOOP
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; Based on builtin-dynamic-object-size.ll. This requires multiple iterations of
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; InstCombine to reach a fixpoint.
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define i64 @weird_identity_but_ok(i64 %sz) {
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; ZERO-LABEL: @weird_identity_but_ok(
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; ZERO-NEXT: entry:
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; ZERO-NEXT: [[CALL:%.*]] = tail call i8* @malloc(i64 [[SZ:%.*]])
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; ZERO-NEXT: [[CALC_SIZE:%.*]] = tail call i64 @llvm.objectsize.i64.p0i8(i8* [[CALL]], i1 false, i1 true, i1 true)
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; ZERO-NEXT: tail call void @free(i8* [[CALL]])
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; ZERO-NEXT: ret i64 [[CALC_SIZE]]
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;
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; ONE-LABEL: @weird_identity_but_ok(
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; ONE-NEXT: entry:
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; ONE-NEXT: [[TMP0:%.*]] = sub i64 [[SZ:%.*]], 0
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; ONE-NEXT: [[TMP1:%.*]] = icmp ult i64 [[SZ]], 0
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; ONE-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i64 0, i64 [[TMP0]]
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; ONE-NEXT: ret i64 [[TMP2]]
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;
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; FIXPOINT-LABEL: @weird_identity_but_ok(
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; FIXPOINT-NEXT: entry:
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; FIXPOINT-NEXT: ret i64 [[SZ:%.*]]
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;
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; LOOP: LLVM ERROR: Instruction Combining seems stuck in an infinite loop after 2 iterations.
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entry:
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%call = tail call i8* @malloc(i64 %sz)
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%calc_size = tail call i64 @llvm.objectsize.i64.p0i8(i8* %call, i1 false, i1 true, i1 true)
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tail call void @free(i8* %call)
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ret i64 %calc_size
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}
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declare i64 @llvm.objectsize.i64.p0i8(i8*, i1, i1, i1)
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declare i8* @malloc(i64)
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declare void @free(i8*)
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