733ea34f38
This fixes PR27035. While we now exclude MemIntrinsics from the polyhedral model if they would access "null" we could exploit this even more, e.g., remove all parameter combinations that would lead to the execution of this statement from the context. llvm-svn: 264284
38 lines
1.5 KiB
LLVM
38 lines
1.5 KiB
LLVM
; RUN: opt %loadPolly -polly-allow-modref-calls -polly-scops -analyze < %s | FileCheck %s
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; RUN: opt %loadPolly -polly-allow-modref-calls -S -polly-codegen < %s
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;
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; Verify we can handle a memset to "null" and that we do not model it.
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; TODO: FIXME: We could use the undefined memset to optimize the code further,
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; see the TODOs in the ScopInfo.cpp.
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;
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; CHECK: Statements {
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; CHECK-NEXT: Stmt_for_cond5_preheader_us221
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; CHECK-NEXT: Domain :=
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; CHECK-NEXT: { Stmt_for_cond5_preheader_us221[0] };
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; CHECK-NEXT: Schedule :=
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; CHECK-NEXT: { Stmt_for_cond5_preheader_us221[i0] -> [0] };
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; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
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; CHECK-NEXT: { Stmt_for_cond5_preheader_us221[i0] -> MemRef_A[0] };
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; CHECK-NEXT: }
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;
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target datalayout = "e-m:e-i64:64-i128:128-n8:16:32:64-S128"
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define void @test(i32* %A) {
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entry:
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br i1 undef, label %for.end68, label %for.cond5.preheader.lr.ph
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for.cond5.preheader.lr.ph: ; preds = %entry
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br label %for.cond5.preheader.us221
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for.cond5.preheader.us221: ; preds = %for.cond5.preheader.us221, %for.cond5.preheader.lr.ph
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store i32 0, i32* %A
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call void @llvm.memset.p0i8.i64(i8* null, i8 0, i64 undef, i32 1, i1 false)
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br i1 true, label %for.end68, label %for.cond5.preheader.us221
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for.end68: ; preds = %for.cond5.preheader.us221, %entry
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ret void
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}
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1)
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