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134a572951
Scops that exit with an unreachable are today still permitted, but make little sense to optimize. We therefore can already skip them during scop detection. This speeds up scop detection in certain cases and also ensures that bugpoint does not introduce unreachables when reducing test cases. In practice this change should have little impact, as the performance of unreachable code is unlikely to matter. This commit is part of a series that makes Polly more robust in the presence of unreachables. llvm-svn: 297151
32 lines
827 B
LLVM
32 lines
827 B
LLVM
; RUN: opt %loadPolly -polly-detect -analyze < %s \
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; RUN: -pass-remarks-missed="polly-detect" 2>&1 | FileCheck %s
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; void f(long A[], long N) {
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; long i;
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; for (i = 0; i < N; ++i)
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; A[i] = i;
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; unreachable()
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; }
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
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define void @f(i64* %A, i64 %N) nounwind {
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entry:
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fence seq_cst
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br label %for.i
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for.i:
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%indvar = phi i64 [ 0, %entry ], [ %indvar.next, %for.i ]
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%scevgep = getelementptr i64, i64* %A, i64 %indvar
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store i64 %indvar, i64* %scevgep
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%indvar.next = add nsw i64 %indvar, 1
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%exitcond = icmp eq i64 %indvar.next, %N
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br i1 %exitcond, label %return, label %for.i
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return:
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fence seq_cst
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unreachable
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}
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; CHECK: Unreachable in exit block
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