forked from OSchip/llvm-project
54 lines
1.1 KiB
LLVM
54 lines
1.1 KiB
LLVM
; RUN: opt %loadPolly -polly-stmt-granularity=bb -polly-simplify -analyze < %s | FileCheck %s -match-full-lines
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;
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; Remove a dead PHI write/read pair
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; (accesses that are effectively not used)
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;
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; for (int j = 0; j < n; j += 1) {
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; body:
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; double phi = 42;
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;
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; body_succ:
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; A[0] = 42.0;
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; }
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;
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define void @func(i32 %n, double* noalias nonnull %A) {
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entry:
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br label %for
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for:
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%j = phi i32 [0, %entry], [%j.inc, %inc]
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%j.cmp = icmp slt i32 %j, %n
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br i1 %j.cmp, label %body, label %exit
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body:
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br label %body_succ
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body_succ:
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%phi = phi double [42.0, %body]
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store double 42.0, double* %A
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br label %inc
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inc:
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%j.inc = add nuw nsw i32 %j, 1
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br label %for
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exit:
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br label %return
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return:
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ret void
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}
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; CHECK: Statistics {
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; CHECK: Dead accesses removed: 2
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; CHECK: Dead instructions removed: 1
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; CHECK: Stmts removed: 1
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; CHECK: }
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; CHECK: After accesses {
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; CHECK-NEXT: Stmt_body_succ
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; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
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; CHECK-NEXT: [n] -> { Stmt_body_succ[i0] -> MemRef_A[0] };
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; CHECK-NEXT: }
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