2016-08-15 21:27:49 +08:00
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; RUN: opt %loadPolly -polly-scops -polly-invariant-load-hoisting=true -analyze < %s | FileCheck %s
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2016-04-23 22:32:34 +08:00
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;
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; Verify we do hoist the invariant access to I with a execution context
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; as the address computation might wrap in the original but not in our
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; optimized version. For an input of c = 127 the original accessed address
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; would be &I[-1] = &GI[128 -1] = &GI[127] but in our optimized version
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; (due to the usage of i64 types) we would access
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; &I[127 + 1] = &I[128] = &GI[256] which would here also be out-of-bounds.
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;
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; CHECK: Invariant Accesses: {
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; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
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; CHECK-NEXT: [c] -> { Stmt_for_body[i0] -> MemRef_GI[129 + c] };
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; CHECK-NEXT: Execution Context: [c] -> { : c <= 126 }
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; CHECK-NEXT: }
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;
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; int GI[256];
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; void f(int *A, unsigned char c) {
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; int *I = &GI[128];
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; for (int i = 0; i < 10; i++)
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; A[i] += I[(signed char)(c + (unsigned char)1)];
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; }
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;
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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@GI = common global [256 x i32] zeroinitializer, align 16
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define void @f(i32* %A, i8 zeroext %c) {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.inc, %entry
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%exitcond = icmp ne i64 %indvars.iv, 10
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br i1 %exitcond, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%add = add i8 %c, 1
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%idxprom = sext i8 %add to i64
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%arrayidx = getelementptr inbounds i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @GI, i64 0, i64 128), i64 %idxprom
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%tmp = load i32, i32* %arrayidx, align 4
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%arrayidx3 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
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%tmp1 = load i32, i32* %arrayidx3, align 4
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%add4 = add nsw i32 %tmp1, %tmp
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store i32 %add4, i32* %arrayidx3, align 4
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br label %for.inc
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for.inc: ; preds = %for.body
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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br label %for.cond
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for.end: ; preds = %for.cond
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ret void
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}
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