forked from OSchip/llvm-project
89 lines
2.2 KiB
LLVM
89 lines
2.2 KiB
LLVM
; RUN: opt %loadPolly -polly-print-delicm -disable-output < %s | FileCheck %s
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;
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; void func(double *A) {
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; for (int j = 0; j < 2; j += 1) { /* outer */
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; double phi = 0.0;
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; for (int i = 0; i < 4; i += 1) /* reduction */
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; if (phi < 0.0)
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; A[j] = undef;
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; phi += 4.2;
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; A[j] = phi;
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; }
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; }
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;
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; The MAY_WRITE in reduction.for.true conflict with a write of %phi to
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; A[j] if %phi would be mapped to it. Being a MAY_WRITE avoids being target
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; of a mapping itself.
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;
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; TODO: There is actually no reason why these conflict. The MAY_WRITE is an
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; explicit write, defined to occur always before all implicit writes as the
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; write of %phi would be. There is currently no differentiation between
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; implicit and explicit writes in Polly.
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;
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define void @func(double* noalias nonnull %A) {
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entry:
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%fsomeval = fadd double 21.0, 21.0
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br label %outer.preheader
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outer.preheader:
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br label %outer.for
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outer.for:
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%j = phi i32 [0, %outer.preheader], [%j.inc, %outer.inc]
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%j.cmp = icmp slt i32 %j, 2
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br i1 %j.cmp, label %reduction.preheader, label %outer.exit
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reduction.preheader:
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br label %reduction.for
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reduction.for:
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%i = phi i32 [0, %reduction.preheader], [%i.inc, %reduction.inc]
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%phi = phi double [0.0, %reduction.preheader], [%add, %reduction.inc]
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%A_idx = getelementptr inbounds double, double* %A, i32 %j
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%phi.cmp = fcmp ogt double %phi, 0.0
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br i1 %phi.cmp, label %reduction.for.true, label %reduction.for.unconditional
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reduction.for.true:
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store double undef, double* %A_idx
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br label %reduction.for.unconditional
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reduction.for.unconditional:
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%i.cmp = icmp slt i32 %i, 4
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br i1 %i.cmp, label %body, label %reduction.exit
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body:
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%add = fadd double %phi, 4.2
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br label %reduction.inc
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reduction.inc:
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%i.inc = add nuw nsw i32 %i, 1
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br label %reduction.for
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reduction.exit:
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store double %phi, double* %A_idx
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br label %outer.inc
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outer.inc:
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%j.inc = add nuw nsw i32 %j, 1
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br label %outer.for
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outer.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: Compatible overwrites: 1
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; CHECK: }
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; CHECK: No modification has been made
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