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66 lines
2.2 KiB
LLVM
66 lines
2.2 KiB
LLVM
; RUN: opt %loadPolly -polly-simplify -analyze < %s | FileCheck %s -match-full-lines
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;
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; Do not remove the scalar value write of %i.trunc in inner.for.
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; It is used by body.
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; %i.trunc is synthesizable in inner.for, so some code might think it is
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; synthesizable everywhere such that no scalar write would be needed.
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;
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; Note that -polly-simplify rightfully removes %inner.cond. It should
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; not have been added to the instruction list in the first place.
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;
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define void @func(i32 %n, i32* 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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%zero = sext i32 0 to i64
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br i1 %j.cmp, label %inner.for, label %exit
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; This loop has some unusual properties:
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; * It has a known iteration count (8), therefore SCoP-compatible.
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; * %i.trunc is synthesizable within the loop ({1,+,1}<%while.body>).
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; * %i.trunc is not synthesizable outside of the loop, because its value is
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; unknown when exiting.
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; (should be 8, but ScalarEvolution currently seems unable to derive that)
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;
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; ScalarEvolution currently seems to not able to handle the %zero.
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; If it becomes more intelligent, there might be other such loop constructs.
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inner.for:
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%i = phi i64 [%zero, %for], [%i.inc, %inner.for]
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%i.inc = add nuw nsw i64 %i, 1
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%i.trunc = trunc i64 %i.inc to i32
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%i.and = and i32 %i.trunc, 7
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%inner.cond = icmp eq i32 %i.and, 0
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br i1 %inner.cond, label %body, label %inner.for
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body:
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store i32 %i.trunc, i32* %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: After accesses {
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; CHECK-NEXT: Stmt_inner_for
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; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1]
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; CHECK-NEXT: [n] -> { Stmt_inner_for[i0, i1] -> MemRef_i_trunc[] };
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; CHECK-NEXT: Stmt_body
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; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
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; CHECK-NEXT: [n] -> { Stmt_body[i0] -> MemRef_A[0] };
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; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 1]
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; CHECK-NEXT: [n] -> { Stmt_body[i0] -> MemRef_i_trunc[] };
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; CHECK-NEXT: }
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