0446d81e2d
This new pass removes unnecessary accesses and writes. It currently supports 2 simplifications, but more are planned. It removes write accesses that write a loaded value back to the location it was loaded from. It is a typical artifact from DeLICM. Removing it will get rid of bogus dependencies later in dependency analysis. It also removes statements without side-effects. ScopInfo already removes these, but the removal of unnecessary writes can result in more side-effect free statements. Differential Revision: https://reviews.llvm.org/D30820 llvm-svn: 297473
34 lines
585 B
LLVM
34 lines
585 B
LLVM
; RUN: opt %loadPolly -polly-simplify -analyze < %s | FileCheck %s
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;
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; Simple test for the existence of the Simplify pass.
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;
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; for (int j = 0; j < n; j += 1)
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; A[0] = 0.0;
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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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store double 0.0, 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: SCoP could not be simplified
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