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[Fix] Dead statements should not confuse the RTC generation
This fixes http://llvm.org/bugs/show_bug.cgi?id=21166 . Differential Revision: http://reviews.llvm.org/D5623 llvm-svn: 219131
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Johannes Doerfert
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Oct 6, 2014
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,53 @@ | ||
; RUN: opt %loadPolly -polly-codegen-scev -polly-code-generator=isl -analyze -polly-scops < %s | FileCheck %s | ||
; | ||
; Check that RTC generation does not die when accesses are dead. | ||
; | ||
; CHECK: Alias Groups (0): | ||
; | ||
; void jd(int *A, int *B) { | ||
; for (int i = 0; i < 1024; i++) | ||
; for (int j = i; j < 0; j++) | ||
; A[i] = B[i]; | ||
; } | ||
; | ||
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" | ||
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define void @jd(i32* %A, i32* %B) { | ||
entry: | ||
br label %for.cond | ||
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for.cond: ; preds = %for.inc6, %entry | ||
%indvars.iv = phi i64 [ %indvars.iv.next, %for.inc6 ], [ 0, %entry ] | ||
%exitcond = icmp ne i64 %indvars.iv, 1024 | ||
br i1 %exitcond, label %for.body, label %for.end8 | ||
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for.body: ; preds = %for.cond | ||
%tmp = trunc i64 %indvars.iv to i32 | ||
br label %for.cond1 | ||
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for.cond1: ; preds = %for.inc, %for.body | ||
%j.0 = phi i32 [ %tmp, %for.body ], [ %inc, %for.inc ] | ||
%cmp2 = icmp slt i32 %j.0, 0 | ||
br i1 %cmp2, label %for.body3, label %for.end | ||
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for.body3: ; preds = %for.cond1 | ||
%arrayidx = getelementptr inbounds i32* %B, i64 %indvars.iv | ||
%tmp1 = load i32* %arrayidx, align 4 | ||
%arrayidx5 = getelementptr inbounds i32* %A, i64 %indvars.iv | ||
store i32 %tmp1, i32* %arrayidx5, align 4 | ||
br label %for.inc | ||
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for.inc: ; preds = %for.body3 | ||
%inc = add nsw i32 %j.0, 1 | ||
br label %for.cond1 | ||
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for.end: ; preds = %for.cond1 | ||
br label %for.inc6 | ||
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for.inc6: ; preds = %for.end | ||
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 | ||
br label %for.cond | ||
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for.end8: ; preds = %for.cond | ||
ret void | ||
} |