forked from OSchip/llvm-project
82 lines
2.6 KiB
LLVM
82 lines
2.6 KiB
LLVM
; RUN: opt %loadPolly -polly-scops -analyze < %s | FileCheck %s
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;
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; This checks that the no-wraps checks will be computed fast as some example
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; already showed huge slowdowns even though the inbounds and nsw flags were
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; all in place.
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;
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; // Inspired by itrans8x8 in transform8x8.c from the ldecode benchmark.
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; void fast(char *A, char N, char M) {
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; for (char i = 0; i < 8; i++) {
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; short index0 = (short)(i + N);
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; #ifdef fast
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; short index1 = (index0 * 1) + (short)M;
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; #else
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; short index1 = (index0 * 16) + (short)M;
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; #endif
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; A[index1]++;
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; }
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; }
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;
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; CHECK: Function: fast
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; CHECK: Function: slow
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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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define void @fast(i8* %A, i8 %N, i8 %M) {
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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 i8 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%exitcond = icmp ne i8 %indvars.iv, 8
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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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%tmp3 = add nsw i8 %indvars.iv, %N
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%tmp3ext = sext i8 %tmp3 to i16
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;%mul = mul nsw i16 %tmp3ext, 16
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%Mext = sext i8 %M to i16
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%add2 = add nsw i16 %tmp3ext, %Mext
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%arrayidx = getelementptr inbounds i8, i8* %A, i16 %add2
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%tmp4 = load i8, i8* %arrayidx, align 4
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%inc = add nsw i8 %tmp4, 1
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store i8 %inc, i8* %arrayidx, 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 i8 %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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define void @slow(i8* %A, i8 %N, i8 %M) {
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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 i8 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
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%exitcond = icmp ne i8 %indvars.iv, 8
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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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%tmp3 = add nsw i8 %indvars.iv, %N
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%tmp3ext = sext i8 %tmp3 to i16
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%mul = mul nsw i16 %tmp3ext, 16
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%Mext = sext i8 %M to i16
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%add2 = add nsw i16 %mul, %Mext
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%arrayidx = getelementptr inbounds i8, i8* %A, i16 %add2
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%tmp4 = load i8, i8* %arrayidx, align 4
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%inc = add nsw i8 %tmp4, 1
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store i8 %inc, i8* %arrayidx, 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 i8 %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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