derek.holloway
7502bf64a4
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54 lines
1.9 KiB
LLVM
54 lines
1.9 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -passes=loop-fusion -disable-output -stats < %s 2>&1 | FileCheck -check-prefix=STAT %s
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; STAT: 1 loop-fusion - Loops fused
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; C Code
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;
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;; for (i = 0; i < n; i++)
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;; array2[i] = array1[i] * 2;
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;; for (i = 0; i < n; i++)
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;; if (array1[i] % 2 == 0)
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;; array2[i] = array1[i] * array1[i];
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; Loop fusion should not crash due to incorrect cached SCEV values as now
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; forgetLoop() is used to reset them after the fusion.
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define dso_local noundef i32 @forget_induction_scev(ptr noalias %array1, ptr noalias %array2) {
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entry:
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br label %for.body
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for.body:
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%indvars.iv54 = phi i64 [ %indvars.iv.next55, %for.body ], [ 0, %entry ]
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%arrayidx6 = getelementptr inbounds i32, ptr %array1, i64 %indvars.iv54
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%0 = load i32, ptr %arrayidx6, align 4
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%mul = shl nsw i32 %0, 1
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%arrayidx8 = getelementptr inbounds i32, ptr %array2, i64 %indvars.iv54
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store i32 %mul, ptr %arrayidx8, align 4
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%indvars.iv.next55 = add nuw nsw i64 %indvars.iv54, 1
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%exitcond57.not = icmp eq i64 %indvars.iv.next55, 1024
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br i1 %exitcond57.not, label %for.body14, label %for.body
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for.body14:
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%indvars.iv58 = phi i64 [ %indvars.iv.next59, %for.inc26 ], [ 0, %for.body ]
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%arrayidx16 = getelementptr inbounds i32, ptr %array1, i64 %indvars.iv58
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%1 = load i32, ptr %arrayidx16, align 4
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%2 = and i32 %1, 1
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%cmp18 = icmp eq i32 %2, 0
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br i1 %cmp18, label %if.then, label %for.inc26
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if.then:
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%mul23 = mul nsw i32 %1, %1
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%arrayidx25 = getelementptr inbounds i32, ptr %array2, i64 %indvars.iv58
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store i32 %mul23, ptr %arrayidx25, align 4
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br label %for.inc26
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for.inc26:
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%indvars.iv.next59 = add nuw nsw i64 %indvars.iv58, 1
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%exitcond61.not = icmp eq i64 %indvars.iv.next59, 1024
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br i1 %exitcond61.not, label %for.end28, label %for.body14
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for.end28:
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%arrayidx30 = getelementptr inbounds i8, ptr %array2, i64 4092
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%3 = load i32, ptr %arrayidx30, align 4
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ret i32 %3
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}
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