derek.holloway
7502bf64a4
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149 lines
4.8 KiB
LLVM
149 lines
4.8 KiB
LLVM
; RUN: opt -aa-pipeline=basic-aa -passes=loop-distribute -enable-loop-distribute -verify-loop-info -verify-dom-info -S \
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; RUN: < %s | FileCheck %s
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; RUN: opt -aa-pipeline=basic-aa -passes='loop-distribute,print<access-info>' -enable-loop-distribute \
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; RUN: -verify-loop-info -verify-dom-info -disable-output < %s 2>&1 | FileCheck %s --check-prefix=ANALYSIS
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; RUN: opt -aa-pipeline=basic-aa -passes=loop-distribute,loop-vectorize -enable-loop-distribute -force-vector-width=4 -S \
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; RUN: < %s | FileCheck %s --check-prefix=VECTORIZE
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; We should distribute this loop into a safe (2nd statement) and unsafe loop
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; (1st statement):
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; for (i = 0; i < n; i++) {
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; A[i + 1] = A[i] * B[i];
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; =======================
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; C[i] = D[i] * E[i];
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; }
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; CHECK-LABEL: @f(
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define void @f(ptr noalias %a, ptr noalias %b, ptr noalias %c, ptr noalias %d, ptr noalias %e) {
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entry:
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br label %for.body
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; Verify the two distributed loops.
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; CHECK: entry.split.ldist1:
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; CHECK: br label %for.body.ldist1
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; CHECK: for.body.ldist1:
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; CHECK: %mulA.ldist1 = mul i32 %loadB.ldist1, %loadA.ldist1
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; CHECK: br i1 %exitcond.ldist1, label %entry.split, label %for.body.ldist1
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; CHECK: entry.split:
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; CHECK: br label %for.body
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; CHECK: for.body:
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; CHECK: %mulC = mul i32 %loadD, %loadE
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; CHECK: for.end:
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; ANALYSIS: for.body.ldist1:
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; ANALYSIS-NEXT: Report: unsafe dependent memory operations in loop
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; ANALYSIS: for.body:
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; ANALYSIS-NEXT: Memory dependences are safe{{$}}
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; VECTORIZE: mul <4 x i32>
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for.body: ; preds = %for.body, %entry
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%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%arrayidxA = getelementptr inbounds i32, ptr %a, i64 %ind
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%loadA = load i32, ptr %arrayidxA, align 4
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%arrayidxB = getelementptr inbounds i32, ptr %b, i64 %ind
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%loadB = load i32, ptr %arrayidxB, align 4
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%mulA = mul i32 %loadB, %loadA
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%add = add nuw nsw i64 %ind, 1
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%arrayidxA_plus_4 = getelementptr inbounds i32, ptr %a, i64 %add
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store i32 %mulA, ptr %arrayidxA_plus_4, align 4
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%arrayidxD = getelementptr inbounds i32, ptr %d, i64 %ind
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%loadD = load i32, ptr %arrayidxD, align 4
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%arrayidxE = getelementptr inbounds i32, ptr %e, i64 %ind
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%loadE = load i32, ptr %arrayidxE, align 4
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%mulC = mul i32 %loadD, %loadE
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%arrayidxC = getelementptr inbounds i32, ptr %c, i64 %ind
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store i32 %mulC, ptr %arrayidxC, align 4
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%exitcond = icmp eq i64 %add, 20
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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declare i32 @llvm.convergent(i32) #0
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; It is OK to distribute with a convergent operation, since in each
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; new loop the convergent operation has the ssame control dependency.
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; CHECK-LABEL: @f_with_convergent(
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define void @f_with_convergent(ptr noalias %a, ptr noalias %b, ptr noalias %c, ptr noalias %d, ptr noalias %e) {
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entry:
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br label %for.body
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; Verify the two distributed loops.
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; CHECK: entry.split.ldist1:
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; CHECK: br label %for.body.ldist1
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; CHECK: for.body.ldist1:
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; CHECK: %mulA.ldist1 = mul i32 %loadB.ldist1, %loadA.ldist1
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; CHECK: br i1 %exitcond.ldist1, label %entry.split, label %for.body.ldist1
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; CHECK: entry.split:
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; CHECK: br label %for.body
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; CHECK: for.body:
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; CHECK: %convergentD = call i32 @llvm.convergent(i32 %loadD)
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; CHECK: %mulC = mul i32 %convergentD, %loadE
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; CHECK: for.end:
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; ANALYSIS: for.body.ldist1:
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; ANALYSIS-NEXT: Report: unsafe dependent memory operations in loop
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; ANALYSIS: for.body:
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; ANALYSIS-NEXT: Has convergent operation in loop
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; ANALYSIS-NEXT: Report: cannot add control dependency to convergent operation
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; convergent instruction happens to block vectorization
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; VECTORIZE: call i32 @llvm.convergent
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; VECTORIZE: mul i32
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for.body: ; preds = %for.body, %entry
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%ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
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%arrayidxA = getelementptr inbounds i32, ptr %a, i64 %ind
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%loadA = load i32, ptr %arrayidxA, align 4
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%arrayidxB = getelementptr inbounds i32, ptr %b, i64 %ind
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%loadB = load i32, ptr %arrayidxB, align 4
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%mulA = mul i32 %loadB, %loadA
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%add = add nuw nsw i64 %ind, 1
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%arrayidxA_plus_4 = getelementptr inbounds i32, ptr %a, i64 %add
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store i32 %mulA, ptr %arrayidxA_plus_4, align 4
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%arrayidxD = getelementptr inbounds i32, ptr %d, i64 %ind
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%loadD = load i32, ptr %arrayidxD, align 4
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%arrayidxE = getelementptr inbounds i32, ptr %e, i64 %ind
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%loadE = load i32, ptr %arrayidxE, align 4
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%convergentD = call i32 @llvm.convergent(i32 %loadD)
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%mulC = mul i32 %convergentD, %loadE
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%arrayidxC = getelementptr inbounds i32, ptr %c, i64 %ind
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store i32 %mulC, ptr %arrayidxC, align 4
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%exitcond = icmp eq i64 %add, 20
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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attributes #0 = { nounwind readnone convergent }
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