198 lines
7.0 KiB
LLVM
198 lines
7.0 KiB
LLVM
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; RUN: opt < %s -disable-output "-passes=print<ddg>" 2>&1 | FileCheck %s
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; CHECK-LABEL: 'DDG' for loop 'test1.for.body':
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; CHECK: Node Address:[[N1:0x[0-9a-f]*]]:pi-block
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; CHECK-NEXT:--- start of nodes in pi-block ---
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; CHECK: Node Address:[[N2:0x[0-9a-f]*]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %i.02 = phi i64 [ %inc, %test1.for.body ], [ 1, %test1.for.body.preheader ]
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N3:0x[0-9a-f]*]]
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; CHECK: Node Address:[[N3]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %inc = add i64 %i.02, 1
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N2]]
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; CHECK-NEXT:--- end of nodes in pi-block ---
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N4:0x[0-9a-f]*]]
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; CHECK-NEXT: [def-use] to [[N5:0x[0-9a-f]*]]
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; CHECK-NEXT: [def-use] to [[N6:0x[0-9a-f]*]]
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; CHECK-NEXT: [def-use] to [[N7:0x[0-9a-f]*]]
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; CHECK: Node Address:[[N7]]:multi-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %cmp = icmp ult i64 %inc, %sub
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; CHECK-NEXT: br i1 %cmp, label %test1.for.body, label %for.end.loopexit
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; CHECK-NEXT: Edges:none!
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; CHECK: Node Address:[[N6]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %arrayidx3 = getelementptr inbounds float, float* %a, i64 %i.02
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N8:0x[0-9a-f]*]]
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; CHECK: Node Address:[[N5]]:multi-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %sub1 = add i64 %i.02, -1
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; CHECK-NEXT: %arrayidx2 = getelementptr inbounds float, float* %a, i64 %sub1
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N8]]
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; CHECK: Node Address:[[N4]]:multi-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %arrayidx = getelementptr inbounds float, float* %b, i64 %i.02
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; CHECK-NEXT: %0 = load float, float* %arrayidx, align 4
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N8]]
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; CHECK: Node Address:[[N8]]:pi-block
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; CHECK-NEXT: --- start of nodes in pi-block ---
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; CHECK: Node Address:[[N9:0x[0-9a-f]*]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %1 = load float, float* %arrayidx2, align 4
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N10:0x[0-9a-f]*]]
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; CHECK: Node Address:[[N10]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %add = fadd float %0, %1
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N11:0x[0-9a-f]*]]
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; CHECK: Node Address:[[N11]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: store float %add, float* %arrayidx3, align 4
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [memory] to [[N9]]
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; CHECK-NEXT:--- end of nodes in pi-block ---
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; CHECK-NEXT: Edges:none!
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;; Loop-carried dependence requiring edge-reversal to expose a cycle
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;; in the graph.
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;; void test(unsigned long n, float * restrict a, float * restrict b) {
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;; for (unsigned long i = 1; i < n-1; i++)
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;; a[i] = b[i] + a[i-1];
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;; }
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define void @test1(i64 %n, float* noalias %a, float* noalias %b) {
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entry:
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%sub = add i64 %n, -1
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%cmp1 = icmp ult i64 1, %sub
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br i1 %cmp1, label %test1.for.body, label %for.end
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test1.for.body: ; preds = %entry, %test1.for.body
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%i.02 = phi i64 [ %inc, %test1.for.body ], [ 1, %entry ]
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%arrayidx = getelementptr inbounds float, float* %b, i64 %i.02
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%0 = load float, float* %arrayidx, align 4
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%sub1 = add i64 %i.02, -1
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%arrayidx2 = getelementptr inbounds float, float* %a, i64 %sub1
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%1 = load float, float* %arrayidx2, align 4
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%add = fadd float %0, %1
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%arrayidx3 = getelementptr inbounds float, float* %a, i64 %i.02
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store float %add, float* %arrayidx3, align 4
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%inc = add i64 %i.02, 1
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%cmp = icmp ult i64 %inc, %sub
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br i1 %cmp, label %test1.for.body, label %for.end
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for.end: ; preds = %test1.for.body, %entry
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ret void
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}
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; CHECK-LABEL: 'DDG' for loop 'test2.for.body':
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; CHECK: Node Address:[[N1:0x[0-9a-f]*]]:pi-block
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; CHECK-NEXT:--- start of nodes in pi-block ---
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; CHECK: Node Address:[[N2:0x[0-9a-f]*]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %i.02 = phi i64 [ %inc, %test2.for.body ], [ 1, %test2.for.body.preheader ]
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N3:0x[0-9a-f]*]]
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; CHECK: Node Address:[[N3]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %inc = add i64 %i.02, 1
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N2]]
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; CHECK-NEXT:--- end of nodes in pi-block ---
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N4:0x[0-9a-f]*]]
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; CHECK-NEXT: [def-use] to [[N5:0x[0-9a-f]*]]
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; CHECK-NEXT: [def-use] to [[N6:0x[0-9a-f]*]]
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; CHECK-NEXT: [def-use] to [[N7:0x[0-9a-f]*]]
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; CHECK: Node Address:[[N7]]:multi-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %cmp = icmp ult i64 %inc, %sub
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; CHECK-NEXT: br i1 %cmp, label %test2.for.body, label %for.end.loopexit
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; CHECK-NEXT: Edges:none!
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; CHECK: Node Address:[[N6]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %arrayidx3 = getelementptr inbounds float, float* %a, i64 %i.02
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N8:0x[0-9a-f]*]]
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; CHECK: Node Address:[[N5]]:multi-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %add1 = add i64 %i.02, 1
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; CHECK-NEXT: %arrayidx2 = getelementptr inbounds float, float* %a, i64 %add1
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; CHECK-NEXT: %1 = load float, float* %arrayidx2, align 4
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N9:0x[0-9a-f]*]]
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; CHECK-NEXT: [memory] to [[N8]]
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; CHECK: Node Address:[[N4]]:multi-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %arrayidx = getelementptr inbounds float, float* %b, i64 %i.02
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; CHECK-NEXT: %0 = load float, float* %arrayidx, align 4
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N9]]
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; CHECK: Node Address:[[N9]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: %add = fadd float %0, %1
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; CHECK-NEXT: Edges:
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; CHECK-NEXT: [def-use] to [[N8]]
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; CHECK: Node Address:[[N8]]:single-instruction
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; CHECK-NEXT: Instructions:
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; CHECK-NEXT: store float %add, float* %arrayidx3, align 4
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; CHECK-NEXT: Edges:none!
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;; Forward loop-carried dependence *not* causing a cycle.
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;; void test2(unsigned long n, float * restrict a, float * restrict b) {
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;; for (unsigned long i = 1; i < n-1; i++)
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;; a[i] = b[i] + a[i+1];
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;; }
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define void @test2(i64 %n, float* noalias %a, float* noalias %b) {
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entry:
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%sub = add i64 %n, -1
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%cmp1 = icmp ult i64 1, %sub
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br i1 %cmp1, label %test2.for.body, label %for.end
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test2.for.body: ; preds = %entry, %test2.for.body
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%i.02 = phi i64 [ %inc, %test2.for.body ], [ 1, %entry ]
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%arrayidx = getelementptr inbounds float, float* %b, i64 %i.02
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%0 = load float, float* %arrayidx, align 4
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%add1 = add i64 %i.02, 1
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%arrayidx2 = getelementptr inbounds float, float* %a, i64 %add1
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%1 = load float, float* %arrayidx2, align 4
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%add = fadd float %0, %1
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%arrayidx3 = getelementptr inbounds float, float* %a, i64 %i.02
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store float %add, float* %arrayidx3, align 4
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%inc = add i64 %i.02, 1
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%cmp = icmp ult i64 %inc, %sub
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br i1 %cmp, label %test2.for.body, label %for.end
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for.end: ; preds = %test2.for.body, %entry
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ret void
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}
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