derek.holloway
7502bf64a4
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42 lines
1.5 KiB
LLVM
42 lines
1.5 KiB
LLVM
; RUN: llc -mtriple=amdgcn < %s | FileCheck %s
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; The branch instruction in LOOP49 has a uniform condition, but PHI instructions
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; introduced by the structurizecfg pass previously caused a false divergence
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; which ended up in an assertion (or incorrect code) because
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; SIAnnotateControlFlow and structurizecfg had different ideas about which
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; branches are uniform.
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;
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; CHECK-LABEL: {{^}}main:
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; CHECK: ; %LOOP49
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; CHECK: s_cmp_{{lg|eq}}_u32 s{{[0-9]+}}, 0
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; CHECK: s_cbranch_scc{{[0-1]}}
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; CHECK: ; %ENDIF53
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define amdgpu_vs float @main(i32 %in) {
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main_body:
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%cmp = mul i32 %in, 2
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br label %LOOP
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LOOP: ; preds = %ENDLOOP48, %main_body
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%counter = phi i32 [ 0, %main_body ], [ %counter.next, %ENDLOOP48 ]
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%v.LOOP = phi i32 [ 0, %main_body ], [ %v.ENDLOOP48, %ENDLOOP48 ]
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%tmp7 = icmp slt i32 %cmp, %counter
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br i1 %tmp7, label %IF, label %LOOP49
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IF: ; preds = %LOOP
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%r = bitcast i32 %v.LOOP to float
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ret float %r
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LOOP49: ; preds = %LOOP
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%tmp8 = icmp ne i32 %counter, 0
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br i1 %tmp8, label %ENDLOOP48, label %ENDIF53
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ENDLOOP48: ; preds = %ENDIF53, %LOOP49
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%v.ENDLOOP48 = phi i32 [ %v.LOOP, %LOOP49 ], [ %v.ENDIF53, %ENDIF53 ]
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%counter.next = add i32 %counter, 1
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br label %LOOP
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ENDIF53: ; preds = %LOOP49
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%v.ENDIF53 = add i32 %v.LOOP, %counter
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br label %ENDLOOP48
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}
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