c4d256a590
Detailed description:
After https://reviews.llvm.org/D59990 submit several issues were discovered.
Changes in common code were preserved but AMDGPU specific part was reverted to keep the backend working correctly.
Discovered issues were addressed in the following commits:
https://reviews.llvm.org/D67662
https://reviews.llvm.org/D67101
https://reviews.llvm.org/D63953
https://reviews.llvm.org/D63731
This change brings back AMDGPU specific changes.
Reviewed by: rampitec, arsenm
Differential Revision: https://reviews.llvm.org/D68635
llvm-svn: 374767
42 lines
1.5 KiB
LLVM
42 lines
1.5 KiB
LLVM
; RUN: llc -march=amdgcn -verify-machineinstrs < %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_u32 s{{[0-9]+}}, 0
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; CHECK: s_cbranch_scc1
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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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