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AMDGPU/SI: Don't handle a loop if there is no loop at all for a terminator BB.

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Differential Revision: http://reviews.llvm.org/D22021

Reviewed by: arsenm

llvm-svn: 277073
This commit is contained in:
Changpeng Fang 2016-07-28 23:01:45 +00:00
parent a3eb4e328d
commit cefc6be193
2 changed files with 73 additions and 0 deletions
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2
lib/Target/AMDGPU/SIAnnotateControlFlow.cpp
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@ -331,6 +331,8 @@ void SIAnnotateControlFlow::handleLoop(BranchInst *Term) {
BasicBlock *BB = Term->getParent();
llvm::Loop *L = LI->getLoopFor(BB);
if (!L)
return;
BasicBlock *Target = Term->getSuccessor(1);
PHINode *Broken = PHINode::Create(Int64, 0, "", &Target->front());

71
test/CodeGen/AMDGPU/si-annotate-cf-noloop.ll Normal file
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@ -0,0 +1,71 @@
; RUN: opt -mtriple=amdgcn-- -S -structurizecfg -si-annotate-control-flow %s | FileCheck -check-prefix=OPT %s
; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
; OPT-LABEL: @annotate_unreachable_noloop(
; OPT-NOT: call i1 @llvm.amdgcn.loop
; GCN-LABEL: {{^}}annotate_unreachable_noloop:
; GCN: s_cbranch_vccnz
; GCN-NOT: s_endpgm
; GCN: .Lfunc_end0
define void @annotate_unreachable_noloop(<4 x float> addrspace(1)* noalias nocapture readonly %arg) #0 {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
br label %bb1
bb1: ; preds = %bb
%tmp2 = sext i32 %tmp to i64
%tmp3 = getelementptr inbounds <4 x float>, <4 x float> addrspace(1)* %arg, i64 %tmp2
%tmp4 = load <4 x float>, <4 x float> addrspace(1)* %tmp3, align 16
br i1 undef, label %bb5, label %bb3
bb3: ; preds = %bb1
%tmp6 = extractelement <4 x float> %tmp4, i32 2
%tmp7 = fcmp olt float %tmp6, 0.000000e+00
br i1 %tmp7, label %bb4, label %bb5 ; crash goes away if these are swapped
bb4: ; preds = %bb3
unreachable
bb5: ; preds = %bb3, %bb1
unreachable
}
; OPT-LABEL: @annotate_ret_noloop(
; OPT-NOT: call i1 @llvm.amdgcn.loop
; GCN-LABEL: {{^}}annotate_ret_noloop:
; GCN: s_and_b64 vcc
; GCN: s_cbranch_vccnz
; GCN: s_endpgm
; GCN: .Lfunc_end1
define void @annotate_ret_noloop(<4 x float> addrspace(1)* noalias nocapture readonly %arg) #0 {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
br label %bb1
bb1: ; preds = %bb
%tmp2 = sext i32 %tmp to i64
%tmp3 = getelementptr inbounds <4 x float>, <4 x float> addrspace(1)* %arg, i64 %tmp2
%tmp4 = load <4 x float>, <4 x float> addrspace(1)* %tmp3, align 16
br i1 undef, label %bb5, label %bb3
bb3: ; preds = %bb1
%tmp6 = extractelement <4 x float> %tmp4, i32 2
%tmp7 = fcmp olt float %tmp6, 0.000000e+00
br i1 %tmp7, label %bb4, label %bb5 ; crash goes away if these are swapped
bb4: ; preds = %bb3
ret void
bb5: ; preds = %bb3, %bb1
ret void
}
declare i32 @llvm.amdgcn.workitem.id.x() #1
attributes #0 = { nounwind }
attributes #1 = { nounwind readnone }