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https://github.com/RPCS3/llvm-mirror.git
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cbef44dc6b
Summary: There are cases where uniform branch conditions are computed in VGPRs, and we didn't correctly mark those as WQM. The stray change in basic-branch.ll is because invoking the LiveIntervals analysis leads to the detection of a dead register that would otherwise not be seen at -O0. This is a candidate for the 3.9 branch, as it fixes a possible hang. Reviewers: arsenm, tstellarAMD, mareko Subscribers: arsenm, llvm-commits, kzhuravl Differential Revision: https://reviews.llvm.org/D22673 llvm-svn: 277500
55 lines
1.5 KiB
LLVM
55 lines
1.5 KiB
LLVM
; RUN: llc -O0 -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCNNOOPT -check-prefix=GCN %s
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; RUN: llc -O0 -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=GCNNOOPT -check-prefix=GCN %s
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; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCNOPT -check-prefix=GCN %s
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; RUN: llc -march=amdgcn -mcpu=tonga -verify-machineinstrs < %s | FileCheck -check-prefix=GCNOPT -check-prefix=GCN %s
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; GCN-LABEL: {{^}}test_branch:
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; GCNNOOPT: v_writelane_b32
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; GCNNOOPT: v_writelane_b32
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; GCN: s_cbranch_scc1 [[END:BB[0-9]+_[0-9]+]]
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; GCN: ; BB#1
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; GCNNOOPT: v_readlane_b32
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; GCNNOOPT: v_readlane_b32
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; GCN: buffer_store_dword
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; GCN: s_endpgm
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; GCN: {{^}}[[END]]
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; GCN: s_endpgm
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define void @test_branch(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %in, i32 %val) #0 {
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%cmp = icmp ne i32 %val, 0
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br i1 %cmp, label %store, label %end
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store:
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store i32 222, i32 addrspace(1)* %out
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ret void
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end:
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ret void
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}
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; GCN-LABEL: {{^}}test_brcc_i1:
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; GCN: buffer_load_ubyte
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; GCN: v_and_b32_e32 v{{[0-9]+}}, 1,
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; GCN: v_cmp_eq_i32_e32 vcc,
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; GCN: s_cbranch_vccnz [[END:BB[0-9]+_[0-9]+]]
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; GCN: buffer_store_dword
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; GCN: s_endpgm
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; GCN: {{^}}[[END]]
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; GCN: s_endpgm
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define void @test_brcc_i1(i32 addrspace(1)* noalias %out, i32 addrspace(1)* noalias %in, i1 %val) #0 {
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%cmp0 = icmp ne i1 %val, 0
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br i1 %cmp0, label %store, label %end
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store:
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store i32 222, i32 addrspace(1)* %out
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ret void
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end:
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ret void
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}
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attributes #0 = { nounwind }
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