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llvm-project/llvm/test/CodeGen/AMDGPU/infinite-loop.ll

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Enable FeatureFlatForGlobal on Volcanic Islands This switches to the workaround that HSA defaults to for the mesa path. This should be applied to the 4.0 branch. Patch by Vedran Miletić <vedran@miletic.net> llvm-svn: 292982
2017-01-25 06:02:15 +08:00
; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=SI %s
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
; RUN: opt -mtriple=amdgcn-- -S -amdgpu-unify-divergent-exit-nodes -verify %s | FileCheck -check-prefix=IR %s
R600/SI: Fix assertion on infinite loops. This isn't the most useful case to fix in the real world, but bugpoint runs into this. llvm-svn: 201177
2014-02-12 05:12:38 +08:00
R600: Call EmitFunctionHeader() in the AsmPrinter to populate the ELF symbol table llvm-svn: 218776
2014-10-02 01:15:17 +08:00
; SI-LABEL: {{^}}infinite_loop:
R600/SI: Change all instruction assembly names to lowercase. This matches the format produced by the AMD proprietary driver. //==================================================================// // Shell script for converting .ll test cases: (Pass the .ll files you want to convert to this script as arguments). //==================================================================// ; This was necessary on my system so that A-Z in sed would match only ; upper case. I'm not sure why. export LC_ALL='C' TEST_FILES="$*" MATCHES=`grep -v Patterns SIInstructions.td | grep -o '"[A-Z0-9_]\+["e]' | grep -o '[A-Z0-9_]\+' | sort -r` for f in $TEST_FILES; do # Check that there are SI tests: grep -q -e 'verde' -e 'bonaire' -e 'SI' -e 'tahiti' $f if [ $? -eq 0 ]; then for match in $MATCHES; do sed -i -e "s/\([ :]$match\)/\L\1/" $f done # Try to get check lines with partial instruction names sed -i 's/\(;[ ]*SI[A-Z\\-]*: \)\([A-Z_0-9]\+\)/\1\L\2/' $f fi done sed -i -e 's/bb0_1/BB0_1/g' ../../../test/CodeGen/R600/infinite-loop.ll sed -i -e 's/SI-NOT: bfe/SI-NOT: {{[^@]}}bfe/g'../../../test/CodeGen/R600/llvm.AMDGPU.bfe.*32.ll ../../../test/CodeGen/R600/sext-in-reg.ll sed -i -e 's/exp_IEEE/EXP_IEEE/g' ../../../test/CodeGen/R600/llvm.exp2.ll sed -i -e 's/numVgprs/NumVgprs/g' ../../../test/CodeGen/R600/register-count-comments.ll sed -i 's/\(; CHECK[-NOT]*: \)\([A-Z_0-9]\+\)/\1\L\2/' ../../../test/CodeGen/R600/select64.ll ../../../test/CodeGen/R600/sgpr-copy.ll //==================================================================// // Shell script for converting .td files (run this last) //==================================================================// export LC_ALL='C' sed -i -e '/Patterns/!s/\("[A-Z0-9_]\+[ "e]\)/\L\1/g' SIInstructions.td sed -i -e 's/"EXP/"exp/g' SIInstrInfo.td llvm-svn: 221350
2014-11-05 22:50:53 +08:00
; SI: v_mov_b32_e32 [[REG:v[0-9]+]], 0x3e7
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
; SI: [[LOOP:BB[0-9]+_[0-9]+]]: ; %loop
[AMDGPU] Turn on the new waitcnt insertion pass. Adjust tests. -enable-si-insert-waitcnts=1 becomes the default -enable-si-insert-waitcnts=0 to use old pass Differential Revision: https://reviews.llvm.org/D33730 llvm-svn: 304551
2017-06-02 22:19:25 +08:00
; SI: s_waitcnt lgkmcnt(0)
R600/SI: Change all instruction assembly names to lowercase. This matches the format produced by the AMD proprietary driver. //==================================================================// // Shell script for converting .ll test cases: (Pass the .ll files you want to convert to this script as arguments). //==================================================================// ; This was necessary on my system so that A-Z in sed would match only ; upper case. I'm not sure why. export LC_ALL='C' TEST_FILES="$*" MATCHES=`grep -v Patterns SIInstructions.td | grep -o '"[A-Z0-9_]\+["e]' | grep -o '[A-Z0-9_]\+' | sort -r` for f in $TEST_FILES; do # Check that there are SI tests: grep -q -e 'verde' -e 'bonaire' -e 'SI' -e 'tahiti' $f if [ $? -eq 0 ]; then for match in $MATCHES; do sed -i -e "s/\([ :]$match\)/\L\1/" $f done # Try to get check lines with partial instruction names sed -i 's/\(;[ ]*SI[A-Z\\-]*: \)\([A-Z_0-9]\+\)/\1\L\2/' $f fi done sed -i -e 's/bb0_1/BB0_1/g' ../../../test/CodeGen/R600/infinite-loop.ll sed -i -e 's/SI-NOT: bfe/SI-NOT: {{[^@]}}bfe/g'../../../test/CodeGen/R600/llvm.AMDGPU.bfe.*32.ll ../../../test/CodeGen/R600/sext-in-reg.ll sed -i -e 's/exp_IEEE/EXP_IEEE/g' ../../../test/CodeGen/R600/llvm.exp2.ll sed -i -e 's/numVgprs/NumVgprs/g' ../../../test/CodeGen/R600/register-count-comments.ll sed -i 's/\(; CHECK[-NOT]*: \)\([A-Z_0-9]\+\)/\1\L\2/' ../../../test/CodeGen/R600/select64.ll ../../../test/CodeGen/R600/sgpr-copy.ll //==================================================================// // Shell script for converting .td files (run this last) //==================================================================// export LC_ALL='C' sed -i -e '/Patterns/!s/\("[A-Z0-9_]\+[ "e]\)/\L\1/g' SIInstructions.td sed -i -e 's/"EXP/"exp/g' SIInstrInfo.td llvm-svn: 221350
2014-11-05 22:50:53 +08:00
; SI: buffer_store_dword [[REG]]
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
; SI: s_branch [[LOOP]]
AMDGPU: Mark all unspecified CC functions in tests as amdgpu_kernel Currently the default C calling convention functions are treated the same as compute kernels. Make this explicit so the default calling convention can be changed to a non-kernel. Converted with perl -pi -e 's/define void/define amdgpu_kernel void/' on the relevant test directories (and undoing in one place that actually wanted a non-kernel). llvm-svn: 298444
2017-03-22 05:39:51 +08:00
define amdgpu_kernel void @infinite_loop(i32 addrspace(1)* %out) {
R600/SI: Fix assertion on infinite loops. This isn't the most useful case to fix in the real world, but bugpoint runs into this. llvm-svn: 201177
2014-02-12 05:12:38 +08:00
entry:
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
br label %loop
R600/SI: Fix assertion on infinite loops. This isn't the most useful case to fix in the real world, but bugpoint runs into this. llvm-svn: 201177
2014-02-12 05:12:38 +08:00
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
loop:
[AMDGPU] Enable LICM in the BE pipeline This allows to hoist code portion to compute reciprocal of loop invariant denominator in integer division after codegen prepare expansion. Differential Revision: https://reviews.llvm.org/D48604 llvm-svn: 335988
2018-06-30 00:26:53 +08:00
store volatile i32 999, i32 addrspace(1)* %out, align 4
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
br label %loop
R600/SI: Fix assertion on infinite loops. This isn't the most useful case to fix in the real world, but bugpoint runs into this. llvm-svn: 201177
2014-02-12 05:12:38 +08:00
}
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
; IR-LABEL: @infinite_loop_ret(
; IR: br i1 %cond, label %loop, label %UnifiedReturnBlock
; IR: loop:
[AMDGPU] Enable LICM in the BE pipeline This allows to hoist code portion to compute reciprocal of loop invariant denominator in integer division after codegen prepare expansion. Differential Revision: https://reviews.llvm.org/D48604 llvm-svn: 335988
2018-06-30 00:26:53 +08:00
; IR: store volatile i32 999, i32 addrspace(1)* %out, align 4
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
; IR: br i1 true, label %loop, label %UnifiedReturnBlock
; IR: UnifiedReturnBlock:
; IR: ret void
; SI-LABEL: {{^}}infinite_loop_ret:
; SI: s_cbranch_execz [[RET:BB[0-9]+_[0-9]+]]
; SI: v_mov_b32_e32 [[REG:v[0-9]+]], 0x3e7
; SI: [[LOOP:BB[0-9]+_[0-9]+]]: ; %loop
; SI: s_and_b64 vcc, exec, -1
; SI: s_waitcnt lgkmcnt(0)
; SI: buffer_store_dword [[REG]]
[AMDGPU] Optimize S_CBRANCH_VCC[N]Z -> S_CBRANCH_EXEC[N]Z Sometimes after basic block placement we end up with a code like: sreg = s_mov_b64 -1 vcc = s_and_b64 exec, sreg s_cbranch_vccz This happens as a join of a block assigning -1 to a saved mask and another block which consumes that saved mask with s_and_b64 and a branch. This is essentially a single s_cbranch_execz instruction when moved into a single new basic block. Differential Revision: https://reviews.llvm.org/D54164 llvm-svn: 346690
2018-11-13 02:48:17 +08:00
; SI: s_cbranch_execnz [[LOOP]]
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
; SI: [[RET]]: ; %UnifiedReturnBlock
; SI: s_endpgm
define amdgpu_kernel void @infinite_loop_ret(i32 addrspace(1)* %out) {
entry:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%cond = icmp eq i32 %tmp, 1
br i1 %cond, label %loop, label %return
loop:
[AMDGPU] Enable LICM in the BE pipeline This allows to hoist code portion to compute reciprocal of loop invariant denominator in integer division after codegen prepare expansion. Differential Revision: https://reviews.llvm.org/D48604 llvm-svn: 335988
2018-06-30 00:26:53 +08:00
store volatile i32 999, i32 addrspace(1)* %out, align 4
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
br label %loop
return:
ret void
}
; IR-LABEL: @infinite_loops(
; IR: br i1 undef, label %loop1, label %loop2
; IR: loop1:
[AMDGPU] Enable LICM in the BE pipeline This allows to hoist code portion to compute reciprocal of loop invariant denominator in integer division after codegen prepare expansion. Differential Revision: https://reviews.llvm.org/D48604 llvm-svn: 335988
2018-06-30 00:26:53 +08:00
; IR: store volatile i32 999, i32 addrspace(1)* %out, align 4
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
; IR: br i1 true, label %loop1, label %DummyReturnBlock
; IR: loop2:
[AMDGPU] Enable LICM in the BE pipeline This allows to hoist code portion to compute reciprocal of loop invariant denominator in integer division after codegen prepare expansion. Differential Revision: https://reviews.llvm.org/D48604 llvm-svn: 335988
2018-06-30 00:26:53 +08:00
; IR: store volatile i32 888, i32 addrspace(1)* %out, align 4
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
; IR: br i1 true, label %loop2, label %DummyReturnBlock
; IR: DummyReturnBlock:
; IR: ret void
; SI-LABEL: {{^}}infinite_loops:
; SI: v_mov_b32_e32 [[REG1:v[0-9]+]], 0x3e7
; SI: s_and_b64 vcc, exec, -1
; SI: [[LOOP1:BB[0-9]+_[0-9]+]]: ; %loop1
; SI: s_waitcnt lgkmcnt(0)
; SI: buffer_store_dword [[REG1]]
; SI: s_cbranch_vccnz [[LOOP1]]
; SI: s_branch [[RET:BB[0-9]+_[0-9]+]]
; SI: v_mov_b32_e32 [[REG2:v[0-9]+]], 0x378
; SI: s_and_b64 vcc, exec, -1
; SI: [[LOOP2:BB[0-9]+_[0-9]+]]: ; %loop2
; SI: s_waitcnt lgkmcnt(0)
; SI: buffer_store_dword [[REG2]]
; SI: s_cbranch_vccnz [[LOOP2]]
; SI: [[RET]]: ; %DummyReturnBlock
; SI: s_endpgm
define amdgpu_kernel void @infinite_loops(i32 addrspace(1)* %out) {
entry:
br i1 undef, label %loop1, label %loop2
loop1:
[AMDGPU] Enable LICM in the BE pipeline This allows to hoist code portion to compute reciprocal of loop invariant denominator in integer division after codegen prepare expansion. Differential Revision: https://reviews.llvm.org/D48604 llvm-svn: 335988
2018-06-30 00:26:53 +08:00
store volatile i32 999, i32 addrspace(1)* %out, align 4
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
br label %loop1
loop2:
[AMDGPU] Enable LICM in the BE pipeline This allows to hoist code portion to compute reciprocal of loop invariant denominator in integer division after codegen prepare expansion. Differential Revision: https://reviews.llvm.org/D48604 llvm-svn: 335988
2018-06-30 00:26:53 +08:00
store volatile i32 888, i32 addrspace(1)* %out, align 4
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
br label %loop2
}
; IR-LABEL: @infinite_loop_nest_ret(
; IR: br i1 %cond1, label %outer_loop, label %UnifiedReturnBlock
; IR: outer_loop:
; IR: br label %inner_loop
; IR: inner_loop:
[AMDGPU] Enable LICM in the BE pipeline This allows to hoist code portion to compute reciprocal of loop invariant denominator in integer division after codegen prepare expansion. Differential Revision: https://reviews.llvm.org/D48604 llvm-svn: 335988
2018-06-30 00:26:53 +08:00
; IR: store volatile i32 999, i32 addrspace(1)* %out, align 4
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
; IR: %cond3 = icmp eq i32 %tmp, 3
; IR: br i1 true, label %TransitionBlock, label %UnifiedReturnBlock
; IR: TransitionBlock:
; IR: br i1 %cond3, label %inner_loop, label %outer_loop
; IR: UnifiedReturnBlock:
; IR: ret void
; SI-LABEL: {{^}}infinite_loop_nest_ret:
; SI: s_cbranch_execz [[RET:BB[0-9]+_[0-9]+]]
; SI: s_mov_b32
; SI: [[OUTER_LOOP:BB[0-9]+_[0-9]+]]: ; %outer_loop
; SI: [[INNER_LOOP:BB[0-9]+_[0-9]+]]: ; %inner_loop
; SI: s_waitcnt expcnt(0)
; SI: v_mov_b32_e32 [[REG:v[0-9]+]], 0x3e7
; SI: s_waitcnt lgkmcnt(0)
; SI: buffer_store_dword [[REG]]
; SI: s_andn2_b64 exec
; SI: s_cbranch_execnz [[INNER_LOOP]]
; SI: s_andn2_b64 exec
; SI: s_cbranch_execnz [[OUTER_LOOP]]
; SI: [[RET]]: ; %UnifiedReturnBlock
; SI: s_endpgm
define amdgpu_kernel void @infinite_loop_nest_ret(i32 addrspace(1)* %out) {
entry:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x()
%cond1 = icmp eq i32 %tmp, 1
br i1 %cond1, label %outer_loop, label %return
outer_loop:
; %cond2 = icmp eq i32 %tmp, 2
; br i1 %cond2, label %outer_loop, label %inner_loop
br label %inner_loop
inner_loop: ; preds = %LeafBlock, %LeafBlock1
[AMDGPU] Enable LICM in the BE pipeline This allows to hoist code portion to compute reciprocal of loop invariant denominator in integer division after codegen prepare expansion. Differential Revision: https://reviews.llvm.org/D48604 llvm-svn: 335988
2018-06-30 00:26:53 +08:00
store volatile i32 999, i32 addrspace(1)* %out, align 4
AMDGPU/SI: Handle infinite loop for the structurizer to work with CFG with infinite loops. Summary: The current StructurizeCFG pass only works for CFG with one exit. AMDGPUUnifyDivergentExitNodes combines multiple "return" blocks and/or "unreachable" blocks to one exit block for the Structurizer to work. However, infinite loop is another kind of special "exit", and if we don't handle it, the case of multiple exits will prevent the structurizer from working. In this work, for each infinite loop, we add a dummy edge to the "return" block, and thus the AMDGPUUnifyDivergentExitNodes pass will work with infinite loops. This will make CFG with infinite loops be structurized. Reviewer: nhaehnle Differential Revision: https://reviews.llvm.org/D46340 llvm-svn: 332625
2018-05-18 00:45:01 +08:00
%cond3 = icmp eq i32 %tmp, 3
br i1 %cond3, label %inner_loop, label %outer_loop
return:
ret void
}
declare i32 @llvm.amdgcn.workitem.id.x()