[llvm] r361333 - AMDGPU: Assume calls read exec
Matt Arsenault via llvm-commits
llvm-commits at lists.llvm.org
Tue May 21 16:23:16 PDT 2019
Author: arsenm
Date: Tue May 21 16:23:16 2019
New Revision: 361333
URL: http://llvm.org/viewvc/llvm-project?rev=361333&view=rev
Log:
AMDGPU: Assume calls read exec
Added:
llvm/trunk/test/CodeGen/AMDGPU/collapse-endcf2.mir
Modified:
llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp
Modified: llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp?rev=361333&r1=361332&r2=361333&view=diff
==============================================================================
--- llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/AMDGPU/SIInstrInfo.cpp Tue May 21 16:23:16 2019
@@ -2514,6 +2514,10 @@ bool SIInstrInfo::mayReadEXEC(const Mach
return MI.readsRegister(AMDGPU::EXEC, &RI);
}
+ // Make a conservative assumption about the callee.
+ if (MI.isCall())
+ return true;
+
// Be conservative with any unhandled generic opcodes.
if (!isTargetSpecificOpcode(MI.getOpcode()))
return true;
Added: llvm/trunk/test/CodeGen/AMDGPU/collapse-endcf2.mir
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/AMDGPU/collapse-endcf2.mir?rev=361333&view=auto
==============================================================================
--- llvm/trunk/test/CodeGen/AMDGPU/collapse-endcf2.mir (added)
+++ llvm/trunk/test/CodeGen/AMDGPU/collapse-endcf2.mir Tue May 21 16:23:16 2019
@@ -0,0 +1,121 @@
+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -march=amdgcn -verify-machineinstrs -run-pass=si-optimize-exec-masking-pre-ra %s -o - | FileCheck -check-prefix=GCN %s
+
+--- |
+ define amdgpu_kernel void @call_no_explicit_exec_dependency () {
+ unreachable
+ }
+
+ declare void @func()
+
+...
+
+# Call should be assumed to read exec
+---
+name: call_no_explicit_exec_dependency
+tracksRegLiveness: true
+liveins:
+ - { reg: '$vgpr0', virtual-reg: '%0' }
+ - { reg: '$sgpr0_sgpr1', virtual-reg: '%1' }
+machineFunctionInfo:
+ isEntryFunction: true
+body: |
+ ; GCN-LABEL: name: call_no_explicit_exec_dependency
+ ; GCN: bb.0:
+ ; GCN: successors: %bb.1(0x40000000), %bb.4(0x40000000)
+ ; GCN: liveins: $vgpr0, $sgpr0_sgpr1
+ ; GCN: [[COPY:%[0-9]+]]:sgpr_64 = COPY $sgpr0_sgpr1
+ ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
+ ; GCN: [[V_CMP_LT_U32_e64_:%[0-9]+]]:sreg_64 = V_CMP_LT_U32_e64 1, [[COPY1]], implicit $exec
+ ; GCN: [[COPY2:%[0-9]+]]:sreg_64 = COPY $exec, implicit-def $exec
+ ; GCN: [[S_AND_B64_:%[0-9]+]]:sreg_64 = S_AND_B64 [[COPY2]], [[V_CMP_LT_U32_e64_]], implicit-def dead $scc
+ ; GCN: $exec = S_MOV_B64_term [[S_AND_B64_]]
+ ; GCN: SI_MASK_BRANCH %bb.4, implicit $exec
+ ; GCN: S_BRANCH %bb.1
+ ; GCN: bb.1:
+ ; GCN: successors: %bb.2(0x40000000), %bb.3(0x40000000)
+ ; GCN: undef %5.sub0_sub1:sgpr_128 = S_LOAD_DWORDX2_IMM [[COPY]], 9, 0, 0 :: (dereferenceable invariant load 8, align 4, addrspace 4)
+ ; GCN: undef %6.sub0:vreg_64 = V_LSHLREV_B32_e32 2, [[COPY1]], implicit $exec
+ ; GCN: %6.sub1:vreg_64 = V_MOV_B32_e32 0, implicit $exec
+ ; GCN: [[COPY3:%[0-9]+]]:vgpr_32 = COPY %5.sub1
+ ; GCN: undef %8.sub0:vreg_64, %9:sreg_64_xexec = V_ADD_I32_e64 %5.sub0, %6.sub0, 0, implicit $exec
+ ; GCN: %8.sub1:vreg_64, dead %10:sreg_64_xexec = V_ADDC_U32_e64 0, [[COPY3]], %9, 0, implicit $exec
+ ; GCN: %5.sub3:sgpr_128 = S_MOV_B32 61440
+ ; GCN: %5.sub2:sgpr_128 = S_MOV_B32 0
+ ; GCN: BUFFER_STORE_DWORD_ADDR64 %6.sub1, %6, %5, 0, 0, 0, 0, 0, 0, implicit $exec :: (store 4, addrspace 1)
+ ; GCN: [[V_CMP_NE_U32_e64_:%[0-9]+]]:sreg_64 = V_CMP_NE_U32_e64 2, [[COPY1]], implicit $exec
+ ; GCN: [[COPY4:%[0-9]+]]:sreg_64 = COPY $exec, implicit-def $exec
+ ; GCN: [[S_AND_B64_1:%[0-9]+]]:sreg_64 = S_AND_B64 [[COPY4]], [[V_CMP_NE_U32_e64_]], implicit-def dead $scc
+ ; GCN: $exec = S_MOV_B64_term [[S_AND_B64_1]]
+ ; GCN: SI_MASK_BRANCH %bb.3, implicit $exec
+ ; GCN: S_BRANCH %bb.2
+ ; GCN: bb.2:
+ ; GCN: successors: %bb.3(0x80000000)
+ ; GCN: %5.sub0:sgpr_128 = COPY %5.sub2
+ ; GCN: %5.sub1:sgpr_128 = COPY %5.sub2
+ ; GCN: [[V_MOV_B32_e32_:%[0-9]+]]:vgpr_32 = V_MOV_B32_e32 1, implicit $exec
+ ; GCN: BUFFER_STORE_DWORD_ADDR64 [[V_MOV_B32_e32_]], %8, %5, 0, 4, 0, 0, 0, 0, implicit $exec :: (store 4, addrspace 1)
+ ; GCN: bb.3:
+ ; GCN: successors: %bb.4(0x80000000)
+ ; GCN: $exec = S_OR_B64 $exec, [[COPY4]], implicit-def $scc
+ ; GCN: [[DEF:%[0-9]+]]:sreg_64 = IMPLICIT_DEF
+ ; GCN: dead %16:sreg_64 = SI_CALL [[DEF]], @func, csr_amdgpu_highregs
+ ; GCN: bb.4:
+ ; GCN: $exec = S_OR_B64 $exec, [[COPY2]], implicit-def $scc
+ ; GCN: [[V_MOV_B32_e32_1:%[0-9]+]]:vgpr_32 = V_MOV_B32_e32 3, implicit $exec
+ ; GCN: [[V_MOV_B32_e32_2:%[0-9]+]]:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
+ ; GCN: $m0 = S_MOV_B32 -1
+ ; GCN: DS_WRITE_B32 [[V_MOV_B32_e32_2]], [[V_MOV_B32_e32_1]], 0, 0, implicit $m0, implicit $exec :: (store 4, addrspace 3)
+ ; GCN: S_ENDPGM 0
+ bb.0:
+ successors: %bb.1, %bb.4
+ liveins: $vgpr0, $sgpr0_sgpr1
+
+ %1:sgpr_64 = COPY $sgpr0_sgpr1
+ %0:vgpr_32 = COPY $vgpr0
+ %2:sreg_64 = V_CMP_LT_U32_e64 1, %0, implicit $exec
+ %3:sreg_64 = COPY $exec, implicit-def $exec
+ %4:sreg_64 = S_AND_B64 %3, %2, implicit-def dead $scc
+ $exec = S_MOV_B64_term %4
+ SI_MASK_BRANCH %bb.4, implicit $exec
+ S_BRANCH %bb.1
+
+ bb.1:
+ successors: %bb.2, %bb.3
+
+ undef %5.sub0_sub1:sgpr_128 = S_LOAD_DWORDX2_IMM %1, 9, 0, 0 :: (dereferenceable invariant load 8, align 4, addrspace 4)
+ undef %6.sub0:vreg_64 = V_LSHLREV_B32_e32 2, %0, implicit $exec
+ %6.sub1:vreg_64 = V_MOV_B32_e32 0, implicit $exec
+ %7:vgpr_32 = COPY %5.sub1
+ undef %8.sub0:vreg_64, %9:sreg_64_xexec = V_ADD_I32_e64 %5.sub0, %6.sub0, 0, implicit $exec
+ %8.sub1:vreg_64, dead %10:sreg_64_xexec = V_ADDC_U32_e64 0, %7, %9, 0, implicit $exec
+ %5.sub3:sgpr_128 = S_MOV_B32 61440
+ %5.sub2:sgpr_128 = S_MOV_B32 0
+ BUFFER_STORE_DWORD_ADDR64 %6.sub1, %6, %5, 0, 0, 0, 0, 0, 0, implicit $exec :: (store 4, addrspace 1)
+ %11:sreg_64 = V_CMP_NE_U32_e64 2, %0, implicit $exec
+ %12:sreg_64 = COPY $exec, implicit-def $exec
+ %13:sreg_64 = S_AND_B64 %12, %11, implicit-def dead $scc
+ $exec = S_MOV_B64_term %13
+ SI_MASK_BRANCH %bb.3, implicit $exec
+ S_BRANCH %bb.2
+
+ bb.2:
+ %5.sub0:sgpr_128 = COPY %5.sub2
+ %5.sub1:sgpr_128 = COPY %5.sub2
+ %14:vgpr_32 = V_MOV_B32_e32 1, implicit $exec
+ BUFFER_STORE_DWORD_ADDR64 %14, %8, %5, 0, 4, 0, 0, 0, 0, implicit $exec :: (store 4, addrspace 1)
+
+ bb.3:
+ $exec = S_OR_B64 $exec, %12, implicit-def $scc
+ %20:sreg_64 = IMPLICIT_DEF
+ %21:sreg_64 = SI_CALL %20, @func, csr_amdgpu_highregs
+
+ bb.4:
+ $exec = S_OR_B64 $exec, %3, implicit-def $scc
+ %17:vgpr_32 = V_MOV_B32_e32 3, implicit $exec
+ %18:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
+ $m0 = S_MOV_B32 -1
+ DS_WRITE_B32 %18, %17, 0, 0, implicit $m0, implicit $exec :: (store 4, addrspace 3)
+ S_ENDPGM 0
+
+...
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