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[AMDGPU] Inhibit SDWA if target instruction has FI 

Differential Revision: https://reviews.llvm.org/D85918
This commit is contained in:
Stanislav Mekhanoshin 2020-08-13 11:15:44 -07:00
parent d25cb5a8a2
commit 0462aef5f3
2 changed files with 42 additions and 0 deletions
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10
llvm/lib/Target/AMDGPU/SIPeepholeSDWA.cpp
View File

@ -992,6 +992,16 @@ bool SIPeepholeSDWA::isConvertibleToSDWA(MachineInstr &MI,
if (Opc == AMDGPU::V_CNDMASK_B32_e32)
return false;
if (MachineOperand *Src0 = TII->getNamedOperand(MI, AMDGPU::OpName::src0)) {
if (!Src0->isReg() && !Src0->isImm())
return false;
}
if (MachineOperand *Src1 = TII->getNamedOperand(MI, AMDGPU::OpName::src1)) {
if (!Src1->isReg() && !Src1->isImm())
return false;
}
return true;
}

32
llvm/test/CodeGen/AMDGPU/sdwa-stack.mir Normal file
View File

@ -0,0 +1,32 @@
# RUN: llc -march=amdgcn -mcpu=gfx1010 -run-pass=si-peephole-sdwa -verify-machineinstrs -o - %s | FileCheck -check-prefix=GCN %s
# Do not fold stack objects into SDWA.
---
# GCN-LABEL: name: sdwa_stack_object_src0
# GCN: V_ADD_U32_e64 %stack.0, killed %1
name: sdwa_stack_object_src0
stack:
- { id: 0, type: default, offset: 0, size: 32, alignment: 4, stack-id: default }
body: |
bb.0:
%0:vgpr_32 = IMPLICIT_DEF
%1:vgpr_32 = V_AND_B32_e32 255, %0, implicit $exec
%2:vgpr_32 = V_ADD_U32_e64 %stack.0, killed %1, 0, implicit $exec
S_ENDPGM 0, implicit %2
...
---
name: sdwa_stack_object_src1
# GCN-LABEL: name: sdwa_stack_object_src1
# GCN: V_ADD_U32_e64 killed %1, %stack.0
stack:
- { id: 0, type: default, offset: 0, size: 32, alignment: 4, stack-id: default }
body: |
bb.0:
%0:vgpr_32 = IMPLICIT_DEF
%1:vgpr_32 = V_AND_B32_e32 255, %0, implicit $exec
%2:vgpr_32 = V_ADD_U32_e64 killed %1, %stack.0, 0, implicit $exec
S_ENDPGM 0, implicit %2
...