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AMDGPU/GlobalISel: Fix RegBankSelect for unaligned, uniform constant loads 

llvm-svn: 371416
This commit is contained in:
Matt Arsenault 2019-09-09 16:06:37 +00:00
parent 9ede7c0395
commit d8409b178e
2 changed files with 56 additions and 6 deletions
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9
llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
View File

@ -320,12 +320,13 @@ AMDGPURegisterBankInfo::getInstrAlternativeMappingsIntrinsicWSideEffects(
}
}
static bool isInstrUniformNonExtLoad(const MachineInstr &MI) {
static bool isInstrUniformNonExtLoadAlign4(const MachineInstr &MI) {
if (!MI.hasOneMemOperand())
return false;
const MachineMemOperand *MMO = *MI.memoperands_begin();
return MMO->getSize() >= 4 && AMDGPUInstrInfo::isUniformMMO(MMO);
return MMO->getSize() >= 4 && MMO->getAlignment() >= 4 &&
AMDGPUInstrInfo::isUniformMMO(MMO);
}
RegisterBankInfo::InstructionMappings
@ -426,7 +427,7 @@ AMDGPURegisterBankInfo::getInstrAlternativeMappings(
unsigned PtrSize = PtrTy.getSizeInBits();
unsigned AS = PtrTy.getAddressSpace();
LLT LoadTy = MRI.getType(MI.getOperand(0).getReg());
if (isInstrUniformNonExtLoad(MI) &&
if (isInstrUniformNonExtLoadAlign4(MI) &&
(AS != AMDGPUAS::LOCAL_ADDRESS && AS != AMDGPUAS::REGION_ADDRESS)) {
const InstructionMapping &SSMapping = getInstructionMapping(
1, 1, getOperandsMapping(
@ -1482,7 +1483,7 @@ AMDGPURegisterBankInfo::getInstrMappingForLoad(const MachineInstr &MI) const {
const ValueMapping *ValMapping;
const ValueMapping *PtrMapping;
if (isInstrUniformNonExtLoad(MI) &&
if (isInstrUniformNonExtLoadAlign4(MI) &&
(AS != AMDGPUAS::LOCAL_ADDRESS && AS != AMDGPUAS::REGION_ADDRESS)) {
// We have a uniform instruction so we want to use an SMRD load
ValMapping = AMDGPU::getValueMapping(AMDGPU::SGPRRegBankID, Size);

53
llvm/test/CodeGen/AMDGPU/GlobalISel/regbankselect-load.mir
View File

@ -1,5 +1,5 @@
# RUN: llc -march=amdgcn -run-pass=regbankselect %s -verify-machineinstrs -o - -regbankselect-fast | FileCheck %s
# RUN: llc -march=amdgcn -run-pass=regbankselect %s -verify-machineinstrs -o - -regbankselect-greedy | FileCheck %s
# RUN: llc -mtriple=amdgcn-amd-amdhsa -run-pass=regbankselect %s -verify-machineinstrs -o - -regbankselect-fast | FileCheck %s
# RUN: llc -mtriple=amdgcn-amd-amdhsa -run-pass=regbankselect %s -verify-machineinstrs -o - -regbankselect-greedy | FileCheck %s
--- |
define amdgpu_kernel void @load_global_v8i32_non_uniform(<8 x i32> addrspace(1)* %in) {
@ -65,6 +65,9 @@
define amdgpu_kernel void @extload_global_i8_to_i32_uniform() { ret void }
define amdgpu_kernel void @extload_constant_i16_to_i32_uniform() { ret void }
define amdgpu_kernel void @extload_global_i16_to_i32_uniform() { ret void }
define amdgpu_kernel void @load_constant_i32_uniform_align4() {ret void}
define amdgpu_kernel void @load_constant_i32_uniform_align2() {ret void}
define amdgpu_kernel void @load_constant_i32_uniform_align1() {ret void}
declare i32 @llvm.amdgcn.workitem.id.x() #0
attributes #0 = { nounwind readnone }
@ -586,3 +589,49 @@ body: |
%0:_(p4) = COPY $sgpr0_sgpr1
%1:_(s32) = G_LOAD %0 :: (load 2, addrspace 1, align 2)
...
---
name: load_constant_i32_uniform_align4
legalized: true
body: |
bb.0:
liveins: $sgpr0_sgpr1
; CHECK-LABEL: name: load_constant_i32_uniform_align4
; CHECK: %0:sgpr(p4) = COPY $sgpr0_sgpr1
; CHECK: %1:sgpr(s32) = G_LOAD %0(p4) :: (load 4, addrspace 4)
%0:_(p4) = COPY $sgpr0_sgpr1
%1:_(s32) = G_LOAD %0 :: (load 4, addrspace 4, align 4)
...
---
name: load_constant_i32_uniform_align2
legalized: true
body: |
bb.0:
liveins: $sgpr0_sgpr1
; CHECK-LABEL: name: load_constant_i32_uniform_align2
; CHECK: %0:sgpr(p4) = COPY $sgpr0_sgpr1
; CHECK: %2:vgpr(p4) = COPY %0(p4)
; CHECK: %1:vgpr(s32) = G_LOAD %2(p4) :: (load 4, align 2, addrspace 4)
%0:_(p4) = COPY $sgpr0_sgpr1
%1:_(s32) = G_LOAD %0 :: (load 4, addrspace 4, align 2)
...
---
name: load_constant_i32_uniform_align1
legalized: true
body: |
bb.0:
liveins: $sgpr0_sgpr1
; CHECK-LABEL: name: load_constant_i32_uniform_align1
; CHECK: %0:sgpr(p4) = COPY $sgpr0_sgpr1
; CHECK: %2:vgpr(p4) = COPY %0(p4)
; CHECK: %1:vgpr(s32) = G_LOAD %2(p4) :: (load 4, align 1, addrspace 4)
%0:_(p4) = COPY $sgpr0_sgpr1
%1:_(s32) = G_LOAD %0 :: (load 4, addrspace 4, align 1)
...