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AMDGPU: Don't align callable functions to 256 

llvm-svn: 300720
This commit is contained in:
Matt Arsenault 2017-04-19 17:42:39 +00:00
parent 4c1ecded63
commit 6cb7b8a42f
3 changed files with 34 additions and 1 deletions
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4
llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
View File

@ -184,9 +184,11 @@ void AMDGPUAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) {
}
bool AMDGPUAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
const AMDGPUMachineFunction *MFI = MF.getInfo<AMDGPUMachineFunction>();
// The starting address of all shader programs must be 256 bytes aligned.
MF.setAlignment(8);
// Regular functions just need the basic required instruction alignment.
MF.setAlignment(MFI->isEntryFunction() ? 8 : 2);
SetupMachineFunction(MF);

18
llvm/test/CodeGen/AMDGPU/hsa-func-align.ll Normal file
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@ -0,0 +1,18 @@
; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=kaveri < %s | FileCheck -check-prefix=HSA %s
; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=kaveri -filetype=obj < %s | llvm-readobj -symbols -s -sd | FileCheck -check-prefix=ELF %s
; ELF: Section {
; ELF: Name: .text
; ELF: SHF_ALLOC (0x2)
; ELF: SHF_EXECINSTR (0x4)
; ELF: AddressAlignment: 32
; ELF: }
; HSA: .globl simple_align16
; HSA: .p2align 5
define void @simple_align16(i32 addrspace(1)* addrspace(2)* %ptr.out) align 32 {
entry:
%out = load i32 addrspace(1)*, i32 addrspace(1)* addrspace(2)* %ptr.out
store i32 0, i32 addrspace(1)* %out
ret void
}

13
llvm/test/CodeGen/AMDGPU/hsa-func.ll
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@ -14,6 +14,7 @@
; ELF: Flags [ (0x6)
; ELF: SHF_ALLOC (0x2)
; ELF: SHF_EXECINSTR (0x4)
; ELF: AddressAlignment: 4
; ELF: }
; ELF: SHT_NOTE
@ -36,6 +37,8 @@
; HSA-VI: .hsa_code_object_isa 8,0,1,"AMD","AMDGPU"
; HSA-NOT: .amdgpu_hsa_kernel simple
; HSA: .globl simple
; HSA: .p2align 2
; HSA: {{^}}simple:
; HSA: .amd_kernel_code_t
; HSA: enable_sgpr_private_segment_buffer = 1
@ -58,3 +61,13 @@ entry:
store i32 0, i32 addrspace(1)* %out
ret void
}
; Ignore explicit alignment that is too low.
; HSA: .globl simple_align2
; HSA: .p2align 2
define void @simple_align2(i32 addrspace(1)* addrspace(2)* %ptr.out) align 2 {
entry:
%out = load i32 addrspace(1)*, i32 addrspace(1)* addrspace(2)* %ptr.out
store i32 0, i32 addrspace(1)* %out
ret void
}