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[AMDGPU] Fix CS scratch setup on pre-GCN3 ASICs 

Summary:
Prior to GCN3 s_load_dword offsets are in dwords rather than bytes.
Thus the scratch buffer descriptor offset must be adjusted for pre-GCN3 ASICs.

Reviewers: nhaehnle, tpr

Reviewed By: nhaehnle

Subscribers: sheredom, arsenm, kzhuravl, jvesely, wdng, yaxunl, dstuttard, t-tye, jfb, llvm-commits

Differential Revision: https://reviews.llvm.org/D56496

llvm-svn: 353530
This commit is contained in:
Carl Ritson 2019-02-08 15:41:11 +00:00
parent f5f1b0e59e
commit 494b8ac95a
2 changed files with 8 additions and 3 deletions
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4
llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
View File

@ -422,9 +422,11 @@ void SIFrameLowering::emitEntryFunctionScratchSetup(const GCNSubtarget &ST,
MachineMemOperand::MODereferenceable,
16, 4);
unsigned Offset = Fn.getCallingConv() == CallingConv::AMDGPU_CS ? 16 : 0;
const GCNSubtarget &Subtarget = MF.getSubtarget<GCNSubtarget>();
unsigned EncodedOffset = AMDGPU::getSMRDEncodedOffset(Subtarget, Offset);
BuildMI(MBB, I, DL, LoadDwordX4, ScratchRsrcReg)
.addReg(Rsrc01)
.addImm(Offset) // offset
.addImm(EncodedOffset) // offset
.addImm(0) // glc
.addReg(ScratchRsrcReg, RegState::ImplicitDefine)
.addMemOperand(MMO);

7
llvm/test/CodeGen/AMDGPU/amdpal.ll
View File

@ -1,4 +1,5 @@
; RUN: llc < %s -mtriple=amdgcn--amdpal -mcpu=tahiti | FileCheck --check-prefix=PAL --enable-var-scope %s
; RUN: llc < %s -mtriple=amdgcn--amdpal -mcpu=tahiti | FileCheck --check-prefixes=PAL,CI --enable-var-scope %s
; RUN: llc < %s -mtriple=amdgcn--amdpal -mcpu=tonga | FileCheck --check-prefixes=PAL,VI --enable-var-scope %s
; PAL-NOT: .AMDGPU.config
; PAL-LABEL: {{^}}simple:
@ -55,11 +56,13 @@ entry:
; Check code sequence for amdpal use of scratch for alloca in a compute shader.
; The scratch descriptor is loaded from offset 0x10 of the GIT, rather than offset
; 0 in a graphics shader.
; Prior to GCN3 s_load_dword offsets are dwords, so the offset will be 0x4.
; PAL-LABEL: {{^}}scratch2_cs:
; PAL: s_movk_i32 s{{[0-9]+}}, 0x1234
; PAL: s_mov_b32 s[[GITPTR:[0-9]+]], s0
; PAL: s_load_dwordx4 s{{\[}}[[SCRATCHDESC:[0-9]+]]:{{[0-9]+]}}, s{{\[}}[[GITPTR]]:{{[0-9]+\]}}, 0x10
; CI: s_load_dwordx4 s{{\[}}[[SCRATCHDESC:[0-9]+]]:{{[0-9]+]}}, s{{\[}}[[GITPTR]]:{{[0-9]+\]}}, 0x4
; VI: s_load_dwordx4 s{{\[}}[[SCRATCHDESC:[0-9]+]]:{{[0-9]+]}}, s{{\[}}[[GITPTR]]:{{[0-9]+\]}}, 0x10
; PAL: buffer_store{{.*}}, s{{\[}}[[SCRATCHDESC]]:
define amdgpu_cs void @scratch2_cs(i32 inreg, i32 inreg, i32 inreg, <3 x i32> inreg, i32 inreg, <3 x i32> %coord, <2 x i32> %in, i32 %extra, i32 %idx) #0 {