[AMDGPU] Scratch setup fix on AMDPAL gfx9+ merge shader
Summary:
With OS type AMDPAL, the scratch descriptor is hardwired to be loaded
from offset 0 of the global information table, whose low pointer is
passed in s0. For a merge shader on gfx9+, it needs to be s8 instead, as
the hardware reserves s0-s7.
Reviewers: kzhuravl
Subscribers: arsenm, nhaehnle, dstuttard, llvm-commits, t-tye, yaxunl, wdng, kzhuravl
Differential Revision: https://reviews.llvm.org/D42203
llvm-svn: 326088
2018-02-26 22:46:43 +08:00
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; RUN: llc -mtriple=amdgcn--amdpal -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=GFX9 -enable-var-scope %s
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; On gfx9 and later, a HS is a merged shader, in which s0-s7 are reserved by the
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; hardware, so the PAL puts the GIT (global information table) in s8 rather
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; than s0.
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; GCN-LABEL: {{^}}_amdgpu_hs_main:
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; GCN: s_getpc_b64 s{{\[}}[[GITPTR:[0-9]+]]:
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; PREGFX9: s_mov_b32 s[[GITPTR]], s0
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; GFX9: s_mov_b32 s[[GITPTR]], s8
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define amdgpu_hs void @_amdgpu_hs_main(i32 inreg %arg, i32 inreg %arg1, i32 inreg %arg2, i32 inreg %arg3, i32 inreg %arg4, i32 inreg %arg5, i32 inreg %arg6, i32 inreg %arg7, <6 x i32> inreg %arg8) {
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.entry:
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%__llpc_global_proxy_7.i = alloca [3 x <4 x float>], align 16, addrspace(5)
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%tmp = icmp ult i32 undef, undef
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br i1 %tmp, label %.beginls, label %.endls
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.beginls: ; preds = %.entry
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%tmp15 = extractelement <6 x i32> %arg8, i32 3
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%.0.vec.insert.i = insertelement <2 x i32> undef, i32 %tmp15, i32 0
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%.4.vec.insert.i = shufflevector <2 x i32> %.0.vec.insert.i, <2 x i32> undef, <2 x i32> <i32 0, i32 3>
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%tmp16 = bitcast <2 x i32> %.4.vec.insert.i to i64
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br label %.endls
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.endls: ; preds = %.beginls, %.entry
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%.fca.2.gep120.i = getelementptr inbounds [3 x <4 x float>], [3 x <4 x float>] addrspace(5)* %__llpc_global_proxy_7.i, i64 0, i64 2
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2018-06-30 00:26:53 +08:00
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store volatile <4 x float> <float 9.000000e+00, float 1.000000e+01, float 1.100000e+01, float 1.200000e+01>, <4 x float> addrspace(5)* %.fca.2.gep120.i, align 16
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[AMDGPU] Scratch setup fix on AMDPAL gfx9+ merge shader
Summary:
With OS type AMDPAL, the scratch descriptor is hardwired to be loaded
from offset 0 of the global information table, whose low pointer is
passed in s0. For a merge shader on gfx9+, it needs to be s8 instead, as
the hardware reserves s0-s7.
Reviewers: kzhuravl
Subscribers: arsenm, nhaehnle, dstuttard, llvm-commits, t-tye, yaxunl, wdng, kzhuravl
Differential Revision: https://reviews.llvm.org/D42203
llvm-svn: 326088
2018-02-26 22:46:43 +08:00
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br label %bb
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bb: ; preds = %bb, %.endls
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%lsr.iv182 = phi [3 x <4 x float>] addrspace(5)* [ undef, %bb ], [ %__llpc_global_proxy_7.i, %.endls ]
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%scevgep183 = getelementptr [3 x <4 x float>], [3 x <4 x float>] addrspace(5)* %lsr.iv182, i32 0, i32 1
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br label %bb
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}
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