mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-26 12:43:36 +01:00
74be1319be
AMDGPU normally spills SGPRs to VGPRs. Previously, since all register classes are handled at the same time, this was problematic. We don't know ahead of time how many registers will be needed to be reserved to handle the spilling. If no VGPRs were left for spilling, we would have to try to spill to memory. If the spilled SGPRs were required for exec mask manipulation, it is highly problematic because the lanes active at the point of spill are not necessarily the same as at the restore point. Avoid this problem by fully allocating SGPRs in a separate regalloc run from VGPRs. This way we know the exact number of VGPRs needed, and can reserve them for a second run. This fixes the most serious issues, but it is still possible using inline asm to make all VGPRs unavailable. Start erroring in the case where we ever would require memory for an SGPR spill. This is implemented by giving each regalloc pass a callback which reports if a register class should be handled or not. A few passes need some small changes to deal with leftover virtual registers. In the AMDGPU implementation, a new pass is introduced to take the place of PrologEpilogInserter for SGPR spills emitted during the first run. One disadvantage of this is currently StackSlotColoring is no longer used for SGPR spills. It would need to be run again, which will require more work. Error if the standard -regalloc option is used. Introduce new separate -sgpr-regalloc and -vgpr-regalloc flags, so the two runs can be controlled individually. PBQB is not currently supported, so this also prevents using the unhandled allocator.
167 lines
8.6 KiB
LLVM
167 lines
8.6 KiB
LLVM
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -verify-machineinstrs < %s | FileCheck -check-prefixes=GFX9 %s
|
|
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1010 -verify-machineinstrs < %s | FileCheck -check-prefixes=GFX10 %s
|
|
|
|
declare void @extern_func()
|
|
|
|
define <4 x float> @non_preserved_vgpr_tuple8(<8 x i32> %rsrc, <4 x i32> %samp, float %bias, float %zcompare, float %s, float %t, float %clamp) {
|
|
; The vgpr tuple8 operand in image_gather4_c_b_cl instruction needs not be
|
|
; preserved across the call and should get 8 scratch registers.
|
|
|
|
; GFX9-LABEL: non_preserved_vgpr_tuple8:
|
|
; GFX9: buffer_store_dword v40, off, s[0:3], s32 offset:16 ; 4-byte Folded Spill
|
|
; GFX9: buffer_store_dword v41, off, s[0:3], s33 offset:12 ; 4-byte Folded Spill
|
|
; GFX9-NEXT: buffer_store_dword v42, off, s[0:3], s33 offset:8 ; 4-byte Folded Spill
|
|
; GFX9-NEXT: buffer_store_dword v43, off, s[0:3], s33 offset:4 ; 4-byte Folded Spill
|
|
; GFX9-NEXT: buffer_store_dword v44, off, s[0:3], s33 ; 4-byte Folded Spill
|
|
|
|
; GFX9: v_mov_b32_e32 v36, v16
|
|
; GFX9-NEXT: v_mov_b32_e32 v35, v15
|
|
; GFX9-NEXT: v_mov_b32_e32 v34, v14
|
|
; GFX9-NEXT: v_mov_b32_e32 v33, v13
|
|
; GFX9-NEXT: v_mov_b32_e32 v32, v12
|
|
; GFX9: ;;#ASMSTART
|
|
; GFX9-NEXT: ;;#ASMEND
|
|
; GFX9: image_gather4_c_b_cl v[41:44], v[32:36], s[4:11], s[4:7] dmask:0x1
|
|
; GFX9-NEXT: s_getpc_b64 s[4:5]
|
|
; GFX9-NEXT: s_add_u32 s4, s4, extern_func@gotpcrel32@lo+4
|
|
; GFX9-NEXT: s_addc_u32 s5, s5, extern_func@gotpcrel32@hi+12
|
|
; GFX9-NEXT: s_load_dwordx2 s[4:5], s[4:5], 0x0
|
|
; GFX9-NEXT: v_writelane_b32 v40, s30, 0
|
|
; GFX9: s_waitcnt lgkmcnt(0)
|
|
; GFX9-NEXT: s_swappc_b64 s[30:31], s[4:5]
|
|
|
|
; GFX9: buffer_load_dword v44, off, s[0:3], s33 ; 4-byte Folded Reload
|
|
; GFX9-NEXT: buffer_load_dword v43, off, s[0:3], s33 offset:4 ; 4-byte Folded Reload
|
|
; GFX9-NEXT: buffer_load_dword v42, off, s[0:3], s33 offset:8 ; 4-byte Folded Reload
|
|
; GFX9-NEXT: buffer_load_dword v41, off, s[0:3], s33 offset:12 ; 4-byte Folded Reload
|
|
; GFX9: buffer_load_dword v40, off, s[0:3], s32 offset:16 ; 4-byte Folded Reload
|
|
; GFX9: s_setpc_b64 s[4:5]
|
|
;
|
|
; GFX10-LABEL: non_preserved_vgpr_tuple8:
|
|
; GFX10: buffer_store_dword v40, off, s[0:3], s32 offset:16 ; 4-byte Folded Spill
|
|
; GFX10: buffer_store_dword v41, off, s[0:3], s33 offset:12 ; 4-byte Folded Spill
|
|
; GFX10-NEXT: buffer_store_dword v42, off, s[0:3], s33 offset:8 ; 4-byte Folded Spill
|
|
; GFX10-NEXT: buffer_store_dword v43, off, s[0:3], s33 offset:4 ; 4-byte Folded Spill
|
|
; GFX10-NEXT: buffer_store_dword v44, off, s[0:3], s33 ; 4-byte Folded Spill
|
|
|
|
; GFX10: v_mov_b32_e32 v36, v16
|
|
; GFX10-NEXT: v_mov_b32_e32 v35, v15
|
|
; GFX10-NEXT: v_mov_b32_e32 v34, v14
|
|
; GFX10-NEXT: v_mov_b32_e32 v33, v13
|
|
; GFX10-NEXT: v_mov_b32_e32 v32, v12
|
|
|
|
; GFX10: ;;#ASMSTART
|
|
; GFX10-NEXT: ;;#ASMEND
|
|
|
|
; GFX10: image_gather4_c_b_cl v[41:44], v[32:36], s[4:11], s[4:7] dmask:0x1 dim:SQ_RSRC_IMG_2D
|
|
; GFX10-NEXT: s_waitcnt_depctr 0xffe3
|
|
; GFX10-NEXT: s_getpc_b64 s[4:5]
|
|
; GFX10-NEXT: s_add_u32 s4, s4, extern_func@gotpcrel32@lo+4
|
|
; GFX10-NEXT: s_addc_u32 s5, s5, extern_func@gotpcrel32@hi+12
|
|
; GFX10: s_load_dwordx2 s[4:5], s[4:5], 0x0
|
|
; GFX10: s_waitcnt lgkmcnt(0)
|
|
; GFX10-NEXT: s_swappc_b64 s[30:31], s[4:5]
|
|
|
|
; GFX10: buffer_load_dword v44, off, s[0:3], s33
|
|
; GFX10-NEXT: buffer_load_dword v43, off, s[0:3], s33 offset:4
|
|
; GFX10-NEXT: buffer_load_dword v42, off, s[0:3], s33 offset:8
|
|
; GFX10-NEXT: buffer_load_dword v41, off, s[0:3], s33 offset:12
|
|
|
|
; GFX10: buffer_load_dword v40, off, s[0:3], s32 offset:16 ; 4-byte Folded Reload
|
|
; GFX10: s_setpc_b64 s[4:5]
|
|
main_body:
|
|
call void asm sideeffect "", "~{v0},~{v1},~{v2},~{v3},~{v4},~{v5},~{v6},~{v7}"() #0
|
|
call void asm sideeffect "", "~{v8},~{v9},~{v10},~{v11},~{v12},~{v13},~{v14},~{v15}"() #0
|
|
call void asm sideeffect "", "~{v16},~{v17},~{v18},~{v19},~{v20},~{v21},~{v22},~{v23}"() #0
|
|
call void asm sideeffect "", "~{v24},~{v25},~{v26},~{v27},~{v28},~{v29},~{v30},~{v31}"() #0
|
|
%v = call <4 x float> @llvm.amdgcn.image.gather4.c.b.cl.2d.v4f32.f32.f32(i32 1, float %bias, float %zcompare, float %s, float %t, float %clamp, <8 x i32> undef, <4 x i32> undef, i1 false, i32 0, i32 0)
|
|
call void @extern_func()
|
|
ret <4 x float> %v
|
|
}
|
|
|
|
define <4 x float> @call_preserved_vgpr_tuple8(<8 x i32> %rsrc, <4 x i32> %samp, float %bias, float %zcompare, float %s, float %t, float %clamp) {
|
|
; The vgpr tuple8 operand in image_gather4_c_b_cl instruction needs to be preserved
|
|
; across the call and should get allcoated to 8 CSRs.
|
|
; Only the lower 5 sub-registers of the tuple are preserved.
|
|
; The upper 3 sub-registers are unused.
|
|
|
|
; GFX9-LABEL: call_preserved_vgpr_tuple8:
|
|
; GFX9: buffer_store_dword v40, off, s[0:3], s32 offset:20 ; 4-byte Folded Spill
|
|
; GFX9: buffer_store_dword v41, off, s[0:3], s33 offset:16 ; 4-byte Folded Spill
|
|
; GFX9-NEXT: buffer_store_dword v42, off, s[0:3], s33 offset:12 ; 4-byte Folded Spill
|
|
; GFX9-NEXT: buffer_store_dword v43, off, s[0:3], s33 offset:8 ; 4-byte Folded Spill
|
|
; GFX9-NEXT: buffer_store_dword v44, off, s[0:3], s33 offset:4 ; 4-byte Folded Spill
|
|
; GFX9-NEXT: buffer_store_dword v45, off, s[0:3], s33 ; 4-byte Folded Spill
|
|
|
|
; GFX9: v_mov_b32_e32 v45, v16
|
|
; GFX9-NEXT: v_mov_b32_e32 v44, v15
|
|
; GFX9-NEXT: v_mov_b32_e32 v43, v14
|
|
; GFX9-NEXT: v_mov_b32_e32 v42, v13
|
|
; GFX9-NEXT: v_mov_b32_e32 v41, v12
|
|
|
|
; GFX9: image_gather4_c_b_cl v[0:3], v[41:45], s[36:43], s[4:7] dmask:0x1
|
|
; GFX9-NEXT: s_getpc_b64 s[4:5]
|
|
; GFX9-NEXT: s_add_u32 s4, s4, extern_func@gotpcrel32@lo+4
|
|
; GFX9-NEXT: s_addc_u32 s5, s5, extern_func@gotpcrel32@hi+12
|
|
; GFX9-NEXT: s_load_dwordx2 s[4:5], s[4:5], 0x0
|
|
; GFX9: s_waitcnt vmcnt(0)
|
|
; GFX9-NEXT: global_store_dwordx4 v[0:1], v[0:3], off
|
|
; GFX9-NEXT: s_waitcnt lgkmcnt(0)
|
|
; GFX9-NEXT: s_swappc_b64 s[30:31], s[4:5]
|
|
; GFX9-NEXT: image_gather4_c_b_cl v[0:3], v[41:45], s[36:43], s[4:7] dmask:0x1
|
|
|
|
; GFX9: buffer_load_dword v45, off, s[0:3], s33 ; 4-byte Folded Reload
|
|
; GFX9-NEXT: buffer_load_dword v44, off, s[0:3], s33 offset:4 ; 4-byte Folded Reload
|
|
; GFX9-NEXT: buffer_load_dword v43, off, s[0:3], s33 offset:8 ; 4-byte Folded Reload
|
|
; GFX9-NEXT: buffer_load_dword v42, off, s[0:3], s33 offset:12 ; 4-byte Folded Reload
|
|
; GFX9-NEXT: buffer_load_dword v41, off, s[0:3], s33 offset:16 ; 4-byte Folded Reload
|
|
|
|
; GFX9: buffer_load_dword v40, off, s[0:3], s32 offset:20 ; 4-byte Folded Reload
|
|
; GFX9: s_setpc_b64 s[4:5]
|
|
;
|
|
; GFX10-LABEL: call_preserved_vgpr_tuple8:
|
|
; GFX10: buffer_store_dword v40, off, s[0:3], s32 offset:20 ; 4-byte Folded Spill
|
|
; GFX10: buffer_store_dword v41, off, s[0:3], s33 offset:16 ; 4-byte Folded Spill
|
|
; GFX10-NEXT: buffer_store_dword v42, off, s[0:3], s33 offset:12 ; 4-byte Folded Spill
|
|
; GFX10-NEXT: buffer_store_dword v43, off, s[0:3], s33 offset:8 ; 4-byte Folded Spill
|
|
; GFX10-NEXT: buffer_store_dword v44, off, s[0:3], s33 offset:4 ; 4-byte Folded Spill
|
|
; GFX10-NEXT: buffer_store_dword v45, off, s[0:3], s33 ; 4-byte Folded Spill
|
|
|
|
|
|
; GFX10: image_gather4_c_b_cl v[0:3], v[12:16], s[36:43], s[4:7] dmask:0x1 dim:SQ_RSRC_IMG_2D
|
|
; GFX10-NEXT: s_waitcnt_depctr 0xffe3
|
|
; GFX10-NEXT: s_getpc_b64 s[4:5]
|
|
; GFX10-NEXT: s_add_u32 s4, s4, extern_func@gotpcrel32@lo+4
|
|
; GFX10-NEXT: s_addc_u32 s5, s5, extern_func@gotpcrel32@hi+12
|
|
; GFX10-NEXT: v_mov_b32_e32 v41, v16
|
|
; GFX10-NEXT: s_load_dwordx2 s[4:5], s[4:5], 0x0
|
|
; GFX10-NEXT: v_mov_b32_e32 v42, v15
|
|
; GFX10-NEXT: v_mov_b32_e32 v43, v14
|
|
; GFX10-NEXT: v_mov_b32_e32 v44, v13
|
|
; GFX10-NEXT: v_mov_b32_e32 v45, v12
|
|
; GFX10-NEXT: s_waitcnt vmcnt(0)
|
|
; GFX10-NEXT: global_store_dwordx4 v[0:1], v[0:3], off
|
|
; GFX10-NEXT: s_waitcnt lgkmcnt(0)
|
|
; GFX10-NEXT: s_swappc_b64 s[30:31], s[4:5]
|
|
; GFX10-NEXT: image_gather4_c_b_cl v[0:3], [v45, v44, v43, v42, v41], s[36:43], s[4:7] dmask:0x1 dim:SQ_RSRC_IMG_2D
|
|
|
|
; GFX10: buffer_load_dword v45, off, s[0:3], s33{{$}}
|
|
; GFX10-NEXT: buffer_load_dword v44, off, s[0:3], s33 offset:4
|
|
; GFX10-NEXT: buffer_load_dword v43, off, s[0:3], s33 offset:8
|
|
; GFX10-NEXT: buffer_load_dword v42, off, s[0:3], s33 offset:12
|
|
; GFX10-NEXT: buffer_load_dword v41, off, s[0:3], s33 offset:16
|
|
; GFX10: buffer_load_dword v40, off, s[0:3], s32 offset:20
|
|
; GFX10: s_setpc_b64 s[4:5]
|
|
main_body:
|
|
%v = call <4 x float> @llvm.amdgcn.image.gather4.c.b.cl.2d.v4f32.f32.f32(i32 1, float %bias, float %zcompare, float %s, float %t, float %clamp, <8 x i32> undef, <4 x i32> undef, i1 false, i32 0, i32 0)
|
|
store <4 x float> %v, <4 x float> addrspace(1)* undef
|
|
call void @extern_func()
|
|
%v1 = call <4 x float> @llvm.amdgcn.image.gather4.c.b.cl.2d.v4f32.f32.f32(i32 1, float %bias, float %zcompare, float %s, float %t, float %clamp, <8 x i32> undef, <4 x i32> undef, i1 false, i32 0, i32 0)
|
|
ret <4 x float> %v1
|
|
}
|
|
|
|
declare <4 x float> @llvm.amdgcn.image.gather4.c.b.cl.2d.v4f32.f32.f32(i32 immarg, float, float, float, float, float, <8 x i32>, <4 x i32>, i1 immarg, i32 immarg, i32 immarg) #1
|
|
|
|
attributes #0 = { nounwind writeonly }
|
|
attributes #1 = { nounwind readonly }
|