faa2c678aa
In order to enable the LLVM frontend to better analyze buffer operations (and to potentially enable more precise analyses on the backend), define versions of the raw and structured buffer intrinsics that use `ptr addrspace(8)` instead of `<4 x i32>` to represent their rsrc arguments. The new intrinsics are named by replacing `buffer.` with `buffer.ptr`. One advantage to these intrinsic definitions is that, instead of specifying that a buffer load/store will read/write some memory, we can indicate that the memory read or written will be based on the pointer argument. This means that, for example, a read from a `noalias` buffer can be pulled out of a loop that is modifying a distinct buffer. In the future, we will define custom PseudoSourceValues that will allow us to package up the (buffer, index, offset) triples that buffer intrinsics contain and allow for more precise backend analysis. This work also enables creating address space 7, which represents manipulation of raw buffers using native LLVM load and store instructions. Where tests simply used a buffer intrinsic while testing some other code path (such as the tests for VGPR spills), they have been updated to use the new intrinsic form. Tests that are "about" buffer intrinsics (for instance, those that ensure that they codegen as expected) have been duplicated, either within existing files or into new ones. Depends on D145441 Reviewed By: arsenm, #amdgpu Differential Revision: https://reviews.llvm.org/D147547
115 lines
5.3 KiB
LLVM
115 lines
5.3 KiB
LLVM
;RUN: llc < %s -march=amdgcn -mcpu=verde -verify-machineinstrs | FileCheck -check-prefix=VERDE %s
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;RUN: llc < %s -march=amdgcn -mcpu=tonga -verify-machineinstrs | FileCheck %s
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;CHECK-LABEL: {{^}}buffer_store:
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_xyzw v[0:3], {{v[0-9]+}}, s[0:3], 0 idxen
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;CHECK: buffer_store_format_xyzw v[4:7], {{v[0-9]+}}, s[0:3], 0 idxen glc
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;CHECK: buffer_store_format_xyzw v[8:11], {{v[0-9]+}}, s[0:3], 0 idxen slc
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define amdgpu_ps void @buffer_store(ptr addrspace(8) inreg, <4 x float>, <4 x float>, <4 x float>) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %1, ptr addrspace(8) %0, i32 0, i32 0, i32 0, i32 0)
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %2, ptr addrspace(8) %0, i32 0, i32 0, i32 0, i32 1)
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %3, ptr addrspace(8) %0, i32 0, i32 0, i32 0, i32 2)
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ret void
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}
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;CHECK-LABEL: {{^}}buffer_store_immoffs:
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_xyzw v[0:3], {{v[0-9]+}}, s[0:3], 0 idxen offset:42
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define amdgpu_ps void @buffer_store_immoffs(ptr addrspace(8) inreg, <4 x float>) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %1, ptr addrspace(8) %0, i32 0, i32 42, i32 0, i32 0)
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ret void
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}
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;CHECK-LABEL: {{^}}buffer_store_idx:
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_xyzw v[0:3], v4, s[0:3], 0 idxen
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define amdgpu_ps void @buffer_store_idx(ptr addrspace(8) inreg, <4 x float>, i32) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %1, ptr addrspace(8) %0, i32 %2, i32 0, i32 0, i32 0)
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ret void
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}
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;CHECK-LABEL: {{^}}buffer_store_ofs:
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_xyzw v[0:3], v[4:5], s[0:3], 0 idxen offen
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define amdgpu_ps void @buffer_store_ofs(ptr addrspace(8) inreg, <4 x float>, i32) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %1, ptr addrspace(8) %0, i32 0, i32 %2, i32 0, i32 0)
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ret void
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}
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;CHECK-LABEL: {{^}}buffer_store_both:
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_xyzw v[0:3], v[4:5], s[0:3], 0 idxen offen
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define amdgpu_ps void @buffer_store_both(ptr addrspace(8) inreg, <4 x float>, i32, i32) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %1, ptr addrspace(8) %0, i32 %2, i32 %3, i32 0, i32 0)
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ret void
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}
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;CHECK-LABEL: {{^}}buffer_store_both_reversed:
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;CHECK: v_mov_b32_e32 v6, v4
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_xyzw v[0:3], v[5:6], s[0:3], 0 idxen offen
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define amdgpu_ps void @buffer_store_both_reversed(ptr addrspace(8) inreg, <4 x float>, i32, i32) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %1, ptr addrspace(8) %0, i32 %3, i32 %2, i32 0, i32 0)
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ret void
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}
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; Ideally, the register allocator would avoid the wait here
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;
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;CHECK-LABEL: {{^}}buffer_store_wait:
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_xyzw v[0:3], v4, s[0:3], 0 idxen
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;VERDE: s_waitcnt expcnt(0)
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;CHECK: buffer_load_format_xyzw v[0:3], v5, s[0:3], 0 idxen
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;CHECK: s_waitcnt vmcnt(0)
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;CHECK: buffer_store_format_xyzw v[0:3], v6, s[0:3], 0 idxen
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define amdgpu_ps void @buffer_store_wait(ptr addrspace(8) inreg, <4 x float>, i32, i32, i32) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %1, ptr addrspace(8) %0, i32 %2, i32 0, i32 0, i32 0)
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%data = call <4 x float> @llvm.amdgcn.struct.ptr.buffer.load.format.v4f32(ptr addrspace(8) %0, i32 %3, i32 0, i32 0, i32 0)
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float> %data, ptr addrspace(8) %0, i32 %4, i32 0, i32 0, i32 0)
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ret void
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}
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;CHECK-LABEL: {{^}}buffer_store_x1:
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_x v0, v1, s[0:3], 0 idxen
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define amdgpu_ps void @buffer_store_x1(ptr addrspace(8) inreg %rsrc, float %data, i32 %index) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.f32(float %data, ptr addrspace(8) %rsrc, i32 %index, i32 0, i32 0, i32 0)
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ret void
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}
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;CHECK-LABEL: {{^}}buffer_store_x1_i32:
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_x v0, v1, s[0:3], 0 idxen
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define amdgpu_ps void @buffer_store_x1_i32(ptr addrspace(8) inreg %rsrc, i32 %data, i32 %index) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.i32(i32 %data, ptr addrspace(8) %rsrc, i32 %index, i32 0, i32 0, i32 0)
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ret void
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}
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;CHECK-LABEL: {{^}}buffer_store_x2:
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;CHECK-NOT: s_waitcnt
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;CHECK: buffer_store_format_xy v[0:1], v2, s[0:3], 0 idxen
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define amdgpu_ps void @buffer_store_x2(ptr addrspace(8) inreg %rsrc, <2 x float> %data, i32 %index) {
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main_body:
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call void @llvm.amdgcn.struct.ptr.buffer.store.format.v2f32(<2 x float> %data, ptr addrspace(8) %rsrc, i32 %index, i32 0, i32 0, i32 0)
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ret void
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}
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declare void @llvm.amdgcn.struct.ptr.buffer.store.format.f32(float, ptr addrspace(8), i32, i32, i32, i32) #0
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declare void @llvm.amdgcn.struct.ptr.buffer.store.format.v2f32(<2 x float>, ptr addrspace(8), i32, i32, i32, i32) #0
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declare void @llvm.amdgcn.struct.ptr.buffer.store.format.v4f32(<4 x float>, ptr addrspace(8), i32, i32, i32, i32) #0
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declare void @llvm.amdgcn.struct.ptr.buffer.store.format.i32(i32, ptr addrspace(8), i32, i32, i32, i32) #0
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declare <4 x float> @llvm.amdgcn.struct.ptr.buffer.load.format.v4f32(ptr addrspace(8), i32, i32, i32, i32) #1
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readonly }
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