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llvm/test/CodeGen/AMDGPU/sibling-call.ll
Alexander Timofeev a12681683a [AMDGPU] Divergence driven instruction selection. Part 1. 
Summary: This change is the first part of the AMDGPU target description
    change. The aim of it is the effective splitting the vector and scalar
    flows at the selection stage. Selection uses predicate functions based
    on the framework implemented earlier - https://reviews.llvm.org/D35267

    Differential revision: https://reviews.llvm.org/D52019

    Reviewers: rampitec

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342719 91177308-0d34-0410-b5e6-96231b3b80d8
2018-09-21 10:31:22 +00:00

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LLVM
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; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=fiji -mattr=-flat-for-global -enable-ipra=0 -amdgpu-sroa=0 -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,VI,CIVI,MESA %s
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=hawaii -enable-ipra=0 -amdgpu-sroa=0 -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,CI,CIVI,MESA %s
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -mattr=-flat-for-global -enable-ipra=0 -amdgpu-sroa=0 -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefixes=GCN,GFX9,MESA %s
target datalayout = "A5"
; FIXME: Why is this commuted only sometimes?
; GCN-LABEL: {{^}}i32_fastcc_i32_i32:
; GCN: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CIVI-NEXT: v_add_{{i|u}}32_e32 v0, vcc, v0, v1
; GFX9-NEXT: v_add_u32_e32 v0, v0, v1
; GCN-NEXT: s_setpc_b64
define fastcc i32 @i32_fastcc_i32_i32(i32 %arg0, i32 %arg1) #1 {
%add0 = add i32 %arg0, %arg1
ret i32 %add0
}
; GCN-LABEL: {{^}}i32_fastcc_i32_i32_stack_object:
; GCN: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; CIVI-NEXT: v_add_{{i|u}}32_e32 v0, vcc, v0, v1
; GFX9-NEXT: v_add_u32_e32 v0, v0, v1
; GCN: s_mov_b32 s5, s32
; GCN: buffer_store_dword v{{[0-9]+}}, off, s[0:3], s5 offset:24
; GCN: s_waitcnt vmcnt(0)
; GCN: s_setpc_b64
; GCN: ; ScratchSize: 68
define fastcc i32 @i32_fastcc_i32_i32_stack_object(i32 %arg0, i32 %arg1) #1 {
%alloca = alloca [16 x i32], align 4, addrspace(5)
%gep = getelementptr inbounds [16 x i32], [16 x i32] addrspace(5)* %alloca, i32 0, i32 5
store volatile i32 9, i32 addrspace(5)* %gep
%add0 = add i32 %arg0, %arg1
ret i32 %add0
}
; GCN-LABEL: {{^}}sibling_call_i32_fastcc_i32_i32:
define fastcc i32 @sibling_call_i32_fastcc_i32_i32(i32 %a, i32 %b, i32 %c) #1 {
entry:
%ret = tail call fastcc i32 @i32_fastcc_i32_i32(i32 %a, i32 %b)
ret i32 %ret
}
; GCN-LABEL: {{^}}sibling_call_i32_fastcc_i32_i32_stack_object:
; GCN: v_mov_b32_e32 [[NINE:v[0-9]+]], 9
; GCN: buffer_store_dword [[NINE]], off, s[0:3], s5 offset:24
; GCN: s_setpc_b64
; GCN: ; ScratchSize: 68
define fastcc i32 @sibling_call_i32_fastcc_i32_i32_stack_object(i32 %a, i32 %b, i32 %c) #1 {
entry:
%alloca = alloca [16 x i32], align 4, addrspace(5)
%gep = getelementptr inbounds [16 x i32], [16 x i32] addrspace(5)* %alloca, i32 0, i32 5
store volatile i32 9, i32 addrspace(5)* %gep
%ret = tail call fastcc i32 @i32_fastcc_i32_i32(i32 %a, i32 %b)
ret i32 %ret
}
; GCN-LABEL: {{^}}sibling_call_i32_fastcc_i32_i32_callee_stack_object:
; GCN: v_mov_b32_e32 [[NINE:v[0-9]+]], 9
; GCN: buffer_store_dword [[NINE]], off, s[0:3], s5 offset:24
; GCN: s_setpc_b64
; GCN: ; ScratchSize: 136
define fastcc i32 @sibling_call_i32_fastcc_i32_i32_callee_stack_object(i32 %a, i32 %b, i32 %c) #1 {
entry:
%alloca = alloca [16 x i32], align 4, addrspace(5)
%gep = getelementptr inbounds [16 x i32], [16 x i32] addrspace(5)* %alloca, i32 0, i32 5
store volatile i32 9, i32 addrspace(5)* %gep
%ret = tail call fastcc i32 @i32_fastcc_i32_i32_stack_object(i32 %a, i32 %b)
ret i32 %ret
}
; GCN-LABEL: {{^}}sibling_call_i32_fastcc_i32_i32_unused_result:
define fastcc void @sibling_call_i32_fastcc_i32_i32_unused_result(i32 %a, i32 %b, i32 %c) #1 {
entry:
%ret = tail call fastcc i32 @i32_fastcc_i32_i32(i32 %a, i32 %b)
ret void
}
; It doesn't make sense to do a tail from a kernel
; GCN-LABEL: {{^}}kernel_call_i32_fastcc_i32_i32_unused_result:
;define amdgpu_kernel void @kernel_call_i32_fastcc_i32_i32_unused_result(i32 %a, i32 %b, i32 %c) #1 {
define amdgpu_kernel void @kernel_call_i32_fastcc_i32_i32_unused_result(i32 %a, i32 %b, i32 %c) #1 {
entry:
%ret = tail call fastcc i32 @i32_fastcc_i32_i32(i32 %a, i32 %b)
ret void
}
; GCN-LABEL: {{^}}i32_fastcc_i32_byval_i32:
; GCN: s_waitcnt
; GCN-NEXT: s_mov_b32 s5, s32
; GCN-NEXT: buffer_load_dword v1, off, s[0:3], s5 offset:4
; GCN-NEXT: s_waitcnt vmcnt(0)
; CIVI-NEXT: v_add_{{i|u}}32_e32 v0, vcc, v0, v1
; GFX9-NEXT: v_add_u32_e32 v0, v0, v1
; GCN-NEXT: s_setpc_b64 s[30:31]
define fastcc i32 @i32_fastcc_i32_byval_i32(i32 %arg0, i32 addrspace(5)* byval align 4 %arg1) #1 {
%arg1.load = load i32, i32 addrspace(5)* %arg1, align 4
%add0 = add i32 %arg0, %arg1.load
ret i32 %add0
}
; Tail call disallowed with byval in parent.
; GCN-LABEL: {{^}}sibling_call_i32_fastcc_i32_byval_i32_byval_parent:
; GCN-NOT: v_writelane_b32 v{{[0-9]+}}, s32
; GCN: buffer_store_dword v{{[0-9]+}}, off, s[0:3], s32 offset:4
; GCN: s_swappc_b64
; GCN-NOT: v_readlane_b32 s32
; GCN: s_setpc_b64
define fastcc i32 @sibling_call_i32_fastcc_i32_byval_i32_byval_parent(i32 %a, i32 addrspace(5)* byval %b.byval, i32 %c) #1 {
entry:
%ret = tail call fastcc i32 @i32_fastcc_i32_byval_i32(i32 %a, i32 addrspace(5)* %b.byval)
ret i32 %ret
}
; Tail call disallowed with byval in parent, not callee.
; GCN-LABEL: {{^}}sibling_call_i32_fastcc_i32_byval_i32:
; GCN-NOT: v0
; GCN-NOT: s32
; GCN: buffer_load_dword v1, off, s[0:3], s4 offset:16
; GCN: s_mov_b32 s5, s32
; GCN: buffer_store_dword v1, off, s[0:3], s5 offset:4
; GCN-NEXT: s_setpc_b64
define fastcc i32 @sibling_call_i32_fastcc_i32_byval_i32(i32 %a, [16 x i32] %large) #1 {
entry:
%ret = tail call fastcc i32 @i32_fastcc_i32_byval_i32(i32 %a, i32 addrspace(5)* inttoptr (i32 16 to i32 addrspace(5)*))
ret i32 %ret
}
; GCN-LABEL: {{^}}i32_fastcc_i32_i32_a32i32:
; GCN: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
; GCN-DAG: buffer_load_dword [[LOAD_0:v[0-9]+]], off, s[0:3], s5 offset:4
; GCN-DAG: buffer_load_dword [[LOAD_1:v[0-9]+]], off, s[0:3], s5 offset:8
; CIVI-NEXT: v_add_{{i|u}}32_e32 v0, vcc, v0, v1
; CIVI: v_add_{{i|u}}32_e32 v0, vcc, v0, [[LOAD_0]]
; CIVI: v_add_{{i|u}}32_e32 v0, vcc, v0, [[LOAD_1]]
; GFX9-NEXT: v_add_u32_e32 v0, v0, v1
; GFX9: v_add_u32_e32 v0, v0, [[LOAD_0]]
; GFX9: v_add_u32_e32 v0, v0, [[LOAD_1]]
; GCN-NEXT: s_setpc_b64
define fastcc i32 @i32_fastcc_i32_i32_a32i32(i32 %arg0, i32 %arg1, [32 x i32] %large) #1 {
%val_firststack = extractvalue [32 x i32] %large, 30
%val_laststack = extractvalue [32 x i32] %large, 31
%add0 = add i32 %arg0, %arg1
%add1 = add i32 %add0, %val_firststack
%add2 = add i32 %add1, %val_laststack
ret i32 %add2
}
; FIXME: Why load and store same location for stack args?
; GCN-LABEL: {{^}}sibling_call_i32_fastcc_i32_i32_a32i32:
; GCN: s_mov_b32 s5, s32
; GCN-DAG: buffer_store_dword v32, off, s[0:3], s5 offset:16 ; 4-byte Folded Spill
; GCN-DAG: buffer_store_dword v33, off, s[0:3], s5 offset:12 ; 4-byte Folded Spill
; GCN-DAG: buffer_load_dword [[LOAD_0:v[0-9]+]], off, s[0:3], s5 offset:4
; GCN-DAG: buffer_load_dword [[LOAD_1:v[0-9]+]], off, s[0:3], s5 offset:8
; GCN-NOT: s32
; GCN-DAG: buffer_store_dword [[LOAD_0]], off, s[0:3], s5 offset:4
; GCN-DAG: buffer_store_dword [[LOAD_1]], off, s[0:3], s5 offset:8
; GCN-DAG: buffer_load_dword v32, off, s[0:3], s5 offset:16 ; 4-byte Folded Reload
; GCN-DAG: buffer_load_dword v33, off, s[0:3], s5 offset:12 ; 4-byte Folded Reload
; GCN-NOT: s32
; GCN: s_setpc_b64
define fastcc i32 @sibling_call_i32_fastcc_i32_i32_a32i32(i32 %a, i32 %b, [32 x i32] %c) #1 {
entry:
%ret = tail call fastcc i32 @i32_fastcc_i32_i32_a32i32(i32 %a, i32 %b, [32 x i32] %c)
ret i32 %ret
}
; GCN-LABEL: {{^}}sibling_call_i32_fastcc_i32_i32_a32i32_stack_object:
; GCN-DAG: s_mov_b32 s5, s32
; GCN-NOT: s32
; GCN-DAG: v_mov_b32_e32 [[NINE:v[0-9]+]], 9
; GCN: buffer_store_dword [[NINE]], off, s[0:3], s5 offset:44
; GCN-NOT: s32
; GCN: s_setpc_b64
define fastcc i32 @sibling_call_i32_fastcc_i32_i32_a32i32_stack_object(i32 %a, i32 %b, [32 x i32] %c) #1 {
entry:
%alloca = alloca [16 x i32], align 4, addrspace(5)
%gep = getelementptr inbounds [16 x i32], [16 x i32] addrspace(5)* %alloca, i32 0, i32 5
store volatile i32 9, i32 addrspace(5)* %gep
%ret = tail call fastcc i32 @i32_fastcc_i32_i32_a32i32(i32 %a, i32 %b, [32 x i32] %c)
ret i32 %ret
}
; If the callee requires more stack argument space than the caller,
; don't do a tail call.
; TODO: Do we really need this restriction?
; GCN-LABEL: {{^}}no_sibling_call_callee_more_stack_space:
; GCN: s_swappc_b64
; GCN: s_setpc_b64
define fastcc i32 @no_sibling_call_callee_more_stack_space(i32 %a, i32 %b) #1 {
entry:
%ret = tail call fastcc i32 @i32_fastcc_i32_i32_a32i32(i32 %a, i32 %b, [32 x i32] zeroinitializer)
ret i32 %ret
}
; Have another non-tail in the function
; GCN-LABEL: {{^}}sibling_call_i32_fastcc_i32_i32_other_call:
; GCN: s_mov_b32 s5, s32
; GCN: buffer_store_dword v34, off, s[0:3], s5 offset:12
; GCN: buffer_store_dword v32, off, s[0:3], s5 offset:8 ; 4-byte Folded Spill
; GCN: buffer_store_dword v33, off, s[0:3], s5 offset:4 ; 4-byte Folded Spill
; GCN-DAG: v_writelane_b32 v34, s33, 0
; GCN-DAG: v_writelane_b32 v34, s34, 1
; GCN-DAG: v_writelane_b32 v34, s35, 2
; GCN-DAG: s_add_u32 s32, s32, 0x400
; GCN-DAG: s_getpc_b64
; GCN: s_swappc_b64
; GCN: s_getpc_b64 s[6:7]
; GCN: s_add_u32 s6, s6, sibling_call_i32_fastcc_i32_i32@rel32@lo+4
; GCN: s_addc_u32 s7, s7, sibling_call_i32_fastcc_i32_i32@rel32@hi+4
; GCN-DAG: v_readlane_b32 s33, v34, 0
; GCN-DAG: v_readlane_b32 s34, v34, 1
; GCN-DAG: v_readlane_b32 s35, v34, 2
; GCN: buffer_load_dword v33, off, s[0:3], s5 offset:4
; GCN: buffer_load_dword v32, off, s[0:3], s5 offset:8
; GCN: buffer_load_dword v34, off, s[0:3], s5 offset:12
; GCN: s_sub_u32 s32, s32, 0x400
; GCN: s_setpc_b64 s[6:7]
define fastcc i32 @sibling_call_i32_fastcc_i32_i32_other_call(i32 %a, i32 %b, i32 %c) #1 {
entry:
%other.call = tail call fastcc i32 @i32_fastcc_i32_i32(i32 %a, i32 %b)
%ret = tail call fastcc i32 @sibling_call_i32_fastcc_i32_i32(i32 %a, i32 %b, i32 %other.call)
ret i32 %ret
}
; Have stack object in caller and stack passed arguments. SP should be
; in same place at function exit.
; GCN-LABEL: {{^}}sibling_call_stack_objecti32_fastcc_i32_i32_a32i32:
; GCN: s_mov_b32 s5, s32
; GCN-NOT: s32
; GCN: s_setpc_b64 s[6:7]
define fastcc i32 @sibling_call_stack_objecti32_fastcc_i32_i32_a32i32(i32 %a, i32 %b, [32 x i32] %c) #1 {
entry:
%alloca = alloca [16 x i32], align 4, addrspace(5)
%gep = getelementptr inbounds [16 x i32], [16 x i32] addrspace(5)* %alloca, i32 0, i32 5
store volatile i32 9, i32 addrspace(5)* %gep
%ret = tail call fastcc i32 @i32_fastcc_i32_i32_a32i32(i32 %a, i32 %b, [32 x i32] %c)
ret i32 %ret
}
; GCN-LABEL: {{^}}sibling_call_stack_objecti32_fastcc_i32_i32_a32i32_larger_arg_area:
; GCN: s_mov_b32 s5, s32
; GCN-NOT: s32
; GCN: s_setpc_b64 s[6:7]
define fastcc i32 @sibling_call_stack_objecti32_fastcc_i32_i32_a32i32_larger_arg_area(i32 %a, i32 %b, [36 x i32] %c) #1 {
entry:
%alloca = alloca [16 x i32], align 4, addrspace(5)
%gep = getelementptr inbounds [16 x i32], [16 x i32] addrspace(5)* %alloca, i32 0, i32 5
store volatile i32 9, i32 addrspace(5)* %gep
%ret = tail call fastcc i32 @i32_fastcc_i32_i32_a32i32(i32 %a, i32 %b, [32 x i32] zeroinitializer)
ret i32 %ret
}
attributes #0 = { nounwind }
attributes #1 = { nounwind noinline }
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