mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-01-31 20:51:52 +01:00
22ba99e3f8
"Divergence driven ISel. Assign register class for cross block values
according to the divergence."
that discovered the design flaw leading to several issues that
required to be solved before.
This change reverts AMDGPU specific changes and keeps common part
unaffected.
llvm-svn: 362749
147 lines
4.0 KiB
LLVM
147 lines
4.0 KiB
LLVM
; RUN: llc -march=amdgcn -mcpu=tahiti -verify-machineinstrs < %s | FileCheck -enable-var-scope -check-prefix=SI %s
|
|
;
|
|
;
|
|
; Most SALU instructions ignore control flow, so we need to make sure
|
|
; they don't overwrite values from other blocks.
|
|
|
|
; If the branch decision is made based on a value in an SGPR then all
|
|
; threads will execute the same code paths, so we don't need to worry
|
|
; about instructions in different blocks overwriting each other.
|
|
; SI-LABEL: {{^}}sgpr_if_else_salu_br:
|
|
; SI: s_add
|
|
; SI: s_branch
|
|
|
|
; SI: s_sub
|
|
|
|
define amdgpu_kernel void @sgpr_if_else_salu_br(i32 addrspace(1)* %out, i32 %a, i32 %b, i32 %c, i32 %d, i32 %e) {
|
|
entry:
|
|
%0 = icmp eq i32 %a, 0
|
|
br i1 %0, label %if, label %else
|
|
|
|
if:
|
|
%1 = sub i32 %b, %c
|
|
br label %endif
|
|
|
|
else:
|
|
%2 = add i32 %d, %e
|
|
br label %endif
|
|
|
|
endif:
|
|
%3 = phi i32 [%1, %if], [%2, %else]
|
|
%4 = add i32 %3, %a
|
|
store i32 %4, i32 addrspace(1)* %out
|
|
ret void
|
|
}
|
|
|
|
; SI-LABEL: {{^}}sgpr_if_else_salu_br_opt:
|
|
; SI: s_cmp_lg_u32
|
|
; SI: s_cbranch_scc0 [[IF:BB[0-9]+_[0-9]+]]
|
|
|
|
; SI: ; %bb.1: ; %else
|
|
; SI: s_load_dword [[LOAD0:s[0-9]+]], s{{\[[0-9]+:[0-9]+\]}}, 0x2e
|
|
; SI: s_load_dword [[LOAD1:s[0-9]+]], s{{\[[0-9]+:[0-9]+\]}}, 0x37
|
|
; SI-NOT: add
|
|
; SI: s_branch [[ENDIF:BB[0-9]+_[0-9]+]]
|
|
|
|
; SI: [[IF]]: ; %if
|
|
; SI: s_load_dword [[LOAD0]], s{{\[[0-9]+:[0-9]+\]}}, 0x1c
|
|
; SI: s_load_dword [[LOAD1]], s{{\[[0-9]+:[0-9]+\]}}, 0x25
|
|
; SI-NOT: add
|
|
|
|
; SI: [[ENDIF]]: ; %endif
|
|
; SI: s_add_i32 s{{[0-9]+}}, [[LOAD0]], [[LOAD1]]
|
|
; SI: buffer_store_dword
|
|
; SI-NEXT: s_endpgm
|
|
define amdgpu_kernel void @sgpr_if_else_salu_br_opt(i32 addrspace(1)* %out, [8 x i32], i32 %a, [8 x i32], i32 %b, [8 x i32], i32 %c, [8 x i32], i32 %d, [8 x i32], i32 %e) {
|
|
entry:
|
|
%cmp0 = icmp eq i32 %a, 0
|
|
br i1 %cmp0, label %if, label %else
|
|
|
|
if:
|
|
%add0 = add i32 %b, %c
|
|
br label %endif
|
|
|
|
else:
|
|
%add1 = add i32 %d, %e
|
|
br label %endif
|
|
|
|
endif:
|
|
%phi = phi i32 [%add0, %if], [%add1, %else]
|
|
%add2 = add i32 %phi, %a
|
|
store i32 %add2, i32 addrspace(1)* %out
|
|
ret void
|
|
}
|
|
|
|
; The two S_ADD instructions should write to different registers, since
|
|
; different threads will take different control flow paths.
|
|
|
|
; SI-LABEL: {{^}}sgpr_if_else_valu_br:
|
|
; SI: s_add_i32 [[SGPR:s[0-9]+]]
|
|
; SI-NOT: s_add_i32 [[SGPR]]
|
|
|
|
define amdgpu_kernel void @sgpr_if_else_valu_br(i32 addrspace(1)* %out, float %a, i32 %b, i32 %c, i32 %d, i32 %e) {
|
|
entry:
|
|
%tid = call i32 @llvm.amdgcn.workitem.id.x() #0
|
|
%tid_f = uitofp i32 %tid to float
|
|
%tmp1 = fcmp ueq float %tid_f, 0.0
|
|
br i1 %tmp1, label %if, label %else
|
|
|
|
if:
|
|
%tmp2 = add i32 %b, %c
|
|
br label %endif
|
|
|
|
else:
|
|
%tmp3 = add i32 %d, %e
|
|
br label %endif
|
|
|
|
endif:
|
|
%tmp4 = phi i32 [%tmp2, %if], [%tmp3, %else]
|
|
store i32 %tmp4, i32 addrspace(1)* %out
|
|
ret void
|
|
}
|
|
|
|
; SI-LABEL: {{^}}sgpr_if_else_valu_cmp_phi_br:
|
|
|
|
; SI: ; %else
|
|
; SI: buffer_load_dword [[AVAL:v[0-9]+]]
|
|
; SI: v_cmp_gt_i32_e64 [[PHI:s\[[0-9]+:[0-9]+\]]], 0, [[AVAL]]
|
|
|
|
; SI: ; %if
|
|
; SI: buffer_load_dword [[AVAL:v[0-9]+]]
|
|
; SI-DAG: v_cmp_eq_u32_e32 [[CMP_ELSE:vcc]], 0, [[AVAL]]
|
|
; SI-DAG: s_andn2_b64 [[PHI]], [[PHI]], exec
|
|
; SI-DAG: s_and_b64 [[TMP:s\[[0-9]+:[0-9]+\]]], [[CMP_ELSE]], exec
|
|
; SI: s_or_b64 [[PHI]], [[PHI]], [[TMP]]
|
|
|
|
; SI: ; %endif
|
|
; SI: v_cndmask_b32_e64 [[RESULT:v[0-9]+]], 0, -1, [[PHI]]
|
|
; SI: buffer_store_dword [[RESULT]],
|
|
define amdgpu_kernel void @sgpr_if_else_valu_cmp_phi_br(i32 addrspace(1)* %out, i32 addrspace(1)* %a, i32 addrspace(1)* %b) {
|
|
entry:
|
|
%tid = call i32 @llvm.amdgcn.workitem.id.x() #0
|
|
%tmp1 = icmp eq i32 %tid, 0
|
|
br i1 %tmp1, label %if, label %else
|
|
|
|
if:
|
|
%gep.if = getelementptr i32, i32 addrspace(1)* %a, i32 %tid
|
|
%a.val = load i32, i32 addrspace(1)* %gep.if
|
|
%cmp.if = icmp eq i32 %a.val, 0
|
|
br label %endif
|
|
|
|
else:
|
|
%gep.else = getelementptr i32, i32 addrspace(1)* %b, i32 %tid
|
|
%b.val = load i32, i32 addrspace(1)* %gep.else
|
|
%cmp.else = icmp slt i32 %b.val, 0
|
|
br label %endif
|
|
|
|
endif:
|
|
%tmp4 = phi i1 [%cmp.if, %if], [%cmp.else, %else]
|
|
%ext = sext i1 %tmp4 to i32
|
|
store i32 %ext, i32 addrspace(1)* %out
|
|
ret void
|
|
}
|
|
|
|
declare i32 @llvm.amdgcn.workitem.id.x() #0
|
|
|
|
attributes #0 = { readnone }
|