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;=========================== begin_copyright_notice ============================
;
; Copyright (C) 2024 Intel Corporation
;
; SPDX-License-Identifier: MIT
;
;============================ end_copyright_notice =============================
; REQUIRES: opaque-ptr-fix, llvm-14-plus, regkeys
; RUN: igc_opt --opaque-pointers --regkey=EnableGEPLSRUnknownConstantStep=1 -debugify --igc-gep-loop-strength-reduction -check-debugify -S < %s 2>&1 | FileCheck %s
; Pointer is indexed with an uknown value. As long as the step is constant, we can optimize GEP.
; Debug-info related check
; CHECK: CheckModuleDebugify: PASS
define spir_kernel void @test(i32 addrspace(1)* %p, i32 %n, i64 %step) {
entry:
%cmp1 = icmp slt i32 0, %n
br i1 %cmp1, label %for.body.lr.ph, label %for.end
; CHECK-LABEL: for.body.lr.ph:
; CHECK: [[GEP_PHI1:%.*]] = getelementptr i32, i32 addrspace(1)* %p, i64 0
; CHECK: br label %for.body
for.body.lr.ph: ; preds = %entry
br label %for.body
; CHECK-LABEL: for.body:
; CHECK: [[GEP:%.*]] = phi i32 addrspace(1)* [ [[GEP_PHI1]], %for.body.lr.ph ], [ [[GEP_PHI2:%.*]], %for.body ]
; CHECK: %i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
; CHECK-NOT: getelementptr inbounds i32, i32 addrspace(1)* %p
; CHECK: [[LOAD:%.*]] = load i32, i32 addrspace(1)* [[GEP]], align 4
; CHECK: %add = add nsw i32 [[LOAD]], 1
; CHECK: store i32 %add, i32 addrspace(1)* [[GEP]], align 4
; CHECK: %inc = add nuw nsw i32 %i.02, 1
; CHECK: %cmp = icmp slt i32 %inc, %n
; CHECK: [[GEP_PHI2]] = getelementptr i32, i32 addrspace(1)* [[GEP]], i64 %step
; CHECK: br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
for.body: ; preds = %for.body.lr.ph, %for.body
%i.02 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%idxprom = zext i32 %i.02 to i64
%idxprom2 = mul i64 %idxprom, %step
%arrayidx = getelementptr inbounds i32, i32 addrspace(1)* %p, i64 %idxprom2
%0 = load i32, i32 addrspace(1)* %arrayidx, align 4
%add = add nsw i32 %0, 1
store i32 %add, i32 addrspace(1)* %arrayidx, align 4
%inc = add nuw nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, %n
br i1 %cmp, label %for.body, label %for.cond.for.end_crit_edge
for.cond.for.end_crit_edge: ; preds = %for.body
br label %for.end
for.end: ; preds = %for.cond.for.end_crit_edge, %entry
ret void
}
!igc.functions = !{!0}
!0 = !{void (i32 addrspace(1)*, i32, i64)* @test, !1}
!1 = !{!2}
!2 = !{!"function_type", i32 0}
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