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;=========================== begin_copyright_notice ============================
;
; Copyright (C) 2023-2024 Intel Corporation
;
; SPDX-License-Identifier: MIT
;
;============================ end_copyright_notice =============================
; REQUIRES: opaque-ptr-fix, llvm-14-plus
; RUN: igc_opt --opaque-pointers -debugify --igc-gep-loop-strength-reduction -check-debugify -S < %s 2>&1 | FileCheck %s
;
; Kernel is:
;
; kernel void test(global int* p, int n) {
; for (int i = 0; i < n; ++i) {
; p[c*(a+b) + (i + a*b)] = i;
; }
; }
;
; SCEV expresion is (as dumped by object):
;
; ((zext i32 ((%a + %b) * %c) to i64) + (zext i32 {(%a + %b),+,1}<nw><%for.body> to i64))<nuw><nsw>
;
; Since "(a + b)*c" doesn't change value between iterations, expression can be changed to:
;
; { (a + b)*c + (a+b), +, 1 }
;
; Which can be easily reduced.
; Debug-info related check
; CHECK: CheckModuleDebugify: PASS
define spir_kernel void @test(i32 addrspace(1)* %p, i32 %n, i32 %a, i32 %b, i32 %c) {
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: [[ADD1:%.*]] = add i32 %b, %a
; CHECK: [[MUL:%.*]] = mul i32 %c, [[ADD1]]
; CHECK: [[ADD2:%.*]] = add i32 [[ADD1]], [[MUL]]
; CHECK: [[ZEXT:%.*]] = zext i32 [[ADD2]] to i64
; CHECK: [[GEP_PHI1:%.*]] = getelementptr i32, i32 addrspace(1)* %p, i64 [[ZEXT]]
; 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: store i32 %i.02, 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 1
; 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 ]
%add_ab = add nsw i32 %a, %b
%mul_ab = mul i32 %a, %b
%mul_c = mul i32 %c, %add_ab
%add1 = add nsw i32 %i.02, %add_ab
%zext1 = zext i32 %add1 to i64
%zext2 = zext i32 %mul_c to i64
%add2 = add nsw i64 %zext1, %zext2
%arrayidx = getelementptr inbounds i32, i32 addrspace(1)* %p, i64 %add2
store i32 %i.02, 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, i32, i32, i32)* @test, !1}
!1 = !{!2}
!2 = !{!"function_type", i32 0}
|
