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| ; RUN: llc -march=hexagon -O2 < %s | FileCheck %s
; In DAG combiner, eliminate a store in cases where the store is fed by a
; load from the same location. This is already done in cases where the store's
; chain reaches the "output chain" of the load, this tests for cases where
; the load's "input chain" is reached via an intervening node (eg. TokenFactor)
; that ensures ordering.
target triple = "hexagon"
%s.0 = type { [3 x i32] }
; Function Attrs: nounwind
define void @f0(i32 %a0, i32 %a1, %s.0* nocapture %a2, %s.0* nocapture %a3) #0 {
b0:
; Pick one store that happens as a result. This isn't the best, but a regular
; expression for a register name matches some unrelated load.
; CHECK: %bb.
; CHECK: = memw(r3+#8)
; CHECK-NOT: memw(r3+#8) =
; CHECK: %bb.
%v0 = bitcast %s.0* %a2 to i8*
%v1 = bitcast %s.0* %a3 to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 4 %v0, i8* align 4 %v1, i32 12, i1 false)
%v2 = bitcast %s.0* %a2 to i96*
%v3 = zext i32 %a0 to i96
%v4 = load i96, i96* %v2, align 4
%v5 = shl nuw nsw i96 %v3, 48
%v6 = and i96 %v5, 281474976710656
%v7 = and i96 %v4, -281474976710657
%v8 = or i96 %v7, %v6
store i96 %v8, i96* %v2, align 4
%v9 = icmp eq i32 %a1, 2147483647
br i1 %v9, label %b1, label %b2
b1: ; preds = %b0
%v10 = and i96 %v8, -12582913
br label %b3
b2: ; preds = %b0
%v11 = bitcast %s.0* %a3 to i96*
%v12 = load i96, i96* %v11, align 4
%v13 = trunc i96 %v12 to i32
%v14 = add i32 %v13, %a1
%v15 = zext i32 %v14 to i96
%v16 = and i96 %v15, 4194303
%v17 = and i96 %v8, -4194304
%v18 = or i96 %v16, %v17
store i96 %v18, i96* %v2, align 4
%v19 = load i96, i96* %v11, align 4
%v20 = and i96 %v19, 12582912
%v21 = and i96 %v18, -12582913
%v22 = or i96 %v21, %v20
br label %b3
b3: ; preds = %b2, %b1
%v23 = phi i96 [ %v22, %b2 ], [ %v10, %b1 ]
store i96 %v23, i96* %v2, align 4
ret void
}
; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture writeonly, i8* nocapture readonly, i32, i1) #1
attributes #0 = { nounwind }
attributes #1 = { argmemonly nounwind }
|