1 ; RUN: llc -march=hexagon < %s -pipeliner-experimental-cg=true | FileCheck %s
3 ; Test that the instruction ordering code in the pipeliner fixes up dependences
4 ; between post-increment register definitions and uses so that the register
5 ; allocator does not allocate an additional register. The following test case
6 ; should generate a single packet.
8 ; CHECK: loop0(.LBB0_[[LOOP:.]],
9 ; CHECK: .LBB0_[[LOOP]]:
14 define void @test(i64* nocapture %v1, i64 %v2, i32 %len) local_unnamed_addr #0 {
16 %cmp7 = icmp sgt i32 %len, 0
17 br i1 %cmp7, label %for.body, label %for.end
20 %arrayidx.phi = phi i64* [ %arrayidx.inc, %for.body ], [ %v1, %entry ]
21 %i.08 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
22 %0 = load i64, i64* %arrayidx.phi, align 8
23 %1 = tail call i64 @llvm.hexagon.M2.mmpyul.rs1(i64 %0, i64 %v2)
24 store i64 %1, i64* %arrayidx.phi, align 8
25 %inc = add nuw nsw i32 %i.08, 1
26 %exitcond = icmp eq i32 %inc, %len
27 %arrayidx.inc = getelementptr i64, i64* %arrayidx.phi, i32 1
28 br i1 %exitcond, label %for.end, label %for.body
34 declare i64 @llvm.hexagon.M2.mmpyul.rs1(i64, i64) #1
36 attributes #0 = { nounwind "target-cpu"="hexagonv60" }
37 attributes #1 = { nounwind readnone }